JPH0454814Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an ultra-high pressure generator for synthesizing, sintering, and compacting diamonds, ultra-hard materials, etc.
In particular, the present invention relates to an ultra-high pressure generator capable of mass-producing molded bodies with excellent properties.

[Prior Art] The present applicant proposed an "ultra-high pressure generator" (Japanese Patent Application No. 1983-225128) for use in equipment that produces diamonds, ultra-hard materials, etc. by applying tens of thousands or hundreds of thousands of atmospheres.
There is.

As shown in FIG. 4, this proposal accommodates the split sphere 2 in a container 3, and operates a piston 4 in a cylinder 7 integrally formed with the container 3 using fluid pressure. Split sphere 3 split mutually 5
They are configured to operate in synchronization in the pressurizing direction to reduce the volume of the pressurized body in the pressurizing chamber 1.

[Problems to be solved by the invention] However, the above proposal does not have a structure for forcibly returning each of the divided spheres that make up the divided sphere to their initial positions when the fluid pressure is released. Since the moving distances between the divisions are different, it may not be possible to obtain a molded body with a good shape (after pressurization), which remains a problem.

[Means for solving the problems] This invention aims to solve the above problems. This idea consists of a split sphere that reduces the volume of the pressurizing chamber of the pressurized body according to the distance moved toward the center of the split sphere, and a container that accommodates the split sphere, which is formed in a container that accommodates the split sphere and uses fluid pressure to generate the divided sphere. In an ultra-high pressure generator comprising cylinders that move each other via a piston, and positioning means that forcibly returns the split sphere to its original position when the fluid pressure is released, the positioning means is configured to A rod member which is provided so as to pass through the axes of the cylinder and piston toward the center, and whose penetrating end is screwed into the split body, and a rod member that is to be pulled back in the direction in which the split ball returns to its original position. and a spring provided in the container, and the rod member includes:
The ultra-high pressure generator is constructed by having a through hole in the shaft thereof for providing a temperature control means for controlling the temperature of the divided body, and serves as a means for solving the problem.

[Operation] When the piston, which has been returned to its original position by the positioning means, is moved in the pressurizing direction by the pressure of the working fluid supplied to the cylinder, the divided bodies that make up the divided sphere move toward the pressurized body using the rod member as a guide. Reduce the volume of the pressurized chamber. Then, a desired ultra-high pressure is generated in the pressurized body in response to the volume reduction. When the fluid pressure body of the cylinder is released, the divided bodies are returned to their original positions by the biasing force stored in the spring, and the piston is accordingly returned to its original position. As a result, the reliability of the production lot is increased as a result of preventing the dividing bulb from being eccentrically positioned with respect to the container.

Here, the temperature control means provided in the through hole of the rod member does not provide any buffer to the container and piston. Therefore, the temperature control means satisfactorily adjusts the temperature of the divided body.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, this ultra-high pressure generator consists of a split bulb 2 having a pressurizing chamber 1 in the center, a container 3 that closely covers the split bulb 2, and a split bulb 2 that extends from the side of the container 3. It is mainly composed of a cylinder 7 that houses a piston 4 that presses and pressurizes the piston 4.

The divided sphere 2 is made up of a collection of divided bodies 5 of tungsten, etc., each having a pyramidal shape with a spherical base, which are equally divided into four or more pieces along the center direction. By being turned over, a pressurizing chamber 1 is formed that accommodates a pressurized object to be pressurized.

In the illustrated example, the sphere is divided into six parts and a cubic pressurizing chamber 1 is formed in the center thereof, but the invention is not limited to this, and the sphere can be divided into four parts, eight parts,
The number of divisions is not limited as long as a regular polyhedral pressure chamber can be formed at the center of the division, such as 12 divisions. In this embodiment, the divided spheres 2 are formed so that the diameter of the divided spheres 2 is approximately 20 cm to 40 cm, and one side of the pressurizing chamber 1 is approximately 2 cm to 3 cm. The container 3 can be separated into upper and lower parts by cutting a steel cube horizontally, for example, and the divided sphere 2 is placed in the center of the container 3.
A pair of hemispherical recesses 6, 6 sufficient to accommodate the
By combining the pair of hemispherical recesses 6, 6, a spherical hollow chamber is formed.
Here, each of the divided bodies 5 is provided so as to be movable relative to each other by a minute distance toward the center thereof.

