JPH0739508Y2 - Wet isotropic pressure press material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a wet method used for producing a thin ring-shaped molded body from ceramic powder, metal powder, superhard powder and plastic powder, or a mixed powder thereof. The present invention relates to a mold material for isotropic pressure application.

(Prior Art) Conventionally, when a thin plate-shaped ring molded body is manufactured from the above-mentioned powder by wet isotropic pressure press molding using a wet isotropic pressure press, the following method has been adopted.

That is, as shown in FIG. 13, a wet type in which upper and lower lids (rubber molds) 2 and 3 are fitted in the upper and lower openings of a cylindrical body (rubber mold) 1 and a mandrel 4 is concentrically arranged inside thereof. After the powder 7 is filled in the cavity 6 of the mold material 5 for isotropic pressure pressurization, the powder is set in a wet isostatic pressurizing device to perform wet isostatic press molding. Then, as shown in FIG. 14, first, a cylindrical molded body 8 is created, and then this molded body 8 is cut with a tool 9 to a predetermined thickness and then machined to a predetermined thickness. A thin plate-shaped ring molded body 10 was manufactured.

(Problems to be solved by the invention) In the prior art, after forming a cylindrical molded body 8 by wet isotropic pressure molding, it is machined to a predetermined thickness to form a thin disk-shaped ring. Since the body 10 was manufactured, the following drawbacks were recognized.

During machining, minute cracks were generated on the surface of the ring molded body 10 and the life of the ring molded body 10 itself was significantly reduced.

The yield was not good because a considerable cutting allowance was required when processing the cylindrical shaped body 8 to a predetermined thickness.

In the case of difficult-to-machine materials, it took a considerable amount of machining time and the work efficiency was poor.

If the final product had a complicated surface shape, machining was difficult.

It took time to increase the surface roughness of the ring molded body 10 by machining.

The surface roughness could not be increased depending on the material of the ring molded body 10.

To solve these problems, it is conceivable to directly produce a thin plate-shaped ring molded body by itself. However, since the powder molded body is brittle and easily damaged, a thin plate-shaped ring molded body with a large contact area between the mold material and the molded body is available. When manufacturing a body, there is a problem that the ring-shaped molded body firmly adheres to the mold material by isotropic pressure pressurization and damages the molded body when removing the molded body from the mold material. A method of producing a ring-shaped molded body by cutting after forming the body has been adopted.

In view of this point, the present invention enables a mold member to be easily removed without causing cracks or the like when the molded member is removed from the mold member, and a thin plate-shaped ring molded member can be directly formed by wet isostatic pressing. An object is to provide a mold material for wet isotropic pressure pressurization that can be manufactured by itself.

(Means for Solving the Problem) A wet isotropic pressure pressurizing mold material according to the present invention has a short columnar first mold member 11 and a height lower than the height of the first mold member 11, and An annular second mold member 14 whose inner peripheral shape is the same as the outer peripheral shape of the first mold member 11 and whose ring section has a rectangular cross section, and a height of the first mold member 11 And a ring-shaped third mold member 17 having the same height and the same inner peripheral shape as the outer peripheral shape of the second mold member 14 and the ring section of which has a rectangular cross section. , A die 20 assembled and assembled with each other so that their bottom surfaces are on the same plane, and the first die member 11 constituting the die 20.
And a flat rubber lid 22 arranged in contact with both upper surfaces of the third mold member 17 to form a molded product cavity 23, and a bottom plate arranged in contact with the bottom surface of the mold 20. It has 21.

Also, the wet isotropic pressure press die according to the present invention has a protrusion 12 or a notch formed on the outer peripheral surface near the bottom surface of the first mold member 11 and near the bottom surface of the second mold member 14. A notch portion 15 or a protrusion portion is formed on the inner peripheral surface of the first mold member.
11 and the second mold member 14 include the protrusion 12 and the cutout 15
And the third mold member 17 can be engaged with each other.
A protrusion 18 or a notch is formed on the inner peripheral surface near the bottom surface of the second mold member 14, and a notch is formed on the outer peripheral surface near the bottom surface of the second mold member 14.
16 or a protrusion is formed so that the third mold member 17 and the second mold member 14 can engage with each other at the protrusion 18 and the notch 16.

