METHOD FOR PRODUCING PRESS-MOLDED ARTICLE AND PRODUCTION LINE THEREOF

WIPO Patent Application WO/2017/175730

A1

A method for producing a press-molded article (1) includes a first pressing step and a second pressing step. In the first pressing step, a processing material (25) is formed into an intermediate molded article (11) by using a first metal mold (20). The intermediate molded article (11) includes step sections (14) in a top plate section (12), temporary vertical-wall sections (13) in which at least a portion of the shape of vertical-wall sections adjoining the top plate section (12) via ridgeline sections (15) is formed, and temporary flange sections (16) adjoining the temporary vertical-wall sections (13) via temporary ridgeline sections (17). In the second pressing step, the intermediate molded article (11) is formed into the press-molded article (1) by using a second metal mold (30). In the second pressing step, molding is performed such that the temporary ridgeline sections (17) are moved toward the temporary flange sections (16) in a state in which at least a portion of the top plate section (12) of the intermediate molded article (11) is retained. As a result, it is possible to produce a press-molded article in which cracks and creases are suppressed.

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NATORI JUNKI (JP)
NAKAZAWA YOSHIAKI (JP)
NISHIMURA RYUICHI (JP)
OGAWA KEIJI (JP)

PCT/JP2017/013982

October 12, 2017

April 03, 2017

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

B21D22/26; B21D22/20; B21D24/06

WO2014050973A1	2014-04-03
WO2011145679A1	2011-11-24

JP2013049077A	2013-03-14
JP2008018442A	2008-01-31
JP2014240078A	2014-12-25

See also references of EP 3441153A4

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