US 12,434,293 B2
Punch for riveting, device in which punch for riveting is disposed, and method for joining members
Yoshihito Araki, Yokohama (JP); Yuusuke Fukuoka, Yokohama (JP); and Nobuyuki Furugori, Yokohama (JP)
Assigned to NHK SPRING CO., LTD., Yokohama (JP)
Filed by NHK SPRING CO., LTD., Yokohama (JP)
Filed on Sep. 13, 2024, as Appl. No. 18/885,162.
Application 18/885,162 is a continuation of application No. PCT/JP2023/003203, filed on Feb. 1, 2023.
Claims priority of application No. 2022-041080 (JP), filed on Mar. 16, 2022.
Prior Publication US 2025/0001481 A1, Jan. 2, 2025
Int. Cl. B21J 15/02 (2006.01); B21J 15/12 (2006.01); B21J 15/26 (2006.01)
CPC B21J 15/02 (2013.01) [B21J 15/12 (2013.01); B21J 15/26 (2013.01); Y10T 29/49956 (2015.01)] 13 Claims
OG exemplary drawing
 
1. A punch for riveting and joining a first member having a convex part and a second member having a through hole fitting with the convex part by plastically deforming the convex part,
wherein the punch has a contact surface in contact with the convex part, and the contact surface is inclined at a range of 80° to 89° with respect to a center axis of the punch,
the contact surface has an elliptical shape in which an inclined direction is set to a major axis, and
a rotation axis of the punch coincides with the center axis of the punch.