JPH012758A - Casting mold equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A3 Object of the Invention (1) Industrial Field of Application The present invention relates to a casting mold device, and in particular, a mold device that is slidably fitted into a chimney insertion hole penetrating the mold and has an inner end surface. This invention relates to a casting mold device having a chimney that abuts a shell core inside the mold.

(2) Conventional technology It has been known that when molten metal is poured into a casting mold in which a shell core is placed, the resin that is the binder of the shell sand burns and vaporized gas is generated. There is. If this vaporized gas is not properly discharged from inside the mold, it will cause product defects.

Therefore, it is known that a mold is provided with a chimney insertion hole that communicates the inside and outside of the mold, and the inner end surface of the chimney that is slidably fitted into the chimney insertion hole is brought into contact with the shell core. ing. It is configured like this. : Due to this, the vaporized gas generated in the shell core during pouring is released to the outside through the chimney.

(3) Problems to be Solved by the Invention The vaporized gas generated in the shell core is cooled as it approaches the outlet at the outer end while passing through the chimney.

It then becomes a tar-like mass that adheres to the inside of the chimney.

When the resin-like lumps accumulate on the inner surface of the chimney and clog the chimney, there is no place for the vaporized gas to escape. Then,
Vaporized gas remains in the cavity 1, resulting in defective cast products. In order to prevent the occurrence of such defective cast products, it has conventionally been necessary to replace the chimney every time 20 to 30 cast products are cast. Each time the chimney is replaced, it is necessary to perform troublesome work such as unloading the mold from the machining center, mounting it on the machining center, or replacing the chimney itself.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent the resin-like lump from accumulating in the chimney whose inner end surface comes into contact with the shell core inside the mold.

B1 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the casting mold device of the present invention is slidably fitted into a chimney insertion hole penetrating the mold, and A casting mold device having a chimney whose inner end surface abuts against a soel core inside the mold is characterized in that an air blowing device is provided for blowing compressed air into the chimney from the outer end of the chimney.

(2) Effect The casting mold device of the present invention having the above-described configuration blows compressed air from the outer end of the chimney using the air blowing device, thereby blowing away the resin-like lumps that have adhered to the inside of the chimney. and removed. Therefore, the resin-like mass does not accumulate in the chimney.

(3) Embodiment Hereinafter, an embodiment of a casting mold apparatus according to the present invention will be described with reference to the drawings. 1 and 2, a stalk support through hole 1a is formed in a substrate l of a machining center.

A crucible 2 is disposed on the lower surface of the substrate 1, and the crucible 2 is formed with an air supply port 2a and a pressure gate (not shown). This crucible 2 contains molten aluminum 3 at a temperature of about 710°C.

A stalk (hot water pipe) is installed in the stalk support through hole 1a.
4 is passed through and supported. A lower mold 5 is disposed on the upper surface of the substrate 1. The lower mold 5 is formed with a cavity recess 5a and a sprue 5b that communicates the cavity recess 5a with the stalk 4. A shell core 6 is arranged within this cavity recess 5a. The shell core 6 is composed of a lower core 6a placed on the bottom surface of the cavity recess 5a, and an upper core 6b supported by the upper outer peripheral surface of the four cavity portions 5a.

Above the lower mold 5, an upper mold 8 coupled to the lower surface of the Guiset 7 is disposed so as to be able to move into and out of contact with the lower mold 5.These lower molds 5 and upper molds 8 constitutes a mold K. This upper mold 8 is formed with a plurality of chimney insertion holes 8a, 8a and pin insertion holes 8b, 8b that vertically penetrate this upper mold 8. Chimney insertion holes 8a, 8
Chimneys 9 and 10 are slidably fitted into the chimneys a. The chimney 9 is provided with a flange portion 9a at its upper end, and the flange portion 9a engages with the upper surface of the upper mold 8 to prevent it from falling downward. The chimney 10 is also provided with a flange portion 10a similar to the flange portion 9a at its upper end. The lower end surface of the chimney 9 is in contact with the upper surface of the upper core 6b in the mold closed state shown in FIG. In addition, the lower end surface of the chimney 10 is connected to the upper core 6
b and is in contact with the upper surface of the lower core 6a. Therefore, in the state shown in FIG. 2, the vaporized gas generated in the upper core 6b is discharged to the outside through the chimney 9, and the vaporized gas generated in the lower core 6a is discharged to the outside through the chimney 10. It looks like this.

An extrusion plate 12 supported by a plurality of springs 11 is disposed above the upper mold 8 .

This extrusion plate 12 is provided with air ejection holes 12a, 12a corresponding to the positions of the chimney insertion holes 8a, 8a. That is, the center lines of these air jet holes 12a, 12a are arranged so as to coincide with the center lines of the chimney insertion holes 8a, 8a. Therefore, when the extrusion plate 12 approaches the upper mold 8, the air jet holes 12a, 12a are arranged so as to come into contact with or be close to the chimneys 9, 10 that fit into the chimney insertion holes 8a, 8a. has been done. A plurality of extrusion bottles 13, 13 are provided on the lower surface of the extrusion plate 12 to project downward. This push-out pin 13.13 is inserted into the pin insertion hole 8b, Bb.

