TW202000337A - Mold molding apparatus, mold quality evaluation apparatus, and mold quality evaluation method - Google Patents

Abstract

To provide a mold molding apparatus, a mold quality evaluation apparatus, and a mold quality evaluation method whereby the quality of a molded green sand mold can be evaluated without measuring the green sand mold with a mold strength tester each time a green sand mold is molded. The present invention is characterized by being provided with: a green sand mold molding sensor for measuring the pressure value applied to a joined portion of a squeeze board or squeeze foot and green sand placed in a mold molding space during molding of a green sand mold, and a mold quality evaluation apparatus for evaluating the quality of a molded green sand mold from the pressure value.

Description

Mold molding device, mold quality evaluation device, and mold quality evaluation method

The present invention relates to a mold molding device, a mold quality evaluation device, and a mold quality evaluation method for evaluating the quality of a molded wet sand mold.

One of the indexes evaluated for the required quality of the wet sand mold (mold) molded by the mold molding device is mold strength. Generally, in order to determine whether the molded wet sand mold has sufficient mold strength, an operation of measuring the molded wet sand mold one by one using a mold strength meter is required, so a method is expected, and the molded body can be confirmed even without such an operation Whether the wet sand mold has sufficient mold strength. Furthermore, a method is desired that manages the mold quality for each wet sand mold that is molded without stopping the step.

For example, Patent Literature 1 discloses a method for detecting abnormalities in foundry sand blowing and filling in a blow-in type molding machine that measures internal pressure with a pressure sensor in order to detect abnormalities in foundry blowing and filling.

In addition, Patent Document 2 discloses a molding device monitoring system that monitors the parting surface of a mold by using a position sensor that measures the positions of the frame cylinder, the frame cylinder, and the leveling frame. Height, and found a bad mold.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent No. 3415497

Patent Document 2: Japanese Patent No. 3729197

However, in the method for detecting abnormal filling of foundry sand blown in Patent Document 1, only defective sand filling can be detected, and it is difficult to confirm the correct mold strength. Moreover, in the monitoring system of the molding device of Patent Document 2, even if the height of the parting surface of the casting mold is monitored, it is difficult to confirm the correct mold strength according to the height of the parting surface.

The present invention has been completed in view of the above, and an object of the present invention is to provide a mold molding apparatus that can evaluate the quality of the molded wet sand mold without using a mold strength meter to measure the wet sand mold each time one frame of wet sand mold is molded. Mold quality evaluation device and mold quality evaluation method.

In order to solve the above-mentioned problems and achieve the objective, the mold-molding device of the present invention is characterized by having a wet-sand mold-forming sensor, which, when the wet-sand mold is molded, is equipped with a wet-sand mold placed in the mold-molding space The pressure value applied to the contact portion between the sand and the squeeze plate or the squeeze foot is measured; and a mold quality evaluation device that evaluates the quality of the molded wet sand mold from the pressure value.

Moreover, one embodiment of the present invention is characterized in that the mold quality evaluation device includes a mold strength calculation unit that selects from the pressure value based on the relationship between the pressure value and the mold strength of the wet sand mold with the pressure value measured. Calculate the mold strength of the wet sand mold.

In addition, one embodiment of the present invention is characterized in that the mold quality evaluation device includes a mold quality judgment unit that judges the quality of the molded wet sand mold based on a predetermined threshold from the calculated mold strength.

Furthermore, one embodiment of the present invention is characterized in that the mold strength calculation unit calculates the mold strength of the wet sand mold for which the mold strength is not measured.

Furthermore, one embodiment of the present invention is characterized in that the mold quality evaluation device further includes display means for displaying the pressure value calculated by the mold strength calculation unit and the mold of the wet sand mold with the pressure value measured Strength relationship.

Moreover, one embodiment of the present invention is characterized in that the mold quality evaluation device further includes a recording means that records pressure value data generated during the molding of the wet sand mold, mold strength data related to the pressure value, and mold strength The calculation result and the judgment result of the mold quality.

In addition, one embodiment of the present invention is characterized in that the transmission of the pressure value from the wet sand mold modeling sensor to the mold quality evaluation device is performed by wireless communication.

In addition, one embodiment of the present invention is characterized in that the above-mentioned mold molding apparatus is a frameless molding machine or a framed molding machine.

Furthermore, one embodiment of the present invention is characterized in that the pressing plate is formed in a rectangular shape, the arrangement of the pressing legs is formed in a rectangular shape, and a plurality of the wet sand mold modeling sensors are provided. The pressure sensor is embedded in the four corners or the four corners of the pressing plate.

In addition, the mold quality evaluation device of the present invention is characterized in that, during the molding of the wet sand mold, the pressure applied from the contact portion of the wet sand mold sand placed in the mold molding space with the squeeze plate or the squeeze foot The value evaluates the quality of the molded wet sand mold.

Moreover, one embodiment of the present invention is characterized in that the mold quality evaluation device includes a mold strength calculation unit that selects from the pressure value based on the relationship between the pressure value and the mold strength of the wet sand mold with the pressure value measured. Calculate the mold strength of the wet sand mold.

In addition, one embodiment of the present invention is characterized in that the mold quality evaluation device includes a mold quality judgment unit that judges the quality of the molded wet sand mold based on a predetermined threshold from the calculated mold strength.

In addition, the method for evaluating the quality of a casting mold of the present invention is characterized in that it includes, during the molding of a wet sand mold, the contact portion between the wet sand mold sand and the squeeze plate or the squeeze foot placed in the mold molding space The applied pressure value is measured; and the quality of the molded wet sand mold is evaluated from the above pressure value.

In addition, an embodiment of the present invention is characterized in that the evaluation of the quality of the wet sand mold includes the relationship between the pressure value and the mold strength of the wet sand mold with the pressure value measured from the pressure value. Calculate the mold strength of the wet sand mold.

In addition, an embodiment of the present invention is characterized in that the evaluation of the quality of the wet sand mold includes the determination of the quality of the molded wet sand mold based on a predetermined threshold value from the calculated mold strength.

According to the present invention, there is an effect that the mold strength of the molded wet sand mold can be calculated individually without measuring with a mold strength meter, and the quality of the wet sand mold can be evaluated.

1‧‧‧Molding moulding device (framed moulding)

2‧‧‧plate

2a‧‧‧Central plate

2b‧‧‧Outer plate

3‧‧‧ model

3a‧‧‧Location

4‧‧‧ vehicle

5‧‧‧Metal frame

6‧‧‧ Dress frame

7‧‧‧Extrusion head

8‧‧‧Extrusion board

9‧‧‧platform

10A~10L‧‧‧wet sand mold modeling sensor

11‧‧‧Wiring

12‧‧‧ Mold quality evaluation device

13‧‧‧Padding

14‧‧‧bolt

15, 15'‧‧‧Reception Department

16, 16'‧‧‧Enlargement

17‧‧‧ Input

18‧‧‧ Mold strength calculation department

19‧‧‧Mold Quality Judgment Department

20‧‧‧Display

21‧‧‧Department

22‧‧‧Recording Department

23‧‧‧Warning light

24‧‧‧ Pressure value sending department

25‧‧‧Amplifier integrated recorder

26‧‧‧PC

27‧‧‧ Shutter hopper

28‧‧‧ Shutter

29‧‧‧Molding molding machine (frameless molding machine)

30‧‧‧ round trip trolley

31‧‧‧frame

32‧‧‧lower frame

33‧‧‧Upper extrusion plate

34‧‧‧ Lower extrusion plate

35‧‧‧wet sand mold sand blowing inlet

36‧‧‧Sand trough

300, 300a~300e‧‧‧squeeze foot

Around S1, S2‧‧‧

S3‧‧‧Central Department

FIG. 1 is a schematic diagram showing the structure of a mold-molding apparatus according to the first embodiment.

Fig. 2 is a diagram showing the configuration of a part for evaluating the quality of a mold in a mold-molding device.

FIG. 3 is a cross-sectional view showing the details of the part of the extrusion plate in which the wet sand mold modeling sensor is embedded.

FIG. 4 is a cross-sectional view showing the details of the part of the extrusion plate in which the wet sand mold modeling sensor is embedded.

5 is a block diagram showing an example of the functional configuration of a mold quality evaluation device.

6 is a block diagram showing another example of the functional configuration of a mold quality evaluation device.

Fig. 7 is a schematic diagram showing the structure of the experiment conducted this time, (a) is a cross-sectional view, and (b) is a plan view of an extruded plate.

FIG. 8 is a graph showing an example of the results of recording the time-dependent changes in the pressure of the wet sand mold forming sensor in the extrusion step in the amplifier-integrated recorder and analyzing them with a personal computer.

Figure 9 is a graph summarizing the relationship between the peak pressure of the wet sand mold modeling sensor and the strength of the mold.

10 is a diagram showing an example of a screen displayed on the display unit.

11 is a diagram showing an example of a screen displayed on the display unit.

12 is a diagram showing an example of a screen displayed on the display unit.

13(a) to (c) are diagrams showing the steps of a mold quality evaluation method (wet sand mold molding method) using the mold molding apparatus of the first embodiment.

Fig. 14 is a diagram showing another example of an extrusion plate in which a wet sand mold modeling sensor is embedded.

15 is a diagram showing another example of an extruded plate in which a wet sand mold modeling sensor is embedded.

Fig. 16 is a schematic diagram showing the structure of a mold-molding apparatus according to a second embodiment.

FIG. 17 is a diagram showing the configuration of a part for evaluating the quality of a mold in a mold molding device.

