Metal deforming – With cutting – By shearing tool-couple
Reexamination Certificate
2006-08-01
2006-08-01
Banks, Derris H. (Department: 3725)
Metal deforming
With cutting
By shearing tool-couple
C072S348000, C072S370140
Reexamination Certificate
active
07082805
ABSTRACT:
It is an object of the present invention to provide a method of manufacturing a cylindrical part with a thin-walled portion at a lower cost, and according to the manufacturing method of the present invention, a base metal formed with thin-walled portion adjacent to its closed end can be easily detached from working jigs. According to the method, a thin-walled portion is at first formed by the ironing process on a cylindrical wall adjacent to the closed end, so that an outer-side step portion is formed on an outer peripheral surface of the cylindrical wall. Then the closed end is punched out and the thin-walled portion is enlarged in a radial and outward direction to form an inner-side step portion on an inner peripheral surface of the cylindrical part.
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Ezaka Shinichi
Ito Tatsuya
Matsuura Tomohiro
Sugiyama Satoshi
Tako Nobuhisa
Banks Derris H.
Denso Corporation
Nihon Pakkin Co., Ltd.
Nixon & Vanderhye P.C.
Wolfe Debra M
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