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Patent Searching and Data


Title:
METHOD FOR MANUFACTURING FORGED CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2019/155847
Kind Code:
A1
Abstract:
This method for manufacturing a forged crankshaft includes a first preliminary forming step, a second preliminary forming step, and at least one finishing forging step. The first preliminary forging step includes: a step in which a portion which is to be a journal section is pressed down by a pair of first dies (40) in a direction perpendicular to the axial direction of a billet (22) to form a flat section (23a); and a step in which, after the start of the pressing down by the first dies (40), a portion to be a pin section is made eccentric by a second die (50) so as to be eccentric in a direction perpendicular to the axial direction of the billet (22). In the second preliminary forming step, the portion of an initial rough forged portion (23), which is to be the pin section, and the flat section (23a) are pressed down while the width direction of the flat section (23a) is aligned with the press-down direction. The thickness of the portion of a final rough forged portion, which is to be a crank arm section, is same as a finish 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:
JP2019/001403
Publication Date:
August 15, 2019
Filing Date:
January 18, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
B21K1/08; B21J5/02; F16C3/08
Domestic Patent References:
WO2016147674A12016-09-22
WO2018056135A12018-03-29
WO2019039199A12019-02-28
Foreign References:
JPS5945051A1984-03-13
JP2001105087A2001-04-17
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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