18(a) to (d) are diagrams showing the steps of a method for evaluating mold quality (molding method of wet sand mold) using the mold molding apparatus of the second embodiment.

Fig. 19 is a diagram showing another example of an extrusion plate in which a wet sand mold modeling sensor is embedded.

Fig. 20 is a diagram showing another example of an extruded plate in which a wet sand mold modeling sensor is embedded.

21(a) and (b) are diagrams showing the outline of the structure of the mold-molding device of the third embodiment.

Hereinafter, with reference to the accompanying drawings, a description will be given of the form of the mold molding apparatus, mold quality evaluation apparatus, and mold quality evaluation method of the present invention.

(First embodiment)

The first embodiment will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the structure of the mold-molding device of the first embodiment, and FIG. 2 is a diagram showing the configuration of a part of the mold-molding device that evaluates the quality of the mold. The casting mold molding apparatus of this embodiment is a frame molding machine with the next step after molding the wet sand mold (casting mold) while keeping the wet sand mold in the casting frame (metal frame).

The mold molding device 1 is equipped with a plate 2 with a model 3 mounted on the upper surface, a carrier 4, a metal frame 5, a holding frame 6, an extrusion head 7, an extrusion plate 8, a platform 9, and a wet sand molding sensor 10A, 10B, 10C, 10D, wiring 11, and mold quality evaluation device 12. In addition, FIG. 2 shows a case where the wet sand mold modeling sensors 10A, 10B, 10C, and 10D of the extrusion plate 8 are viewed from line A-A of FIG. 1. (Line A-A of Figure 1)

The plate 2 is an upper mold (or lower mold) model 3 used to mold the shape of the casting into a wet sand mold on the upper surface of the plate. The plate 2 is made of aluminum, for example. The carrier 4 is formed into a frame shape, and the plate material 2 is placed inside the frame. Then, the wet sand mold sand for molding the wet sand mold is filled into the mold molding space surrounded by the plate 2, the metal frame 5, the holding frame 6, and the extrusion plate 8. The extruded plate 8 has a rectangular shape, and is a member that forms a part of the boundary of the molding space formed by the division with the metal frame 5 when the mold molding apparatus 1 performs the wet sand mold molding.

The filling of the wet sand mold sand by the casting mold molding device 1 may use a gravity drop method using the weight of the wet sand mold sand, or a blowing method using an air flow. The gravity drop method is a method of filling wet mold sand in the mold molding space by the wet sand mold sand stored in the shutter hopper (not shown) arranged above the mold molding device 1 by gravity . In addition, the air blowing method is a method of filling wet sand mold sand by blowing wet sand mold sand in a sand tank (not shown) into the mold molding space.

Here, the procedure of putting the wet sand molding sand into the molding space of the mold and compressing it will be briefly described. First, the metal frame 5 is placed on the carrier 4, and then, the container frame 6 is superimposed on the metal frame 5 to form a molding space. Next, the wet sand mold sand is put into the molding space, and the squeeze plate 8 compresses (extrudes) the wet sand mold sand. By this, the wet sand mold sand of the casting mold molding space is compacted to form the wet sand mold.

(Wet sand mold modeling sensor)

When the wet sand mold is molded, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D measure the pressure value (peak pressure) of the wet sand mold sand and the pressing surface of the squeeze plate 8 applied in the mold molding space. Determination. Wet sand mold modeling sensors 10A, 10B, 10C, and 10D are pressure sensors. In this embodiment, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are embedded in the four corners of the extrusion plate 8. The reason why the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are buried in this way will be considered as a result of uneven pressure applied to the pressing surface of the pressing plate 8. By embedding the wet sand mold modeling sensors 10A, 10B, 10C, and 10D in the four corners of the extrusion plate 8, the strength distribution of the entire mold can be observed.

In addition, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are pressure-receiving surfaces for measuring pressure, which are exposed on the pressing surface of the pressing plate 8, and the pressure applied to the pressing surface of the wet sand mold and the pressing plate 8 is measured. Value (peak pressure). At this time, it is desirable that the pressure-receiving surfaces of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D and the pressing surface of the pressing plate 8 are in the same plane state and have no step difference. With this, accurate pressure can be measured. In one example, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are fluid pressure sensors. As the wet sand mold modeling sensors 10A, 10B, 10C, and 10D, earth pressure sensors may also be used.

In addition, the wet sand mold shape sensors 10A, 10B, 10C, and 10D take into consideration the size of the embedded extruded plate 8 and the shape of the model 3, and further consider the measurement using a mold strength meter as follows, The mold strength of the wet sand mold formed at the position of the plate 2 is the position of the squeeze plate 8 that measures the pressure to the wet sand mold modeling sensors 10A, 10B, 10C, 10D, and uses the pressure value (Peak pressure) In the case of the relationship between the strength of the mold and the strength of the mold, when the size of the pressure receiving surface is small, the position of the mold strength measurement of the opposing wet sand mold is easy to match the position where the pressure is measured. On the other hand, since the measurement accuracy is also required, the size of the pressure receiving surface is ideally about 5 to 30 mm in diameter.

3 and 4 are detailed side cross-sectional views showing a portion of the pressing plate 8 in which the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are embedded. FIG. 3 shows a case where the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are screw-in type. As shown in FIG. 3, a male thread is formed at the a of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D, and a female thread is formed at the b of the extrusion plate 8, forming the wet sand mold modeling sensor 10A, 10B, 10C, and 10D are screwed to the extrusion plate 8.

On the other hand, FIG. 4 shows a case where the wet sand mold shape sensors 10A, 10B, 10C, and 10D are in the shape of a disk. As shown in FIG. 4, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are placed in the holes of the extrusion plate 8, and the ring-shaped gasket 13 surrounds the wet sand mold modeling sensors 10A, 10B, 10C, 10D outer edge. Moreover, the bolt 14 fixes the gasket 13 and holds the wet sand mold shape sensors 10A, 10B, 10C, and 10D.

In this way, for the wet sand mold modeling sensors 10A, 10B, 10C, and 10D, either screw-in or disc-shaped specifications can be used. In the selection, only the wet sand mold modeling sensors should be considered Just bury it in the space and install it.

The wiring 11 connects the wet sand mold modeling sensors 10A, 10B, 10C, and 10D to the mold quality evaluation device 12. In the present embodiment, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D and the mold quality evaluation device 12 are connected by wire (wired communication) via the wiring 11, but they may be connected wirelessly (wireless communication). For example, the pressure values (pressure value data) detected by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D can be amplified using an amplifier, for example, using a wireless local area network (LAN, Local Area Network), Bluetooth (registered) Wireless communication such as trademark) is sent from the transmitter to the mold quality evaluation device 12.

(Mold Quality Evaluation Device)

The mold quality evaluation apparatus 12 evaluates the quality of the wet sand mold molded by the mold molding apparatus 1 from the pressure values (pressure value data) measured by the wet sand mold molding sensors 10A, 10B, 10C, and 10D. FIG. 5 is a block diagram showing the functional configuration of the mold quality evaluation device 12 for wired communication data. The mold quality evaluation device 12 includes a receiving unit 15, an amplifying unit 16, an input unit 17, a mold strength calculating unit 18, a mold quality determining unit 19, a display unit 20, a transmitting unit 21, and a recording unit 22.

The receiving unit 15 receives the pressure values (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D. In this example, the wired data from the wiring 11 is received.

The amplifier 16 amplifies the signal amount of the received pressure value (pressure value data). The amplifier 16 is, for example, an amplifier.

The input unit 17 inputs the mold strength measured by the mold strength meter on the molded wet sand mold, the value of the slope "a" and the intercept "b" of the following formula y=ax+b, and the molded wet sand The threshold value of the strength of the mold. Furthermore, the input is performed by the operator. The input unit 17 is, for example, a keyboard or a touch panel. Furthermore, "y" of the formula y=ax+b is the mold strength, and "x" is the pressure value measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D. This formula is based on the input slope " a”, the intercept “b” and the measured value “x” to find the relational expression of the mold strength “y”.

The mold strength calculation unit 18 is the pressure value (peak pressure) measured by the slope "a", the intercept "b" input to the input unit 17 and the wet sand mold modeling sensors 10A, 10B, 10C, and 10D. The mold strength is calculated for each pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D from the relationship between the measured value and the mold strength. In addition, the method of calculating the strength of the mold will be described in detail later. The mold strength calculation unit 18 is, for example, a computer or a PLC (Programmable Logic Controller).

The mold quality determination unit 19 determines the quality of the molded wet sand mold from the threshold value of the mold strength input to the input unit 17 and the calculated mold strength. In addition, the method of determining the quality of the mold will be described in detail later. The mold quality determination unit 19 is, for example, a computer or PLC.

The display unit 20 displays the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D, and the mold strength and pressure value (peak pressure) input by the operator using the input unit 17 The value of the slope "a" and intercept "b" of the relationship y=ax+b, the threshold value of the mold strength of the wet sand mold input by the operator, the calculation result of the mold strength, and the mold quality Judgment results, etc. The display unit 20 is, for example, a display such as liquid crystal.

The transmission unit 21 transmits the NG judgment data to the warning light (PATLITE: registered trademark) 23 and the like. Either wired or wireless data can be sent. Then, an operator who confirms the flashing warning light 23 and the like and recognizes that the wet sand mold is defective is marked with an X symbol on the corresponding wet sand mold, and it is recognized as a defective product at a glance. The wet sand mold identified as a defective product is not subjected to subsequent steps (pouring), and these steps are omitted and the mold is finally removed.

