Title:
METHOD FOR PRODUCING DIE-FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2014/016875
Kind Code:
A1
Abstract:
This method for producing a die-forged crankshaft to be mounted in a reciprocating engine of two or more cylinders includes: an upsetting step in which a billet having a uniform cross-sectional area along its entire length is upset, thereby molding a buster having an expanded cross-sectional area in a section extending from the location corresponding to the crank arm portion at the head of the crankshaft to a location corresponding to the crank arm portion at the tail of the crankshaft; a die forging step in which the buster molded in the upsetting step is die forged to mold a forged material shaped into the form of a crankshaft and having flash attached; and a flash removing step for removing flash from the forged material molded in the die forging step. Thus, yield is improved and the cross-sectional size of the billets used can incorporate smaller sizes.
Inventors:
FUKUYASU TOMIHIKO (JP)
TANIMOTO NOBUTAKA (JP)
OKUBO JUNICHI (JP)
YOSHIDA KUNIHIRO (JP)
TANIMOTO NOBUTAKA (JP)
OKUBO JUNICHI (JP)
YOSHIDA KUNIHIRO (JP)
Application Number:
PCT/JP2012/004796
Publication Date:
January 30, 2014
Filing Date:
July 27, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
FUKUYASU TOMIHIKO (JP)
TANIMOTO NOBUTAKA (JP)
OKUBO JUNICHI (JP)
YOSHIDA KUNIHIRO (JP)
FUKUYASU TOMIHIKO (JP)
TANIMOTO NOBUTAKA (JP)
OKUBO JUNICHI (JP)
YOSHIDA KUNIHIRO (JP)
International Classes:
B21K1/08; F16C3/06
Foreign References:
| JPS6160236A | 1986-03-27 | |||
| JPH02104437A | 1990-04-17 | |||
| JP2000094087A | 2000-04-04 | |||
| JP2003326332A | 2003-11-18 | |||
| JPS58215237A | 1983-12-14 |
Attorney, Agent or Firm:
MORI, Michio et al. (JP)
Woods Michio (JP)
Woods Michio (JP)
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