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Title:
SHOCK ABSORBING MEMBER, METHOD OF MANUFACTURING SHOCK ABSORBING MEMBER, AND METHOD OF MANUFACTURING STEEL PLATE FOR COLD PLASTIC WORKING
Document Type and Number:
WIPO Patent Application WO/2020/262653
Kind Code:
A1
Abstract:
Provided are a shock absorbing member, a method of manufacturing a shock absorbing member, and a method of manufacturing a steel plate for cold plastic working, which enable an increase in shock absorption energy and a reduction in the thickness of a steel plate serving as a material. The shock absorbing member comprises a ridge part that, viewed from a longitudinal direction, is formed in a curved shape, and a wall part extending from the ridge part. In the wall part, a ratio σ5/τ5 between a tensile stress σ5 when elongation strain in a tensile test is 5% and a shear stress τ5 when shear strain in a shear test is 5√3% is less than or equal to 1.70, or a ratio σ10/τ10 between a tensile stress σ10 when elongation strain in a tensile test is 10% and a shear stress τ10 when shear strain in a shear test is 10√3% is less than or equal to 1.70. A Vickers hardness Hvc is greater than or equal to 250 in a central part of the wall part, as viewed from the longitudinal direction.

Inventors:
NAGANO MAI (JP)
YONEMURA SHIGERU (JP)
UENISHI AKIHIRO (JP)
Application Number:
PCT/JP2020/025355
Publication Date:
December 30, 2020
Filing Date:
June 26, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B62D21/00; B62D21/02; B62D21/15; B62D25/04; B62D25/06; B62D25/20; C21D8/00; C21D9/46; C22C38/00; C22C38/06; C22C38/58; F16B7/12; F16F7/00; F16F7/12
Domestic Patent References:
WO2018179388A12018-10-04
WO2020022481A12020-01-30
WO2018174082A12018-09-27
WO2014077294A12014-05-22
WO2020022481A12020-01-30
WO2020071523A12020-04-09
Foreign References:
JP2018090874A2018-06-14
JP2008280609A2008-11-20
JP2012167358A2012-09-06
JP2015058810A2015-03-30
JP2014024074A2014-02-06
JP2008144233A2008-06-26
JP2015058810A2015-03-30
JPH0118363B21989-04-05
Other References:
See also references of EP 3992060A4
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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