Title:
COUPLING JOINT, AUTOMOBILE MEMBER, AND METHOD FOR MANUFACTURING COUPLING JOINT
Document Type and Number:
WIPO Patent Application WO/2021/033647
Kind Code:
A1
Abstract:
The present invention provides a coupling joint capable of suppressing generation of cracks near a friction pressure-welding surface, an automobile member, and a method for manufacturing the coupling joint. A coupling joint according to an aspect of the present invention is provided with: a first steel product that has a shaft part; a second steel product in which the amount of carbon at 0.2 mm or further inward from the surface is 0.25 mass% or more and into which the shaft part is pressure-inserted; and a friction pressure-welding surface at which the shaft part and the second steel product are joined, wherein the second steel product has a plastic deformation part which comes into contact with the friction pressure-welding surface, the plastic deformation part has a projection part that projects toward the outside of the second steel product, and the Vickers hardness of the base of the projection part measured at a surface that includes the center of the friction pressure-welding surface and that is vertical to the friction pressure-welding surface is 600 HV or less.
Inventors:
MATSUI SHO (JP)
KODAMA SHINJI (JP)
YOSHINAGA CHISATO (JP)
KODAMA SHINJI (JP)
YOSHINAGA CHISATO (JP)
Application Number:
PCT/JP2020/030906
Publication Date:
February 25, 2021
Filing Date:
August 14, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B23K20/12
Domestic Patent References:
| WO2017022184A1 | 2017-02-09 | |||
| WO2018011862A1 | 2018-01-18 | |||
| WO2017110531A1 | 2017-06-29 |
Foreign References:
| JPS6360081A | 1988-03-16 | |||
| JP2002294404A | 2002-10-09 | |||
| JP2006297398A | 2006-11-02 | |||
| JP2004141933A | 2004-05-20 |
Other References:
See also references of EP 4019180A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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