JPH0683152U - Pressure casting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To enable casting to be completed without waiting for the molten metal to completely drain from the ladle. A photoelectric switch 27 is provided in the vicinity of an opening 26a of a pouring hopper 26 located above the mold 2, and the photoelectric switch 27 detects a temporary meltdown when the ladle 24 completes pouring. Based on the output of the photoelectric switch 27, the cover plate 28 is moved forward to move the pouring hopper 2
6 is closed, and the cover plate 28 receives the molten metal M caused by the subsequent molten metal dripping.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure casting apparatus used in a pressure casting method such as molten metal forging.

[0002]

[Prior art]

 As this type of pressure casting apparatus, there is one having a structure shown in FIG. In this conventional pressure casting apparatus, an upper die (fixed die) 3 that forms a die 2 together with a lower die (movable die) 4 is fixedly supported by a fixed platen portion 1a on an upper portion of a frame 1. On the other hand, the lower mold 4 is fixed to the movable platen 5, and the lower mold 4 moves up and down together with the movable platen 5 in accordance with the expansion and contraction operation of the mold clamping cylinder 6 provided at the lower portion of the frame 1. The mold 2 is clamped and the mold is opened.

The upper mold 3 is provided with a runner part 7 communicating with a product part space R formed between the upper mold 3 and a guide so as to intersect with the runner part 7. The groove 8 is formed. The guide groove 8 is provided with a runner closing plate 10 that slides in the horizontal direction according to the expansion and contraction movement of the cylinder 9. The runner closing plate 10 is provided with a part of the runner portion 7. The auxiliary runner part 11 is formed.

Further, the lower die 4 is formed with a pressure sleeve 25 positioned on the same axis as the runner portion 7, while a pressure plunger 12 is provided at the tip of the piston rod 14 below the pressure sleeve 25. A pressure cylinder 13 connected to the pressure plunger 12 is provided, and the pressure plunger 12 is inserted into the pressure sleeve 25 so that the tip thereof faces the product space R.

On the other hand, a horizontal shaft 16 is integrally keyed to the boss portion 15 of the frame 1, and the boss portion 15 itself is rotatably supported by a support 18 via a bearing 17. At the same time, a two-step type chain sprocket 19 is fixed to the shaft 16.

Further, a motor 20 is provided on the side of the support 18, and two chains are provided between the chain sprocket 22 fixed to the output shaft 21 of the motor 20 and the chain sprocket 19 on the frame 1 side. The chain 23 is wrapped around. Then, by starting the motor 20, the frame 1 can be rotated to an arbitrary position.

Therefore, in the pressure casting apparatus configured as described above, as shown in FIG. 2, the frame 1 is erected so that the runner portion 7 is right above, that is, the mold 2 The mold 1 is clamped, and the frame 1 is positioned in the upright position (upright position) so that the mold opening direction is the vertical direction, and then the upper mold 3 and the lower mold 4 are clamped. Then, the auxiliary runner portion 11 of the runner closing plate 10 is aligned with the runner portion 7, and molten metal is poured from the runner portion 7 to the pressure sleeve 25 by using the tilting ladle 24.

After that, as shown in FIG. 3, the runner closing plate 10 is slid by the operation of the cylinder 9, and the position of the auxiliary runner part 11 is shifted from the runner part 7 to move the runner part 7 to the runner part. After being closed by the closing plate 10, the pressurizing cylinder 12 is moved upward by a predetermined amount by the pressurizing cylinder 13 to fill the molten metal in the pressurizing sleeve 25 into the product space R and pressurize it.

As a result, due to the pressurizing effect in the solidification process of the molten metal, for example, the generation of shrinkage cavities and the adverse effect of residual gas are suppressed, the structure is densified, and a high-quality cast product without casting defects is obtained. Will be done.

After the casting is completed as described above, the motor 1 is started to rotate the frame 1 to an arbitrary position, for example, a position where the frame 1 is substantially horizontal, as shown in FIG. Then, the product W is taken out.

[0011]

In the conventional pressure casting apparatus, as shown in FIG. 2, when the ladle 24 is tilted when pouring, the ladle 24 is rotated to a predetermined rotation angle position. This is based on the fact that a sensor (not shown) detects this and then shifts to pouring after stopping the ladle 24. As described above, the completion of pouring is detected by the tilt angle (rotation angle) of the ladle 24. The molten metal dripping from the ladle 24 may continue for a while.

Therefore, conventionally, when the ladle 24 is rotated up to a predetermined angle, an ON delay timer having a preset melt-out time is activated to prevent the melt from dripping due to the passage of the melt-out time. After that, the casting is started, or when the ladle 24 is rotated to a predetermined angle, the ladle 24 is retracted from directly above the runner portion 7 and then the casting is started.