A cylinder 7 in the form of a cylindrical hole is formed in the container 3 at a position opposite to the spherical bottom 5a of each divided body 5, with its axis aligned with the center direction of the divided sphere 2, and this cylinder 7 is connected to each divided body to be formed. 5. It is provided in correspondence with...

In the embodiment, as shown in FIG.
The piston 4 accommodated in the curvature of the pressurizing surface 4a,
The curvature of the pressurized surface 5a of each divided body 5 is determined to match.

Therefore, uniform pressure can be applied to the entire spherical bottom portion 5a, and the durability of the device can be improved.

Pin holes 8a are drilled radially in the hemispherical recess 6 at 120 degree intervals centering on the pressurizing chamber 1 along the joining line between the divided bodies, and a positioning pin 8 is inserted into each of these pin holes 8a. By inserting pins 8 between adjacent divided bodies, the gaps between the divided bodies are made uniform, and each divided body 5 is aligned with respect to the container 3.
I am trying to keep the position of...

Further, outwardly projecting flanges 9, 9 are mutually formed on the sides of the joint surfaces of the divided container 3, and these flanges 9, 9 are mutually connected to a joint 10 having a U-shaped cross section. The divided containers 3 are firmly fixed by being sandwiched between them.

Now, the piston 4 operates well in the pressurizing direction,
In addition, a configuration for successfully returning to the original position after pressurization will be explained.

An annular recess 15 is formed on the pressure receiving surface 4b of the piston 4 around the axis.
A columnar sliding portion 16 is formed on the axis of the piston 4 . On the axis of this sliding part 16, there is a through hole 1.
7 is opened. On the other hand, in the cylinder 7, the bottom part of the axis of the cylinder 7 extends toward the center of the split ball 2, engages the sliding part 16, and guides the sliding part 16 toward the center of the split ball 2. A guide tube portion 18 is formed therein, and a small diameter shaft hole 19 is formed on the axis of the guide tube portion 18 to penetrate the container 3. The shaft hole 19 has a guide cylinder portion 18 and a through hole 1.
A rod member 20 passing through the rod member 7 and having one end screwed and fixed to each of the divided bodies 5 is fitted, and
A spring accommodating portion 21 whose diameter is expanded radially outward is formed in the shaft hole 19 that the other end side of the rod member 20 faces.

In the embodiment, this spring housing portion 21
A spring 22 is housed in the spring 22 .
The nut 23 and the lock nut 24 at the other end of the rod member 20 are used to arbitrarily adjust the spring force and determine the initial position of each divided body 5, and the cylinder 7
When the fluid pressure inside is released, each divided body 5 is forcibly moved in the return direction. That is, the rod member 20, the spring 22, the lock nut 2
4. The nut 23 constitutes a positioning means in the embodiment.

The working fluid is formed in the container 3 and flows into the cylinder 7.
It is supplied and discharged by a working fluid path 25 that communicates with the inside.

By the way, the material of the piston 4 is preferably aluminum, which has a relatively high elongation rate among metal materials, in order to ensure uniform balance during pressurization. Further, a seal ring 12 is provided on the inner wall surface of the cylinder 7 to improve liquid tightness.

Next, the assembly and the operation after assembly will be explained.

First, the divided body 5 is appropriately assembled into the hemispherical recess 6 of the divided lower container 3. In this case, the position of the piston 3 is accurately adjusted so that the head portion of the piston 3 corresponds to the spherical recess 5a of each divided body 5. To adjust the position, positioning pins 8 are inserted into each pin hole 8a drilled in the hemispherical recess 6 with their tips protruding, and the side surfaces of the divided body 5 are placed against these pins 8 and assembled. I'll decide. As a result, each divided body 5 is positioned, and at the same time, adjacent divided bodies 5 are held slightly spaced apart from each other by the diameter of the pin 8.

Then, when an appropriate number of divided bodies 5 have been assembled (as shown in the figure, if the divided body is six divided, three pieces have been assembled), the lower half of the apparatus is assembled. In the same manner, the split bulb 2 is assembled into the upper container 3 to assemble the upper half of the present device. Next, a pressurized object such as graphite is housed in the pressurizing chamber 1 formed at the center of the assembled lower half, and the upper half of the device, which has already been assembled, is placed on top of it, and the pressurized object is protruded from both sides. The entire container 3 is fixed integrally by sandwiching the molded flanges 9, 9 between a joint 10 having a U-shaped cross section.