The recording unit 22 records pressure value data, mold strength data related to the pressure value, mold strength calculation results, mold quality judgment results, and the like. Furthermore, these materials are recorded for each model attached to the plate 2. The recording unit 22 is, for example, a recording medium such as a semiconductor memory or a magnetic disk. Furthermore, the data recorded by the recording unit 22 can be taken out using a USB (Universal Serial Bus, Universal Serial Bus) memory, SD (Secure Digital, Secure Digital) card, or the like.

As described above, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D and the mold quality evaluation device 12 can also be connected wirelessly (wireless communication). 6 is a block diagram showing the functional configuration when the pressure values (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are connected to the mold quality evaluation device 12 wirelessly (wireless communication). Figure. The pressure values (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are amplified by the amplifying unit 16' near the wet sand mold modeling sensor, and wireless from the pressure value transmitting unit 24 Send to the receiving part 15' of the mold quality evaluation apparatus 12. The mold quality evaluation device 12 for wireless data shown in FIG. 6 is provided with a receiving unit 15', an input unit 17, a mold strength calculation unit 18, a mold quality judgment unit 19, a display unit 20, a transmission unit 21, and a recording unit 22 .

The receiving unit 15' is a wireless signal transmitted from the pressure value transmitting unit 24 after the pressure value (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D is amplified by the amplifying unit 16' data. Furthermore, the functions of the input unit 17, the mold strength calculation unit 18, the mold quality determination unit 19, the display unit 20, the transmission unit 21, and the recording unit 22 are the same as the functions of the mold quality evaluation device 12 for wired data described above.

(The relationship between the pressure measured by the wet sand mold modeling sensor and the mold strength of the wet sand mold molded)

Next, the relationship between the pressure value (peak pressure) applied to the pressing surface of the squeeze plate measured by the wet sand mold modeling sensor and the strength of the mold of the molded wet sand mold will be described. In order to investigate these relationships, experiments were conducted using molding machines. FIG. 7 is a schematic diagram showing the structure of the experiment conducted this time, (a) shows a cross-sectional view, and (b) shows a plan view of an extruded plate. The model 3 is arranged in the cross-sectional view shown in FIG. 7(a), but the experiment was conducted with the model 3 installed and the model 3 not installed. In addition, the top view of the squeeze plate 8 in FIG. 7(b) also shows the positional relationship between the squeeze plate and the sensor, and the amplifier integrated recording that amplifies and records the signal from the pressure sensor Device 25, and a personal computer 26 connected to an amplifier-integrated recorder 25 and performing analysis such as graphing of sensor measurement values. The experiment was conducted as follows.

1. Install (embed) wet sand mold modeling sensor in the extrusion plate. As shown in FIG. 7, the provided parts are a total of three parts of the center part (S3) of the extrusion plate and the two parts (S1, S2) of the corner part across the center part. In addition, this experiment was conducted with the model installed and the model not installed.

2. The wet sand mold is molded by the molding machine provided with the wet sand mold molding sensor in the extrusion plate. Then, in the pressing step, the pressure applied to the pressing surface of the pressing plate was measured using three wet sand mold modeling sensors. Measure and record the change in pressure over time. Furthermore, the squeeze is slowly applied until the set pressure is reached, and the pressure is released when the set pressure is reached.

3. Use the mold strength meter to measure the mold strength of the wet sand mold on the parting surface opposite to the pressure measured by the wet sand mold modeling sensor, and investigate the relationship between the pressure value and the mold strength. Furthermore, the mold strength of the parting surface opposed to the position of the pressure measured by the wet sand mold modeling sensor at the center (S3) when the model is installed becomes the mold strength of the upper surface of the model. In addition, a strength meter for measuring the strength of a mold is an intrusive mold strength meter widely used in foundries to evaluate the moldability of wet sand molds. A needle with a tip diameter of about 3 mm penetrates into the mold for about 10 mm to measure the mold strength.

Then, the above 2 and 3 are performed on a plurality of wet sand molds, and the data are collected.

(Experimental results)

Fig. 8 is a graph showing an example of the change with time of the pressure of the wet sand mold shape sensor in the extrusion step. In addition, this figure shows the case where the squeeze pressure is set to 0.6 MPa when there is no model, and the measurement is performed with three sensors. As shown in Fig. 8, during the extrusion step, the molding machine reached its peak pressure about 3 seconds after the start of extrusion.

Also, after confirming the relationship between the position of the shape sensor and the peak pressure, the pressure at the center of the squeeze plate (S3) is low, and the pressure around the squeeze plate (S1, S2) becomes high. From this, it can be confirmed that the surrounding of the extruded plate is compacted by the frictional resistance of the wet sand mold sand and the metal frame because the metal frame wall is located nearby. In contrast, the central part (S3) is from the metal frame The wall separation is not compacted by the influence of the metal frame, so the pressure becomes lower relative to the surroundings. In addition, in terms of the peak pressure of the modeling sensor in the case of the model, the degree of compaction of the wet sand mold sand on the model is larger than that of the corner, so the central part (S3) becomes higher, This part consumes squeezing force and the surrounding squeezing force decreases, so it can be seen that the surroundings (S1, S2) become lower.

Fig. 9 is a graph that summarizes the relationship between the peak pressure of the wet sand mold shape sensor and the strength of the mold under the setting of the extrusion pressure and the filling state of the wet sand mold sand, and the model The presence or absence of the center part (S3) and the surroundings (S1, S2), the peak pressure of the pressing surface of the extrusion plate, and the measurement of the mold strength of the wet sand mold on the parting surface opposite to the position where the pressure is measured The value is plotted. Observing the relationship between the peak pressure of the wet sand mold modeling sensor shown in FIG. 9 and the mold strength of the wet sand mold on the parting surface opposite to the position where the pressure is measured, it can be seen that it is related to the surrounding (S1 S2) Corresponding points, whether the model has little effect or not, has a high correlation. On the other hand, the point corresponding to the central part (S3) differs depending on the presence or absence of the model. In the case of the model, the mold strength is higher for the peak pressure than in the case of no model. tendency.

Summarizing the above results, it is clearly understood that the pressure reaching the pressing surface of the squeeze plate varies depending on the surroundings, the position of the central portion, and the presence or absence of the model. The strength of the mold opposite the extrusion plate is positively related to the pressure to the pressing surface of the extrusion plate, but the central part is different depending on the presence or absence of the model, and the surrounding area is not affected by the presence or absence of the model .

Regarding the relationship between the filling density of the wet sand mold sand and the strength of the mold, if the filling density is higher, the mold strength becomes higher. There is a strong positive correlation between packing density and mold strength and compressive strength. The peak pressure measured by the shape sensor has the same meaning as the pressure strength, so if the peak pressure is higher, a higher packing density can be obtained. In the case where the filling density of the molded wet sand mold is low, that is, the strength of the casting mold is low, there may be defects such as penetration of the melt, removal of the mold, sand inclusion, and leakage. In addition, when the filling density of the formed wet sand mold is too high, there is a possibility that the sliding resistance between the mold and the casting mold increases, which may cause poor mold release. Thus, if the detected peak pressure of the wet sand mold shape sensor is properly maintained, the connection is reduced.

(Placement of wet sand mold shape sensor)

The pressure transmitted to the wet sand mold modeling sensor embedded in the extruded plate changes due to the above reasons, so the embedding position of the wet sand mold modeling sensor must be a part that can grasp these conditions. Therefore, if a plurality of wet sand mold modeling sensors are provided, although more state defects can be detected, it is unrealistic in terms of space constraints and economic aspects, and it is ideal to perform a smaller number of pressure detections And evaluation.

As described above, the filling of the wet sand mold sand by the mold molding device 1 can use the gravity drop method or the air blowing method. In the gravity drop method using the above-mentioned shutter hopper, etc., the unevenness when the wet sand mold sand is put into the shutter hopper becomes unevenness when it is thrown into the mold molding space. In addition, in the air blowing method, there may be unevenness at the time of input into the molding space of the mold due to the distance from the sand blowing nozzle, clogging of the nozzle mouth, and the like. These unevennesses appear as the unevenness of the compaction pressure of the squeeze plate 8 against the wet sand mold sand during the subsequent compaction of the wet sand mold sand. Considering the unevenness of the initial filling amount, there is a need to configure a wet sand mold modeling sensor.

Then, when the difference of the measured values of the configured wet sand mold shape sensor is outside the predetermined threshold range, it can be judged that the initial filling unevenness is large, so that the wet sand mold sand can be taken to the shutter Improve the input condition in the hopper, or adjust the air pressure of the sand blowing, blowing time, improve the state of the blowing nozzle (sand clogging, wear, etc.). In addition, when the wet sand mold sand is input into the shutter hopper, from the shutter hopper into the mold molding space, or when blowing by blowing, the fluidity of the wet sand mold sand is affected. The fluidity of the wet sand mold sand changes according to the sand characteristics such as the water content of the wet sand mold sand, and therefore it is possible to adjust a sand processing device such as a kneading machine that kneads the wet sand mold sand supplied to the mold molding device 1.

In addition, when the wet sand mold sand is compacted, the wet sand mold sand is compressed by the compressive force, and the pressure is detected by the wet sand mold modeling sensor embedded in the extrusion plate. The relationship between the pressure detected by the wet sand mold modeling sensor embedded in the extruded plate and the strength of the mold opposed to the extruded plate is shown in the above experimental results, and it is confirmed that the central part is based on the model The relationship is different depending on whether there is or not, and the surroundings are not affected by the presence or absence of the model.