However, as described above, waiting for the molten metal to drain from the ladle 24, or waiting for the ladle 24 to evacuate from directly above the runner portion 7, the actual pouring of molten metal The time from the completion to the start of casting becomes unnecessarily long, resulting in a decrease in the temperature of the molten metal after pouring, which is not preferable. In addition, melt dripping, especially while waiting for the melt to run out of the ladle 24, means that melts of different temperatures have entered the mold 2, which may affect the quality of the casting. It

Further, for the purpose of removing the molten slag adhering to the runner section 7 and the ladle 24, air is blown to the runner section 7 and the ladle 24 for each shot. There is naturally a limit to the removal of slag. Therefore, while waiting for the molten metal to run out of the ladle 24 as described above, the molten metal slag adhering to the ladle 24 and the runner portion 7 advances into the mold 2 together with the molten metal dripping from the ladle 24. Therefore, the quality of the casting is adversely affected, which is not preferable.

The present invention has been made in view of the above problems, and shortens the time from the completion of pouring to the start of pouring as much as possible, and at the same time, droops from the ladle after completion of pouring. The purpose is to provide a structure that prevents molten metal and molten slag from entering the mold.

[0016]

[Means for Solving the Problems]

 According to the present invention, a mold composed of a fixed upper mold and a movable lower mold is attached to a frame rotatable about a horizontal axis, and the lower mold has an opening / closing direction of the mold. A pressure sleeve was provided in which a pressure plunger that slides in the same direction and faces the product space of the mold was inserted, and the posture of the frame was maintained so that the opening / closing direction of the mold was vertical or almost vertical. In this state, the ladle is used to supply hot water to the pressure sleeve from the runner portion formed on the upper surface of the upper die, and the runner portion is closed by the slide-type runner obstruction plate provided on the upper die. In the pressure casting apparatus in which the molten metal in the pressure sleeve is filled into the product space by the pressure plunger and casting is performed while pressurizing, the opening of the runner part on the anti-product space side is opened. At the edge, the optical axis is perpendicular to the axis of the runner. In addition to installing a photoelectric switch for detecting molten metal breakage of the ladle, a slide opening / closing cover plate that closes the opening on the anti-product space side of the runner part based on the molten metal breakage detection output of this ladle It is characterized by

[0017]

[Action]

 According to this structure, when the molten metal drools from the ladle temporarily after the completion of pouring, that is, after the ladle tilts to the predetermined rotation angle position, the photoelectric switch immediately detects the first molten metal breakage. Detect. Then, in response to the molten metal run-out detection output from the photoelectric switch, the cover plate closes and closes the opening of the runner part on the space opposite the product side.

Therefore, by waiting for the cover plate to block the runner part before shifting to casting, that is, after waiting for the runner part to be closed, the runner block plate is closed and pressure is applied by the pressure plunger. By performing the operation, the molten metal or molten slag that falls due to the subsequent dripping of molten metal from the ladle is received by the cover plate, and therefore does not enter the mold.

As a result, it becomes possible to immediately shift to the casting after the completion of the pouring, without waiting for the molten metal dripping from the ladle to be completely eliminated.

[0020]

【Example】

 1 (A) and 1 (B) are views showing an embodiment of the present invention, and the same parts as those of the conventional example shown in FIG.

As shown in FIG. 1, a fixed platen portion 1 a of the frame 1 to which the upper die 3 is fixed is provided with a hopper 26 for pouring so as to be continuous with the runner portion 7 on the upper die 3 side. The pouring is performed using the ladle 24 from the opening 26a side of the pouring hopper 26.

On the fixed platen portion 1a, a light projector 27a and a light receiver 27b of a transmissive photoelectric switch 27 are provided so as to face each other with the pouring hopper 26 interposed therebetween. This photoelectric switch 27 is for detecting the melt shortage from the ladle 24 when the pouring is completed by the ladle 24. The optical axis a of the photoelectric switch 27 is orthogonal to the axis of the pouring hopper 26. It is set.

A cover plate 28 for opening and closing the opening 26a of the pouring hopper 26 is provided on the fixed platen portion 1a. The cover plate 28 is connected to a piston rod 30 of a cylinder 29, which is also fixed on the fixed platen portion 1a, via an adapter 31 and a mounting bolt 32, and the pouring is performed according to the expansion and contraction operation of the cylinder 29. The hopper 26 is slid between the position where the opening 26a is released and the position where the opening 26a is closed.

Therefore, in the pressure casting apparatus configured as described above, under the condition that the frame 1 is in the upright position and the mold 2 is clamped, the tilting type is the same as the conventional one. Using the ladle 24, the pouring is performed from the opening 26a of the pouring hopper 26. At this time, the runner closing plate 10 shown in FIG. 2 opens the runner section 7, while the cover plate 28 shown in FIG. 1B also opens the pouring hopper 26.

