Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1987-02-20
1988-05-03
Echols, P. W.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
123188AA, B21K 124
Patent
active
047410809
ABSTRACT:
A process for providing an engine valve (2) with varied microstructure grain size is provided. The process includes the steps of: providing a slug (4) of suitable metallic valve composition having a grain size of less than about A.S.T.M. 8; solution heat treating slug (4) to provide a larger grain size and to substantially dissolve carbonitride stringers if present; and forging the solution heat treated slug (4) in a manner that provides a substantially uniformly distributed A.S.T.M. grain size of about 1 to about 7 in a central region beneath the combustion face of head (14) of valve (2) while cold working a seat face (16) on head (14) and extruding the stem (10) of valve (2) such that its microstructure grain size is less than about A.S.T.M. 8.
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patent: 4657964 (1987-06-01), Allison
Allibone Michael A.
Caird Stephen B.
Dingell, III John D.
Gutierrez Antonio
Larson Jay M.
Chrow A. E.
Eaton Corporation
Echols P. W.
Rawlins Andrew E.
Rowe D. A.
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