JP2936856B2 - Method for producing isostatic pressing mold and press-formed body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for isostatic pressing.
More specifically, a method of manufacturing a pressed body, more specifically, press-forming a powder, particularly a ceramic powder, into a cylindrical state in which a brittle central member such as glass is inserted into the center and both ends are projected. isostatic pressing type capable of producing a pressed compact formed by, and such like
Manufacture of pressed bodies by using isostatic pressing
Construction method .

[0002]

2. Description of the Related Art Conventionally, a compact has been manufactured by press-forming a ceramic powder by an isotropic isostatic pressing apparatus. In a conventional isostatic pressing apparatus, ceramic powder is filled in an isostatic pressing mold, and the isostatic pressing mold is degassed in a bag of an appropriate synthetic resin film, for example. Wrapped in condition,
The package is immersed in a pressurized medium in a pressurized container in an isotropic hydrostatic press, and isotropically hydrostatically pressed to produce a pressed compact of ceramic powder. A pressure-formed body of ceramics produced by this isotropic isostatic pressing apparatus is usually obtained by pressing only ceramic powder. In recent years, as a pressed body of ceramic powder, a formed article in which a brittle material such as a glass rod is incorporated into a pressed body of ceramic powder has been required. For example, as a composite molded article of a heterogeneous ceramic, a molded article in which both ends of a small-diameter glass rod are protruded and ceramic powder is solidified in a cylindrical shape on the outer periphery of the glass rod is desired.

[0003] Thus, a pressed body having a shape in which a glass rod is inserted through the axis of a cylindrical pressed body made of ceramics, for example, and both ends of the glass rod project from both ends of the cylindrical pressed body is manufactured. The following method was examined as a method of doing.

[0004] That is, first, a cylindrical gore opening at both ends is provided.
The rubber mold and the rubber mold
At the center corresponding to the axis of the mold, the same
Two rubber lid members having positioning recesses having a diameter;
Prepare Then, while setting up the cylindrical rubber mold,
The rubber lid member is attached to the lower opening. Soshi
Position of the lid member attached to the lower opening of the cylindrical rubber mold
Insert a glass rod into the concave part and set it into a cylindrical rubber mold.
Make a stick. In this state, the ceramic is placed in a cylindrical rubber mold.
Filling powder. At the top opening of the cylindrical rubber mold,
Attach the material. At the time of this mounting, the positioning recess of the lid member
Then, insert the upper end of the glass rod. As a result, cylindrical
A glass rod stands upright in the center of the rubber mold
At the same time, insert both ends of the glass rod into the positioning recess of the lid member
In rare cases, the powder is filled around the glass rod.
In this state, the upper and lower end surfaces of the glass rod are in the position of the lid member.
It is in close contact with the bottom of the
Of the positioning recess in the lid member so as to contact like
The dimensions have been determined.

Thus, the cylindrical rubber mold filled with the ceramic powder is disposed at the center of the rubber mold, and both end surfaces thereof are covered with the lid.
It is fitted into the positioning recess of the material and
A molding die in which the powder is filled in the shape is obtained.

Next, the molding die is housed in a plastic film bag, the inside of the bag is evacuated, and the opening of the bag is sealed. Next, the molding die packaged in the bag is placed in a pressurized container of an isotropic hydrostatic pressure molding device, and isotropic pressure by a pressurized medium is applied to the molding die.

However, the isotropic hydrostatic pressure molding method using such a molding die has a problem that the glass rod is always broken during the pressurization despite applying the isotropic hydrostatic pressure. there were.

[0008] The cause of the breakage of the glass rod was considered.
As a result, look at the glass rod in the cylindrical rubber mold
And both ends of the glass rod and the positioning recess in the lid member
Because the bottom surface is in contact,
Pressure on the end face of the glass rod through the bottom of the positioning recess
Concentration causes radial pressure on the glass rod
Force and pressure on both ends of glass rod break balance
This means that the glass rod breaks during pressure molding
Was thought to be. Therefore, a rubber member opening
When mounted on the part, the bottom of the positioning recess in the lid member
Surface does not touch the end faces of the glass rod standing in the gum mold.
To increase the depth of the positioning recess,
When the end of the glass rod is inserted into the
A certain clearance between the bottom of the positioning recess and the tip of the glass rod
The positioning recess in the lid
The depth dimension was adjusted. And such dimensions are adjusted
The lid with the positioning recess
It was attached to the mouth. At this time, the shaft is
The center glass rod is placed upright and the tip of the glass rod
Is fitted into the positioning recess of the lid member.
You. And, as mentioned above, the tip of the fitted glass rod
A fixed gap is provided between the end face and the bottom of the positioning recess.
ing. Rubber mold with glass rods arranged in the above state
A support that is attached to the outer periphery of the rubber mold and supports the lid member.
The holding frame was attached. By attaching this support frame,
This pressure is received by the support member and the presence of the support
Pressure on the lid, which would occur when
Attempts to eliminate pressure concentration on the end face of the glass rod of force
did. However, even with such considerations, pressure molding
Can not prevent the breakage of the glass rod in the
The breakage of the rod continued. This cause
The inventors have further considered. As a result, in the lid member
Bottom of positioning recess and inserted into the positioning recess
Due to the gap between the end of the glass rod and the
When formed, the pressure applied to the lid member is excessively high on the end face of the glass rod.
Radial glass rods, although they are no longer added
Only the pressure applied from the direction is applied to the glass rod.
Pressure applied to the axis of the glass rod (actually 0
You. ) And the pressure applied from the radial direction
Is the biggest cause of glass rod breakage
Was done.

The present invention has been made based on the above circumstances. That is, an object of the present invention is to provide a molding formed by inserting a brittle member such as glass into a columnar molded body made of ceramic powder so that both ends thereof protrude from an end surface of the molded body. An object of the present invention is to provide a mold for isostatic pressing under which a compact can be manufactured.

[0010]

According to a first aspect of the present invention, there is provided a cylindrical part, and an opening at both ends of the cylindrical part, and an axial center of the cylindrical part. First and second lids each having a central member insertion hole
A lid, and filling the powder into the cylindrical portion and closing the opening of the cylindrical portion from the central member insertion hole of each of the first lid portion and the second lid portion to another central member insertion hole. 3. A mold for isostatic pressing under pressure, wherein isotropic isostatic pressing can be carried out in a state in which the core member and the central member are penetrated.
According to the invention described in the above, the tubular portion is separable into a first tubular portion and a second tubular portion, the first tubular portion and the first lid portion are integrally formed, and the second tubular portion is formed. And the second lid are integrally formed. The isotropic isostatic pressurizing die according to claim 1, wherein the cylindrical portion and one end opening thereof are closed. The isotropic hydrostatic pressure mold according to claim 1, wherein the first lid portion is formed integrally with the first lid portion. The invention according to claim 4, wherein the center member insertion hole is formed inside the lid portion. The isotropic isostatic pressurizing die according to claim 1, wherein the opening and the outer opening have the same shape, and the invention according to claim 5, wherein the center member insertion hole is The isotropic hydrostatic pressure mold according to claim 1, wherein the outer opening in the lid has an opening area larger than the inner opening.
According to a sixth aspect of the present invention, in the first aspect of the present invention, the first lid and the second lid are provided with a support member disposed outside the cylindrical portion. Hydraulic pressure type.
According to a seventh aspect of the invention, there is provided a cylindrical portion and both ends of the cylindrical portion.
While closing the opening and sharing the axis of the cylindrical part
First lid and second lid each having a core member insertion hole
The first lid portion is attached to the isotropic hydrostatic pressure mold formed by the
And insert the central member into the central member insertion hole of the second lid portion.
And filling the powder into the isostatic pressing mold,
Pressure forming characterized by pressurizing a mold for isostatic pressing
It is a method of manufacturing the body.

[0011]

The isotropic hydrostatic pressure mold according to the present invention fills a cylindrical space formed by a cylindrical portion with a powder, for example, ceramics, and has a central portion provided in a first lid portion and a second lid portion. A brittle rod, for example, a glass rod is inserted from the insertion hole into the other central insertion hole, and in that state, the package is vacuum-packaged with a bag. The vacuum-packed isotropic isostatic press
It is isotropically pressed by an isotropic hydrostatic press. By removing the cylindrical portion, the first lid portion and the second lid portion after the pressure molding, the powder is pressure-molded into a column shape without breaking the brittle rod, and the center is inserted through the center. At the same time, a molded article having a shape in which a glass rod projects from both ends of the powder molded article is obtained.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention.

