JPH0533005A - Dry cold isotropic pressing device - Google Patents

Abstract

PURPOSE:To subject a body to be treated to cold isotropic pressing without harmful effect such as ununiformity in internal stress on the body and to easily take out the body after the pressing. CONSTITUTION:A venthole 17 for the open air is pierced in an upper lid 5 so that it communicates with the underside 20 of the lid 5. A valve body 21 is freely detachably fitted to the under side 20 of the lid 5 and a gap (e) through which air can circulate is kept between the valve body 21 and the inner circumferential surface of a rubber mold 3 for compacting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry cold isostatic pressing device (hereinafter referred to as a dry CIP device), which is used in the field of ceramics molding and powder metallurgy.

[0002]

2. Description of the Related Art Conventional CIP devices are roughly classified into a wet method (wet bag method) and a dry method (dry bag method). Among them, the dry method is
It is a method of pressure molding through a rubber mold that has been built into the pressure vessel beforehand, and powder filling, pressurization, and removal of molded products can be performed without touching the liquid, so automation is easy and suitable for mass production. It is supposed to be.

FIG. 7 shows a conventional example of such a dry CIP device. In the figure, reference numeral 32 is a cylindrical molding container, and a cylindrical molding rubber mold 34 is provided inside the container through a pressure rubber mold 33.
Are installed around. Reference numeral 35 is an upper lid, and 36 is a lower lid, which are for detachably closing the upper and lower ends of the molding container 32, respectively. In this example, the upper and lower lids 35 and 36 are each composed of an inner and outer double outer lid and an inner lid (punch). A molding chamber 40 for the object 39 to be processed is configured by being fitted into the inner peripheral surfaces of the rubber mold 34 on the upper and lower ends thereof.

Therefore, in the above-mentioned conventional CIP device, as shown in FIG.
As shown by the arrow in FIG. 3, the shaded portion in the figure, that is, the object 39 to be processed and the lower punch 38 can both be taken out downward after the CIP processing, but the upper punch 37 is hermetically fitted in the molding rubber mold 34. Since there is almost no air passage, the object to be processed 39
It takes a very long time to take out, which causes an increase in cycle time.

[0005]

Therefore, in order to avoid the above-mentioned inconvenience, for example, as shown in FIG. 8, an outside air ventilation hole 41 communicating with the boundary surface between the upper punch 37 and the upper outer lid 35a is provided,
It is conceivable that a compressor 42 is connected to the ventilation hole 41 and compressed air from the compressor 42 is supplied into the molding chamber 40 via a gap between the upper punch 37 and the upper outer lid 35a.

However, since the upper punch 37 and the upper outer lid 35a are precisely fitted to each other due to the nature of the CIP device for performing high-pressure processing, it is naturally impossible to pass air between them. Therefore, even if the air is forcibly sent by the compressor 42, the remarkable effect of improving the cycle time cannot be expected. On the other hand, in the above means, as shown by phantom lines in FIG.
It is conceivable that 41 is communicated with the lower surface of the upper punch 37, but in this case, the rubber lid 43 of the object 39 to be processed enters into the vent hole 41 by the high pressure during the CIP processing and the rubber lid 43 is closed. Since the damage is caused and the internal stress of the object to be processed 39 is made non-uniform, the ventilation hole 41 cannot be simply communicated with the molding chamber 40 side.

In view of the above situation, the present invention is a dry CIP apparatus which can perform CIP processing without adversely affecting the object to be processed and can easily take out the object to be processed after the CIP processing. The purpose is to provide.

[0008]

[Means for Solving the Problems] In order to solve the above object,
The technical means taken by the present invention is that a tubular molding rubber die 3 is provided inside a tubular molding container 1, and the inside of the molding rubber die 3 serves as a molding chamber 13 for the object 12 to be treated. In a dry cold isotropic pressurizing device in which the upper and lower ends of the molding rubber mold 3 are closed by upper and lower lids 5 and 6 that close the upper and lower ends of the molding container 1, the upper lid 5 includes A valve body 21 is provided with a vent hole 17 for the outside air communicating with the lower surface 20 of the valve body 21 and having a minute gap e through which air can flow between itself and the inner peripheral surface of the molding rubber mold 3.
The point is that it is attached to the lower surface 20 of the upper lid 5 so that it can come into contact with and separate from it.

