PRESS FORMING METHOD

Japanese Patent JP2015100811

A

PROBLEM TO BE SOLVED: To obtain a shrink flange forming method which fundamentally solves a problem of a shrink flange crack without lowering a degree-of-freedom of a product shape, and further, does not cause complication of operation and does not lower productivity.SOLUTION: A press forming method for press-forming a formed component 1 including a top plate part 5 having a projected outer peripheral edge part 3 in which a part of the outer peripheral edge projects outward, and a vertical wall part 7 which is bent along the projected outer peripheral edge part 3 of the top plate part 5. The press forming method includes: a blank holding process for holding a part of a portion corresponding to the top plate part 5 in a blank material 9 by a blank holder 17; a first forming process for forming the vertical wall part 7; and a second forming process for forming the top plate part 5 flat. In the blank holding process, blank holding is performed with an interval from an R end of the projected outer peripheral edge part 3 in the top plate part 5 by a distance of not less than 10 times and not more than 100 times of a plate thickness of the blank material 9 before working, and in the second forming process, parts of the top plate part 5, on which blank holding has not been performed, are formed.

URABE MASAKI

JP2013243525A

June 04, 2015

November 26, 2013

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JFE STEEL CORP

B21D19/08

JP2007326112A	2007-12-20
JP2009241082A	2009-10-22
JPH04172128A	1992-06-19
JP2004154786A	2004-06-03
JP2006247675A	2006-09-21

WO2013094705A1

2013-06-27

Toshihiko Ishikawa

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