METHOD FOR PRODUCING RIVET JOINT, RIVET JOINT, AND AUTOMOBILE PART

Title:

METHOD FOR PRODUCING RIVET JOINT, RIVET JOINT, AND AUTOMOBILE PART

Document Type and Number:

WIPO Patent Application WO/2023/047840

Kind Code:

A1

Abstract:

A method for producing a rivet joint according to one embodiment of the present invention comprises passing the shaft part of a steel rivet having the shaft part and a head part through a through-hole in a plurality of overlapped sheet materials, sandwiching the rivet between a pair of electrodes in the axial direction of the rivet, applying pressure and a current to the rivet by means of the pair of electrodes, thereby forming a modified portion at the distal end of the shaft part, and cooling the rivet, wherein the Vickers hardness HB of the head part of the cooled rivet satisfies the equation 130≤HB≤330, and the Vickers hardness HA of the modified portion of the cooled rivet, the thickness TA of the modified portion, the Vickers hardness HJ of an area in the center of the shaft part in the axial direction and in the center in the radial direction, the diameter DJ of the shaft part, the Vickers hardness HB of the head part, and the thickness TB of the head part satisfy the equations HJ×DJ≥4.7×HB×TB and HA×TA≥1.3×HB×TB.

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Inventors:

FUJIMOTO HIROKI (JP)
MANABE TOSHIYUKI (JP)
ONO ATSUSHI (JP)
AKIOKA KOJI (JP)
IMAMURA TAKASHI (JP)

Application Number:

PCT/JP2022/030925

Publication Date:

March 30, 2023

Filing Date:

August 16, 2022

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

B21J15/00; B23K11/14; F16B5/04; F16B5/08

Domestic Patent References:

WO2006507128A1

Foreign References:

JPH03216282A	1991-09-24
JPS4914968A	1974-02-08
JPH05285567A	1993-11-02
JPS6192438U	1986-06-14
JP2006507128A	2006-03-02
JP2021156655A	2021-10-07
JPS5527456A	1980-02-27
JPS5378486A	1978-07-11
JPS61165247A	1986-07-25
JPH10205510A	1998-08-04
JPH03216282A	1991-09-24
JP2000202563A	2000-07-25

Attorney, Agent or Firm:

MATSUNUMA Yasushi et al. (JP)

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