JPH04200998A - Device for supplying material in wet-type powder compacting apparatus - Google Patents

Abstract

PURPOSE:To prevent blow-out of material at the time of knocking out and to improve quality of a product by providing a material supplying passage, which penetrates a device body and has a valve on the way, and providing a shifting body for varying space vol. in an outlet side passage, into the outlet side passage. CONSTITUTION:In a device body 23, the material supplying passage 26 having an inlet for material and the outlet for material and the valve 27 on the way, and the shifting body 48 arranged as possible to inert/retreat into the outlet side passage and varying the space vol. in the outlet side passage, are provided. Even if high pressure is remained in an intermediate passage at the time of compacting, the shifting body is operated to the pulling-out direction from the outlet side passage before knocking out to increase the space vol. in the outlet side passage, and inner pressure is lowered to the prescribed value. Under this condition, by executing the knock-out, the material is not blown out to the outer part and sticking of the material on surface of a frame mold and the product is prevented, and trouble of cleaning is eliminated and the quality of product is improved.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a wet powder molding apparatus that compresses and dehydrates a slurry powder material using a mold to form an electronic component molded product. This invention relates to a material supply device that supplies materials into the interior.

[Conventional technology]

A conventional example of this type of material supply device will be explained with reference to FIGS. 4, 5, and 6.

In Fig. 4, 2 is the frame of the wet powder compacting device;
1 is a frame mold fixed on the frame 2, 6 is a lower mold supported so that it can be raised and lowered inside the frame, 8 is a 2-mold mold, and 10 is a water removal medium for removing water during the compression dehydration process. , a lower mold 6, an upper mold 8, and a frame mold 4 form a cavity 12.

The frame 4 has a supply path 14 leading to the outside and a cavity 1.
A supply groove 16 communicating with 2 is also provided.

The upper mold 8 and the lower mold 6 are raised and lowered by a known lifting mechanism 18, 20, such as a hydraulic solinter or a crank mechanism.

22 is a material supply device, which passes through the device main body 23,
It has a material intake 24 and a material outlet 25, and an on-off valve 2 in the middle.
A material supply path 26 having 7 is provided. Open/close valve 27
consists of a valve body 28 and a valve seat 29, and the material supply path 26 includes an inlet side path 30 between the on-off valve 27 and the material outlet 24, and an outlet side path 31 between the on-off valve 27 and the material outlet 25. It consists of

The valve element 28 of the on-off valve 27 is operated by a hydraulic cylinder 34 to open and close the valve seat 30.

The device main body 23 is attached directly to the side surface of the frame mold 4 and communicates with the material outlet 25 or the supply path 14. 3
8 is a material supply pipe, which communicates with the material port 24.

In the molding operation, first, a slurry-like powder material is supplied from the material supply pipe 38 and filled into the cavity 12. Thereafter, the lifting mechanism 20 is operated to raise the lower mold 6, and as shown in FIG. 5, the material in the gear upper tee 12 is compressed and dewatered through the water removal medium 10.

The molded product 40 that has been molded after compression dehydration is ``2 type 8''
As shown in FIG. 6, the lower mold 6 is further raised to perform a knock-down I~ and to be taken out.

[Problem to be solved by the invention]

However, such conventional devices have the following problems.

That is, during the molding operation, if the lower mold 6 is raised by 1" after closing the on-off valve 27 from the state shown in FIG. 4, the pressure of the material in the cavity 12 will increase, but
1. Since the interior of the intermediate path 42 consisting of the supply path 14 and the supply groove 16 also communicates with the cavity 12, the internal pressure increases.

After that, the lower mold 6 rises, and as shown in FIG.
Even after being cut off from capacity 6 or 12, intermediate route 42
High pressure remains inside. Due to this residual high pressure, when the molded product 40 is knocked out, as shown in FIG. This has the drawback of causing problems such as adhesion, requiring time and effort for cleaning, or impairing the quality of the product.

The present invention solves the problem of eliminating these drawbacks of the conventional ones, and provides a wet powder that does not cause material to blow out during knockout, does not require the effort of cleaning, and does not impair product quality. The object of the present invention is to provide a material supply device for a molding device.

[Means to solve the problem]

The present invention provides a material supply device for supplying the material to the cavity of a wet powder molding device that compresses and dehydrates a slurry powder material filled in the cavity of a mold to form a molded product. A material supply path is provided that penetrates through the main body and has a material inlet and a material outlet, and has an on-off valve in the middle, and is capable of appearing in and out of the outlet side path that is the material supply path between the on-off valve and the material outlet. This is a material supply device for a wet powder molding apparatus, characterized in that it is provided with a retractable body that increases or decreases the volume of a space in the exit side path.

