Title:
METHOD FOR MANUFACTURING FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2016/152933
Kind Code:
A1
Abstract:
A method for manufacturing a forged crankshaft includes a first preparatory forming step, a second preparatory forming step, and a final preparatory forming step. In the first preparatory forming step, an article to be processed is reduced by a pair of first molds. Thus, while forming flat parts (23a) by reducing the cross-sectional area of locations forming pin parts and locations forming journal parts, a location (PA2) forming a pin part disposed at a second position (L2) is given eccentricity. In the second preparatory forming step, the initial preform (23) obtained in the first preparatory forming step is reduced by a second mold. Thus, a location (PA1) forming a pin part disposed at a first position (L1) is given eccentricity, and a location (PA3) forming a pin part disposed at a third position (L3) is given eccentricity on the opposite side from the location (PA1) forming the pin part disposed at the first position. As a result, the locations forming the pin parts can be given eccentricity and narrowed down in the preform, thereby improving material yield.
Inventors:
OKUBO JUNICHI (JP)
TAMURA KENJI (JP)
YOSHIDA KUNIHIRO (JP)
HWANG SAMSOO (JP)
NAKANO RYUSUKE (JP)
HORI MASAO (JP)
TAMURA KENJI (JP)
YOSHIDA KUNIHIRO (JP)
HWANG SAMSOO (JP)
NAKANO RYUSUKE (JP)
HORI MASAO (JP)
Application Number:
PCT/JP2016/059254
Publication Date:
September 29, 2016
Filing Date:
March 23, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21K1/08
Domestic Patent References:
WO2014091730A1 | 2014-06-19 |
Foreign References:
JPH0748786B2 | 1995-05-24 | |||
JPS55161541A | 1980-12-16 | |||
JP2001105087A | 2001-04-17 | |||
US2911705A | 1959-11-10 | |||
JPS62244545A | 1987-10-24 |
Other References:
See also references of EP 3275568A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
アセンド patent business corporation (JP)
アセンド patent business corporation (JP)
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