Title:
METHOD FOR FORGING CRANKSHAFT, AND STRUCTURE OF TRIMMING DIE TO BE USED IN THE METHOD
Document Type and Number:
Japanese Patent JP2006247729
Kind Code:
A
Abstract:
To provide a method for forging a crankshaft, which method can achieve a necessary and sufficient correcting effect by correcting the shape of a counter weight in a trimming process without increasing the number of the forging processes.
In a crankshaft forging 5 forged by the processes including a step of first rough forging, a step of second rough forging, a step of finish forging, a step of trimming, a step of twisting, and a step of re-striking, and the shape correction of the counter weight 3 is performed in the step of trimming at the same time. A trimming die 8 is provided with correcting rollers 9, 10 for correcting the shape of the counter weight 3 by ironing work by the correcting rollers 9, 10.
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Inventors:
TAKAICHI KAZUHIRO
YOSHIDA YUJI
YOSHIDA YUJI
Application Number:
JP2005070250A
Publication Date:
September 21, 2006
Filing Date:
March 14, 2005
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
B21K1/08; B21D3/16; B21J5/02; B21J13/02
Attorney, Agent or Firm:
Tsuyoshi Hashimoto
Hiromichi Kobayashi
Tomioka Kiyoshi
Hiromichi Kobayashi
Tomioka Kiyoshi