As shown in FIG . 1 , a mold 1 for isostatic pressing
Has a tubular portion 2, a first lid 3a, and a second lid 3b. The tubular part 2 is a cylindrical body having openings at both ends. The cylindrical portion 2 is formed of a hard rubber member.
The first lid 3a has a circular shape when viewed from the top in FIG. 1, and has a circular first central member insertion hole 4a at the center thereof. The cylindrical portion 2 is provided on the lower surface of the first lid portion 3a.
A first fitting mounting portion 5a that fits inside is protrudingly formed. On the other hand, the second lid 3b has the same shape as the first lid 3a. That is, in the second lid 3b,
Reference numeral 4b denotes a second central member insertion hole, and reference numeral 5b denotes a fitting mounting portion.

The cylindrical portion 2, the first lid 3a, and the second lid 3
Using b, isotropic isostatic pressing is performed as follows.

That is, the cylindrical portion 2 is set up, and the second lid portion 3b is fitted and mounted in the opening below the cylindrical portion. Next, the glass rod 6 is inserted into the second center member insertion hole 4b of the second lid 3b such that the tip of the glass rod 6 in the insertion direction coincides with the outer surface of the second lid 3b. When the glass rod 6 is inserted in such a manner, the glass rod 6 stands up inside the cylindrical portion 2, and the tip on the opposite side to the one inserted into the second lid portion 3 b has the cylindrical portion. The other end projects from the opening. Next, the upright cylindrical portion 2 is filled with, for example, ceramic powder 7. After the filling, the tip protruding from the cylindrical portion 2 is passed through the first center member insertion hole 4a of the first lid portion 3a, and the first lid portion 3a is pushed down to make the other end opening of the cylindrical portion 2 material open. , So as to seal it,
a into the opening of the cylindrical portion 2 and the first lid 3
a. When mounted, the tip end surface of the glass rod 6 is inserted into the first central portion insertion hole 4a of the first lid 3a.
Coincides with the outer surface of

Here. The length of the glass rod 6 is determined by the first and second center member insertion holes 4 in the first lid 3a and the second lid 3b attached to the openings at both ends of the cylindrical portion 2, respectively.
When the glass rod 6 is inserted through the glass rods 6a and 4b, one end surface of the glass rod 6 coincides with the outer surface of the first lid 3a or becomes slightly recessed from the outer surface. The value is such that the tip surface of the glass rod 6 coincides with the outer surface of the second lid 3b or is located at a position slightly recessed from the outer surface. In other words, the axial center lengths of the center insertion holes 4a and 4b in the first lid 3a and the second lid 3b are equal to the first lid 3a and the second lid attached to the openings at both ends of the cylindrical portion 2. Center member insertion holes 4a,
The glass rod 6 is designed such that one end face of the glass rod 6 coincides with the outer surface of the first lid 3a or is slightly recessed from the outer surface when the glass rod 6 is inserted through the glass rod 6b. You.

As described above, the first lid 3a and the second lid 3a
The cylindrical portion 2 to which the lid 3b is attached is filled with, for example, ceramic powder 7 and the glass rod 6 is inserted into the central member insertion holes 4a and 4b of the first lid 3a and the second lid 3b. As shown in FIG. 2, a molding die (hereinafter simply referred to as a molding die) is packed in a bag 8 made of a plastic film or a plastic sheet in a degassed state. The packaged mold is placed in a pressurized container of an isotropic hydrostatic press forming apparatus, and is pressed by a pressurized medium to perform press forming.

After the pressing, the isotropic hydrostatic pressing mold is taken out of the isotropic hydrostatic pressing apparatus, and the first lid 3a, the second lid 3b and the cylindrical part 2 are separated. As shown,
A molded body 10 having a shape in which the glass rod 6 penetrating through the inside of the ceramic molded body 9 protrudes from both ends of the columnar ceramic molded body 9 in which the ceramic powder is pressure-molded into a columnar shape.

The glass rods 6 projecting from both ends of the ceramic molded body 9 are not broken even in the ceramic molded body.

As described above, the theoretical reason why the glass rod does not break in the ceramic molded body when the isotropic hydrostatic pressing mold of the present invention is used is not clear yet.

The present inventors believe that the glass rod will not be broken for the following reasons. That is, when isotropic hydrostatic pressure is applied to the molding die, the ceramic in the cylindrical member is tightened in the radial direction and also in the axial direction. By tightening in the axial direction,
Although shear stress due to ceramic powder is applied to the glass rod, pressure is also applied to both end surfaces of the glass rod, so it is estimated that the glass rod does not break due to the shear stress.

By the way, in the present invention, the isotropic hydrostatic pressurizing mold has the above-described cylindrical portion, the first lid portion, and the second lid portion, but is not limited to this example. Can be mentioned.

For example, as shown in FIG. 4, it has a bottomed circular cylindrical portion 11a and a closed circular cylindrical portion 11b. The circular cylindrical portion 11a has a first center member insertion hole 12a on the bottom surface thereof and an opening thereof is a closed circular cylindrical portion 1a.
It has an inner fitting portion 13a fitted into the opening 1b. The covered circular cylindrical portion 11b has a second central member insertion hole 12b and a powder supply hole 14 at the center of the plane serving as the lid, and the lower opening of the circular cylindrical portion 11b has It has an outer fitting portion 13b that fits into the inner fitting portion 13a. The powder supply hole 14 has a mortar-shaped tapered surface from the outside to the inside of the circular cylindrical portion 11b, and a lid member 15 is attached thereto.

In this embodiment, in comparison with the embodiment shown in FIG. 1, the covered cylindrical portion in FIG.
The first tubular portion and the first lid portion obtained by dividing the tubular portion in FIG. 1 into a first tubular portion and a second tubular portion are integrally formed, and the bottomed tubular portion in FIG. The first cylindrical portion and the second cylindrical portion are divided into a first cylindrical portion and a second cylindrical portion, and the second cylindrical portion and the second lid portion are integrally formed.

In this embodiment, the circular cylindrical portion 11a
A glass rod is inserted into the first central member insertion hole 12a so that the front end surface thereof substantially coincides with the outer surface of the bottomed cylindrical portion 11a.
insert. Next, the outer fitting portion 13 is attached to the inner fitting portion 13a.
Then, the bottomed tubular portion 11a and the covered tubular portion 11b are integrally mounted so as to be fitted with b. Next, the powder supply hole 1
The ceramic powder is supplied from 4 to fill the ceramic powder in the internal space formed by the bottomed tubular portion 11a and the covered tubular portion 11b. Next, the powder supply hole 14 is covered with a cover member.

The subsequent operation is the same as in the case of the isostatic pressing type shown in the nest 1.

Also in this embodiment, as shown in FIG. 3, the glass rod 6 protrudes from both ends of the columnar ceramic molded body 9 in which the ceramic powder is pressed into a column without damaging the glass rod. A shaped body 10 is obtained.

The isotropic hydrostatic pressurizing mold shown in FIG. 5 is another embodiment of the present invention.

The isotropic hydrostatic pressurizing mold shown in FIG. 5 has a circular bottomed cylindrical portion 16 and a lid 17 attached to the opening thereof. The bottomed cylindrical portion 16 is located at the center of the bottom surface.
The center member insertion hole 18 is formed. The lid 17 has a center member insertion hole 19 formed at the center thereof, and a fitting mounting portion 20 that fits into the upper opening of the bottomed cylindrical portion 16 protrudingly formed on the lower surface.

Using this isostatic pressing mold, pressure molding is performed as follows. That is, the tip of the glass rod 6 is inserted into the center insertion hole 18 of the bottomed cylindrical portion 16. At the time of insertion, the tip of the glass rod 6 is prevented from protruding from the central member insertion hole 18. Next, the inside of the bottomed cylindrical portion 16 is filled with ceramic powder. Then, the tip of the glass rod 6 protruding from the upper opening of the bottomed cylindrical portion 16 is inserted into the center member insertion hole 19 of the lid portion 17 and the fitting mounting portion 20 is placed above the cylindrical portion 16. Fit into the opening. As a result, the lid 17 is attached to the cylindrical portion 16.
A ceramic mold is filled in the inner space formed by mounting the glass rod, and the molding die is obtained by inserting the glass rod 6 into the central member insertion holes 18 and 19.

The procedure for isostatic pressing under pressure using this mold is the same as that for the isostatic pressing mold shown in FIG.

In this embodiment, as compared with the embodiment shown in FIG. 1, the covered cylindrical portion in FIG.
Are formed integrally with each other, and the lid in FIG. 5 has a relationship corresponding to the first lid in FIG.

