JPH0347724Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] In die casting, in which molten metal is injected into a mold formed by upper and lower molds, in order to obtain a high-quality cast product, it is necessary to The present invention relates to a device for preheating a mold used in mold casting.

[Prior art]

As shown in FIGS. 9 and 10, a conventional mold preheating device 1 of this type includes an air amount adjusting section 4A in a burner body 4 provided with a plurality of burner chips 2 around the outer periphery. A gas hose 6 is connected through the burner tip 2, and flame is injected from the burner tip 2 to heat the mold. The burner body 4 is provided with a pair of stands 8, and as shown in FIG.
It can be placed on top of B. Note that the first
Figure 1 shows the main structure of the casting machine, with the lower mold 12
An upper die 12A is provided vertically opposite to B, and this upper die 12A is fixed to an upper die base 14A that is vertically slidable. Further, reference numeral 14B is a lower die base.

[Problem that the invention attempts to solve]

As shown in FIGS. 9 to 11, the conventional preheating device is a gas burner type, and the molds 12A and 12B are
It was difficult to adjust the amount of heat supplied to the Generally, in low-pressure casting, it is necessary to heat the upper mold 12A to 200 to 300°C and the lower mold to 300 to 450°C, but with conventional preheating equipment, the upper mold 12A and the lower mold 1
2B cannot be heated to an appropriate temperature, resulting in defective products and poor operating efficiency. In addition, the flame and exhaust gas injected from the burner tip 2 are not recovered and spread around, which not only causes problems of poor thermal efficiency and increases energy costs, but also worsens the working environment. There was also a risk that various equipment would malfunction due to the heat. Furthermore, there are various dangers such as gas leakage due to misfire or gas explosion due to this. Furthermore, molds 12A and 12B
The operator had to hold the burner body 4 each time to insert or remove the preheating device 1 into or out of the burner, resulting in a problem of very poor workability.

The present invention was devised in view of the problems of the prior art, and its purpose is to replace the conventional gas bar with poor thermal efficiency.
It is an object of the present invention to provide a mold preheating device for mold casting with good thermal efficiency by adopting an electric heating type instead of a four-way type.

[Means for solving problems]

The mold preheating device for mold casting according to the present invention has a heating part for heating the mold, and is configured to be able to be put in and taken out between upper and lower molds, wherein the heating part is An insulating container with a cylindrical frame structure with an open upper and lower surface, an electric heating element as a heating source, an end surface that accommodates this heating element and can be brought into close contact with opposing matching surfaces of upper and lower molds at the same time. It is characterized by being comprised of the following.

[Effect]

The heating parts are in close contact with the opposing matching surfaces of the upper and lower molds, and the space area around the electric heating element between the upper and lower molds is kept in a substantially airtight state from the outside space by the heat insulating container. , the heat of the heating element is efficiently transferred to the mold.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

1 and 2 show a first embodiment of the present invention, and in these figures, the mold preheating device includes a heating section 20 and a coil spring 27 connecting the heating section 20.
The carriage 30 is supported from below by a carriage 30.

The heating unit 20 includes a cylindrical heat-insulating container 22 with open upper and lower surfaces, and a plurality of ceramic heaters 23 arranged in parallel at predetermined intervals within the container 22.
It is composed of. Upper end surface 2 of the heat insulating container 22
2A and the lower end surface 22B are respectively cast by a casting machine (fourth
(see figure) is formed in a shape that matches the opposing matching surfaces of the upper mold 55 and the lower mold 45, and as the upper mold 55 descends, the lower end surface 55A of the upper mold 55
The upper end surface 22A of the heat insulating container 22, the upper end surface 45A of the lower mold 45, and the lower end surface 22B of the heat insulating container 22 fit into each other. The ceramic heater 23 is a heating element made by sintering a conductive material and a ceramic material at high temperature and has a cylindrical shape. A heating amount adjusting plate 24 is provided. This heating amount adjusting plate 24 can be installed at a predetermined position in the left and right direction in FIG. It is now possible to change. That is, in a low-pressure mold casting machine as shown in FIG. 4, it is necessary to reduce the amount of heating of the upper mold 55 compared to the lower mold 45, and the heating adjustment plate 24 is placed at the position shown in FIG. This is done so that the amount of heating above the heating section 20 is smaller than that below.