When the assembly of the container 3 is completed in this way, each divided body 5... is moved to the piston 4... by inserting high pressure fluid from the inlet of the working fluid path 25.
It is pressed toward the center by... and can apply ultra-high pressure to the object being pressed. At this time, by using a common hydraulic power source for each cylinder, the pressing force of each piston 4 can be made equal. Furthermore, the diameter of each piston 4 is made as large as possible so that the pressurizing surface 4a contacts the divided body 5 over almost the entire area, so that a substantially uniform load is applied to the divided body 5. That is, it is possible to prevent undesirable forces such as shearing force from being applied during pressurization, thereby reducing damage to this type of jig and maintaining high durability.

In addition, since aluminum or the like, which has a relatively high elongation rate among metals, is used as the material for the piston 4, the curvature of the pressurized surface 5a and the pressure surface 4a of the piston 4 are bent so as to come into close contact with the pressurized surface 5a. Therefore, it is possible to reliably prevent uneven pressure from being applied to the divided body 5 side.

When the ultra-high pressure load is finished, the working fluid in each cylinder 7 is discharged from the working fluid supply path 25 to a hydraulic tank (not shown), etc. Accordingly, the spring 22 is connected to each divided body via the rod member 20 in response to the pressure reduction. Return 5 to its original position.

Thereafter, the joint 10 having a U-shaped cross section that fixed the container 3 is removed, and the upper container 3 is removed, allowing the molded body to be taken out without staining the surrounding area or the operator with oil.

By the way, in the case of volume reduction molding of the pressurized body, each segment 5 of the segment sphere 2 will also be used at high temperature and high pressure, so in order to increase the durability of the segment 5, it is necessary to It is necessary to keep the temperature at an appropriate temperature except for the pressure chamber 1 side. Therefore, while forming cooling channels 30 inside each divided body 5, the rod member 20
As shown in FIG. 2, an outgoing path 26 and an incoming path 27 of the cooling water are formed within the cooling water, and the outgoing path 26 is connected to the outgoing side of the cooling water channel, and the incoming path 27 is connected to the return side of the cooling water channel, so that the cooling water temperature can be adjusted. The system is configured to allow for temperature control.

In addition, if it is necessary to heat the pressurizing chamber 1 in order to obtain a molded product with good properties, a hole 3 for embedding a heater 28 in the divided body 5 is provided as shown in FIG.
1, and the support part 29 of the heater 28 is inserted into this hole 31.
The heater 28 is attached by fitting it.

Note that the outward path 26, return path 27, and hole 31 of the cooling water in the embodiment each constitute a through hole according to the present invention.

[Effect of the invention] As is clear from the above explanation, the position of each segment constituting the segmented sphere can be forcibly returned to its original position by the positioning means when the fluid pressure is released. Each divided body can be moved in synchronization during pressing, thereby greatly improving the reliability of pressure molding of the pressurized body. Since the temperature control means can be attached to the through hole of the rod member, the temperature of the split bulb can be properly controlled, and its durability and reliability can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention, FIGS. 2 and 3 are sectional views showing other embodiments, and FIG. 4 is a sectional view showing an ultra-high pressure generator as a conventional example. It is. In the figure, 1 is a pressurized chamber, 2 is a divided sphere, 3 is a container, and 4
5 is a piston, 5 is a divided body, 7 is a cylinder, 20 is a rod member, and 22 is a spring.

Claims (1)

[Scope of utility model registration request] A split sphere that reduces the volume of the pressurizing chamber of the pressurized body according to the distance moved toward the center of the split sphere, and a container that accommodates the split sphere, which pistons the split bodies of the split sphere to each other using fluid pressure. a cylinder to be moved through;
and a positioning means for forcibly returning the split sphere to its original position when the fluid pressure is released, wherein the positioning means is configured to move the axial center of the cylinder and piston toward the center of the pressurizing chamber. A rod member is provided through the container and has its penetrating end screwed into the split body, and a spring is provided in the container to pull the rod member back in the direction of returning the split ball to its original position. . The ultra-high pressure generator, wherein the rod member has a through hole in its shaft for providing a temperature control means for controlling the temperature of the divided body.