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Title:
METHOD FOR MANUFACTURING FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2019/039199
Kind Code:
A1
Abstract:
This manufacturing method includes: a first preparatory shaping step of obtaining an initial rough forging from a billet; a second preparatory shaping step of obtaining a final rough forging from the initial rough forging; and a finish forging step of shaping the final rough forging to the finished dimensions of the forged crankshaft by means of at least one die forging. In the first preparatory shaping step, a plurality of flat portions are formed by depressing pin-corresponding portions and journal-corresponding portions from a direction perpendicular to the axial direction of the billet. The second preparatory shaping step includes: a step of using a pair of first dies to depress parts that are to become a plurality of journal portions, with the width direction of the flat portions arranged in the depressing direction; and a step of using a second die, after the depression using the first dies has begun, to decenter parts that are to become a plurality of pin portions, with the width direction of the flat portions arranged in the decentering direction. In the final rough forging, the thickness of parts that are to become a plurality of crank arm portions is the same as the finished dimension thickness.

Inventors:
OKUBO, Junichi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TAMURA, Kenji (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
YOSHIDA, Kunihiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
HWANG, Sam Soo (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
NAKANO, Ryusuke (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
HORI, Masao (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
OTA, Yukihiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/028443
Publication Date:
February 28, 2019
Filing Date:
July 30, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
B21K1/08; B21J5/02; F16C3/06
Domestic Patent References:
WO2016152933A12016-09-29
WO2016147674A12016-09-22
Foreign References:
JP2016107273A2016-06-20
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (5-17, Dojima 1-chome Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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