Claims
- 1. A method for subjecting a molded article comprised of a powder material and having a complicated shape to isostatic pressing, the method comprising the step of covering the molded article with a water impermeable rubber film having a thickness of 0.2-1 mm, the rubber film having a surface area larger than a surface area of the molded article.
- 2. A method according to claim 1, further comprising the step of drawing a vacuum inside of the rubber film.
- 3. A method according to claim 1, wherein the molded article is made substantially of a ceramic.
- 4. A method according to claim 1, wherein the molded article is made substantially of a metal.
- 5. A method according to claim 2, wherein the molded article is made substantially of a ceramic.
- 6. A method according to claim 2, wherein the molded article is made substantially of a metal.
- 7. A method for isostatically pressing a molded article, the method comprising the steps of:
- providing a molded article comprised of a powder material and having a complicated shape;
- covering said molded article with a rubber envelope, said rubber envelope being elastic and impermeable to a liquid medium used for cold isostatic pressing, said rubber envelope having a thickness of 0.2-1 mm and a surface area larger than a surface area of said molded article, and said rubber envelope having a shape selected from the group consisting of a bag shape having one open end and a tubular shape having a first open end, a second open end, and a hollow portion extending from said first open end to said second open end; and
- cold isostatically pressing said molded article with said rubber envelope in the liquid medium.
- 8. A method according to claim 7, further comprising, prior to the step of cold isostatic pressing, the step of applying a vacuum to the inside of said rubber envelope.
- 9. A method according to claim 7, wherein said molded article includes at least one of a notch, a throughhole, a dent, and a bend.
- 10. A method according to claim 7, wherein said molded article has a shaft and a plurality of blades extending outwardly from said shaft.
- 11. A method according to claim 7, wherein said molded article is comprised of a ceramic powder.
- 12. A method according to claim 7, wherein said molded article is comprised of a metallic powder.
- 13. A method according to claim 7, wherein said rubber envelope has said tubular shape.
- 14. A method according to claim 9, wherein said rubber envelope has said tubular shape.
- 15. A method according to claim 10, wherein said rubber envelope has said tubular shape.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-062588 |
Mar 1994 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/412,907, filed Mar. 29, 1995, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (5)
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Date |
Country |
0 133 515 A3 |
Feb 1985 |
EPX |
0 452 936 A2 |
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EPX |
1 608 363 |
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DEX |
41 17 415 A1 |
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470 256 |
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CHX |
Non-Patent Literature Citations (3)
Entry |
Hirschhorn, Joel S., "Introduction to Powder Metallurgy," 1969, pp. 107-109. |
ASM Handbook, vol. 7, Powder Metallurgy, 1984, pp. 434, 444-450. |
Popper, Paul "Isolated Pressing", Heyden & Son Ltd., Spectrum House, Chapt 4, pp. 33-43, 1976. |
Continuations (1)
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Number |
Date |
Country |
Parent |
412907 |
Mar 1995 |
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