Furthermore, the wet isostatic press die according to the present invention has a tapered notch portion on the outer peripheral surface of the end of the first die member 11 on the rubber lid 22 side.
In addition to the above, the third mold member 17 has a tapered notch portion 19 on the inner peripheral surface of the end portion on the rubber lid 22 side.

(Operation) When the thin plate-shaped ring molded body 25 is manufactured, after the powder 24 is filled in the cavity 23 of the mold 20, it is put in a wet isotropic pressure press and wet isotropic pressure molding is performed. To do. After the molding, the rubber lid 22 and the bottom plate 21 are removed, and then the mold 20 is formed in the order of, for example, the first mold member 11, the third mold member 17, and the second mold member 14.
Then, the ring-shaped molded body 25 having a thin plate shape is obtained. Therefore,
Since the mold 20 can be easily removed, the mold does not get cracked.
The ring molding 25 can be separated from 20. Further, since it is a split type, it is possible to improve the surface accuracy of the surfaces of the mold members 11, 14, 17 that are in contact with the ring molded body 25, and the surface accuracy of the ring molded body 25 is improved.

(Embodiment) Hereinafter, an embodiment of a wet isostatic pressing die according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 11 is a short pillar-shaped first mold member, in which a protrusion 12 is formed in the circumferential direction on the outer peripheral surface near the bottom surface, and the outer peripheral surface near the upper surface has a gradient of about 15 degrees. A tapered notch 13 is formed. 14 is a thin plate ring-shaped second
The second mold member 14 is a mold member whose height is lower than that of the first mold member 11 and whose inner peripheral surface is the first mold member.
It has the same shape as the outer peripheral shape near the bottom surface of 11. Then, on the inner peripheral surface near the bottom surface of the second mold member 14, a notch portion 15 which can engage with the protrusion 12 of the first mold member 11 is formed in the circumferential direction, and near the bottom surface. A notch 16 is formed on the outer peripheral surface in the circumferential direction. Reference numeral 17 denotes a ring-shaped third mold member, and the third mold member 17 has a height equal to that of the first mold member 11 and an inner peripheral shape near the bottom surface thereof is the second mold member. It has the same shape as the outer peripheral shape of 14. Then, on the inner peripheral surface in the vicinity of the bottom surface of the third mold member 17, there are circumferentially formed projections 18 capable of engaging with the notches 16 of the second mold member 14, and in the vicinity of the upper surface. A tapered notch portion 19 that widens upward is formed on the inner peripheral surface.

The first to third mold members 11, 14 and 17 are assembled by concentrically fitting and assembling each other so that their bottom surfaces lie on a circle.
The mold 20 is set on the bottom plate 21 so that the bottom surface of the mold 20 contacts the top surface thereof. Reference numeral 22 denotes a flat rubber lid, which is arranged in contact with the upper surfaces of the first and second mold members 11 and 17, and the rubber lid 22 and the first to third mold members 11 and 1 of the mold 20.
A molded product cavity 23 is formed by 4,17. twenty four
Is the powder filled in the cavity 23. The mold
The surfaces of the first to third mold members 20, 20 contacting the powder 24 are
It is mirror finished with buff or paper and has good surface accuracy.

When manufacturing the thin disk-shaped ring molded body 25,
After the powder 24 is filled in the cavities 23 of 20, the openings of the cavities 23 are closed with a rubber lid 22, and a vinyl tape is wrapped around the outer periphery to sufficiently seal the cavities. Next, this is put into a wet isotropic pressure press and molded. The molding condition at this time is 1000 pressure.
Hold kgf / cm ² × 1min. After the wet isostatic pressing, the mold 20 is disassembled in a predetermined order to form a thin disk-shaped ring molding 25.
Take out.