[0009]

When the object 12 to be processed starts penetrating downward from the molding chamber 13 after the CIP processing, the valve body 21 separates from the lower surface 20 of the upper lid 5 due to its own weight and the like, and the valve body 21 and the upper lid 5 are temporarily separated from each other. An air flow path 26 is formed in the air. Further, since the valve body 21 has a gap e between the valve body 21 and the molding rubber die 3, when the object 12 to be processed is displaced downward, the outside air flows from the ventilation hole 17 to the flow path 26.
And is supplied into the molding chamber 13 via the gap e (see FIG. 1).
reference).

On the other hand, during the CIP process, the valve body 21 closes the vent hole 17. Therefore, during the CIP processing, the rubber lid 15 of the object to be processed 12 and the ventilation hole 17 do not come into direct contact with each other, and the object 12 to be processed and the rubber lid 15 covering it are not adversely affected (see FIG. 2). ..

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In FIG. 3, reference numeral 1 denotes a molding container formed in a cylindrical shape, inside of which a cylindrical molding rubber mold 3 is also mounted via a pressure rubber mold 2. Incidentally, 4 is a pressure introducing hole for pressurizing provided inside the molding container 1.

Reference numeral 5 denotes an upper lid, and 6 denotes a lower lid, which are used to hermetically and detachably close the upper and lower ends of the molding container 1, respectively. Of these, the upper lid 5 is a substantially ring-shaped upper outer lid 7 that directly contacts the upper end side of the inner peripheral surface of the molding container 1, and the upper outer lid 7 is removably fitted into the fitting cylindrical portion of the upper outer lid 7. Punch 8 and
A canopy 9 attached to the upper surfaces of the upper outer lid 7 and the upper punch 8
It is divided from and. Also, the lower lid 6 is a molding container.
A ring-shaped lower outer lid that directly contacts the lower edge of the inner peripheral surface of 1
And a lower punch 11 that is fitted in the fitting cylindrical portion of the lower outer lid 10 so as to be freely inserted and removed.

The upper punch 8 and the lower punch 11 are adapted to be airtightly fitted on the upper and lower ends of the inner peripheral surface of the molding rubber die 3, respectively. Is closed and a molding chamber 13 for the object to be processed 12 is formed inside. In the present embodiment, the object to be processed 12 is previously covered with the rubber cylinder 14 and the rubber lid 15, and the molding chamber 13 is filled with the rubber cylinder 14 and the rubber lid 15. Further, 16 is an elevating table for the lower punch 11, and after CIP processing, the lower punch 11 is pierced downward from the lower outer lid 10 through the elevating table 16 so that the lower punch 11 shown in FIG.
As shown in, only the object 12 covered with the rubber tube 14 and the rubber lid 15 can be taken out downward.

Reference numeral 17 denotes a vent hole for the outside air, which is a lateral passage 18 extending from the outer surface of the canopy 9 to the radial center, and the lateral passage 18
To a vertical passage 19 penetrating the upper punch 8 along the axial center thereof, and the tip of the vertical passage 19 communicates with the lower surface 20 of the upper punch 8 (that is, the lower surface 20 of the upper lid 5). Reference numeral 21 denotes a valve body, which is made of the same material as the upper punch 8 in this embodiment,
In addition, it is formed in a disk shape having an outer diameter slightly smaller than the outer diameter of the upper punch 8, and a minute gap between the valve body 21 and the inner peripheral surface of the molded rubber die 3 to allow air flow. e is retained. If the gap e is too large, the upper end side of the inner peripheral surface of the molded rubber die 3 will be damaged during the CIP process. Therefore, it is preferable to set the dimension as small as possible so that air can flow.
If the outer diameter of the upper punch 8 is 200 to 500 mm and the thickness of the molded rubber die 3 is about 10 mm, it may be set to about 1 to 2 mm.

Reference numeral 22 is a stepped bolt, which is inserted from above into a stepped hole 23 formed through the inside of the upper punch 8 in the vertical direction, and the tip of the stepped bolt is provided on the upper surface of the valve body 21 via a screw portion 24. Is stuck to. The length of the shaft portion 25 of the stepped bolt 22 is set to be slightly longer than the vertical distance from the stepped portion of the stepped hole 23 to the upper punch 8 lower surface 20. It is attached to the lower surface 20 of the upper punch 8 via bolts 22 so as to be vertically movable.

