Title:
FORGED CRANK SHAFT AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2014/091738
Kind Code:
A1
Abstract:
This forged crank shaft (1) comprises a carbon steel containing S, and has a ratio (x/y) of a sulfide area ratio (x) in a position (X) corresponding to the parting plane of a finish-forging die to the sulfide area ratio (y) in a position (Y) corresponding to the base of the die-carved section of the finish-forging die of 1.5 or less, in a section corresponding to the surface after outer-circumferential mechanical processing of shaft parts including a journal part (J), a pin part (P), a front part (Fr), and a flange part (Fl). This forged crank shaft (1) is capable of preventing the occurrence of processed-surface cracking in the journal part (J) and the pin part (P) after the outer-circumferential mechanical processing.
Inventors:
TAHIRA HIROAKI (JP)
KIM KISUNG (JP)
OKUBO JUNICHI (JP)
KIM KISUNG (JP)
OKUBO JUNICHI (JP)
Application Number:
PCT/JP2013/007217
Publication Date:
June 19, 2014
Filing Date:
December 09, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21K1/08; B21J5/00; B21J5/02
Foreign References:
| JP2012161819A | 2012-08-30 | |||
| JP2010240710A | 2010-10-28 | |||
| JPH05349A | 1993-01-08 | |||
| JPH01320019A | 1989-12-26 | |||
| JP2003253384A | 2003-09-10 |
Other References:
See also references of EP 2933039A4
Attorney, Agent or Firm:
M. MORI PATENT FIRM (JP)
Patent business corporation Woods Michio patent firm (JP)
Patent business corporation Woods Michio patent firm (JP)
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