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. 01, 2017
Filed:
Mar. 18, 2014
Hitachi Metals, Ltd., Tokyo, JP;
Tetsuya Yagami, Yokohama, JP;
Toshiya Teramae, Yokohama, JP;
Etsuo Fujita, Yasugi, JP;
Shinya Nagao, Yasugi, JP;
Remi Mukouse, Yokohama, JP;
Naoyuki Iwasa, Yasugi, JP;
Tsuyoshi Fukui, Yasugi, JP;
Chuya Aoki, Yasugi, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
A manufacturing method provides a high-quality material for ring rolling. The manufacturing method of the material for ring rolling includes a step of heating a disk-shaped material for hot forging to a hot working temperature, a step of arranging the material for hot forging onto a lower die having a convex portion with a truncated conical shape, a step of forming a thin portion by pressing a center portion of the material for hot forging by using an upper die having a convex portion with a truncated conical shape, and a step of manufacturing a material for ring rolling by removing the thin portion wherein a center of gravity on a half section of the material for ring rolling is located so as to be closer to an outer peripheral surface of the half section than a center of the half section in a thickness direction of the half section.