The reference numeral 26 is a terminal cover of the ceramic heater 23, and the reference numeral 25 is a power supply cable connected to the control panel 6.
The control panel 60 can adjust the amount of heat generated in the heating section 20 by increasing or decreasing the current supplied to the ceramic heater 23 by changing the taps of the transformer. .

As shown in FIG. 3, the truck 30 that supports the heating section 20 from below includes a truck frame 32 formed in a U-shape in plan with an open front portion 32A;
It consists of vertical rods 34 projecting upward from the four corners of the frame 32, and wheels 36 provided on the outside of the truck frame 32. A flange 28 is provided at the corner of the heat insulating container 22 of the heating section 20.
is provided protrudingly, and a rod through hole 28A is bored in this flange 28. The rod 34 is installed through the hole 28A of the flange 28,
A spring 27 is inserted between the flange 28 and the truck frame 32 with the rod 34 inserted inside.
is interposed, and vertical movement of the heating unit 20 is permitted. The trolley 30 is configured to run on a pair of horizontally extending rails 38 (see FIG. 4) sandwiching the lower mold 45.
and the rail 38 constitute a mechanism for carrying the mold preheating device into and out between the upper and lower molds 45 and 55.

FIG. 4 shows a front view of the preheater according to this embodiment installed in a mold casting machine, and in this figure, a lower die base 44 is installed horizontally via legs 42, and A lower mold 45 is fixed on a mold die base 44. Four tie bars 46 with an upper frame 48 extending vertically in parallel with the lower die base 44
An upper die base 54 is supported by a hydraulic cylinder 52 fixed to the upper frame 48, and an upper die 55 is fixed to this upper die base 54. The lower mold 45 and the upper mold 55 are arranged to face each other in the vertical direction, and their opposing surfaces 45A and 55A are formed in a shape that meshes with each other. The upper mold 55 and the lower mold 45 are provided with temperature sensors 58 and 59 for detecting the temperature of each mold, and the temperature of the mold detected by these temperature sensors 58 and 59 is is output to the control panel 60.

Next, the procedure for heating the mold of a casting machine using the mold preheating device according to this embodiment is shown in FIGS. 4 and 5.
This will be explained based on the diagram.

First, as shown in FIG. 4, the cylinder 52 is operated to raise the upper mold 55 and the upper and lower molds 4
Secure a space between 5 and 55 where the mold preheating device can fit. At the same time, the position of the heating amount adjusting plate 24 in the heating section 20 is determined in accordance with a predetermined heating pattern, and the heating adjusting plate 24 is fixed at that position. Next, the cart 30 is advanced and stopped in the space between the upper and lower molds 45 and 55. This stopping position is the mold 45,
The upper and lower end surfaces 45A, 55A of 55 are the insulation container 22
It is desirable to stop it at a position that substantially aligns with the upper and lower end surfaces of. Next, when the cylinder 52 is operated and the upper mold 55 is lowered, the upper end surface 2 of the heat insulating container 22 is
The lower end surface 55A of the upper mold 55 is completely fitted into the upper mold 2A. When the upper mold 55 is further lowered, the heating part 20 is pushed downward against the biasing force of the spring 27, and the lower end surface 22B of the heat insulating container 22 fits into the upper end surface 45A of the lower mold 45. This state is shown in FIG.
5 and the lower mold 45 are located, and the insulation container 2
2, it is in a sealed state and is reliably isolated from the outside space. In this state, the ceramic heater 23 is turned on by a predetermined amount of heat, and the upper and lower molds 45,
Preheating of the molds 45 and 55 is completed by heating the molds 55 and stopping the power supply when the temperature detected by the temperature sensors 58 and 59 reaches a predetermined temperature.

When the preheating process is completed, the cylinder 52 is operated to raise the upper mold 55 to a position where it does not interfere with the removal of the preheating device, as shown by the solid line in FIG.
Then, the preheating device is moved back to the original standby position.

