公开(公告)号：US20180065164A1

公开(公告)日：2018-03-08

申请号：US15551136

申请日：2016-02-03

Applicant: JFE STEEL CORPORATION

Inventor： Satoshi Sumikawa ,  Masaki Urabe ,  Jiro Hiramoto

IPC: B21D22/26 ,  B21D24/00 ,  B21D5/00 ,  B21D5/01

Abstract: A press forming method according to the present invention includes: a first forming step of forming the press formed part by using the first press forming tool having a line length in the cross-sectional direction of the joining portion contacting with a flange portion subjected to stretch flange deformation or a flange portion subjected to shrink flange deformation is a line length L1 in the cross-sectional direction that is shorter than a line length L2, where the line length L2 is a line length in a cross-sectional direction of the joining portion of the second press forming tool for making the product shape; and a second forming step of forming the press formed part in the product shape by crash forming by using the second press forming tool in which the line length in the cross-sectional direction of the joining portion is L2.