JPS6289600A - Forming jig for hollow compressed object by cold isotropic hydrostatic pressure - Google Patents

Abstract

PURPOSE:To improve the uniformity of compression, and also to improve the dimension accuracy of the inside diameter of a hollow part by packing a powder into a packing chamber which has been formed by an outer tube of rubber and an inner tube of Al or an Al alloy, and fixing both ends in a water-tight state by a cover of rubber. CONSTITUTION:One end part of an inner tube 15 is pushed into a through-hole 18 of one cover 17 and both of them are fixed. Subsequently, in order to hold the airtightness onto a contact part of a tail end face of an outer tube 14 and the cover 17, a vinyl tape is wound, and thereafter, a vibration is applied to a jig, and a powder of Al or its alloy is packed in a space of the inner tube 15 and the outer tube 14. Next, the other cover 16 is pushed into the other end part of the inner tube 15 and coupled to the inner tube 15, and also the vinyl tape is wound to this part. Thereafter, a hollow compressed object is formed by applying a cold isotropic hydrostatic pressure. In this way, a product whose dimension accuracy is excellent can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a jig used for forming aluminum or its alloy powder into a hollow compressed product by cold isostatic isostatic pressure (hereinafter referred to as CIP). It is related to.

BACKGROUND ART Conventionally, the following jigs have been used when molding a hollow metal powder compact by CIP.

That is, as shown in FIG. 2, carbon steel (S50C) is placed inside the pipe 1 made of large diameter rubber! 4, and insert the rubber pipe 1 and the mandrel 2 at both ends,
It is fixed with covers 3 and 4 made of carbon steel (S50C) so that the space formed by the rubber pipe 1, the mandrel 2, and the covers 3.4 on both sides becomes a metal/powder filling chamber 5. , the top surface of the joint between the rubber pipes 1 and 3 and 4 is wrapped with a wire band 6, and a halved steel guide 7 is attached to prevent the lid 3.4 from bending due to pressure during compression molding. It is constructed so as to cover the outer surface of the rubber pipe 1 and to be attached to lids 3 and 4 on both sides at both ends thereof.

In addition, as shown in Fig. 3, a rubber inner tube 9 is inserted into the rubber outer tube 8, and the outer tube 8 and the inner tube 9 are placed at their respective ends, and the center The space formed by the outer tube 8, the inner tube 9 and the tubes 11 and 12 is fixed with a blind hole 10 into which the end of the inner tube 9 can be inserted, and the space formed by the outer tube 8, the inner tube 9 and the tubes 11 and 12 is filled with powder such as metal. There is an all-rubber jig that serves as a filling chamber 13.

Problems that Ming attempts to solve With the conventional jig shown in Figure 2, it took time to assemble the jig, especially to tighten the rubber pipe and the lid with a wire band, and the workability was not good. In addition, because the frictional force between the mandrel and the compressed powder material is large, it is difficult to handle the mandrel after compression molding is completed, and when removing the compacted material from the jig while leaving the mandrel in place, it is difficult to handle the mandrel after compression molding. , which often damaged compressed materials. Furthermore, when the guide came off the lid, pressure was applied unevenly, causing the lid to buckle and break.

On the other hand, with the all-rubber type jig shown in Figure 3, the contact area between the lid and the outer tube or inner tube is small, so when the rubber of these tubes and the lid material restores itself during pressure reduction, the lid is handled more easily than the jig. Water penetrated into some of the compressed materials. Furthermore, since the inner tube is made of rubber, the inner diameter of the compressed product varies and the inner surface of the hollow portion becomes flat, making it difficult to fit the inner tube of aluminum or its alloy into the hollow portion during billet production.

Therefore, the object of the present invention is to provide a jig that has good workability during assembly, watertightness, and uniform compressibility as a jig for forming hollow compressed products such as aluminum or its alloy powder by CIP. The object of the present invention is to provide the above-mentioned problems.

Means for Solving the Problems The present invention is a jig for forming a hollow compressed product of aluminum or its alloy powder by CIP, and in order to achieve the above object, it is constructed as follows.

That is, an outer tube made of rubber and an inner tube made of aluminum or its alloy, which is relatively longer than the length of the outer tube, are made of rubber having through holes at both ends into which the ends of the inner tube are inserted. The filling chamber is fixed in a watertight state by a lid, and a filling chamber is sealed on both sides by the lid.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Embodiment FIG. 1 shows an embodiment of the present invention, in which 14 is an outer tube (outer diameter 250 mm, length 500 mm) made of rubber having appropriate elasticity and rigidity, for example, synthetic rubber whose main component is polybutadiene. , 15 is aluminum alloy (A60
63) inner tube (outer diameter 66 mm, length 640 mm) >
16.17 is a lid made of rubber, and in its center is a through hole 1 into which the end of the inner tube 15 is inserted.
It has 8. The front half of this hole 18 is located inside a protruding portion 19 of the lid (outer diameter 106 mm, width 50 mm).

The outer tube 14 and the inner tube 15 have rubber lids 16 at both ends.
．． It is fixed by 17. Rubber! 16. The space between the outer tube 14 and the inner tube 15, which are sealed on both sides at 17, is
This is a chamber 20 filled with powder of aluminum or its alloy to be formed.