Therefore, in order to evaluate the strength of the mold according to the compression strength of the extruded plate, it is preferable to install the wet sand mold shape sensor near the side of the casting frame, especially the corners, which is not affected by the presence or absence of the model. If the measurement value of the wet sand mold modeling sensor set at this position does not reach the predetermined lower limit threshold, it can be judged that the mold strength is not reached enough, and the process of increasing the pressing strength can be taken if it is higher than the upper limit If the threshold value is exceeded, it can be judged that the mold strength has become sufficient and sufficient.

In this embodiment, considering the filling step of the wet sand mold sand and the compacting step of the wet sand mold sand, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are buried in the four corners of the extrusion plate 8 .

Furthermore, the relationship between the peak pressure of the wet sand mold modeling sensor and the strength of the mold is the same when using other types of frame molding machines and frameless molding machines. Therefore, these relationships can also be applied to the mold-molding device of the second embodiment described below.

(Calculation method of mold strength)

Next, a method of calculating the mold strength calculated by the mold strength calculation unit 18 will be described. As mentioned above, it has been found that there is a correlation between the strength of the mold and the peak pressure of the wet sand mold modeling sensor. The mold strength calculation unit 18 uses this relationship to calculate the mold strength from the mold strength input to the input unit 17 and the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D.

Specifically, the calculation of the mold strength by the mold strength calculation unit 18 includes two steps.

-step 1

A predetermined number of wet sand molds are molded in advance, and the pressure values (peak pressures) are measured using the wet sand mold modeling sensors 10A, 10B, 10C, and 10D during extrusion. Furthermore, the operator measures the mold strength of the parting surface opposite to the position where the pressure is measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D in each of the molded wet sand molds and inputs it to the input section 17. Then, the operator decides the formula y=ax+b from the relationship between the mold strength and the pressure value (peak pressure).

Furthermore, in the present embodiment, based on the above experimental results, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are embedded in the four corners of the extrusion plate 8. Measure the pressure applied to the pressing surface of the extruded plate at these four locations, and find the relationship between it and the strength of the mold, by which a smaller number of wet sand mold modeling sensors can be used to take into account the pressing surface of the extruded plate Judgment of casting quality with uneven pressure. In addition, when a predetermined number of moldings are performed, the relationship between the pressure applied to the pressing surface in a wider range and the strength of the mold can be obtained by changing the pressing pressure.

FIG. 10 is a diagram showing an example of the screen displayed on the display unit 20. In this example, a predetermined wet sand mold is initially molded. At this time, the pressure values (peak pressures) measured by the wet sand mold modeling sensors 10A and 10B are displayed on seven screens. Furthermore, it is possible to switch to seven screens displaying the pressure values (peak pressures) measured by the wet sand mold modeling sensors 10C and 10D. Furthermore, the wet sand mold modeling sensor 10A can also be displayed on one screen , 7B, 10C, 10D measured pressure value (peak pressure) 7 are displayed on the screen.

Then, the operator inputs the strength of the mold of the parting surface facing each of the molded wet sand molds and the position where the wet sand mold molding sensors 10A, 10B, 10C, and 10D are arranged as input values. Here, "peak pressure A" and "mold strength A" in the table of the figure are the peak pressure value of the wet sand mold modeling sensor 10A, and the mold strength of the position of the wet sand mold modeling sensor 10A. The "peak pressure B" and "mold strength B" in the table are the peak pressure value of the wet sand mold modeling sensor 10B and the mold strength of the position of the wet sand mold modeling sensor 10B, which is displayed on the switched The "peak pressure C" and "mold strength C" of the screen are the peak pressure value of the wet sand mold shape sensor 10C and the mold strength of the position of the wet sand mold shape sensor 10C, which is displayed on the screen that is switched The "peak pressure D" and the "mold strength D" are the peak pressure value of the wet sand mold modeling sensor 10D and the mold strength at the position of the wet sand mold modeling sensor 10D.

The mold strength calculation unit 18 plots the mold strength and the peak value of the pressure of the wet sand mold modeling sensor (in this example, 7×4=28 parts) into a graph. Then, after the operator enters predetermined values for the slope "a" and intercept "b" of the equation, the straight line of y=ax+b is displayed. The operator confirms the drawing while changing the values of the slope "a" and the intercept "b" appropriately. After determining that the drawing is related to the straight line, the final formula y=ax+b is determined. Furthermore, if there is no problem with the strength of the mold, the wet sand mold that the operator has measured the strength of the mold can also be directly subjected to the subsequent steps (core setting step, pouring step, etc.) and supplied to production. In addition, in the above, the slope "a" and the intercept "b" of the operator input formula can be obtained by linear regression using a least square method using a computer or PLC.

-Step 2

After the decision of the formula y=ax+b, the modeling of the wet sand mold is started. After the start, the pressure values (peak pressures) measured from the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are automatically calculated using the formula y=ax+b for the wet sand mold modeling sensors 10A, 10B, Mold strength at 10C and 10D. Therefore, the operator does not need to separately measure the mold strength.

In addition, in this example, the mold strength is measured with a mold strength meter. The number of peak pressures and mold strengths displayed on the screen are A and B, respectively, but the wet sand mold can be shaped according to the specifications of the mold molding device 1 The specifications of the shape, size, etc., or the specifications of the wet sand mold sand are appropriately changed.

(Judgment method of mold quality)

Next, a method of judging the quality of the mold by the mold quality judging unit 19 will be described. The mold quality determination unit 19 determines the quality of the wet sand mold from the threshold value of the mold strength input to the input unit 17 and the mold strength calculated by the mold strength calculation unit 18.

Specifically, the determination of the mold quality by the mold quality determination unit 19 includes two steps.

-step 1

First, the operator inputs the threshold value of the mold strength of the molded wet sand mold. FIG. 11 is a diagram showing an example of the screen displayed on the display unit 20. In this example, the specific threshold value input by the operator is displayed. Here, the "normal range of sensor A strength" in the table of the figure is the lower and upper limit values of the mold strength at the position of the wet sand mold modeling sensor 10A, and the "sensor B of the table The "normal strength range" is the lower and upper limits of the mold strength at the position of the wet sand mold modeling sensor 10B. The "normal range of sensor C strength" in the table of the figure is the wet sand mold modeling sensor 10C The lower limit and upper limit of the strength of the mold at the location, "normal range of sensor D strength" in the table of the figure is the lower and upper limit of the strength of the mold at the location of the wet sand mold modeling sensor 10D . In addition, the "abnormal value of mold strength difference (Max.-Min.)" in the table of the figure is obtained from the pressure values of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D as the maximum mold strength, The threshold value of the difference between the minimum values. In this example, the lower limit of the mold strength at the position of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D is 10.0 (N/cm ² ), and the upper limit is 20.0 (N/cm ² ). The threshold value of the abnormal value of the difference between the maximum value and the minimum value of the mold strength at the positions of the sand mold modeling sensors 10A, 10B, 10C, and 10D is set to 5.0 (N/cm ² ).

-Step 2

The mold strength calculation unit 18 determines the formula y=ax+b, and after inputting the threshold value of the mold strength, the molding of the wet sand mold is started. After the start, the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D automatically calculates the mold position of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D. strength. Then, the quality of the wet sand mold is determined from the threshold value of the input mold strength and the calculated mold strength. Here, the quality of the wet sand mold is determined as follows.

In this example, the threshold values of mold strength A, mold strength B, mold strength C, and mold strength D are set to 10.0 (N/cm ² ) or more and 20.0 (N/cm ² ) or less, respectively. The abnormal threshold value of the difference between the maximum value and the minimum value of the mold strength at the positions of the modeling sensors 10A, 10B, 10C, and 10D is set to 5.0 (N/cm ² ) or more. Therefore, the mold strength at the position of the wet sand mold modeling sensor 10A is 13.0 (N/cm ² ), the mold strength at the position of the wet sand mold modeling sensor 10B is 12.0 (N/cm ² ), the wet sand mold When the mold strength at the position of the shape sensor 10C is 16.0 (N/cm ² ) and the mold strength at the position of the wet sand mold shape sensor 10D is 14.0 (N/cm ² ), the mold strength A and the mold The strength B, the mold strength C, and the mold strength D all fall to the threshold. Furthermore, the maximum value of the mold strength A, B, C, and D is 16.0 (N/cm ² ), and the minimum value is 12.0 (N/cm ² ) The difference between the maximum and minimum values is 4.0 (N/cm ² ) and falls within the range, so the mold quality judgment unit 19 judges that the mold quality is OK.

In contrast, the mold strength at the position of the wet sand mold modeling sensor 10A is 11.0 (N/cm ² ), and the mold strength at the position of the wet sand mold modeling sensor 10B is 17.0 (N/cm ² ), wet When the mold strength at the position of the sand mold shape sensor 10C is 12.0 (N/cm ² ) and the mold strength at the position of the wet sand mold shape sensor 10D is 16.0 (N/cm ² ), the mold strength A , Mold strength B, mold strength C, and mold strength D all fall to the threshold, but the maximum value of mold strength A, B, C, D is 17.0 (N/cm ² ), the minimum value is 11.0 (N/ cm ² ), the difference between the maximum and minimum values is 6.0 (N/cm ² ), and does not fall within the range, so the mold quality determination unit 19 determines that the mold quality is NG.