According to this embodiment having the above structure, the valve body 21
Is attached to the lower surface 20 of the upper punch 8 by stepped bolts 22 so that it can be separated from the lower punch 20. Therefore, as shown in FIG. The upper punch 8 is separated from the lower surface 20 by its own weight. Therefore, the valve body 21
Since the air flow path 26 is temporarily formed between the upper punch 8 and the upper punch 8, and the gap e is originally provided between the valve body 21 and the molding rubber die 3, as shown by the arrow in FIG. The outside air from the pores 17 passes through the flow path 26 and the gap e, and the molding chamber 13
It is supplied inside, and the object to be processed 12 can be taken out downward without any trouble.

On the other hand, during CIP processing, as shown in FIG. 2, the valve body 21 is interposed between the rubber lid 15 of the object 12 to be processed and the upper punch 8, and the opening of the ventilation hole 17 directly contacts the rubber lid 15. Therefore, it is possible to press the isotropic pressure in an extremely sound state without causing the rubber lid 15 to enter the ventilation hole 17 due to high pressure and be damaged or to cause the internal stress of the object 12 to be nonuniform. You can

FIG. 4 shows a second embodiment of the present invention. In the present embodiment, a compression spring 27 inserted into the shaft portion 25 of the stepped bolt 22 is interposed in the stepped hole 23, and the valve body 21 is constantly urged downward by the compression spring 27. There is. Therefore, according to the present embodiment, the air flow path 26 between the upper punch 8 and the valve body 21 is
Can be secured more reliably. The rest of the configuration is similar to that of the first embodiment.

FIG. 5 shows a third embodiment of the present invention,
In the present embodiment, the compressor 29 is connected to the vent hole 17 via the solenoid valve 28. Therefore, according to this embodiment, the object 12 to be processed can be taken out more easily, and the powder in the molding chamber 13 can be cleaned by the compressed air from the compressor 29. Furthermore, FIG.
Shows a fourth embodiment of the present invention.In the present embodiment, contrary to the second embodiment, a tension spring 30 is provided in the stepped hole 23 to constantly urge the valve body 21 upward. In addition, a compressor 29 is connected to the vent hole 17 via an electromagnetic valve 28. In this embodiment, the valve body 21 is urged upward because, for example, the rubber cylinder 14 is thin, or the bulk specific gravity of the object 12 to be processed is insufficient so that the valve body 21 is lifted by the object 12 to be processed. In some cases, the CIP device of this embodiment is suitable for the object 12 having low rigidity. After the CIP process, the valve body 21 is pushed down by the compressed air from the compressor 29, and the object 12 to be processed can be taken out easily.

[0020]

As described above, according to the present invention, C
Since the object 12 to be processed can be easily taken out after the IP processing, the cycle time can be reduced, and the valve body 21 is interposed between the object 12 to be processed and the upper lid 5 at the time of the CIP processing. Body 12 and rubber cover 15 that covers it
CIP processing can be performed without adversely affecting the above.

[Brief description of drawings]

FIG. 1 is an enlarged top sectional view of a dry type CIP device showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same.

FIG. 3 is a front sectional view of the dry CIP device.

FIG. 4 is an enlarged top sectional view showing a second embodiment.

FIG. 5 is an enlarged top sectional view showing a third embodiment.

FIG. 6 is an enlarged top sectional view showing a fourth embodiment.

FIG. 7 is a front sectional view of a conventional dry CIP device.

FIG. 8 is a front sectional view of a dry CIP device showing a comparative example.

[Explanation of symbols]

 1 Molded container 3 Molded rubber mold 5 Upper lid 6 Lower lid 12 Object to be treated 13 Molding chamber 17 Vent hole 20 Lower surface 21 Valve body e Gap

Claims (1)

Claims: 1. A cylindrical molded rubber mold (3) is provided inside a cylindrical molded container (1), and the inside of the molded rubber mold (3) is treated (12). ) Of the molding container (1) to close the upper and lower ends of the molding container (1) with the upper and lower lids (5) and (6), respectively. In the isotropic pressure pressurizing device, the upper lid (5) is provided with a vent hole (17) for the outside air communicating with the lower surface (20) of the upper lid (5), and the inside of the molded rubber mold (3). A valve body (21) having a minute gap (e) through which air can flow to the peripheral surface is attached to the lower surface (20) of the upper lid (5) so as to be freely contactable and separable. Cold isotropic pressure press.