Title:
PRODUCTION METHOD FOR PRESS-MOLDED MEMBER AND PRESS MOLDING DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/148618
Kind Code:
A1
Abstract:
A press molding step in which a press-molded article is obtained from a blank (300) from a steel sheet having a high tensile strength of at least 390 MPa, said article having a cross-sectional shape having at least a groove bottom section (101), a ridge section (102), and a vertical wall section(103). An outward flange (106) including a section (106a) following the ridge section (102) is formed in an end section in the longitudinal direction of the press-molded article. In the press molding step: an area (300a) is configured so as to be separated from a punch peak section (201b), said area (300a) being in at least an end section in the longitudinal direction out of a section molded in the groove bottom section (101) of the blank (300); the molding of a section molded in the ridge section (102) is started; and then the area (300a) is brought closer to the punch peak section (201b). As a result, the occurrence of stretched flange breakage and the occurrence of creases can be reduced or prevented, by comparatively slow molding from the start to part way through press molding, when molding the ridge section (102) and, in conjunction with same, molding the section (106a) in the outward flange (106).
Inventors:
NISHIMURA RYUICHI (JP)
NAKAZAWA YOSHIAKI (JP)
OTSUKA KENICHIRO (JP)
NAKAZAWA YOSHIAKI (JP)
OTSUKA KENICHIRO (JP)
Application Number:
PCT/JP2014/057846
Publication Date:
September 25, 2014
Filing Date:
March 20, 2014
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D22/26; B21D22/20; B21D24/00
Foreign References:
| JP2012051005A | 2012-03-15 | |||
| JP2010082660A | 2010-04-15 | |||
| JPH0523761A | 1993-02-02 | |||
| JP2007029966A | 2007-02-08 | |||
| US20050193795A1 | 2005-09-08 | |||
| JP4438468B2 | 2010-03-24 | |||
| JP2009255116A | 2009-11-05 | |||
| JP2012051005A | 2012-03-15 | |||
| JP2010082660A | 2010-04-15 | |||
| JP2007326112A | 2007-12-20 |
Other References:
See also references of EP 2977120A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
Takayoshi Kokubu (JP)
Takayoshi Kokubu (JP)
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