Honda Motor Co., Ltd.

Hidetaka Hiruma

Takayuki Ohnuma

Tsutomu Ando

Takashi Kobayashi

Ryotaro Takada

There is provided a method by which a member having an undercut in the inner peripheral portion thereof can be formed readily. To form a material () formed with a recess () and the undercut () by using a swaging device, while the material () is first gripped by a clamper (), and a mandrel () is inserted into the recess () of the material (). The mandrel () used has an outside diameter equal to the inside diameter of a blind hole of an aimed product (fuel injection nozzle). Then, the material () is pushed in by the mandrel () to a position at which the material () abuts on a stopper (), and the outside surface of the material () is struck by swaging dies () to perform a swaging operation. This swaging operation reduces the inside diameter of the recess () to the outside diameter of the mandrel (), with the undercut () left.

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Sayama, Japan

Hidetaka Hiruma