METHOD FOR MANUFACTURING FORGED CRANKSHAFT - NIPPON STEEL & SUMITOMO METAL CORP

Title:

METHOD FOR MANUFACTURING FORGED CRANKSHAFT

Document Type and Number:

WIPO Patent Application WO/2016/092850

Kind Code:

A1

Abstract:

A method for manufacturing a forged crankshaft includes a die forging step for obtaining forged material formed into the shape of a crankshaft by die forging and a reduction step for reducing forged material (30) by a pair of first molds (10). The forged material (30) has first excess parts (Aca, Ada) protruding from the outer periphery of side parts (Ac, Ad) in the vicinity of journal parts (J) on all or part of arm parts (A) having integrated weight parts (W). In the reduction step, the first excess parts (Aca, Ada) are reduced and deformed by the first molds (10), and the first excess parts (Aca, Ada) are pulled out to the pin part (P) side. Thus, a forged crankshaft that simultaneously achieves weight reduction and high rigidity can be obtained simply.

More Like This:

JP5113804	Twister
WO/2000/047362	CRANKSHAFT CONSTRUCTION

Inventors:

TAMURA KENJI (JP)
OKUBO JUNICHI (JP)
YOSHINO KEN (JP)
YABUNO KUNIHIRO (JP)
KUROKAWA HIROYUKI (JP)
YAMASHITA TOMOHISA (JP)
TAKAMOTO SHO (JP)
ISHIHARA KOICHIRO (JP)

Application Number:

PCT/JP2015/006155

Publication Date:

June 16, 2016

Filing Date:

December 10, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21K1/08; B21J5/02; F16C3/08

Domestic Patent References:

WO2006057593A1	2006-06-01
WO2015075934A1	2015-05-28
WO2015075940A1	2015-05-28

Foreign References:

JPS63180336A	1988-07-25
JP2010230027A	2010-10-14

Other References: