Method of producing washer having boss

Details Method of producing washer having boss Method of producing washer having boss

1995-10-19

1997-08-19

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 38, 419 46, 419 55, 419 59, 470 41, 470 42, B22F 500, B22F 704

Patent

active

056598769

ABSTRACT:
A method for producing a washer having a boss comprises the following steps in the sequence set forth: (a) sprinkling powder of a bearing alloy onto a backing metal made of an iron-based alloy to form a composite material; (b) sintering the composite material to obtain a bimetal material so as to accomplish a primary sintering; (c) fabricating the bimetal material into a shape of the washer having the boss; and (d) simultaneously accomplishing a secondary sintering and carburizing of the washer having the boss. By virtue of simultaneously conducting the secondary sintering and the carburizing for the washer, the number of steps in producing method (particularly, during a heat treatment) is reduced thereby improving the productivity of the washer having the boss while reducing thermal energy required for the heat treatment.

REFERENCES:
patent: 1903785 (1933-04-01), Lillig
patent: 5332348 (1994-07-01), Lemelson
patent: 5390414 (1995-02-01), Lisowsky
patent: 5456406 (1995-10-01), Lemelson
patent: 5524719 (1996-06-01), Dennis

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