Wenderoth, Lind & Ponack, L.L.P.
Butt joining method
A butt joining method is provided that is capable of joining together two members with high strength and high accuracy by utilizing plastic deformation. A bolt-shaped member having a female part at one end thereof and a piston rod having three annular grooves on a forward end part (male part) fittable to the female part are butted against each other with the female and male parts being fitted to each other. In this state, the side wall of the female part is radially pushed into the annular grooves on the piston rod by mechanical clinching technique. At this time, the pushing process is performed so that clinch portions formed by the pushing process are staggered between mutually adjacent ones of the annular grooves, thereby ensuring the desired joining strength and suppressing the elongation of the material, and thus preventing opening of the butt joint between the bolt-shaped member and the piston rod.
Hitachi, Ltd.
F B Y Y Y Y
F16B B21D Y10T Y10T Y10T Y10T
inventional inventional additional additional additional additional
Makoto
Nishimura