JPH0349679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure container for a cold isostatic press apparatus for compression molding powder.

Hydrostatic pressurization equipment that compresses and molds high-pressure processed raw materials using a pressure medium uses either a screw type or a press frame type, but the former has problems with the fatigue strength of the threaded part, and the screw cap When attaching and detaching operations are complicated and high productivity is required, a press frame type hydrostatic pressurizing device is often used. In recent years, the molding pressure of this press frame type hydrostatic pressurizing device has become extremely high. When maintaining such ultra-high pressure, the high-pressure vessel must have its wall thickness (i.e.
It is necessary to increase the inner diameter ratio), but when the internal pressure is high, even if the outer-inner diameter ratio is set to 3 to 4 or more, it will have little effect on reducing the stress generated on the inner surface of the high-pressure vessel.
This high stress results in a limited useful life of the high pressure vessel. Conventionally, as a countermeasure to this problem, methods such as shrink fitting have been used to impart compressive residual stress to the inner surface of the high-pressure container, but there are limits to their effectiveness at ultra-high pressures.

For this purpose, the pressure receiving area on the high pressure vessel main body side is larger than the pressure receiving area on the pressure intensifying vessel side by arranging the pressure intensifying vessel inside the high pressure vessel main body and opening in the high pressure vessel main body provided in the same pressure intensifying vessel. The pressure booster piston is inserted into the larger pressure booster piston so that it can move in the axial direction. A device that can obtain even higher pressure has been proposed.

However, in such a device, the object to be processed must be placed in the pressure intensifier container, and the tasks of filling the pressure container with water, removing air, and charging the pressure container into the high-pressure container body must be carried out independently. The problem was that the workability was poor because of the process.

In view of the above-mentioned problems, the present invention provides a device that facilitates the introduction of objects to be processed into a high-pressure container and automates the removal of air from the high-pressure container main body and pressure intensifier container. The purpose is to

Embodiments according to the present invention will be described below based on the drawings. FIG. 1 is a longitudinal cross-sectional view of a high-pressure container, and FIG. 2 is a process diagram of cold isostatic pressurization using this high-pressure container. In the figure, A is the high-pressure container main body into which the present pressure intensifier container is placed, B is the upper lid of the high-pressure container main body A, and the lid is provided with a water supply and drainage port C. Reference numeral 1 denotes a pressure intensifier container, and 3 a pressure intensifier container cover, which are integrated into one body by screw fastening. Further, the pressure intensifier container cover 3 is attached to the high pressure container upper lid B by a pressure intensifier container mounting fitting D, and the pressure intensifier container is structured to be suspended from the upper lid. Reference numeral 6 denotes a pressure boosting piston guide, which is attached to the lower part of the water supply/drainage port C of the upper cover B as one unit by fastening screws. Reference numeral 2 denotes a pressure booster piston, which slides along the pressure booster container cover 3 and pressure booster piston guide 6, is airtightly fitted into the pressure booster container 1 with a gasket 10, and moves downward under pressure on its upper surface. . 21
is a gas phase portion, and is designed not to become a resistance to the movement of the pressure boosting piston 2.

11, 12, 13, 14 and 15 are packkins. The pressure booster piston guide 6 has a water supply and drainage port 6a.
is provided, and a check valve 7 is incorporated in the lower part. Reference numeral 5 denotes a valve push rod whose tip end is inserted into the check valve from the upper part through the water supply and drainage port 6a, and when 5 is pushed down, the check valve 7 is opened. 2a is a drainage passage, 2
b is a water supply passage, and a check valve 8 and a pressure regulating valve 9 are installed in the pressure increasing piston 2 and interposed in each passage. The pressure regulating valve 9 is set below the maximum pressure of high pressure water. Reference numeral 4 denotes a raw material receiving seat, which has a lattice structure and is attached to the pressure intensifying vessel 1 in a structure that allows it to be easily attached and detached. Reference numeral 16 denotes a pressure booster container seat, which is attached to the lower lid at the bottom of the high pressure container A with bolts 20, and is hermetically sealed to the bottom of the pressure booster container 1 by a gasket 18. 17 and 19 are also Patsukin.

E is a drain hole provided in the lower lid of the high-pressure container A, and a high-pressure gate valve (not shown) is attached to the outside. When the pressure is increased, this part is subjected to the same high pressure as inside the pressure intensifier container 1, so if a pressure detector is attached outside the drain, the pressure inside the pressure intensifier container 1 can be detected.

The operation of the high-pressure container having the above structure will be explained based on the cold isostatic pressurization process (FIG. 2) using this high-pressure container.

a The pressure booster container 1 is suspended below the upper lid B of the high pressure container A, and is positioned above the upper lid B together with the loading/unloading device L. At this time, a water supply and drainage shaft (not shown) is inserted into the water supply and drainage port C, and the valve pusher rod 5 is pushed downward, causing the check valve 7
is open to the public. In addition, high-pressure processing raw material H
is placed on the raw material receiving seat 4 and set on the receiving stand G.

b Lower the pressure booster vessel 1 and attach the catch seat 4.
(Insertion of raw materials) c. Lift the pressurized container 1 upward together with the raw material H inside.

d Move high pressure vessel A to pressure intensifier vessel 1. There is an arbitrary amount of water in the high pressure vessel A.

e Put the pressure booster container 1 into the high pressure container A. By this injection, the water level in the high pressure container A rises, and if there is a shortage, the water supply and drainage shaft (not shown) → Water supply and drainage port C
Water is supplied through the high-pressure container A, and overflows from the overflow port K at the top of the high-pressure container A, so that there is a sufficient amount of water in the container. Also, since the bottom of the pressure booster container is open, water flows into the container, and at the same time, the check valve 7, which is opened by the valve push rod 5, is opened.
Air is vented through the water supply and drainage ports 6a and C.

f The pressure intensifier container 1 is further lowered and the bottom portion is fitted into the pressure intensifier container seat 16 for sealing. At the same time, the upper lid B is fitted onto the upper part of the high pressure container A in an airtight manner. At this time, the air and excess water in the high-pressure container A are removed from the upper lid B.
As a result, the water is discharged to the upper part through the check valve 8 → drain passage 2a → drain port 6a → drain port C. In this way, filling of the pressure intensifying container 1 and the high pressure container A with water and removing air are completed at the same time as fitting the lids.

g. Separate the upper cover B and the loading/unloading device L. At this time, the water supply and drainage shaft (not shown) is pulled out from the water supply and drainage port C, and the spring inside the check valve 7 causes the valve body and the valve push rod to rise upward, and the valve 7 is closed.
Next, move the high-pressure container A into the press frame, and connect the pressurized water injection shaft (not shown) to the water supply and drainage port C.
Insert it and send high-pressure water to apply pressure.

At this time, the injection shaft is inserted to a depth that does not hit the valve pusher rod 5, so that the check valve 7 does not open.

h At the primary pressure (below the set pressure of the pressure regulating valve 9), pressurized water is sent only into the pressure increasing container 1 by the pressure regulating valve 9, and compression molding of the raw material H is performed. When the pressure further increases, the pressure regulating valve 9 opens, and high pressure water also flows into the high pressure container A and is pressurized. Due to the balance of pressure inside and outside the pressure intensifier container 1, the pressure intensifier piston 2 receives pressure on the upper surface and is pushed into the pressure intensifier container 1, and the pressure in the pressure intensifier container 1 is increased according to the pressure receiving area ratio of the pressure intensifier piston 2. Ru. At this time, the pressure inside the pressure intensifying vessel 1 is reduced by the check valve 7.
is closed and held.

i When compression molding is completed, pressurized water flows through check valve 8→
The water is discharged through the drainage passage 2a → water supply/drainage port 6a → water supply/drainage port C, and the pressure inside the high-pressure container A is lowered to normal pressure. At this time, the pressure intensifier piston 2 is pushed upward by the pressure inside the pressure intensifier container 1, and
The pressure inside is lowered to the set pressure (primary pressure) of the pressure regulating valve 9.

j Further, the pressure in the pressure increasing container 1 is lowered to normal pressure by inserting the pressurized water injection shaft deeper and pushing down the valve push rod to open the check valve 7. of course,
The pressure can also be lowered by opening the drain hole E.

The processed raw material is taken out in the reverse order (g) → (f) → (e) → (d) → (c) → (b) → (a).

As explained above, according to the present invention, the pressure intensifier container and the pressure container are filled with water and air is vented simultaneously with the insertion of the pressure intensifier into the high-pressure container and the fitting of the upper lid, thereby improving work efficiency. The cycle time can be shortened, and the high-pressure treatment raw material can be easily introduced into and taken out from the pressure intensifying container, so the cycle time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment according to the present invention;
FIG. 2 is a process diagram of cold isostatic pressurization according to the embodiment shown in FIG. 1... Pressure booster container, 4... Raw material receiver, 7... Check valve, 8
…non-return valve.

Claims (1)

[Scope of Claims] 1. A cold isostatic pressurizing device for compressing and molding an object to be processed by a pressure medium into a high-pressure container main body, which is formed by attaching upper and lower lids to the upper and lower openings of a high-pressure cylinder. The high-pressure vessel includes a cylindrical pressure-intensifying vessel that can be inserted into the high-pressure vessel main body and is suspended from the top lid, and a pressure higher than the pressure receiving area on the pressure-intensifying vessel side is provided at the upper opening of the pressure-intensifying vessel. A pressure intensifier piston having a larger pressure receiving area on the side of the container body is fitted so as to be movable in the axial direction, a processing object receiving seat is removably provided in the lower opening of the pressure intensifying container, and the lower opening is sealed. A high-pressure vessel characterized by having a pressure booster vessel seat fixedly attached to a lower lid. 2. In a high-pressure container of a cold isostatic pressurizing device, the object to be processed is compressed and molded by a pressure medium into a high-pressure container main body, which is formed by attaching upper and lower lids to the upper and lower openings of a high-pressure cylinder. A pressure intensifying vessel that can be inserted into the high pressure vessel main body and is suspended from the upper lid, and the pressure receiving area on the high pressure vessel main body side is larger than the pressure receiving area on the pressure intensifying vessel side at the upper opening of the pressure intensifying vessel. A passageway in which a large pressure intensifying piston is fitted so as to be movable in the axial direction, and a passage communicating between the inside of the high pressure container main body and the outside air via a check valve, and a passage connecting the inside of the pressure intensifying container and the outside air through the check valve. A high-pressure container characterized by being provided with a communicating passage.