Title:
METHOD FOR SUPPRESSING FATIGUE CRACK PROGRESSION IN BENT SECTION OF METAL PLATE AND AUTOMOBILE COMPONENT
Document Type and Number:
WIPO Patent Application WO/2023/079800
Kind Code:
A1
Abstract:
A method for suppressing fatigue crack progression in a bent section of a metal plate according to the present invention suppresses progression of a fatigue crack in a bent section 3 formed by bending a metal plate 1. The method involves generating compressive residual stress by applying plastic strain at least within a range from a bend start point to a bend end point on the inside of the bend of the bent section 3 in a direction orthogonal to the valley line direction at an interval not smaller than the plate thickness of the metal plate 1 along the valley line direction of the bent section 3.
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Inventors:
YAMAGUCHI NAOKI (JP)
Application Number:
PCT/JP2022/028479
Publication Date:
May 11, 2023
Filing Date:
July 22, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B23P9/04; B21D5/01; B21D53/88
Foreign References:
| JPH08117879A | 1996-05-14 | |||
| JP2010029897A | 2010-02-12 | |||
| JP2004169065A | 2004-06-17 | |||
| JPH04182033A | 1992-06-29 | |||
| JPS5811284B2 | 1983-03-02 | |||
| JPH01259118A | 1989-10-16 | |||
| US20080223099A1 | 2008-09-18 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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