FIG. 12 is a diagram showing an example of the screen displayed on the display unit 20. Here, the "peak pressure A", "peak pressure B", "peak pressure C", and "peak pressure D" in the table of the figure are the peak pressure value of the wet sand mold shape sensor 10A, and the wet sand mold shape The peak pressure value of the sensor 10B, the peak pressure value of the wet sand mold modeling sensor 10C, and the peak pressure value of the wet sand mold modeling sensor 10D. Also, "mold strength A", "mold strength B", "mold strength C", and "mold strength D" are the mold strength and mold of the position of the wet sand mold shape sensor 10A calculated by the mold strength calculation unit 18 The mold strength at the position of the wet sand mold modeling sensor 10B calculated by the strength calculation unit 18, the mold strength at the position of the wet sand mold modeling sensor 10C calculated by the mold strength calculation unit 18, and the humidity calculated by the mold strength calculation unit 18 The mold strength at the position of the sand mold shape sensor 10D.

Furthermore, the "mold strength difference (maximum-minimum)" in the table of the figure is the difference between the maximum value and the minimum value of the mold strength A, B, C, D, and the "judgment" in the table of the figure is judged by the quality of the mold Judgment of the quality of the casting mold conducted by the Department 19.

In addition, in the screen of the display unit 20 in FIG. 12, when the value is not good, the inside of the frame is hatched or colored, and OK (normal) and NG (bad) are clear at a glance.

In addition, the set mold strength A, mold strength B, mold strength C, and mold strength D of the threshold value, and the difference between the maximum and minimum values can be based on the specifications of the mold molding device 1, the molded wet sand The specifications of the shape and size of the mold, the location of the mold, or the specifications of the wet sand mold sand are appropriately determined. Moreover, these values are associated with the model model.

In the mold-molding apparatus 1 of this embodiment, even if the specifications of the shape and size of the wet sand mold to be molded are changed, the mold-strength calculation unit 18 can calculate the mold strength every time, and the mold quality judgment unit 19 can The quality of the molded wet sand mold is determined from the calculated mold strength.

Also, in this embodiment, the value of the calculated mold strength is used for the determination of OK (normal) and NG (bad), but it is not limited to this, because the pressure value in the wet sand mold modeling sensor There is a positive correlation between the strength of the mold and the mold. Therefore, the pressure of the wet sand mold modeling sensor can be used as the mold quality judgment instead of calculating the mold strength from the pressure value of the wet sand mold modeling sensor. Benchmark. For example, the value of the threshold value table of FIG. 11 that becomes the criterion for determining the quality of the casting mold can set the pressure value of the wet sand mold modeling sensor to a predetermined threshold value, and the measured wet sand mold modeling sense The pressure value of the detector is compared with this table, and it is judged as OK (normal) and NG (bad).

(Evaluation method of mold quality using mold molding equipment)

Next, a method of evaluating the quality of the mold (molding method of the wet sand mold) using the mold molding apparatus 1 will be described. 13 is a diagram showing the steps of a method for evaluating the quality of a mold (molding method for a wet sand mold) using the mold-molding apparatus 1 of the first embodiment. Furthermore, in FIG. 13, the shutter hopper 27 is connected to the extrusion head 7 of the mold molding apparatus 1 shown in FIG. 1. The shutter hopper 27 is configured such that after a predetermined amount of wet sand molding sand is charged from the wet sand molding sand conveying device (not shown) and temporarily stored, the shutter 28 below the shutter hopper 27 is opened to Wet sand mold sand is put into the molding space.

The molding of the wet sand mold by the mold molding apparatus 1 is performed in the following steps.

1. After the modeling is started, the state of FIG. 13(a) is reached by the rise of the platform 9. At this time, in the shutter hopper 27, a predetermined amount of wet sand mold sand is fed from a wet sand mold sand conveying device (not shown).

2. Then, as shown in FIG. 13(b), open the shutter 28 at the lower part of the shutter hopper 27, and put the wet sand mold sand in the shutter hopper 27 into the area divided by the plate 2, the metal frame 5 and the holding frame 6 The molding space formed.

3. Then, as shown in FIG. 13(C), the connected extrusion head 7 and shutter hopper 27 move, and the extrusion plate 8 is arranged directly above the molding space of the mold, and then, by the rise of the platform 9 Squeeze (compress) the wet sand in the molding space. At this time, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D measure the pressure value (peak pressure) of the pressing surface of the extrusion plate. Furthermore, in this step, a casting mold is formed. At this time, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are located between the wall of the metal frame 5 of the extrusion plate 8 and the mold 3.

4. The pressure value (peak pressure) of the pressing surface of the extrusion plate is sent to the mold quality evaluation device 12 to evaluate the quality of the wet sand mold just being molded.

The quality evaluation performed by the mold quality evaluation device 12 is performed after the formula y=ax+b indicating the relationship between the mold strength and the peak pressure of the wet sand mold modeling sensor is determined in advance. Then, the wet sand mold system judged to be OK by the mold quality evaluation device 12 directly flows into the production line, and the subsequent steps (such as pouring) are performed. On the other hand, although the mold determined by the mold quality evaluation device 12 as NG still flows directly into the production line, the subsequent steps (pouring, etc.) are not performed, these steps are omitted, and the mold quality evaluation is judged as a discarded mold The wet sand mold for OK is removed in the same manner. In this way, the "good" and "poor" judgments of the quality of the molded mold can be made for each frame, so the quality of the mold for each frame can be guaranteed. In addition, the defects can be judged at the molding time of the wet sand mold, so the defects of the castings produced can be reduced. Furthermore, redundant operations can be omitted, so manufacturing costs can be reduced.

5. Then, in the mold-molding device 1, the platform 9 is lowered, the containing frame 6 is separated from the upper surface of the metal frame 5, and after the platform is lowered, the metal frame 5 in which the wet sand mold is built is placed on the mold core On the roller conveyor connected in the subsequent steps of installation, pouring, etc., the model 3 is pulled out from the wet sand mold, and the lowering of the platform 9 is stopped. Then, the metal frame 5 in which the wet sand mold is embedded is transported to a later step on the roller conveyor and the metal frame 5 is carried into the mold molding device 1 toward the next molding. Furthermore, after the start of the lowering of the platform 9, a certain amount of wet sand mold sand is supplied to the shutter hopper 27 with the shutter 28 closed.

6. Move the metal frame 5 toward the next molding, and after supplying the wet sand mold sand to the shutter hopper 27, the connected extrusion head 7 and the shutter hopper 27 move, and the shutter hopper 27 is arranged in the molding space The platform 9 rises in the state directly above it, and the shape of the next wet sand mold is started.

Then, the pressure value data generated in the molding step, the mold strength data associated with the pressure value, the mold strength calculation result, and the mold quality judgment result are all recorded in the recording portion 22 of the mold quality evaluation device 12, so it is possible Using these values to monitor the operating state of the mold-molding device 1 can contribute to quality management, maintenance, and troubleshooting of the mold-molding device 1. Furthermore, these values can be used to early discover the undesirable causes of sand leakage caused by poor filling, sintering adhesion of castings, falling sand, and expansion of the wet sand mold caused by the melt pressure after pouring.

Furthermore, the data recorded in the recording section 22 is recorded for each model mounted on the plate 2, so that the state of the wet sand mold and the pressure value data can be compared and compared, and the clinical setting can be set more accurately. Limit.

In addition, in this embodiment, the operator determines the formula y= based on the strength of the mold plotted on the graph and the peak pressure of the wet sand mold modeling sensor, considering the slope "a" and the intercept "b" of the formula ax+b, but it can also be configured that the relationship between the mold strength and the peak pressure of the wet sand mold modeling sensor from the mold strength calculation unit 18 can be calculated automatically using a computer or PLC by linear regression using the least square method, etc. y=ax+b.

In addition, in this embodiment, when it is determined that the wet sand mold to be molded is defective, the operator clearly indicates that the wet sand mold is defective, but it may be configured to automatically transmit the determination result to a subsequent step ( Casting equipment, etc.). In this case, in the subsequent steps, if the wet sand mold is defective, the casting equipment automatically recognizes and omits (skips) the step, and finally removes the wet sand mold.

Furthermore, in this embodiment, the wet sand mold shape sensors 10A, 10B, 10C, and 10D are embedded in the four corners of the extrusion plate 8, but even if the wet sand mold shape sense is embedded in the extrusion plate 8 The small number of sensors can also calculate the relationship between the mold strength and the peak pressure of the wet sand mold shape sensor. In this case, the accuracy is slightly lower than in the case where the wet sand mold modeling sensor is buried in four places, but the cost can be suppressed.

In this case, the wet sand mold modeling sensor can also be embedded in the two positions 10A, 10B, or 10C, 10D on the diagonal shown in FIG. 2. 14 and 15 are diagrams showing other examples of the extrusion plate 8 in which the wet sand mold modeling sensors 10A and 10B are embedded. In these figures, 3a shown by the two-dot chain line indicates the position corresponding to the model 3 on the plate 2 on which the model is installed in the molding space of the mold. In FIG. 14, two wet sand mold modeling sensors 10A, 10B are embedded in the long side of the extrusion plate 8 and near the center thereof. In FIG. 15, two wet sand mold modeling sensors 10A, 10A, 10B is buried in the short side of the pressing plate 8 and near the center.

In any case, the buried position of the wet sand mold modeling sensor is in the mold molding space, corresponding to the position between the metal frame 5 and the model 3, that is, the model 3 on the plate 2 on which the model 3 is installed It is between the metal frame 5 and the side of the plate 2 facing the non-model part of the extruded plate or extruded foot.