[For production]

Since the present invention is configured as described above, even if high pressure remains in the intermediate path during molding, the space in the exit path is cleared by operating the projecting body in the direction of pulling it out from the exit path before knocking out. The volume (ie, the volume of the space in the intermediate path) is increased and the internal pressure is reduced to a predetermined value. If the knockout is performed in this state, the material will not blow out to the outside, and it will prevent the material from adhering to the frame surface or molded product, saving the effort of cleaning and improving the quality of the product. I can do something.

〔Example〕

Embodiments of the present invention will be explained using FIGS. 1, 2, and 3. Portions with the same reference numerals as in FIGS. 4, 5, and 6 have similar configurations and functions, so explanations will be omitted.

In FIG. 1, reference numeral 48 denotes a retractable body formed by a mouth rad that is operated to retract and retract into the outlet path 31 by a hydraulic cylinder 50.
It is designed to reduce or increase the volume of the space inside. 52 is a spring.

During the molding work, the projecting body 48 is moved into a hydraulic cylinder 50.
As shown in FIG. 1, the material is filled into the cavity 12 with the material protruding into the outlet path 31. after that,
The hydraulic cylinder 34 is operated to close the on-off valve 27 and the lower mold 6 is raised to compress the material in the cavity 12 and dewater it through the water removal medium 10. When the lower mold 6 rises and the supply groove 16 is cut off from the cavity 12 as shown in FIG. 2, high pressure remains in the intermediate path 42.

Before performing the knockout, as shown in FIG. After the internal pressure of
This prevents the material from blowing out from the mold 2 and prevents the material from adhering to the upper surface of the frame 4 and the molded product 40.

When the appearing body 48 moves in the disappearing direction, as shown in FIG.
A portion thereof may remain within the intermediate channel 42, or it may be completely buried.

The hydraulic cylinder 50 may be hydraulically operated in both the protruding and retracting directions, and one side may be operated by a spring and the other side may be hydraulically operated. Further, the projecting direction may be hydraulically operated, and the projecting and retracting body 48 may be pushed in using the high pressure of the intermediate path 42 in the retracting direction.

The hydraulic cylinder 34 for the on-off valve 27 may be hydraulically operated in both opening and closing directions, and one side may be operated by a spring and the other side may be hydraulically operated. In addition, it may be provided with only the spring 36 and serve as a simple check valve, or it may further include a chamber on the opposite side of the spring 36 (the first
It may also be used as a pilot operated check valve by introducing pilot pressure into the chamber below the piston (in the figure).

In place of the hydraulic cylinders 50 and 34, mechanical drive means using a crank, cam, rack, etc., or electric drive means using a solenoid, etc. may be used.

The material supply device according to the present invention is preferably attached directly to the mold (the frame mold 4 in the above embodiment) without using a hose or a pipe. By doing so, it is possible to prevent loss of pressure transmission between materials and generation of residual pressure due to bulges in the hose.

〔Effect of the invention〕

In the present invention, by providing a projecting body in the material supply path and activating the projecting body when taking out the molded product after molding, it is possible to prevent the material from blowing out at the time of knocking out, and to prevent the material from blowing out on the upper surface of the frame mold or the molded product. It is possible to prevent materials from adhering, save time on cleaning, and improve product quality.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a material supply state according to an embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view of the compressor during compression work. FIG. 3 is a longitudinal sectional view of the knockout state. FIG. 4 is a longitudinal sectional view of a conventional material supply state. FIG. 5 is a longitudinal cross-sectional view of the compressor during compression work. FIG. 6 is a longitudinal sectional view of the knockout state. Explanation of symbols 4 Frame mold 6 Lower mold 8 Upper mold 12 Cavity 22 Material supply device 23 Device main body 26 Material supply path 27 Opening/closing valve 31...Outlet side route 42...Intermediate route 48...Intruding object

Claims (3)

[Claims] (1) In a material supply device that supplies the material to a cavity of a wet powder molding device that compresses and dehydrates a slurry powder material filled in a cavity of a mold to form a molded product, the material is supplied to the device body. A material supply path that penetrates through and has a material inlet and a material outlet, and has an on-off valve in the middle, and is provided so as to be able to appear in and out of the outlet side path that is the material supply path between the on-off valve and the material outlet. 1. A material supply device for a wet powder compacting apparatus, characterized in that the material supply device is provided with a retractable body that increases or decreases the volume of the space in the exit side path. (2) The material supply device according to claim 1, wherein the projecting and retracting body is a rod operated by a hydraulic cylinder. (3) The material supply device according to claim 1, wherein the on-off valve is a valve operated by a hydraulic cylinder.