The rubber outer tube 14 is a jig member that determines the outer diameter of the compressed powder material. The wall thickness is approximately 10 mm, and the inner diameter and length are CI
Determine by considering the amount of shrinkage after P molding.

In particular, the length should be the billet length plus the length 11 of the contact area with the lid, considering the water tightness with the lid 16 and 17.

The inner tube 15 made of aluminum alloy is a jig member that determines the inner diameter of the hollow compressed product. The material to be used is one with good workability, such as A 6063. After powder compression molding, this inner tube 15 is used as it is as an inner tube of a billet. The wall thickness is approximately 2 mm to be suitable for container welding in the subsequent process, and the length is the length of the contact part with billet length J22.
shall be added.

Rubber M 16.17 is a jig member that fixes the outer tube 14 and the inner tube 15 to maintain watertightness. Considering watertightness,
It is preferable that the through hole 18 has a clearance of 0 with respect to the inner tube 15 and a clearance of about 1 mm at the contact portion with the outer tube. When assembling with the outer tube 14, the ends of the outer tube 14 are expanded. In addition, the length of the through hole 18, that is, λ
2 is set to ioomm in consideration of watertightness with the inner pipe 13, and the contact length ρ1 with the outer pipe 14 is set to 30mm in consideration of watertightness with the outer pipe.

Next, the procedure for assembling the jig will be explained.

(1) One end of the inner tube 15 is pushed into the through hole 18 of one lid, for example 17, and the inner tube 15 and the lid 17 are fixed.

At this time, the end surface of the inner tube 15 should be aligned with the end surface of the protrusion 19.

(2) Fit the outer tube 14 into the lid 17 while expanding its end. Next, the vinyl tape is wrapped around the vinyl tape several times while applying tension so as to cover the contact portion between the end surface of the outer tube 14 and the M17.

(3) The space between the inner tube 15 and the outer tube 14 is filled with powder of aluminum or its alloy. At this time, vibration is applied to the jig to ensure that the powder is filled uniformly and densely.

(4) Connect the other lid 16 to the inner tube 1 through its through hole 18.
5 into the other end to connect it to the inner tube 15.

Next, the other end of the outer tube 14 is widened, the M16 is pushed into the end of the outer tube 14, and tension is applied to the vinyl tape so as to cover the contact area between the end surface of the outer tube 14 and the lid 16. Wrap it around a few times while adding it.

The jig of the present invention can also be applied to compacting a composite powder of aluminum or its alloy and ceramic.

Effect of the invention The effects obtained by the present invention are as follows.

(1) To seal between the outer tube and the lid, there is no need to tighten a wire band or attach a halved guide, so the time required for this is saved and the efficiency of assembly is improved.

(2) Since there is no need to tighten the wire band as described above, the outer tube is not damaged and its lifespan is extended.

(3) Since there is no gap between the powder compact and the inner tube made of aluminum or its alloy, it can be used as it is as the inner tube of an extruded billet. Therefore, there is no need to strip off the inner tube after forming the compressed product, resulting in good workability.

(4) Since the contact area between the inner tube or outer tube and the lid is large, the sealing between them is strong, and therefore the jig has good watertightness.

(5) By using an inner tube made of aluminum or its alloy, uniform compression is achieved, and thereby the inner diameter of the hollow portion of the compressed product can be determined with high dimensional accuracy.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a jig according to the present invention, FIG. 2 is a cross-sectional view showing an example of a jig according to the conventional technology, and FIG.
The figure is a sectional view showing another example according to the prior art. 1... Rubber pipe, 2... Core metal, 3... Metal lid, 4
...Gold lid, 5...Powder filling chamber, 6...Wire band, 7...Guide, 8...Rubber outer tube, 9...Rubber inner tube, 10...Penetration Hole, 11...Rubber lid, 12
... Circulator, 13... Powder filling chamber, 14... Rubber outer tube, 15...
・Inner tube made of aluminum or its alloy, 16...Rubber lid, 17...Surrounder, 18...Through hole in the surround, 19...Protruding part, 2
0...Powder filling chamber. 5?1 Figure I Figure 2 Figures 3 and 3 Procedural Amendment (Import) November 7, 1985 Director General of the Patent Office Mr. Ka Michibe 1, Indication of Case Patent Application No. 1988-227893 2, Name of the Invention 4. Agent 5 attached an amendment order (on his own initiative) 6. Detailed explanation of the invention and drawings (Figures 2 and 3) in the specification subject to amendment 7. Contents of amendment m-4, (1 ) "1 rubber" on page 2, line 15 of the specification is "1° rubber"
I am corrected. (2) Change "Blind hole 10" in the 18th line to [Through hole 10J]
I am corrected. (3) "Restoration" on page 3, line 16 is corrected to "restoration." (4) At the end of the same line, "state of the day" is changed to "may become a state of affairs."
I am corrected. (5) Figures 2 and 3 are corrected as shown in the attached sheet.

Claims (1)

[Claims] An outer tube made of rubber and an inner tube made of aluminum or its alloy, which is relatively longer than the length of the outer tube, are placed at both ends thereof, and a rubber lid having a through hole into which the end of the inner tube is inserted is used. 1. A jig for forming a cold isostatically compressed hollow product, characterized in that the jig is configured to form a powder filling chamber which is fixed in a watertight state and whose both sides are sealed by the lid.