Nissan Motor Company Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Jukogyo Kabushiki

Tomoyoshi Sato

Kazuo Morimoto

Nobutaka Maeda

Hidehiko Tsukamoto

Ryoichi Takahashi

Masataka Sato

A pair of dies are provided of which die faces are formed with depressions sequentially brought into engagement with a particular portion of a workpiece as the workpiece rolls between the die faces. By compressing the workpiece while driving the same to roll between the die faces, an excess metal of the workpiece is caused to flow into the depressions sequentially for thereby forming an asymmetrical part of the article.

Method of forming asymmetrical articles by rolling

A closed-die forging having an annular flat surface portion and a corner portion at an outer periphery of the annular flat surface portion is made by a method consisting of a rough forging process and a finish forging process. In the rough forging process, a rough forged product is shaped so as to have an annular flat surface portion smaller in outer diameter than the first mentioned annular flat surface portion and a conical surface portion at an outer periphery of the second mentioned annular flat surface portion. The conical surface portion is so shaped as to extend increasingly outwards as it extend in the same direction of movement of a punch of a rough forging die for performing a forming operation. In the finish forging process, the conical surface portion is pushed by a punch of a finish forging die in the same direction as the rough forging product is pushed by the first mentioned punch in the rough forging process and thereby formed together with the second mentioned annular flat surface into the first mentioned annular flat surface portion perpendicular to the direction of movement of the second mentioned punch.

Method of making a forging in closed-dies

Device for forming asymmetrical articles by rolling

Growing community of inventors

Fujisawa, Japan

Tomoyoshi Sato