PRESS MOLDING METHOD

WIPO Patent Application WO/2014/199730

A1

This press molding method is characterized by having: a metal plate disposing step for disposing a metal plate (17) in a manner such that the portion (17a) contacting the end of the narrow end (2a) of the metal plate (17) does not impinge on a blank holder (9); a metal plate sandwiching step for sandwiching the disposed metal plate (17); a molding step for molding the metal plate (17) in the sandwiched state by means of drawing; and a pad restraining step after the metal plate sandwiching step for restraining a position including an L-shaped bend (2b) at a site corresponding to the top plate (2) of the metal plate (17) by means of a pad (11) and a punch (6) partway through the molding process. The press molding method is further characterized in that the pad restraining step is started where the punch in the molding step is at a position that is 0-50% of the molding depth from the position of the start of contact to the metal plate (17) to the bottom dead center position, and the blank holder pressure is at least 0.7 MPa and the pad pressure is at least 3 MPa.

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SHIOZAKI TSUYOSHI (JP)
KISHIGAMI YASUHIRO (JP)

PCT/JP2014/061581

December 18, 2014

April 24, 2014

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JFE STEEL CORP (JP)

B21D22/26; B21D24/04

JP2010036217A	2010-02-18
JP2002282950A	2002-10-02
EP2524740A1	2012-11-21
JP2012232315A	2012-11-29
JP2004344925A	2004-12-09

SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)

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