Powder metallurgy processes – Forming articles by uniting randomly associated metal particles – Consolidation of powders
Patent
1994-06-30
1996-02-13
Walsh, Donald P.
Powder metallurgy processes
Forming articles by uniting randomly associated metal particles
Consolidation of powders
419 66, B22F 302, B22F 500
Patent
active
054909694
ABSTRACT:
Methods for forming compacts having reduced elephant's feet effect are disclosed. The apparatus utilized includes a press for dry bag isostatic pressing, the press body having a cavity with at least one open end formed therein, an elastic mould, operatively positioned inside the cavity for compacting metal powder, means, operatively connected to the mould for expanding the mould and compacting the metal powder, and at least one press member having a base section substantially normal to the cavity and an insert section extending from base section into the cavity, the insert section being formed in the shape of any one of a plurality of geometric shapes. The method comprises depositing a metal powder in the cavity of a cold isostatic press, sealing at least one end of the cavity with a punch having a section substantially normal to the cavity and an insert section having any one of a plurality of geometric shapes extending from the base section into the cavity, applying pressure to the outer surface of the mould, decompressing the mould by reducing the pressure applied in a controlled manner and removing the resulting compact from the mould, the compact having a taper applied to at least one end which reduces the elephant's foot effect.
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"Tooling for Cold Isostatic Pressing," KJ Morris, Isostatic Pressing Technology, edited by PJ James, Applied Science Publishers, New York, Chapter 4, pp. 91-119.
Bewlay Bernard P.
Dalpe Dennis J.
Bluni Scott T.
General Electric Company
Magee Jr. James
Payne R. Thomas
Walsh Donald P.
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