METHOD FOR IMPROVING DELAYED FRACTURE CHARACTERISTICS OF STEEL SHEET, METHOD FOR PRODUCING BLANK, METHOD FOR PRODUCING PRESS-FORMED ARTICLE, AND PRESS-FORMED ARTICLE

WIPO Patent Application WO/2023/037961

A1

In order to suppress, by a simple method, delayed fracture from a sheared-end face after forming, the present invention provides a method for improving the delayed fracture characteristics of a metal sheet comprising a high-strength steel sheet. The present invention is a method for improving delayed fracture characteristics of a metal sheet (10) that comprises a high-strength steel sheet and has a sheared-end face (10A) in at least a portion of a sheet end section. Plastic deformation is imparted to at least a portion of the sheared-end face (10A) of the metal sheet (10).

MATSUKI YUICHI (JP)
SHINMIYA TOYOHISA (JP)
NAKAGAWA KINYA (JP)
YAMASAKI YUJI (JP)

PCT/JP2022/032988

March 16, 2023

September 01, 2022

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JFE STEEL CORP (JP)

B21D1/06

JP2006224151A	2006-08-31
JPS5855128A	1983-04-01
JP2017125228A	2017-07-20
JPH09122756A	1997-05-13
JP2019089076A	2019-06-13
JP2021146245A	2021-09-27

YUZO TAKAHASHI ET AL.: "Improvement in Stretch Flange Ability of High-Tensile-Strength Steel Sheets by Piercing under Tension Using Humped Bottom Punch", JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 54-627, 2013, pages 343 - 347
TAKEO NAKAGAWAKIYOTA YOSHIDA: "Scraping method - A new method for recovery of stretchablity of sheared edge", JOURNAL OF THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 10-104, 1969, pages 665 - 671

TANAKA Hidetetsu et al. (JP)

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