In this way, according to the mold-molding apparatus of the first embodiment, when the wet-sand mold-forming sensors 10A, 10B, 10C, and 10D are molded in the wet-sand mold, the wet-sand mold sand and the extrusion applied to the mold-forming space are measured. The pressure value (peak pressure) of the pressing surface of the plate 8. Next, the mold strength calculation unit 18 of the mold quality evaluation device 12 uses the correlation between the mold strength measured in advance and the peak pressure of the wet sand mold modeling sensors 10A, 10B, 10C, and 10D to determine the shape of the wet sand. The mold is calculated from the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D. Next, the mold strength calculation unit 18 of the mold quality evaluation device 12 determines the quality of the wet sand mold from the predetermined mold strength threshold value and the mold strength calculated by the mold strength calculation unit 18. Thereby, the mold strength of the wet sand mold to be molded can be calculated individually without measuring with a mold strength meter, and the quality of the wet sand mold can be evaluated.

In addition, according to the mold molding apparatus of the first embodiment, the wet sand mold determined by the mold quality evaluation apparatus 12 as NG does not perform the subsequent steps (pouring, etc.), and the mold is removed as a discarded mold, so the manufacturing can be reduced. The wet sand mold is bad. Furthermore, redundant operations can be omitted, so the manufacturing cost can be reduced.

In addition, according to the mold-molding apparatus of the first embodiment, the "good" and "poor" judgments of the mold quality to be molded can be performed for each frame, so that it can be linked to the mold quality assurance for each frame.

In addition, according to the mold molding apparatus of the first embodiment, the pressure value data generated during the molding step, the mold strength data associated with the pressure value, the mold strength calculation result, and the mold quality judgment result are all recorded in the mold quality evaluation The recording portion 22 of the device 12 can use these values to monitor the operating state of the mold-molding device 1, which can contribute to quality management, maintenance, and troubleshooting of the mold-molding device 1. Furthermore, these values can be used to early discover the undesirable causes of sand leakage caused by poor filling, sintering adhesion of castings, falling sand, and expansion of the wet sand mold caused by the melt pressure after pouring.

Furthermore, according to the mold-molding apparatus of the first embodiment, the data recorded in the recording unit 22 is recorded for each model mounted on the plate 2, so that the state of the wet sand mold and the pressure value data can be performed The comparative study can set the threshold more accurately.

(Second embodiment)

Next, a second embodiment of the mold molding apparatus, mold quality evaluation apparatus, and mold quality evaluation method of the present invention will be described. In addition, in the second embodiment described below, the configuration common to the first embodiment is denoted by the same symbol in the figure, and the description thereof is omitted. In the second embodiment, a frameless molding machine is used instead of a framed molding machine.

The second embodiment will be described with reference to the accompanying drawings. FIG. 16 is a schematic diagram showing the structure of the mold-molding device of the second embodiment, and FIG. 17 is a diagram showing the configuration of a part for evaluating mold quality in the mold-molding device. The casting mold molding apparatus of this embodiment is a frameless molding machine that pulls out the wet sand mold from the casting frame after molding the wet sand mold.

The mold-molding device 29 is equipped with a plate 2 with a model 3 mounted on the upper and lower surfaces, a shuttle 30, an upper frame (metal frame) 31, a lower frame 32 (metal frame), an upper extrusion plate 33, a lower extrusion plate 34, Wet sand mold modeling sensors 10A, 10B, 10C, 10D embedded in the pressing surface of the upper pressing plate 33, and wet sand mold modeling sensors 10E, 10F embedded in the pressing surface of the lower pressing plate 34 , 10G, 10H, wiring 11, and mold quality evaluation device 12. Furthermore, FIG. 17 shows the wet sand mold shape sensors 10A, 10B, 10C, and 10D embedded in the upper pressing plate 33 as viewed from the line B-B in FIG. 16. In addition, the wet sand mold modeling sensors 10E, 10F, 10G, and 10H are embedded in the lower pressing plate 34, and are shown at the same positions as in FIG. (Brackets indicate the sensor symbols of the lower extruded plate when viewed along the line C-C of Figure 16)

The plate 2 is a model 3 used to mold the shape of the casting into a wet sand mold on the upper and lower sides of the plate. The plate 2 is placed on the shuttle 30, and it goes back and forth between the mold molding device 29 according to the steps. The upper frame 31 is filled with wet sand mold sand for molding the upper mold of the wet sand mold. That is, the mold molding space surrounded by the upper frame 31, the upper extrusion plate 33, and the plate material 2 is filled with wet sand molding sand. The lower frame 32 is filled with wet sand mold sand for molding the lower mold of the wet sand mold. That is, the molding space surrounded by the lower frame 32, the lower extruded plate 34, and the plate material 2 is filled with wet sand molding sand. The upper squeeze plate 33 and the lower squeeze plate 34 have a rectangular shape, and form part of the boundary of the molding space formed by the upper frame 31 and the lower frame 32 when the wet sand mold is molded by the mold molding device 29 Of building blocks.

In the filling of the wet sand molding sand by the molding equipment 29, a blowing method using an air flow is used. The blowing method is a method of filling wet sand mold sand by blowing wet sand mold sand onto the upper and lower surfaces of the plate 2 from the wet sand mold sand inlets 35 and 35 of the upper and lower frames 31 and 32.

The upper squeeze plate 33 and the lower squeeze plate 34 are operated by cylinders (not shown) by compacting the wet sand mold sand filled into the upper frame 31 and the wet sand mold sand filled into the lower frame 32 and Simultaneously mold the upper and lower wet sand molds by compression.

(Wet sand mold modeling sensor)

When the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are attached to the wet sand mold, the pressure value (peak value) applied to the pressing surface of the wet sand mold sand filled in the upper frame 31 and the upper pressing plate 33 (peak value) is measured. pressure). The wet sand mold shape sensors 10E, 10F, 10G, and 10H are used to measure the pressure value applied to the pressing surface of the wet sand mold sand filled in the lower frame 32 and the lower pressing plate 34 when the wet sand mold is molded ( Peak pressure). Wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H pressure sensors. In this embodiment, the wet sand mold modeling sensors 10A, 10B, 10C, and 10D are embedded in the four corners of the pressing surface of the upper pressing plate 33. The wet sand mold shape sensors 10E, 10F, 10G, and 10H are embedded in the four corners of the pressing surface of the lower pressing plate 34. The reason why the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H are buried in this way is the same as the reason explained in the first embodiment.

In addition, the wet sand mold shape sensors 10A, 10B, 10C, 10D, and 10E, 10F, 10G, and 10H are pressure surfaces exposed to the pressing surfaces exposed to the pressing plate 33 and the pressing plate 34, and the measurement is applied to the upper side. The pressure value (peak pressure) of the pressing surfaces of the pressing plate 33 and the lower pressing plate 34. At this time, it is preferable that the pressure-bearing surfaces of the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H and the pressing surfaces of the upper pressing plate 33 and the lower pressing plate 34 become the same plane State and no step difference. With this, the correct pressure can be measured.

The wiring 11 connects the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H to the mold quality evaluation device 12. In this embodiment, the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H and the mold quality evaluation device 12 are connected by wire through the wiring 11, but can also be connected wirelessly . For example, it is possible to send the pressure values (pressure value data) detected by the wet sand mold shape sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H to the mold quality using wireless communication such as wireless LAN, Bluetooth, etc. Evaluation device 12.

The mold quality evaluation device 12 evaluates the shape molded by the mold molding device 29 from the pressure values (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D, and 10E, 10F, 10G, and 10H. The quality of wet sand molds. The mold quality evaluation device 12 includes a receiving unit 15, an amplification unit 16, an input unit 17, a mold strength calculation unit 18, a mold quality determination unit 19, a display unit 20, a transmission unit 21, and a recording unit 22.

The receiving unit 15 receives the pressure values (pressure value data) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H. The amplifier 16 amplifies the signal amount of the received pressure value (pressure value data). The input unit 17 inputs the mold strength measured with a mold strength meter for the molded wet sand mold, the value of the slope "a" and the intercept "b" of the formula y=ax+b, and the mold of the molded wet sand mold Threshold of intensity, etc.

The mold strength calculation unit 18 is a pressure value (peak pressure) measured from the mold strength input to the input unit 17 and the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H, The mold strength is calculated for each pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D, and 10E, 10F, 10G, and 10H based on the relationship between the measured value and the mold strength. .

The mold quality determination unit 19 determines the quality of the molded wet sand mold from the threshold value of the mold strength input to the input unit 17 and the calculated mold strength. The display unit 20 combines the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, and 10H with the mold strength input by the operator using the input unit 17 The relationship between the pressure value (peak pressure) and the value of the slope "a" and intercept "b" of y=ax+b, the threshold value of the mold strength of the wet sand mold that is input by the operator , Mold strength calculation results, and mold quality judgment results are displayed on the screen.

The transmission unit 21 transmits NG determination data to the warning lamp 23 and the like. The recording unit 22 records pressure value data, mold strength data related to the pressure value, mold strength calculation results, mold quality judgment results, and the like.

(Evaluation method of mold quality using mold molding equipment)

Next, the evaluation method of the mold quality (molding method of the wet sand mold) using the mold molding apparatus 29 is demonstrated. FIG. 18 is a diagram showing the steps of a method of evaluating the quality of a mold (molding method of a wet sand mold) using the mold-molding device 29 of the second embodiment. Furthermore, in FIG. 18, a sand tank 36 is adjacent to the mold-molding device 29 shown in FIG. The sand tank 36 is charged with a predetermined amount of wet sand mold sand from a wet sand mold sand conveying device (not shown), and after being temporarily stored, the injection hole is closed, compressed air is supplied into the sand tank 36, and the upper and lower casting frames 31, 32. The wet sand mold sand blowing inlets 35, 35 blow the wet sand mold sand into and fill the upper and lower mold molding space.