In the above embodiment, the center member insertion hole provided in the lid portion is a simple through hole, but may have a shape as shown in FIG. That is, in the lid portion 21 shown in FIG. A central member insertion hole 24 including a hole 23 is provided. A cover member 25 is attached to the center member insertion hole 24.

The center member insertion hole 24 having such a shape is formed such that the tip of a glass rod inserted into the center member insertion hole 24 when the lid is attached to both ends of the cylindrical portion. This is effective when it is located in the central member insertion hole 24 far below the outer surface of the lid. That is, even when the tip of the glass rod is located inside the center member insertion hole and far below the opening surface of the center member insertion hole, the end face of the glass rod is subjected to isotropic pressing. Hydrostatic pressure is applied without difficulty, and the reason is not clear, but without damaging the glass rod, as shown in FIG. 3, the ceramic powder is pressed from both ends of the columnar ceramic molded body 9 into a columnar shape. A molded body 10 having a shape in which the glass rod 6 protrudes is obtained.

FIG. 7 shows another embodiment of the present invention. FIG.
The isotropic hydrostatic pressurizing die shown in FIG.
6a and a second lid 26b. The cylindrical portion 25 is a cylindrical body having openings at both ends. This cylindrical portion 25 is formed of a hard rubber member. The first lid 26a has a circular shape when viewed from the top in FIG. 7, and has a circular first central member insertion hole 27a at the center thereof. A first fitting mounting portion 28a that fits into the cylindrical portion 25 is formed to protrude from the lower surface of the first lid portion 26a, and a supporting member is supported on an edge of the lower surface of the first lid portion 26a. A flange 29a is provided. On the other hand, the second lid 26b has the same shape as the first lid 26a. That is,
In the second lid portion 26b, reference numeral 27b denotes a second central member insertion hole, reference numeral 28b denotes a second fitting portion, and reference numeral 29b denotes a flange portion.

The support members 30a and 30b are mounted on the outer periphery of the cylindrical portion 25 so as to have a slight gap from the outer peripheral surface. The support member has an inner arc surface 31 having an inner diameter larger than the outer diameter of the cylindrical portion 25, and the inner circumference of the inner arc surface 31 is formed by a semicircular arc formed by the radius of the inner circumference. It is designed to be shorter. Therefore, when the pair of support members 30a and 30b are mounted on the outer side of the cylindrical portion 25, as shown in FIG.
Is formed.

This isotropic hydrostatic pressurizing die is used to perform a press forming operation as follows. That is, the cylindrical portion 25 is set up, and the second lid portion 26b is fitted and mounted in the opening below the cylindrical portion 25. The support members 30a, 3
0b is attached. Next, the glass rod 6 is inserted into the second central member insertion hole 27b of the second lid 26b such that the tip of the glass rod 6 in the insertion direction coincides with the outer surface of the second lid 26b. When the glass rod 6 is inserted in such a manner, the glass rod 6 is erected inside the cylindrical portion 25, and the tip of the glass rod 6 on the opposite side to the one inserted into the second lid portion 26b has the cylindrical portion. The other end projects from the opening. Next, the upright cylindrical portion 25 is filled with, for example, ceramic powder 7. After the filling, the tip protruding from the cylindrical portion 25 is passed through the first central member insertion hole 27a of the first lid portion 26a, and the first lid portion 26a is pushed down to form the cylindrical portion 25.
The fitting / fitting portion 28a is fitted to the opening at the other end of the material so as to seal it, and the first lid 26a is attached to the tubular portion 25. When attached, the first lid 26
In a of the first central member insertion hole 27a, the front end surface of the glass rod 6 coincides with the outer surface of the first lid portion 26a.

The forming and pressurizing operation using the isotropic hydrostatic pressurizing mold is the same as the case using the isotropic isostatic pressurizing press in FIG. However, at the time of pressurization, the support member 30a
And 30b prevent the first lid 26a and the second lid 26b from being compressed and trying to approach each other, whereby the breakage of the glass rod 6 can be reliably prevented.

When the isostatic pressing is performed, the supporting member 30a and the supporting member 30b mounted on the outer periphery of the cylindrical portion 25 have a gap 32. As a result, it is possible to contact the outer periphery of the tubular portion 25, so that the isotropic hydrostatic pressure can be applied to the tubular portion 25 irrespective of the presence of the support members 30 a and 30 b.

