Title:
FORMING METHOD OF CRANK SHAFT AND FORMING PRESS FOR CRANK SHAFT
Document Type and Number:
Japanese Patent JP3737667
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a forming press for a crank shaft capable of torsion- forming a crank shaft for a plural cylinder engine at a time, using one of tor sion cylinders.
SOLUTION: In the forming press, in which plural twisting dies D are rotatably held with plural rotation guides, a push down arm 15, which is protruded in a radial direction outside from a retainer of respective torsion dies, is pushed down by a push rod elevating with one of torsion cylinders 20, a stock for a crank shaft is torsion-formed, the torsion die having a large torsion angle is arranged so that its push down arm 15a is arranged with aligning to a start position of a full stroke forming, the torsion die having a small torsion angle is arranged so that its push down arm 15b has a stroke shorter than the full stroke forming and is aligned to a start position of a half stoke starting in time lag, a stopper 41, which prevents the push down arm from corotation at the first half of the full stroke forming of the torsion die having a large torsion angle, is arranged to the torsion die having a small torsion angle.
Inventors:
Ozaki Yutaka
Masashi Tawatari
Masashi Tawatari
Application Number:
JP2000080548A
Publication Date:
January 18, 2006
Filing Date:
March 22, 2000
Export Citation:
Assignee:
Sumitomo Heavy Industries Ltd.
International Classes:
B21D11/16; F16C3/08; B21D37/00; F02B75/22; F02B75/18; (IPC1-7): B21D11/16; B21D37/00; F16C3/08
Domestic Patent References:
| JP49037696B1 |
Attorney, Agent or Firm:
Yasunobu Yamauchi
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