JPH0829437B2 - CIP device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a CIP device for sealing ceramics or powder metal in a mold (rubber bag or the like) that is easily deformable and applying isotropic pressure to form the CIP device.

(Prior art) CIP equipment (Cold Isostatic Pressing) is a technology that uses a liquid such as water as a pressure medium and applies a high isotropic pressure of 1000 kg.f / cm ² or more to powder to form it into various shapes. Widely used in the field of ceramics and powder metallurgy.

In this CIP device, the pressure medium is circulated and used, and if powder that adheres to the outer surface of the mold or powder due to damage to the mold during molding mixes with the pressure medium, the pressure vessel lid or ultra high pressure In many cases, pressure leaks were caused, which caused damage mainly to the seal part of equipment (particularly valves such as pressure reducing valves).

Therefore, in order to prevent the powder from entering the line,
As shown in FIGS. (I) and (II) and FIGS. 6 (I) and (II), those using a pressure medium separation membrane have been conventionally used.

In FIGS. 5 (I) and (II) and FIGS. 6 (I) and (II), upper and lower lids 1 and 2 are removably fitted to the pressure vessel 3, and in the example of FIG. The pressure medium separation membrane 4 made of a material such as a deformable container such as rubber via the seal portion 4a is a pressure medium port.
A mold 4 is provided on the lower lid 2 having 2a, and in the example shown in FIG. 6, the diaphragm 4 is also attached via the upper outer lid 1'and is connected to the external pressurizing / depressurizing line 16 and the primary pressure medium 5 and the mold. The secondary pressure medium 5'which directly contacts the (molded body) 6 is completely separated.

Then, in the pressurizing process, as shown in FIG. 5 (II) and FIG. 6 (II), the primary pressure medium compressed by the ultra-high pressure pump 11 is supplied through the port 2a, and the secondary pressure medium is supplied through the diaphragm 4. The pressure is transmitted to the next pressure medium 5 ', and the isotropic pressure is applied to the surface of the mold 6 in which the powder 7 is sealed, so that the powder 7 is molded.

At this time, since only the primary pressure medium is supplied as the pressure medium, the diaphragm 4 is largely deformed due to the contraction of the powder 7 and the secondary pressure medium,
In the depressurization process, the depressurization throttle valve 12 and the depressurization valve 13 are operated through the port 2a, and the primary pressure medium is collected in the pressure medium tank 14.

In FIGS. 5 and 6, 8 is a protective cylinder and 15 is a water supply pump.

(Problems to be Solved by the Invention) By the way, in the conventional techniques shown in FIGS. 5 and 6, since the contraction amounts of the secondary pressure medium and the powder are covered only by the supply of the primary pressure medium, There is a problem that the amount of deformation of the diaphragm 4 is large and the life is shortened.

The apparatus shown in FIG. 5 requires the protective cylinder 8 corresponding to the amount of deformation of the diaphragm 4, which causes a problem that the effective volume in the pressure vessel becomes small.

That is, the amount of powder is 40% of the inner volume of the container, and the powder shrinkage rate is 50%.
%, And the pressure is 2000 kg.f / cm ² , the effective depth of the container decreases to about 2/3 of the container depth.

Further, since there is no mechanical function of supplying and draining the secondary pressure medium, automation of the device is impossible.

For the above reasons, it is not suitable for efficient practical use on the production line.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a CIP device which solves the problems described above and which can be put to practical use in a production line.

(Means for Solving Problems) In the present invention, the pressure vessel 3 is separated into a primary pressure medium 5 connected to a pressure reduction line 16 and a secondary pressure medium 5'which is in direct contact with the molded body 6. In the CIP device having the pressure-medium separating diaphragm 4, the following technical measures were taken in order to achieve the stated object.

That is, the present invention is characterized in that the pressure medium line 26 having a function of at least pressurizing the pressure medium is connected to the side of the secondary pressure medium 5 '.

(Operation) When the molded body 6 is loaded and set in the pressure vessel 3 and pressure molding is performed, pressure is applied from both the pressurization and depressurization line 16 and the secondary pressure medium line 26, and The powder in the compact 6 is pressure-molded by an isotropic pressure with a small deformation.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

As is apparent from FIGS. 1 to 3, the point that the pressure medium line 26 for the secondary pressure medium is attached is different from the conventional example (FIG. 6), and the difference will be described in detail below. As described above, the portions common to the conventional ones are shown by the common symbols in FIG.

