Honda Motor Co., Ltd.

Tadahisa Akiyama

Nobuyuki Kakiya

Ikuo Kato

Akitoshi Uchiumi

Tsunenari Futagi

Yuji Matsumoto

Haruo Machida

Toshimasa Koshimizu

Shinichi Ohnaka

A workpiece having a first constant diameter portion, a tapered reduced-diameter portion, a concave portion, a tapered increased-diameter portion, and a second constant diameter portion is formed by machining the tapered reduced-diameter portion, and then machining the tapered increased-diameter portion and the concave portion.

Spinning method

A method of forming a hollow curled portion on a hollow body, the curled portion being oriented from one end to the other end of the hollow body. The method includes a bending step of curving an end of the hollow body toward another end of the hollow body, thereby forming a curled portion, an ironing step of ironing the curled portion with a die, and a recurving step of stopping the die from ironing the curled portion and allowing the curled portion to recurve under its own resiliency in a direction opposite to the direction in which the end of the hollow body has been curved. The ironing step and the recurving step are repeated.

Method of forming curled portion

Growing community of inventors

Tochigi, Japan

Tadahisa Akiyama