The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2019
Filed:
Mar. 31, 2016
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Sho Takamoto, Osaka, JP;
Kenji Tamura, Takatsuki, JP;
Tomohisa Yamashita, Suita, JP;
Kunihiro Yabuno, Matsubara, JP;
Ken Yoshino, Guangdong, CN;
Hiroyuki Kurokawa, Nishinomiya, JP;
Junichi Okubo, Amagasaki, JP;
Koichiro Ishihara, Kyoto, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
The disclosed production method includes a rough forging step of performing die forging to obtain a rough forged blank with flash having a crankshaft shape, and a finish forging step of applying die forging by use of a first pair of dies to the rough forged blank to obtain a finish forged blank with flash. In the rough forged blank, at least one of the rough crank arms have, in a region near an adjacent rough pin, a first excess portion protruding from an outer periphery of a side portion of the rough crank arm. During the die forging in the finish forging step, the first excess portion is deformed by the first pair of dies to bulge toward an adjacent rough journal.