1 and 2 in which the spring 11 is extended.
In the state shown in the figure, the lower end surface of the extrusion pins 13 and 13 is set flush with the lower surface of the upper mold 8. Further, a manifold 14 is disposed on the upper surface of the extrusion plate 12, and an air chamber 15 is formed by the manifold 14 and the upper surface of the extrusion plate 12. And this air chamber 1
A hose 16 is connected to the inside of the hose 16.
An air source 18 is connected to the air source 18 via a solenoid valve 17. The solenoid pulp 17 connects the air source 18 to the hose 1 for a predetermined time set in a timer 19.
6. While the air source 18 and the hose 16 are in communication, the air thus supplied from the air source 18 passes through the hose 16 and the air chamber 15, and is ejected from the air ejection holes 12a, 12a. ing. The air supply device 20 is constituted by the components indicated by the aforementioned reference numerals 12a and 14-19.

Further, a knockout 21 is provided above the extrusion plate 12 for pressing the extrusion plate 12 onto the upper surface of the upper mold 8. This knockout 21 is arranged to be driven in the vertical direction, and moves downward to push out the extrusion plate 1.
When 2 is pressed, the air jet holes 12a, 12a and the chimney 9. 10 are in contact with or close to each other.

Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.

When the upper mold 8 and the lower mold 5 are closed as shown in FIG. 2, a cavity C is formed.

A release agent is applied to the surfaces of the lower mold 5 and upper mold 8 that form this cavity C, but the lower mold 5
The mold release agent is selected so that the product can be released more easily from the mold release agent applied to the upper mold 8 than from the mold release agent applied to the upper mold 8. Therefore, when the mold is opened after casting, the cast product adheres to the upper mold 8 and is released from the lower mold 5.

In the mold closed state shown in FIG. 2, when air at an air pressure of about 0.2 to 0.4 kg/crA is supplied from the air supply port 2a of the crucible 2, the aluminum melt 7i 3 will melt the stalk 4. and fills cavity C. While the aluminum alloy 3 is filled into the cavity C and solidified, vaporized gas is generated from the binder resin or oil of the shell core 6. This vaporized gas goes into the chimney 9.
Emitted from 10.

This vaporized gas is cooled as it passes through the chimney 9.10 and becomes a resin-like mass. Adheres to the inner surface of IO.

When the mold is opened after the molten aluminum 3 in the cavity C has solidified, the cast product adheres to the upper mold 8 and is released from the lower mold 5. Next, when the extrusion plate 12 is pressed by the knockout 21, the extrusion plate 12 approaches the upper mold 8 while pressing the spring 11. At this time, the cast product is released from the upper mold 8 by the extrusion pin 13°13.

When the extrusion plate 12 is further pressed by the knockout 21 and the extrusion plate 12 is brought into contact with or close to the upper surface of the upper mold 8, the air jet holes 12a, 12a are brought into contact with or close to the upper end of the chimney 9.10. In this state, the timer 19 is operated for a predetermined period of time, and the solenoid valve 17 is opened for the predetermined period of time during which the timer 19 is activated. While this solenoid valve 17 is open, 5 kg/C11
Compressed air having an air pressure of about 1 is supplied. The air supplied to this air chamber 15 is
2a into the chimney 9.10. At this time,
Chimney9. The resin-like mass adhering to the inside of 1O is blown off and removed. Next, after a predetermined time set by the timer 19 has elapsed and the solenoid valve 17 is closed, the knockout 21 is returned to its original position, and the push-out plate 12 is returned to its original position by the action of the spring 11.

Although the embodiments of the casting mold apparatus according to the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments.
Various design changes can be made without departing from the scope of the invention as set forth in the claims.

For example, instead of using the timer 19 and the solenoid valve 17, it is possible to use a manually actuated valve, and it is also possible to attach an air jet pipe to the air jet holes 12a, 12a and connect the lower end of the air jet pipe. The chimney 9
．． It is also possible to configure it so that it comes into contact with the upper end of 10. Furthermore, when closing or opening the mold, it is also possible to move the lower mold instead of moving the upper mold.

Effects of the C0 Invention According to the above-described casting mold device of the present invention, the resin-like mass that adheres to the inside of the chimney when the vaporized gas is cooled is blown away by air and removed, so that the resin-like mass is removed from the chimney. not accumulated within the body. Therefore, a large number of cast products can be continuously cast without replacing the chimney, which eliminates the need for chimney replacement work and improves work efficiency.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of an embodiment of a casting mold apparatus according to the present invention in a mold open state, and FIG. 2 is a front sectional view of the same embodiment in a mold closed state.

Claims (1)

[Claims] A casting having a chimney (9, 10) that slidably fits into the chimney insertion hole (8a, 8a) penetrating the mold (K) and whose inner end surface abuts the shell core (6) inside the mold. A casting mold apparatus characterized in that an air blowing device (20) is provided for blowing compressed air into the chimney (9, 10) from the outer end of the chimney (9, 10).