According to this embodiment, the following effects are achieved.

In addition to using an electric heating type as a heating source, the mold 4 is controlled by a control panel 60 and a heating adjustment plate 24.
Since it is possible to adjust the heating amount to 5 and 55, it is superior in safety because there is no danger of various harms caused by exhaust gas or gas leaks as in conventional technology, and it is also possible to adjust the heating amount appropriately to make the work easier. can significantly improve performance.

Since the ceramic heater 23 with excellent heat resistance is used as the heat source, the heater 23 can be used at a high temperature, and the preheating process can be completed in a correspondingly short time.

The space between the upper and lower molds 45 and 55 is a heat insulating container 2
2, the thermal efficiency is high and energy costs can be significantly reduced.

Since the preheating device is carried in and out between the upper and lower molds 45 and 55 using the trolley 30 and guide rails 38, it can be moved smoothly and has excellent workability. It has become a common thing.

FIG. 6 shows the main part of another embodiment of the present invention.

In the first embodiment, the cart frame 32 is configured in a U-shape in plan, but this embodiment is characterized in that the cart frame 62 has a framework structure having an opening 62A in the center. There is this space 62A
is formed in a size large enough to allow the heating section 20 supported above the truck to be fully inserted in the vertical direction. Further, in the first embodiment, the rail for running the bogie is
Although the rail 38 is provided at a position below the upper end surface of the lower mold 45, in this embodiment, the rail 68 is provided at a position above the upper end surface 45A of the lower mold 45. Since the other parts are the same as those in the first embodiment, the same reference numerals are given and the explanation thereof will be omitted.

In this embodiment, the lowering of the upper mold 55 causes the heating part 2 to
0 is also pushed down by the upper mold, and the heating part 20 descends through the central space 62A formed in the truck frame 62 and engages with the upper end surface 45A of the lower mold.

According to this embodiment, since the truck frame 62 has a frame structure with a rectangular outer shape, the structure is superior in structural strength compared to the first embodiment.

[Effect of idea]

As is clear from the above explanation, according to the present invention, a mold preheating device with extremely good thermal efficiency can be obtained.
By using the present invention, mold preheating work can be performed safely and easily.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the first embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, and Fig. 4 shows a casting machine related to this embodiment. FIG. 5 is a front view of the casting machine showing the state during mold preheating; FIG. 6 is a front view of main parts of another embodiment of the present invention; FIG. 7 8 is a front view of the mold preheating device according to the second embodiment installed in the casting machine, FIG. 9 is a front view of the conventional mold preheating device, and FIG. 10 is a front view of the conventional mold preheating device. Its side view, FIG. 11, is a usage state diagram of the conventional mold preheating device. 20...Heating section, 22...Insulating container, 23...
Ceramic heater, 24... Heating adjustment plate, 27...
...Spring, 30...Dolly, 32, 62...Dolly frame, 32A, 62A...Opening, 34...
... Vertical rod, 36 ... Wheel, 38 ... Guide rail, 45 ... Lower mold, 55 ... Upper mold, 60 ...
…control panel.

Claims (1)

[Claims for Utility Model Registration] (1) In a mold preheating device that has a heating part for heating a mold used in mold casting and is configured to be put in and taken out between upper and lower molds, The section has a cylindrical frame structure with an open top and bottom surface, which has an electric heating element as a heating source, an end surface that accommodates this heating element inside and can be brought into close contact with the opposing matching surfaces of the upper and lower molds at the same time. A mold preheating device for mold casting, characterized by comprising: a heat insulating container; and a heat insulating container. (2) A pair of guide rails extends between the upper and lower molds, and the heating section is supported by a cart that can move along the guide rails so that it can move in and out between the upper and lower molds. A mold preheating device for mold casting according to claim 1, which is characterized in that: (3) The heating unit is allowed to move in the vertical direction by an elastic member such as a spring interposed between the heating unit and the trolley, as set forth in claim 2 of the utility model registration claim. Mold preheating device in mold casting.