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Title:
METHOD FOR FORMING DEFORMED CROSS-SECTION AND FORMED ARTICLE OF QUADRILATERAL CROSS-SECTION EXHIBITING EXCELLENT SPOT WELDABILITY
Document Type and Number:
WIPO Patent Application WO/2010/035883
Kind Code:
A1
Abstract:
It is difficult to obtain a formed article of deformed cross-section which exhibits excellent spot-weldability and high dimensional precision by using a conventional technology for forming a deformed cross-section. In a state where no internal pressure is loaded to a tubular material (10) having a tensile strength (TS) of 590 MPa or above, or an internal pressure of 50 MPa or less is loaded to the tubular material (10) by liquid, the tublar material is subjected to tube-flattening by using dies (1, 1A) of deformed cross-section where at least one surface has a flat part, and then an internal pressure is loaded by the liquid so that the highest internal pressure is at least the following Pmin [MPa], whereby the tubular material is formed to have a deformed cross-section. Pmin=0.045×TS.

Inventors:
SHINMIYA TOYOHISA (JP)
SUZUKI KOJI (JP)
SONOBE OSAMU (JP)
HASHIMOTO YUJI (JP)
IKEDA RINSEI (JP)
SATO AKIO (JP)
Application Number:
PCT/JP2009/067123
Publication Date:
April 01, 2010
Filing Date:
September 24, 2009
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
SHINMIYA TOYOHISA (JP)
SUZUKI KOJI (JP)
SONOBE OSAMU (JP)
HASHIMOTO YUJI (JP)
IKEDA RINSEI (JP)
SATO AKIO (JP)
International Classes:
B21D26/02; B21D26/033; B21D26/041; B21D51/16
Foreign References:
JP2001096316A2001-04-10
JP2004255445A2004-09-16
JP2000246361A2000-09-12
JPH1147842A1999-02-23
JP2002220069A2002-08-06
JP2000246361A2000-09-12
Other References:
See also references of EP 2351623A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
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