Title:
METHOD FOR MANUFACTURING FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2018/110073
Kind Code:
A1
Abstract:
This manufacturing method comprises: a forging step; a deburring step; and a pressing-down step. In the forging step, a finished forged material having burrs is formed using an upper forging die and a lower forging die. In this forging step, the whole or a part of an arm part (A) connected to first and third pin parts (P) is subjected to formation of an excess part on the upper-forging-die-side outer periphery of the arm part (A) near the pin parts (P), the excess part protruding from the outer periphery. In the deburring step, the burrs are removed from the finished forged material. In the pressing-down step, an upper die presses the excess part, causing the excess part to stretch out on a journal part (J) side. Thus, a forged crankshaft in which rigidity is ensured and weight reduction is facilitated can be manufactured with a simple configuration.
Inventors:
TAMURA KENJI (JP)
OKUBO JUNICHI (JP)
IMANISHI KENJI (JP)
YABUNO KUNIHIRO (JP)
HWANG SAM SOO (JP)
TAKAMOTO SHO (JP)
ISHII TADANAO (JP)
ISHIHARA KOICHIRO (JP)
OKUBO JUNICHI (JP)
IMANISHI KENJI (JP)
YABUNO KUNIHIRO (JP)
HWANG SAM SOO (JP)
TAKAMOTO SHO (JP)
ISHII TADANAO (JP)
ISHIHARA KOICHIRO (JP)
Application Number:
PCT/JP2017/037598
Publication Date:
June 21, 2018
Filing Date:
October 17, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B21K1/08; B21J5/02; F16C3/08
Domestic Patent References:
| WO2016092850A1 | 2016-06-16 | |||
| WO2016152933A1 | 2016-09-29 | |||
| WO2015075934A1 | 2015-05-28 |
Foreign References:
| JP2012007726A | 2012-01-12 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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