Title:
PRESS FORMING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/121591
Kind Code:
A1
Abstract:
A press forming method according to the present invention is a method for forming a press formed product 1 having a top plate section 3, vertical wall sections 7, flange sections 9, and a protruding curved site 11 curved in a protruding manner and a recessed curved site 13 curved in a recessed manner in the height direction. The method includes: a preforming step for forming an intermediate formed product 31 having bead parts 37 formed in a vertical wall-corresponding surface section 33 corresponding to the vertical wall sections 7 on both sides in the longitudinal direction of each of the protruding curved site 11 and the recessed curved site 13; and a main forming step for forming the press formed product 1 by crushing the bead parts 37 of the intermediate formed product 31 and thereby inducing pseudo shearing deformation in the vertical wall-corresponding surface section 33. In the preforming step, the bead parts 37 are slanted such that an end section of each bead part 37 on the protruding curved site 11 side is spaced apart from a baseline 35 corresponding to a top-plate side ridge line section 5 between the top plate section 3 and the vertical wall section 7, and such that an end section of the bead part 37 on the opposite side is closer to the baseline 35.
Inventors:
SUMIKAWA SATOSHI (JP)
Application Number:
PCT/JP2019/030639
Publication Date:
June 18, 2020
Filing Date:
August 05, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D24/04; B21D22/20; B21D22/26
Domestic Patent References:
| WO2015098871A1 | 2015-07-02 | |||
| WO2015115348A1 | 2015-08-06 | |||
| WO2017006793A1 | 2017-01-12 | |||
| WO2015115348A1 | 2015-08-06 |
Foreign References:
| JPH08117879A | 1996-05-14 | |||
| JPH04105721A | 1992-04-07 | |||
| JPS5897430A | 1983-06-09 | |||
| JP5168429B2 | 2013-03-21 | |||
| JP5965159B2 | 2016-08-03 | |||
| JP2010115674A | 2010-05-27 |
Other References:
See also references of EP 3895824A4
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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