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:
Mar. 02, 2021
Filed:
Jun. 20, 2016
Ntn Corporation, Osaka, JP;
Enomoto Machine Co., Ltd., Kanagawa, JP;
Yoshiya Mano, Shizuoka, JP;
Shintaro Suzuki, Shizuoka, JP;
Shunichirou Tsuboi, Shizuoka, JP;
Akira Nagatake, Shizuoka, JP;
Renji Natsume, Shizuoka, JP;
Masazumi Kobayashi, Shizuoka, JP;
Tatsuro Sugiyama, Shizuoka, JP;
Yoshio Enomoto, Kanagawa, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A forging method for a shaft member includes preforming at least one of a plurality of enlarged diameter portions to obtain a semi-finished member, and forming a remainder of the enlarged diameter portions in the semi-finished member using a mold. The mold includes a punch, split dies, and a workpiece receiving member. The forming of the remainder of the enlarged diameter portions includes allowing the semi-finished member having the at least one of the enlarged diameter portions to be placed on the workpiece receiving member, cramping the semi-finished member in its radial direction by closing the split dies, and filling the semi-finished member into forming surfaces of the split dies by the pressure applied by the punch under the state in which the semi-finished member is cramped.