In FIG. 1, the upper lid 1 has a port 1a for a secondary pressure medium, and a pressure pump 22 or a water supply pump 21 that pressurizes and supplies the pressure medium in the secondary pressure medium tank 24 to this port 1a. Is connected to the pressure medium line 26. In the figure, 27 indicates a check valve.

FIG. 2 shows a pressure medium line 26 having a water supply pump 21 and a pressure pump 22 separately connected to the port 1a.
27 and 28 are check valves.

FIG. 3 shows the apparatus of FIG. 2 in which a pressure medium line 26 further having a drain valve 23 and a water supply / drain valve 25 is connected to the port 1a.

That is, in any of the embodiments, in addition to the pressurization / depressurization line 16 for the primary pressure medium, the pressure medium line 26 for at least the secondary pressure medium having a pressurizing function is provided.

Here, the primary pressure medium and the secondary pressure medium may be the same or different. For example, general hydraulic oil and water are used as the primary pressure medium, and water and the like are used as the secondary pressure medium. To be

Further, in each embodiment, the pumps on the primary side and the secondary side are separate, but this may be one in which the primary side and the secondary side are shared, and the pressure medium tank is When using the same one, it may be one shared tank.

Referring to each figure of FIG. 4, an example of the molding cycle is shown.

In FIG. 4, the molded body 6 is loaded into the bucket 29,
It is loaded and set in the pressure vessel 3 through the upper opening together with the bucket 29 (see FIGS. 4 a, b and c).

Then, when the secondary pressure medium is already supplied with water, as shown in FIG. 4d, when the upper lid 1 is charged and set, the secondary pressure medium is drained through the port 1a.

As a result, the body is ready for molding, and the well-known upper and lower lids 1 and 2 engage the portal press frame to carry the axial force of the press. The secondary pressure medium is supplied with water from the port 1a through the line 26 to pressurize the compact 6 (actually powder in the rubber bag) by isotropic pressure.

When the predetermined pressure molding is completed, the primary pressure medium side is depressurized and drained (the secondary pressure medium may be depressurized and drained), and the upper lid 1 is opened as shown in FIG. 6 is a bucket
Remove from container 3 every 29th.

(Effects of the Invention) The present invention is as described above, and the present invention provides a pressure vessel,
CIP with a pressure medium separation membrane that separates the primary pressure medium connected to the pressure decompression line and the secondary pressure medium that directly contacts the compact
Since the apparatus is characterized in that the pressure medium line having a function of at least pressurizing the pressure medium is connected to the secondary pressure medium side, the following advantages are obtained.

Since the pressure medium line on the secondary pressure medium side has at least a pressure function, when pressure molding with the primary pressure medium,
The diaphragm can be deformed only by the amount of contraction required for decompression, and the deformation can be reduced. Therefore, the life of the diaphragm can be extended.

Further, the effective volume (effective depth) of the pressure vessel can be increased to about 90% of the vessel depth.

Also, the operation of supplying water (pressurizing or the like) or draining water (when the upper lid is attached) of the secondary pressure medium can be automated, and thus the apparatus itself can be automated.

These enable practical application to the production line, and CI
It is a large profit as a P device.

[Brief description of drawings]

The drawings show an embodiment of the present invention and a conventional example. FIG. 1 is a sectional view of the first embodiment of the present invention, FIG. 2 is a sectional view of the second embodiment, and FIG. 3 is a sectional view of the third embodiment. 4A to 4G are sectional views showing a cycle (operating process) of the embodiment of the present invention, FIG. 5 (I),
(II), FIGS. 6 (I) and (II) are cross-sectional views of a conventional example. 1 ... Top lid, 1a ... Secondary pressure medium port, 2 ... Bottom lid, 3 ...
… Pressure vessel, 16 …… Pressurization / decompression line for primary pressure medium, 26 ……
Secondary pressure medium line.

Claims (1)

[Claims] 1. A CIP having, in a pressure vessel 3, a pressure medium separation membrane 4 for separating a primary pressure medium 5 connected to a pressure decompression line 16 and a secondary pressure medium 5'which is in direct contact with a molded body 6. In the device, a CIP device characterized in that a pressure medium line 26 having a function of at least pressurizing the pressure medium is connected to the secondary pressure medium 5'side.