The molding of the wet sand mold by the mold molding device 29 is performed in the following steps.

1. After the molding is started, the shuttle 30 on which the plate 2 is placed moves from the state of FIG. 18(a) between the upper frame 31 and the lower frame 32, and the plates 2 are equipped with models 3 and 3.

2. Then, the lower extruded plate 34 and the lower frame 32 in which the wet sand mold modeling sensors 10E, 10F, 10G, and 10H are embedded are raised, and the plate 2 is lifted from the shuttle 30 to the state shown in FIG. 18(b) After that, compressed air is supplied to the sand tank 36, and the wet sand molding sand is blown into and filled into the upper and lower molding space through the wet sand molding sand inlets 35 and 35 of the upper and lower casting frames 31 and 32.

3. Then, the upper and lower pressing plates 33, 34 embedded with the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H are squeezed by the action of the cylinder barrel (not shown) The wet sand mold sand in the upper and lower casting frames 31 and 32 is pressed (compressed) into a state shown in FIG. 18(c). At this time, the wet sand mold shape sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, 10H measure the pressure value (peak pressure) of the pressing surfaces of the upper and lower pressing plates 33, 34. Furthermore, a wet sand mold is molded in this step. At this time, the wet sand mold shape sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, and 10H are located on the upper casting frame 31 and the lower casting frame 32 of each of the upper extrusion plate 33 and the lower extrusion plate 34. Between the wall and the model 3. At this time, the measured pressure value (peak pressure) is sent to the mold quality evaluation device 12 to evaluate the quality of the wet sand mold just molded.

The quality evaluation by the mold quality evaluation device 12 is performed after the formula y=ax+b, which indicates the relationship between the mold strength and the peak pressure of the wet sand mold modeling sensor, is determined in advance. Then, the wet sand mold system judged by the mold quality evaluation device 12 to be OK flows directly into the production line and the subsequent steps (such as pouring) are performed. On the other hand, although the wet sand mold judged by the mold quality evaluation device 12 as NG still flows directly into the production line, the subsequent steps (such as pouring) are not performed, these steps are omitted, and the mold quality is evaluated as a discarded mold The wet sand mold judged as OK is also subjected to mold removal.

4. Then, after the lower squeeze plate 34 and the lower frame 32 are lowered and the plate material 2 is placed on the shuttle 30, the molds 3 and 3 are released from the upper and lower wet sand molds. Then, the shuttle 30 moves to the position shown in FIG. 18(a), and after the lower pressing plate 34 and the lower frame 32 rise again, the upper frame 31 and the lower frame 32 are combined to perform the mold clamping of the upper and lower wet sand molds. At this time, the upper and lower wet sand dies are in a state sandwiched by the upper pressing plate 33 and the lower pressing plate 34. After the upper squeeze plate 33 and the lower squeeze plate 34 are lowered from this state, the upper and lower wet sand dies that have been clamped are removed from the upper frame 31 and the lower frame 32 to become the state of FIG. 18(d).

5. The upper and lower wet sand molds to be clamped are transferred from the casting mold molding device 29 to the next production line.

Then, the pressure value data generated in the molding step, the mold strength data associated with the pressure value, the mold strength calculation result, and the mold quality judgment result are all recorded in the recording portion 22 of the mold quality evaluation device 12, so it can be used These values monitor the operation state of the mold-molding device 29, which can contribute to the quality management, maintenance, and troubleshooting of the mold-molding device 29. Furthermore, these values can be used to early discover the undesirable causes of sand leakage caused by poor filling, sintering adhesion of castings, falling sand, and expansion of the wet sand mold caused by the melt pressure after pouring.

In this embodiment, the wet sand mold modeling sensors 10A, 10B, 10C, 10D, and 10E, 10F, 10G, and 10H are embedded in the upper frame 31 and the lower frame of the pressing surfaces of the upper and lower pressing plates 33, 34. 4 corners near 32, but even if the number of wet sand mold modeling sensors buried in the upper and lower extrusion plates 33, 34 is small, the peak value of the mold strength and the pressure of the wet sand mold modeling sensor can be calculated relationship. In this case, the accuracy is slightly lower than in the case where the wet sand mold modeling sensor is buried in four places, but the cost can be suppressed.

In this case, the two positions on the diagonal of the pressing surface of the upper pressing plate 33 shown in FIG. 17 can also be set to 10A, 10B or 10C, 10D, or the diagonal of the pressing surface of the lower pressing plate 34 The two parts on the line are set to 10E, 10F or 10G, 10H. 19 and 20 are diagrams showing other examples of embedding the wet sand mold modeling sensors 10A and 10B on the pressing surface of the upper pressing plate 33. In these figures, 3a shown by the two-dot chain line indicates the position corresponding to the model 3 on the plate 2 on which the model is installed in the molding space of the mold. In FIG. 19, two wet sand mold modeling sensors 10A, 10B are embedded on the long side of the extrusion plate 33 and near the center thereof. In FIG. 20, two wet sand mold modeling sensors 10A, 10A, 10B is embedded in the short side of the pressing plate 33 and near the center thereof. On the pressing surface of the lower pressing plate 34, the shape sensors 10E and 10F can also be arranged in the same state. According to the configuration of these shape sensors, it is possible to grasp the unequal filling amount due to the vicinity and distance of the wet sand mold sand blowing ports 35, 35, or around the wet sand mold sand blowing ports 35, 35.

In this way, according to the mold-molding apparatus of the second embodiment, the wet sand mold-forming sensors 10A, 10B, 10C, and 10D measure the pressing surface applied to the wet sand mold sand filled in the upper frame 31 and the upper pressing plate 33 Pressure value (peak pressure), the wet sand mold shape sensors 10E, 10F, 10G, 10H measure the pressure value applied to the pressing surface of the wet sand mold sand filled into the lower frame 32 and the lower pressing plate 34 (Peak pressure). Next, the mold strength calculation unit 18 of the mold quality evaluation device 12 correlates the pre-measured mold strength with the peak pressure of the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, and 10H. In relation to the wet sand mold to be molded thereafter, the mold strength is calculated from the pressure values (peak pressures) measured by the wet sand mold modeling sensors 10A, 10B, 10C, 10D and 10E, 10F, 10G, and 10H. Next, the mold strength calculation unit 18 of the mold quality evaluation device 12 determines the quality of the mold from the preset threshold value of the mold strength and the mold strength calculated by the mold strength calculation unit 18. Thereby, the mold strength of the wet sand mold to be molded can be calculated individually without measuring with a mold strength meter, and the quality of the wet sand mold can be evaluated.

In addition, according to the mold molding apparatus of the second embodiment, the wet sand mold judged by the mold quality evaluation device 12 as NG does not perform the subsequent steps (such as pouring), but is removed as a discarded mold, so the number of manufactured parts can be reduced. Defective wet sand mold. Furthermore, redundant operations can be omitted, so the manufacturing cost can be reduced.

In addition, according to the mold-molding apparatus of the second embodiment, the "good" and "poor" judgments of the mold quality to be molded can be performed for each frame, so it can be linked to the mold quality assurance for each frame.

In addition, according to the mold molding apparatus of the second embodiment, the pressure value data generated during the molding step, the mold strength data associated with the pressure value, the mold strength calculation result, and the mold quality judgment result are all recorded in the mold quality evaluation The recording portion 22 of the device 12 can use these values to monitor the operating state of the mold-molding device 29, which can contribute to quality management, maintenance, and troubleshooting of the mold-molding device 29. Furthermore, these values can be used to early discover the undesirable causes of sand leakage caused by poor filling, sintering adhesion of castings, falling sand, and expansion of the wet sand mold caused by the melt pressure after pouring.

(Modification)

In the first and second embodiments, the mold quality evaluation device 12 is measured from the measured mold strength and wet sand mold shape sensors 10A, 10B, 10C, 10D (and 10E, 10F, 10G, 10H) After determining the relationship between the mold strength and the pressure value (peak pressure) of the pressure value (peak pressure), from the wet sand mold modeling sensors 10A, 10B, 10C, 10D (and 10E, 10F, 10G, 10H) The measured pressure value (peak pressure) was used to calculate the mold strength. Then, the quality of the molded wet sand mold is judged from the preset threshold value of the mold strength and the calculated mold strength.

In addition, the amount of water injected into the kneading machine can be accurately controlled by feeding back the results determined by the mold quality evaluation device 12 to the kneading machine. For example, the pressure value (peak pressure) measured by the wet sand mold modeling sensors 10A, 10B, 10C, and 10D (and 10E, 10F, 10G, and 10H) is extremely low. As a result, when the mold strength is extremely low, the mold quality The evaluation device 12 judges that the reason is that the casting frame is not evenly filled with sand. The reason is that the wet sand mold sand has a high CB (compactibility) value, which can be reduced by the amount of water injected. Instruct the mixing machine to eliminate the poor filling of the wet sand mold sand.

Furthermore, the results determined by the mold quality evaluation device 12 and the wet sand mold sand automatic measurement system and the like for the compressive strength of the wet sand mold sand can be fed back to the kneading machine to control the input to The amount of additives, moisture, etc. in the kneading machine. For example, the characteristics of wet sand mold sand, such as the compressive strength, air permeability, compaction value, moisture value, etc. of the wet sand mold sand measured by the automatic measurement system of wet sand mold sand, and the sensor 10A, 10B, 10C, 10D (and 10E, 10F, 10G, 10H) measured pressure value (peak pressure) and its distribution to evaluate the flowability of wet sand mold sand, etc. Adding materials, moisture, etc. changes to eliminate mold defects.

