METHOD FOR MANUFACTURING TORSION BEAM AND TORSION BEAM

Title:

METHOD FOR MANUFACTURING TORSION BEAM AND TORSION BEAM

Document Type and Number:

WIPO Patent Application WO/2010/114173

Kind Code:

A1

Abstract:

Provided is a means capable of improving the fatigue strength of an ear portion which is the fatigue high-risk portion of a torsion beam, causing minimal disadvantage in terms of productivity or costs. In particular, when shape-processing a tube (1) to be the torsion beam, a part of the tube (1) is crushed radially so as to have a nearly U-shaped cross section and thereafter bent with a bottom line (3) as the front side of bending, thereby imparting 2-6% pulling-side bending strain in the tube axis direction to the ear portion (2).

Inventors:

HASHIMOTO YUJI (JP)
TOYODA SHUNSUKE (JP)
NAKAGAWA KINYA (JP)
SUZUKI KOJI (JP)
KAWABATA YOSHIKAZU (JP)
SONOBE OSAMU (JP)
SATO AKIO (JP)

Application Number:

PCT/JP2010/056286

Publication Date:

October 07, 2010

Filing Date:

March 31, 2010

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
HASHIMOTO YUJI (JP)
TOYODA SHUNSUKE (JP)
NAKAGAWA KINYA (JP)
SUZUKI KOJI (JP)
KAWABATA YOSHIKAZU (JP)
SONOBE OSAMU (JP)
SATO AKIO (JP)

International Classes:

B21D53/88; B60G9/04

Foreign References:

JP2008169455A	2008-07-24
JP2007237784A	2007-09-20
JP2001321846A	2001-11-20
JP2009509774A	2009-03-12
JP2005289258A	2005-10-20
JP2002275538A	2002-09-25

Other References: