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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2019/039193
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 part that is to become a second pin portion is decentered while a plurality of flat portions are formed. The second preparatory shaping step includes: a step of using a pair of second 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 third die, after the depression using the second dies has begun, to decenter a part that is to become a first pin portion, disposed in a first position, and a part that is to become a third pin portion, disposed in a third position, in mutually opposite directions, with the width direction of the flat portions arranged in the decentering direction.

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:
JP2018/028370
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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