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Patent Searching and Data


Title:
METHOD FOR FORMING WASHER
Document Type and Number:
Japanese Patent JP2005161363
Kind Code:
A
Abstract:

To provide a method for forming a washer by which product cost can drastically be reduced by reducing material cost and producing cost.

The method for forming the washer comprises: a first process of obtaining a bar material 3 having a prescribed length by cutting off a coil material 1 having a prescribed diameter into a prescribed size; a second process of obtaining an intermediate body 5 having a flat annular part 5a in the circumferential part by pressing the bar material 3 at a multi-steps in the axial direction in the hot-state and expanding in the radiating direction; and a third process of punching out a portion except the annular part 5a in the intermediate body 5 into the round-shape having a prescribed diameter.


Inventors:
Maruta, Tomihiro
Yogi, Susumu
Application Number:
JP2003000403940
Publication Date:
June 23, 2005
Filing Date:
December 03, 2003
Export Citation:
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Assignee:
MINEBEA CO LTD
International Classes:
F16B43/00; B21J5/06; B21K1/76; B21K27/00; (IPC1-7): B21K1/76; B21J5/06; B21K27/00; F16B43/00