The support member does not need to have a shape as shown in FIG. 8. In short, the support member is connected to the first lid mounted on the cylindrical portion by the pressure during pressure molding. There is no particular limitation as long as the second lid is prevented from approaching and the pressure medium is shaped so that pressure can be applied to the outer peripheral surface of the cylindrical part.

Therefore, the supporting member may be a cylindrical body having a large number of through holes on the peripheral surface, or a first lid and a second lid mounted on the opening at both ends of the cylindrical part. It may be a rod-shaped body interposed in the form of a fence.

[0042]

According to the present invention, a brittle rod protrudes from both ends of a columnar powder compact formed by pressing a powder such as a ceramic powder into a column without damaging a brittle rod such as a glass rod. Thus, a molded article having the following shape can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view showing a state in which the isotropic hydrostatic pressing mold shown in FIG. 1 is filled with powder, a glass rod is mounted, and the whole is vacuum-packaged in a bag.

FIG. 3 is an explanatory sectional view showing an example of a press-formed body that can be formed by the method of the present invention.

FIG. 4 is an explanatory sectional view showing another embodiment of the present invention.

FIG. 5 is an explanatory sectional view showing another embodiment of the present invention.

FIG. 6 is an explanatory cross-sectional view showing an example of a lid according to the present invention.

FIG. 7 is an explanatory sectional view showing another example of the present invention.

FIG. 8 is a perspective view showing a support member used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Isotropic hydrostatic pressure press type 2 Cylindrical part 3a 1st lid 3b 2nd lid 4a 1st center member insertion hole 4b 2nd center member insertion hole 5a, 5b Fitting attachment part 6 Glass rod 7 Ceramics Powder 8 Bag made of plastic sheet 9 Ceramic molded body 10 Molded body 11a Circular cylindrical part with bottom 11b Circular cylindrical part with lid 12a First central member insertion hole 12b Second central member insertion hole 13a Inner fitting part 13b Outer fitting portion 14 Powder supply hole 15 Cover member 16 Bottom cylindrical portion 17 Cover portion 18 Center member insertion hole 19 Center member insertion hole 20 Fitting mounting portion 21 Cover portion 22 Pot-shaped opening 23 Through hole 24 Central member insertion hole 25 Cylindrical part 26a First cover 26b Second cover 27a First center member insertion hole 27b Second center member insertion hole 28a First fitting mounting portion 28b Second fitting Fitting part 9a, 29 b flange portion 30a, 30b support member

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Claims (7)

(57) [Claims] A first lid portion and a second lid portion each of which has a tubular member and a central member insertion hole which closes both end openings of the tubular portion and shares a central axis of the tubular portion. A central member from the central member insertion hole of each of the first lid portion and the second lid portion having the cylindrical portion filled with powder and closing the opening of the cylindrical portion, to the other central member insertion hole. A mold for isostatic pressing under pressure that allows for isostatic pressing under pressure. 2. A tubular portion is separable into a first tubular portion and a second tubular portion, the first tubular portion and the first lid are integrally formed, and the second tubular portion and the second tubular portion are separated from each other. The isotropic hydrostatic pressurizing die according to claim 1, wherein the second lid portion is integrally formed. 3. A first cylinder having a cylindrical portion and an opening at one end thereof closed.
2. The isotropic isostatic pressurizing mold according to claim 1, wherein the lid and the lid are integrally formed. 4. The isostatic pressurizing die according to claim 1, wherein the center member insertion hole has an inner opening and an outer opening of the lid having the same shape. 5. The isostatic pressurizing die according to claim 1, wherein the center member insertion hole has an opening area whose outer opening in the lid has a larger area than the inner opening. 6. The isostatic pressurizing die according to claim 1, wherein the first lid and the second lid are provided with a support member disposed outside the cylindrical portion. . 7. A cylindrical portion and an opening at both ends of the cylindrical portion are closed.
And a central member insertion hole sharing the axis of the cylindrical portion.
And a first lid and a second lid respectively having
The first lid and the second lid are placed in a mold for isostatic pressing.
Insert the center member into the hole for inserting the center member
Fill the powder into the isostatic pressurization mold and use it for isostatic pressurization.
A method for producing a press-formed body, comprising pressurizing a mold.