Honda Motor Co., Ltd.

Akitoshi Uchiumi

Nobuyuki Kakiya

Ikuo Kato

Tadahisa Akiyama

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

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Tochigi, Japan

Akitoshi Uchiumi