Method for forming compacts

Details Method for forming compacts Method for forming compacts

1998-12-18

2000-06-27

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 38, B22F 312

Patent

active

060803584

ABSTRACT:
There is disclosed a method for forming compacts having a hole extending along a direction crossing the compressing direction. In the method, a powder or a pre-compressed compact and a core for forming a hole are assembled in a cavity. The core and a die are set in a condition that the core can move in the compressing direction. The punch compresses the powder and forms a compact. The core does not engage with the die, whereby the core is not exerted with load. Therefore, the method does not need control of compressing for avoiding exertion of load on the core, and can prevent transformation or break of the core. The compact in which the core is inserted is drawn out from the die, so that damages such as break or crumble of the compact is prevented in drawing out.

REFERENCES:
patent: 4111031 (1978-09-01), Vennemeyer et al.
patent: 4145798 (1979-03-01), Sarnes
patent: 4435359 (1984-03-01), Eiselstein et al.
patent: 4853180 (1989-08-01), Howard
patent: 5543235 (1996-08-01), Mirchandani et al.
patent: 5710969 (1998-01-01), Newman

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