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Document Type and Number:
Japanese Patent JP6469856
Kind Code:
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 (20) and a second die (30) paired with each other, a retaining device (50), and a moving device (60). The first die (20) and the second die (30) bend or crush the excess portion. The retaining device (50) 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 (20) and the second die (30) apply force for reduction. The moving device (60) supports the retaining device (50) such that the retaining device is movable in the reducing direction.

Tomohisa Yamashita
Norihiro Yabuno
Ken Yoshino
Takamoto recommendation
Nobuyuki Kurokawa
Kenji Tamura
Junichi Okubo
Nakayama Kiyoshi
Toru Horiuchi
Application Number:
Publication Date:
February 13, 2019
Filing Date:
May 19, 2016
Export Citation:
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Nippon Steel & Sumitomo Metal Corporation
Nittetsu Sumikin Railway Technos Co., Ltd.
International Classes:
B21K1/08; B21D3/16; B21J5/02; F16C3/08
Domestic Patent References:
Attorney, Agent or Firm:
Ascend Patent Business Corporation