METHOD FOR MANUFACTURING FORGED CRANK SHAFT

WIPO Patent Application WO/2019/181366

A1

In the present invention, a first preliminary molding step comprises: a step for forming a flat section (23a) by reducing an area which is to serve as a journal section (J) using a first metal mold (40); and a step for making eccentric a first pin corresponding section and a third pin corresponding section using a second metal mold (50) after initiating the reduction using the first metal mold (40). An initial rough article is obtained from a billet (22) in the first preliminary molding step. In a second preliminary molding step, the flat section (23a) and an area which is to serve as a pin section (P) is reduced so that the thickness of an area which is to serve as an arm section (A) becomes greater than the thickness of a finished dimension. An intermediate rough article (24) is obtained from the initial rough article (23) in the second preliminary molding step. In a final preliminary molding step, the area which is to serve as the arm section (A) is reduced from the axial direction using a fourth metal mold (90) so as to reduce the thickness of the area which is to serve as the arm section (A) to the thickness of the finishing dimension while maintaining the eccentric amount of the first pin corresponding section and the third pin corresponding section.

OKUBO JUNICHI (JP)
TAMURA KENJI (JP)
YOSHIDA KUNIHIRO (JP)
HWANG SAM SOO (JP)
NAKANO RYUSUKE (JP)
HORI MASAO (JP)
OTA YUKIHIRO (JP)

PCT/JP2019/006843

September 26, 2019

February 22, 2019

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NIPPON STEEL CORP (JP)

B21K1/08; B21J5/02; F16C3/08

WO2016152933A1	2016-09-29
WO2015129208A1	2015-09-03
WO2014091730A1	2014-06-19
WO2018061765A1	2018-04-05

ASCEND IP LAW FIRM (JP)

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