Title:
PRESS-FORMING METHOD
Document Type and Number:
WIPO Patent Application WO/2014/109245
Kind Code:
A1
Abstract:
A press-forming device (1a) successively carries out: a first step in which a plate-shaped workpiece is pushed into the inside of a die (14) by a punch (11) for formation, and formed into a cup-shaped workpiece (B); a second step in which a pressure member (12) is brought into contact with the end part of a cup vertical wall section (B1), and the cup-shaped workpiece (B) is moved relative to the location at which a space (S2) is formed between a cup bottom section (B2) and the punch (11) for formation; and a third step in which a counter punch (13) is brought close to the punch (11) for formation, and thus the cup bottom section (B2) is pushed into the side of the punch (11) for formation and compressed by the punch (11) for formation and the counter punch (13), causing the material of the cup vertical wall section (B1) to flow into a cup shoulder section (B3), thickening the cup shoulder section (B3).
Inventors:
YAMAGATA MITSUHARU (JP)
YAMAMOTO SHUJI (JP)
WADA YASUHIRO (JP)
YAMAMOTO SHUJI (JP)
WADA YASUHIRO (JP)
Application Number:
PCT/JP2013/084881
Publication Date:
July 17, 2014
Filing Date:
December 26, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21D22/26; B21D24/04
Foreign References:
| JP2001047175A | 2001-02-20 | |||
| JP2001314921A | 2001-11-13 | |||
| JPS61269938A | 1986-11-29 | |||
| JPH10329503A | 1998-12-15 |
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
Takayoshi Kokubu (JP)
Takayoshi Kokubu (JP)
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