Claims
- 1. A method of making shaped articles from sinterable powder which comprises (a) introducing said powder into a cup mold composed of organic polymeric material selected from the group consisting of nylon, cellulose, acetate, polymethylmethacrylate, polypropylene, and polyethylene, with an inner surface configuration corresponding to the outer surface configuration desired in the shaped article, said cup mold being supported by a metal mold support, (b) positioning a metallic plunger, having a shank contoured to have a snug fit in said mold, so as to make contact with the powder, (c) subjecting the powder mold, mold support, and plunger to centrifugal force to compress the powder against the inner wall of said mold, (d) removing said polymeric mold with shaped compressed powder from said mold support, (e) heating said mold and compressed powder to vaporize said mold and (f) further heating to sinter said shaped compressed powder.
- 2. The method of claim 1 wherein the organic polymeric material is polyethylene.
- 3. The method of claim 1 wherein the plunger has an enlarged head portion.
- 4. The method of claim 3 wherein the plunger has a face composed of cemented tungsten carbide.
- 5. The method of claim 4 wherein the face of the plunger is contoured to mold the surface of the powder with which it makes contact.
- 6. The method of claim 5 wherein the face of the plunger is contoured to chamfer the powder article.
Parent Case Info
This is a continuation, of application Ser. No. 713,569, filed Aug. 11, 1976, now abandoned which is a continuation of Ser. No. 337,581, Mar. 2, 1973.
US Referenced Citations (3)
Continuations (2)
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Number |
Date |
Country |
Parent |
713569 |
Aug 1976 |
|
Parent |
337581 |
Mar 1973 |
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