That is, as shown in FIG. 1, while gradually inclining the ladle 24 positioned above the fixed platen portion 1 a of the frame 1, pouring is performed through the pouring hopper 26, and the ladle 24 is moved to a predetermined tilt position. When tilting to the (rotation angle position), pouring is completed and the ladle 24 is stopped. Then, even after the tilting of the ladle 24 is stopped, the molten metal M flows out from the ladle 24 for a while and the molten metal dripping is caused, and the molten metal dripping is gradually interrupted.

On the other hand, the photoelectric switch 27 monitors the molten metal M flowing out of the ladle 24 at the same time when the pouring is started, and if the molten metal M is temporarily interrupted after the tilting operation of the ladle 24 is stopped as described above, The photoelectric switch 27 detects the first molten metal breakage from the ladle 24.

It should be noted that the photoelectric switch 27 described above is enabled only from the start of pouring to the detection of the first molten metal breakage, and is otherwise disabled. This is because if the photoelectric switch 27 is always enabled, there is a risk of erroneous detection due to dust or foreign matter.

When the photoelectric switch 27 detects the molten metal out of the ladle 24 as described above, the cylinder 29 extends in response to the detection output of the photoelectric switch 27, and the cover plate 28 is directly above the pouring hopper 26. The cover plate 28 closes the opening 26a of the pouring hopper 26.

Furthermore, as described above, the pouring hopper 26 waits until it is closed by the cover plate 28, and immediately shifts to casting. That is, when the pouring hopper 26 is closed by the cover plate 28, the runner closing plate 10 shown in FIG. 2 closes the runner portion 7, and the pressurizing plunger 12 pressurizes and pressurizes. The molten metal M in the sleeve 25 is filled in the product part space R and then pressurized.

Therefore, even if molten metal drips from the ladle 24 after the cover plate 28 closes the pouring hopper 26, the dripping molten metal M is received by the cover plate 28 and collected. Therefore, the molten metal M does not enter the mold 2, and even if the molten slag attached to the ladle 24 drops together with the molten metal M, it does not enter the mold 2. .

It should be noted that, when the product is taken out after the completion of the casting, the mold is opened after rotating the frame 1 to a substantially horizontal position, which is the same as the conventional case.

[0032]

[Effect of device]

 As described above, according to the present invention, the photoelectric switch for detecting the molten metal shortage from the ladle immediately after the pouring is completed is provided, and based on the molten metal shortage detection output of the photoelectric switch, the side of the runner portion opposite the product space By providing a cover plate that closes the opening of the, it is possible to shift to pouring without waiting for the molten metal drooping from the ladle to completely disappear, so the time from the completion of pouring to the start of pouring is conventionally It can be made shorter than the above, which can contribute to the improvement of casting quality by minimizing the temperature drop of the molten metal in the mold.

Further, unlike the conventional case, the molten metal generated by the molten metal dripping from the ladle does not fall into the mold forever, and the intrusion of the molten slag can be suppressed to the minimum. In addition, casting quality is improved.

[Brief description of drawings]

1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is a configuration explanatory view of a main part, and FIG. 1B is a right side explanatory view of FIG.

FIG. 2 is a view showing an example of a conventional pressure casting apparatus, and a cross-sectional explanatory view at the time of pouring molten metal.

FIG. 3 is an explanatory cross-sectional view when the pressure plunger performs a pressure operation from the state of FIG.

FIG. 4 is an explanatory cross-sectional view when the mold is opened from the state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 1a ... Fixed platen part 2 ... Mold 3 ... Upper mold 4 ... Lower mold 7 ... Runner part 12 ... Pressurizing plunger 24 ... Ladle 25 ... Pressurizing sleeve 26 ... Pouring hopper 26a ... Opening 27 ... Photoelectric switch 28 ... Cover plate 29 ... Cylinder M ... Molten metal R ... Product space

Claims (1)

[Scope of utility model registration request] 1. A mold comprising a fixed upper mold and a movable lower mold is attached to a frame rotatable about a horizontal shaft, and the lower mold has an opening / closing direction of the mold. Provide a pressure sleeve in which a pressure plunger that slides in the same direction as the mold and faces the product space of the mold is inserted, and holds the attitude of the frame so that the opening / closing direction of the mold is vertical or almost vertical. In this state, hot water is supplied to the pressure sleeve using a ladle from the runner portion formed on the upper surface side of the upper die, and then the runner portion is closed by the slide-type runner closing plate provided on the upper die. In a pressure casting apparatus that is closed and fills the molten metal in the pressure sleeve into a product part space by a pressure plunger and performs casting while pressurizing, the opening edge of the runner part on the anti-product part space side Part, the optical axis is perpendicular to the axis of the runner part. In addition to installing a photoelectric switch for detecting molten metal breakage of the ladle, a slide opening / closing type cover plate that closes the opening of the runner part on the space side of the anti-product part based on the output of molten metal detection A pressure casting device.