Title:
Forged crankshaft manufacturing method
Document Type and Number:
Japanese Patent JP6344485
Kind Code:
B2
Abstract:
A method for producing a forged crankshaft includes a die forging step of forming a forged blank having a crankshaft shape by die forging, and a pressing step of pressing the forged blank (30) by a first dies (10). The forged blank (30) includes first excess portions (Aca, Ada) attached to some or all of crank arms (A) each incorporating a counterweight (W), each of the first excess portions (Aca, Ada) protrudes from a side portion (Ac, Ad) of the crank arm, in a region near a journal (J). In the pressing step, the first excess portions (Aca, Ada) are deformed by the first dies (10) such that each of the first excess portions (Aca, Ada) bulges toward a pin (P). This facilitates the production of a forged crankshaft with a reduced weight and assured stiffness.
Inventors:
Kenji Tamura
Junichi Okubo
Ken Yoshino
Norihiro Yabuno
Nobuyuki Kurokawa
Tomohisa Yamashita
Takamoto recommendation
Hiroichiro Ishihara
Junichi Okubo
Ken Yoshino
Norihiro Yabuno
Nobuyuki Kurokawa
Tomohisa Yamashita
Takamoto recommendation
Hiroichiro Ishihara
Application Number:
JP2016563521A
Publication Date:
June 20, 2018
Filing Date:
December 10, 2015
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
B21K1/08; B21D3/16; B21J5/02; F16C3/08
Domestic Patent References:
| JP63180336A | ||||
| JP2010230027A | ||||
| JP2009197929A |
Foreign References:
| WO2006057593A1 | ||||
| WO2015075934A1 | ||||
| WO2015075940A1 |
Attorney, Agent or Firm:
Ascend Patent Business Corporation