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:
Oct. 02, 2018
Filed:
Nov. 20, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Kenji Tamura, Takatsuki, JP;
Junichi Okubo, Amagasaki, JP;
Koichiro Ishihara, Kyoto, JP;
Ken Yoshino, Nishinomiya, JP;
Kunihiro Yabuno, Matsubara, JP;
Hiroyuki Kurokawa, Nishinomiya, JP;
Tomohisa Yamashita, Suita, JP;
Sho Takamoto, Osaka, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion crushing step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion crushing step crushes the excess projecting portions of the crank arms by pressing the crankshaft using a pair of first dies, the crankshaft being obtained by removing the flash in the trimming step.