Title:
METHOD FOR FORMING DEFORMED CROSS SECTION AND FORMED ARTICLE OF QUADRILATERAL CROSS-SECTION EXCELLENT IN SPOT WELDABILITY
Document Type and Number:
Japanese Patent JP2010099738
Kind Code:
A
Abstract:
To solve a problem that it is difficult to obtain a formed article of deformed cross-section with high dimensional accuracy excellent in spot weldability in a conventional technology for forming deformed cross-section.
Crushing work is carried out on a tubular material 10 with a tensile strength (TS) of 590 MPa by a die of deformed cross-section having at least one flat part A1 on the surface thereof in a state that inner pressure is not loaded or in a state that an inner pressure of 50 MPa is loaded on it by liquid. Subsequently an inner pressure with a maximum inner pressure of Pmin [MPa] is loaded by the liquid to form the tubular material into a deformed cross-section shape, wherein Pmin=0.045TS.
Inventors:
SHINGU TOYOHISA
SUZUKI KOJI
SONOBE OSAMU
HASHIMOTO YUJI
IKEDA TOMOMASA
SATO AKIO
SUZUKI KOJI
SONOBE OSAMU
HASHIMOTO YUJI
IKEDA TOMOMASA
SATO AKIO
Application Number:
JP2009217528A
Publication Date:
May 06, 2010
Filing Date:
September 18, 2009
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
B21D26/033; B21D26/041; B21D35/00
Domestic Patent References:
| JP2008149343A | 2008-07-03 | |||
| JP2004255445A | 2004-09-16 | |||
| JP2002160024A | 2002-06-04 | |||
| JP2001096316A | 2001-04-10 | |||
| JP2000246361A | 2000-09-12 | |||
| JP2006061944A | 2006-03-09 | |||
| JP2004001022A | 2004-01-08 |
Attorney, Agent or Firm:
Eiichi Kobayashi