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. 20, 1998
Filed:
Sep. 04, 1996
Noritaka Miyamoto, Toyota, JP;
Masazumi Onishi, Toyota, JP;
Yasuyuki Fujiwara, Aichi-ken, JP;
Toshiaki Tanaka, Nagoya, JP;
Masatoshi Sawamura, Nagoya, JP;
Atsushi Danno, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
According to the present invention, in a heating step, an outer circumferential portion of a workpiece having a disk shape is heated to high temperatures. In a hot rough-rolling step, the outer circumferential portion of the heated workpiece is formed by use of a roller die to generate a rolled-gear having teeth. In a warm finish-rolling step, the teeth of the rolled-gear are finish-rolled by use of the finishing roller die. The starting temperature T.sub.1 of the hot rough-rolling step is set in the range of from 850.degree. through 1100.degree. C., the terminating temperature of the hot rough-rolling step T.sub.2 is set in the range of from 500.degree. through 700.degree. C. The starting temperature T.sub.3 of the warm finish-rolling step is set in the range of from 400.degree. through 700.degree. C., and the terminating temperature of the warm finish-rolling step T.sub.4 is set in the range of from 200.degree. through 650.degree. C.