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Title:
PRODUCTION METHOD FOR PRESSED COMPONENTS, PRESS MOLDING DEVICE, AND METAL PLATE FOR PRESS MOLDING
Document Type and Number:
WIPO Patent Application WO/2019/167792
Kind Code:
A1
Abstract:
The present invention aims to reduce molding defects such as cracks, wrinkles, and reductions in dimensional accuracy, for pressed components having a curved shape that is convex towards a top plate side along the longitudinal direction. This production method has a first molding step (9A) in which a metal plate (10) is press-molded to an intermediate molded article (30) and a second molding step (9B) in which the target pressed component shape (1) is achieved, said intermediate molded article (30): being bent out of plane, in the side view, having as the bending position thereof a longitudinal direction center section of a region forming a curved section (1A); and having an overhanging section (30A) in a region that forms a top plate section (2) and a vertical wall section (3). The angle of curvature towards the outside of the plane is, in a region that is a flange section, less than an angle formed by the flange section (4) in a curved section (1A) in the pressed component shape (1). The overhanging section (30A) is set such that: the height of the overhang is greatest at the longitudinal direction center in a region that is the curved section (1A) in the side view; and the length of the longitudinal direction in a region forming the top plate section (2) matches or approaches the length in the longitudinal direction of the top plate section (2) in the pressed component shape (1).

Inventors:
MIYAKE HIROTO (JP)
SHINMIYA TOYOHISA (JP)
YAMASAKI YUJI (JP)
Application Number:
PCT/JP2019/006552
Publication Date:
September 06, 2019
Filing Date:
February 21, 2019
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D22/26; B21D19/08; B21D22/02; B21D22/20; B21D24/00
Domestic Patent References:
WO2018030240A12018-02-15
WO2016075937A12016-05-19
Foreign References:
JP2004174531A2004-06-24
JP2013027912A2013-02-07
JPS5733475B21982-07-17
JP5353329B22013-11-27
JP4709659B22011-06-22
JP2018034570A2018-03-08
Other References:
See also references of EP 3760331A4
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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