When the ring molded body 25 is taken out, the work is performed in the next step. After the wet isostatic pressing, the vinyl tape is first peeled off, and the rubber lid 22 and the bottom plate 21 are removed as shown in FIG. Next, as shown in FIG. 3, a ring-shaped take-out jig 26 having an inner diameter larger than the outer diameter of the first die member 11 is used, and the take-out jig 26 is laid under the die 20, Even pressure is applied to only the first mold member 11 from above, and the first mold member 11 is pulled out downward. Then, the fourth
As shown in the figure, a ring-shaped take-out jig 27 having an outer diameter smaller than the inner diameter of the third mold member 17 is used.
Apply even pressure from above and drop down. Then, finally, as shown in FIG. 5, the second mold member 14 is slid in the horizontal direction and separated to obtain a ring molded body 25 as shown in FIG.

When the mold material of the embodiment is used in this manner, the following advantages can be obtained.

After the wet isostatic pressing, the mold material can be disassembled and easily removed from the ring molded body 25. Therefore, the link molded body 25 does not crack when taken out, and can be manufactured by wet isotropic pressure molding for each individual unit.

Since no minute cracks are generated on the surface of the ring molded body 25, the life of the ring molded body 25 is dramatically improved, and cracks do not occur even during the sintering in the subsequent process.

Thin disk-shaped ring molding 25 after wet isostatic pressing
Since only a slight finishing process is applied to the product, the yield is very good.

Except for the final finishing, almost no machining is performed, so that the production efficiency is improved especially in the case of difficult-to-machine materials.

Even if the surface shape is complicated, it can be molded in the same time as a normal one.

By increasing the surface roughness of the mold 20, the ring molding 25
It is possible to improve the mold releasability and improve the surface roughness that could not be increased by machining. .

In the embodiment, the protrusions 12, 12 are formed on the first and second mold members 11, 17.
Although the cutout portions 15 and 16 are provided in the second mold member 14 and 18, respectively, this may be reversed. Also, the protrusions 12, 18,
The notches 15 and 16 need only be engageable with each other so that the mold members 11, 14 and 17 are not disassembled unexpectedly during handling, and therefore their shapes are as shown in FIGS. 7 and 8. It may be one.

Further, each mold member 11, 14, 17 may be as shown in FIG. That is, in this case, the first mold member 11 has a columnar shape, and the second mold member 14 and the third mold member 17 have a rectangular ring section. In this way the mold members 11,14,17
Since they are placed on the bottom plate 21 and handled, they may be structured so as not to engage with each other.

Further, the bottom plate 21 may not be provided on the entire bottom surface of the mold 20, and may have a partial structure corresponding to the fitting portion of each mold member 11, 14, 17 as shown in FIG.

The ring molded body 25 is not limited to the thin disk shape, and can be similarly manufactured even if it has a polygonal shape as shown in FIG. 11 or an elliptical shape as shown in FIG.

Further, a tapered notch 13 is formed on the outer peripheral surface of the first mold member 11 on the rubber lid 22 side, and the taper is formed on the inner peripheral surface of the third mold member 17 on the rubber lid 22 side. By forming the notch 19 in the shape of a circle, the first and third mold members 11 and 17 can be easily removed from the molded body 25.

(Effects of the Invention) According to the present invention, a short columnar first mold member 11 and a height lower than a height of the first mold member 11 and an inner peripheral shape thereof are the first mold member. An annular second mold member 14 having the same outer peripheral shape as that of 11 and a rectangular ring section.
And the height of the first mold member 11 is equal to the height thereof, the inner peripheral shape thereof is the same as the outer peripheral shape of the second mold member 14, and the ring portion has a rectangular cross section. A die 20 formed by fitting and assembling a ring-shaped third die member 17 so that respective bottom surfaces thereof are on the same plane, and the die.
A mold cavity 23 is formed by a flat rubber lid 22 that is placed in contact with both upper surfaces of the first mold member 11 and the third mold member 17 that form the mold 20, and the mold cavity 23 is formed. Since the bottom plate 21 is provided so as to be in contact with the bottom surface of the mold 20, the mold material can be easily removed after the wet isostatic pressing, and the molded body 25 does not crack at that time. Further, since it is a split type, it is easy to increase the surface accuracy of each mold member 11, 14, 17 of the mold 20, and the mold releasability of the molded body 25 is improved,
The surface roughness of the molded body 25 is improved.

Moreover, in the present invention, the protrusion 12 or the notch is formed on the outer peripheral surface near the bottom surface of the first mold member 11,
A notch portion 15 or a protrusion portion is formed on the inner peripheral surface near the bottom surface of the mold member 14, and the first mold member 11 and the second mold member are formed.
14, and the protrusion 12 and the notch 15 can be engaged with each other, and the protrusion 18 or the notch is formed on the inner peripheral surface near the bottom surface of the third mold member 17, Second mold member
A notch portion 16 or a protrusion portion is formed on the outer peripheral surface near the bottom surface of 14, and the third mold member 17 and the second mold member 14 are
Since the projection 18 and the notch 16 can be engaged with each other, the mold members 11, 14, 17 are not disassembled accidentally when the mold 20 is handled, and the handling is facilitated.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a cross-sectional view of a mold material, FIGS. 2 to 6 are cross-sectional views showing a step of taking out a molded body, and FIG. And FIG. 8 is a sectional view showing a modified example of the engaging portion of the present invention, FIGS. 9 and 10 are sectional views showing a modified example of the same mold material, and FIGS. 11 and 12 are modified versions of the molded body. FIG. 13 is a perspective view showing an example, and FIGS. 13 and 14 are sectional views showing a conventional example. 11 …… First mold member, 12,18 …… Projection part, 13,15,16,19…
… Notches, 14 …… Second mold member, 17 …… Third mold member, 20 …… Mold, 21 …… Bottom plate, 22 …… Rubber lid, 23 …… Molded product cavity, 25 …… Ring molded body.

Claims (2)

[Scope of utility model registration request] 1. A short pillar-shaped first mold member (11), which has a height lower than that of the first mold member (11) and an inner peripheral shape of which is the first mold member (11). ) An annular second ring having the same outer peripheral shape and a rectangular ring section.
The height of the mold member (14) is equal to the height of the first mold member (11), and the inner peripheral shape is the same as the outer peripheral shape of the second mold member (14), and A ring-shaped third mold member (17) having a rectangular cross section of the ring portion,
A mold (20) assembled and assembled so that their respective bottom surfaces are on the same plane, and the first mold member (11) and the third mold member (11) that compose the mold (20). 17) is formed by forming a molded product cavity (23) with a flat rubber lid (22) arranged in contact with both upper surfaces of the mold 17 and arranged in contact with the bottom surface of the mold (20). A wet isostatic pressing material having a bottom plate (21). 2. A protrusion (12) or a notch is formed on the outer peripheral surface near the bottom surface of the first mold member (11),
A notch (15) or a protrusion is formed on the inner peripheral surface near the bottom surface of the mold member (14), and the first mold member (11) and the second mold member (14) are The protrusion (12) and the notch (15) are engageable with each other, and the protrusion (18) or the notch is formed on the inner peripheral surface near the bottom surface of the third mold member 17, A notch (16) or a protrusion is formed on the outer peripheral surface near the bottom surface of the second mold member (14), and the third mold member (17) and the second mold member (14) are separated from each other. The mold for wet isotropic pressure pressurization according to claim 1, wherein the projection (18) and the notch (16) can be engaged with each other.