Furthermore, in the first and second embodiments, the mold quality evaluation device 12 uses the measured mold strength and wet sand mold shape sensors 10A, 10B, 10C, and 10D (and 10E, 10F, 10G, and 10H). The measured pressure value (peak pressure) is converted into the mold strength, and the quality of the molded wet sand mold is judged by the mold strength, but it has been found that there is a correlation between the pressure value (peak pressure) and the mold strength, so It is also possible to directly determine the quality of the wet sand mold from the pressure value (peak pressure) without converting the strength of the mold.

(Third Embodiment)

21(a) is a longitudinal cross-sectional view of a mold-molding device according to a third embodiment of the present invention. Fig. 21(b) shows the squeeze foot when viewed along the line D-D. In addition, in the third embodiment described below, the configuration common to the first embodiment is denoted by the same reference numerals in the drawings, and the description thereof is omitted. In the third embodiment, the pressing leg is used instead of the pressing plate. In the figure, symbol 300 is a squeeze foot. The squeeze legs 300 are arranged in a rectangular shape, which is a member that forms a part of the boundary of the molding space defined by the metal frame 5 when the mold molding apparatus 1 molds the wet sand mold. As shown in FIG. 21(b), the wet sand mold modeling sensors 10I, 10J, 10K, and 10L are embedded in the respective pressing legs.

The embodiment shown in this figure differs from the first embodiment described above in that the pressing leg 300 is used as an element for performing the pressing operation. The squeeze foot 300 is controlled in such a manner that the squeeze foot 300 opposite to it is positioned up and down in accordance with the height of the model 3, and the filled wet sand mold sand is adjusted by moving it due to the squeeze action The height and the compaction pressure at the completion of extrusion are the same for all extrusion feet.

For example, as shown in FIG. 21(a), the squeeze legs 300b, 300d facing the higher part of the model 3 are located more toward the model than the squeeze legs 300a, 300c, 300e facing the lower part of the model 3 3 outstanding. After that, a molding space (not shown) is formed, and the wet sand mold sand (not shown) is filled with the positions of the squeeze legs 300a to 300e, and the amount of sand directly below the squeeze legs 300b and 300d It can be less than the amount of sand directly below the squeeze legs 300a, 300c, 300e. From this state, the extrusion head 7 is lowered, and the extrusion legs 300a to 300e are finally moved to a position where all the faces of the mold 3 coincide, and the extrusion step (not shown) is completed. By controlling the squeeze foot in this way, the compression ratio of the wet sand mold sand can be made equal regardless of the local height difference of the model 3.

Moreover, not only the height of the model but also the tendency of the filling state of the wet sand mold sand can be observed in advance, and the upper and lower positions of the pressing foot 300 can be adjusted in accordance with the unevenness of the filling of the wet sand mold sand. By controlling the squeeze foot in this way, even if there is a model, even if the sand filling before squeezing has a tendency to be uneven, the squeeze foot can be moved up and down when the sand is filled with wet sand and when it is squeezed The cylinder tube moves, so that any squeeze foot can be compacted with the same force. That is, the defect of the extruded board can be alleviated by the "uneven sand filling" generated by the model (the density distribution of the filling of the wet sand mold sand before compaction, and the uneven filling height of the wet sand mold sand before compaction) .

When the mold is properly managed and molded by the above actions, the (peak) pressure value measured by the wet sand mold modeling sensor embedded in the extrusion foot 300 is the same for all sensors Pressure value. Therefore, when the difference in the pressure values measured during modeling is not greater than the unevenness observed in normal conditions, it is considered to be abnormal due to some reasons. As these reasons, it is considered that the extreme conditions of unequal sand filling, or the cylinder that moves the squeeze foot malfunctions.

The case where the unevenness of the pressure value becomes large is considered to have a special unevenness, and the mold is evaluated as NG in the mold quality evaluation device and processed.

Here, as a method of judging the special unevenness, for example, it can be set as the case where, when molding a certain mold, the pressure measured by a plurality of wet sand mold modeling sensors embedded in the extrusion foot is calculated The standard deviation of the value, and the standard deviation is greater than the preset reference value. The setting of the reference value can be arbitrarily performed, for example, initially it can be set to a value deemed appropriate in terms of the quality of the mold.

In addition, the case where the average value of the standard deviation of the pressure values measured in the 10-frame casting mold previously molded is greater than 20% can also be regarded as a special unevenness. Here, it is possible to appropriately select the number of frames of the previously molded casting mold that is the object of calculation of the average value, or the ratio of how much larger than the average value is the criterion for judging the special unevenness.

In this embodiment, except for the points described above, the same operation and effect as in the above-mentioned first embodiment can be obtained by performing the mold-molding operation in the same manner as in the first embodiment.

The first, second, and third embodiments described above are examples in which two or more pressure sensors are provided on the squeeze plate or the squeeze foot. However, in the present invention, one pressure sensor may be provided on the Extruded plate or extruded feet. In this case, the location where the pressure sensor is installed is ideally near the model of the plate. In addition, in the case of one pressure sensor, the output of one pressure sensor also displays a value related to the strength of the mold at a specific position of the mold, so although the accuracy is reduced, the value of the mold can also be used for mold quality Evaluation.

Various embodiments of the present invention have been described above, but the above description does not limit the present invention, and various modifications including deletion, addition, and replacement of constituent elements are considered within the technical scope of the present invention.

1‧‧‧Molding moulding device (framed moulding)

2‧‧‧plate

3‧‧‧ model

4‧‧‧ vehicle

5‧‧‧Metal frame

6‧‧‧ Dress frame

7‧‧‧Extrusion head

8‧‧‧Extrusion board

9‧‧‧platform

10A~10D‧‧‧wet sand mold modeling sensor

11‧‧‧Wiring

12‧‧‧ Mold quality evaluation device

Claims (15)

A casting mold molding device, characterized in that it is provided with: a wet sand mold modeling sensor, which is used to compress the wet sand mold sand and the extrusion plate or squeezed into the mold molding space when the wet sand mold is molded; The pressure value applied to the contact portion of the presser foot is measured; and a mold quality evaluation device that evaluates the quality of the molded wet sand mold from the pressure value. The mold molding apparatus according to claim 1, wherein the mold quality evaluation apparatus includes a mold strength calculation unit that calculates the wetness from the pressure value based on the relationship between the pressure value and the mold strength of the wet sand mold having the pressure value measured The mold strength of the sand mold. The mold molding apparatus of claim 2, wherein the mold quality evaluation apparatus includes a mold quality judgment unit that judges the quality of the molded wet sand mold based on a predetermined threshold from the calculated mold strength. The mold-molding apparatus according to claim 2 or 3, wherein the mold-strength calculation unit calculates the mold strength of the wet sand mold for which the mold-strength is not measured. The mold-molding apparatus according to any one of claims 2 to 4, wherein the mold-quality evaluation device further includes display means that displays the pressure value calculated by the mold-strength calculation unit and the humidity measured with the pressure value The relationship between the mold strength of the sand mold. The mold molding apparatus according to any one of claims 1 to 5, wherein the mold quality evaluation apparatus further includes a recording means that records pressure value data generated during the molding of the wet sand mold and mold strength associated with the pressure value Data, calculation result of mold strength, and judgment result of mold quality. The mold molding apparatus according to any one of claims 1 to 6, wherein the transmission of the pressure value from the wet sand mold molding sensor to the mold quality evaluation apparatus is performed by wireless communication. The mold molding apparatus according to any one of claims 1 to 7, wherein the mold molding apparatus is a frameless molding machine or a framed molding machine. The casting mold molding apparatus according to any one of claims 1 to 8, wherein the extrusion plate is formed in a rectangular shape, the arrangement of the extrusion legs is formed in a rectangular shape, and a plurality of the above-mentioned wet sand mold molding sensing are provided The pressure sensors are embedded in the four corners of the squeeze plate or the squeeze feet in the four corners. A mold quality evaluation device, characterized in that, during the molding of a wet sand mold, the pressure value applied by the contact portion between the wet sand mold sand put into the mold molding space and the squeeze plate or squeeze foot is evaluated. The quality of the molded wet sand mold. The mold quality evaluation apparatus according to claim 10, wherein the mold quality evaluation apparatus includes a mold strength calculation unit that calculates from the pressure value based on the relationship between the pressure value and the mold strength of the wet sand mold having the pressure value measured The mold strength of the wet sand mold. The mold quality evaluation device according to claim 11, wherein the mold quality evaluation device includes a mold quality judgment unit that judges the quality of the molded wet sand mold based on a predetermined threshold from the calculated mold strength. A method for evaluating the quality of a casting mold, characterized in that it includes: when the wet sand mold is molded, the portion applied to the contact portion of the wet sand mold sand and the squeeze plate or the squeeze foot placed in the mold molding space The pressure value is measured; and the quality of the molded wet sand mold is evaluated from the pressure value. The mold quality evaluation method according to claim 13, wherein the evaluation of the quality of the wet sand mold includes: calculating from the pressure value based on the relationship between the pressure value and the mold strength of the wet sand mold with the pressure value measured The mold strength of the wet sand mold. The method for evaluating the quality of a casting mold according to claim 14, wherein the evaluation of the quality of the above-mentioned wet sand mold includes: judging the quality of the molded wet sand mold based on the predetermined threshold value from the calculated mold strength.

Images