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:
Jul. 02, 2024
Filed:
Mar. 26, 2020
Osg Corporation, Toyokawa, JP;
Teruya Hisada, Toyokawa, JP;
OSG CORPORATION, Toyokawa, JP;
Abstract
Provided is a rolling die that increases the durability of a nitrided molded surface. The rolling die () includes a tool base material that is made of steel and has a molded surface () on which a plurality of working teeth () is formed. The tool base material includes a nitride layer () in which nitrogen is diffused. The nitride layer () is disposed to reach a position that is 20 to 70 μm in depth from the molded surface (). The molded surface () has a surface hardness of at least 1100 HV. The rate of depth change from the depth (D) of the nitride layer () at crests () of the working teeth () to the depth (D) of the nitride layer () at roots () of the working teeth () is not higher than 30%.