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:
Aug. 04, 2020
Filed:
Aug. 23, 2016
Ntn Corporation, Osaka-shi, Osaka, JP;
Kohei Mizuta, Kuwana, JP;
Chikara Ohki, Kuwana, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A first step of setting a steel material heated to a temperature not lower than an Atransformation point on a forming table and a second step of punching a ring-form member from the steel material and thereafter forming and quenching the ring-form member on the forming table are included. A press die is constructed to be dividable into an inner cylinder and an outer cylinder. In the second step, the ring-form member is punched from a coil material by pressing a tip end portion of the inner cylinder and a tip end portion of the outer cylinder against the coil material. The punched ring-form member is formed and quenched by further pressing a tip end of the inner cylinder against the ring-form member while the ring-form member is held between the outer cylinder and a forming die.