Method for producing forged crankshaft

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United States of America Patent

PATENT NO 10799940
SERIAL NO

16332463

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Abstract

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A production method includes a preforming process, a forming process and a finish forging process. In the preforming process, an intermediate preform is formed from a billet. In the forming process, while each of a plurality of rough journals of the intermediate preform is held and pressed vertically by a pair of holding dies, rough pins are decentered in directions perpendicular to the pressing direction by the holding dies and an axial direction of the intermediate preform, and the intermediate preform is pressed in the axial direction of the intermediate preform. In the finish forging process, a final preform is placed such that the directions in which the rough pins are decentered are parallel to a horizontal direction, and the thus placed final preform is pressed vertically by a pair of pressing dies. The production method reduces the risk of occurrence of seams on a forged crankshaft.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hori, Masao Tokyo, JP 55 316
Hwang, Samsoo Tokyo, JP 3 6
Nakano, Ryusuke Tokyo, JP 9 9
Okubo, Junichi Tokyo, JP 29 34
Tamura, Kenji Tokyo, JP 134 1171
Yoshida, Kunihiro Tokyo, JP 18 21

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