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Title:
FORGING METHOD
Document Type and Number:
Japanese Patent JP2010110810
Kind Code:
A
Abstract:

To provide a forging method wherein enhancement in productivity and cost reduction are attained.

The forging method includes: a primary forming step where a forging raw material W is subjected to a primary formation by die forming to obtain a primary formed product W1 having a wall thickness reduction part having a small cross sectional area with respect to the forging raw material W; and a secondary forming step where the primary formed product W1 is subjected a secondary formation by the die forming to obtain a forged product W2. In the primary forming step, the closed forging wherein any projected burr is not formed is executed to a part corresponding to at least the wall thickness reduction part of the forging raw material W.


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Inventors:
YOSHIDA HIDETO
KAWAMATA YASUJI
Application Number:
JP2008288006A
Publication Date:
May 20, 2010
Filing Date:
November 10, 2008
Export Citation:
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Assignee:
SHOWA DENKO KK
International Classes:
B21K1/74; B21J5/02; B21J13/02
Domestic Patent References:
JP2005111558A2005-04-28
JPH05177290A1993-07-20
JPH0459146A1992-02-26
JPH05177290A1993-07-20
JP2008207252A2008-09-11
JP2005111558A2005-04-28
JPH10180394A1998-07-07
JPH02179336A1990-07-12
JP2004034115A2004-02-05
JP2004167584A2004-06-17
JP2007130645A2007-05-31
Attorney, Agent or Firm:
Yoshihito Shimizu
Hisayoshi Shimizu
Ken Takada



 
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