Nippon Steel Corporation

Toru Horiuchi

Kenji Tamura

Hiroyuki Kurokawa

Junichi Okubo

Kunihiro Yabuno

Ken Yoshino

Tomohisa Yamashita

Sho Takamoto

Kiyoshi Nakayama

A forged crankshaft manufacturing apparatus processes a forged blank with no flash. The forged blank includes at least one rough crank arm having an excess portion protruding from an outer periphery of a side portion thereof. The manufacturing apparatus includes a first die and a second die paired with each other, a retaining device, and a moving device. The first die and the second die bend or crash the excess portion. The retaining device retains at least one of the rough journals or at least one of the rough pins such that a rough pin decentering direction is perpendicular to a reducing direction in which the first die and the second die apply force for reduction. The moving device supports the retaining device such that the retaining device is movable in the reducing direction.

Apparatus and method for manufacturing forged crankshaft

Growing community of inventors

Osaka, Japan

Toru Horiuchi