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:
Apr. 16, 2024
Filed:
May. 16, 2019
Proterial, Ltd., Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Daido Chemical Co., Ltd., Osaka, JP;
Umetoku Co., Ltd, Osaka, JP;
Tatsuya Shouji, Tokyo, JP;
Shuho Koseki, Tokyo, JP;
Kenichi Inoue, Tokyo, JP;
Katsuhiro Obata, Tokyo, JP;
Satoshi Murakami, Tokyo, JP;
Naoki Hayashi, Aichi, JP;
Yoshikazu Suzuki, Aichi, JP;
Toshifumi Miyamoto, Aichi, JP;
Toru Otomo, Aichi, JP;
Nobuhiro Ikeda, Nara, JP;
Kousuke Uda, Nara, JP;
Takashi Ogisu, Aichi, JP;
PROTERIAL, LTD., Tokyo, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi, JP;
DAIDO CHEMICAL CO., LTD., Osaka, JP;
UMETOKU CO., LTD, Osaka, JP;
Abstract
A method for manufacturing a forged article, capable of improving the durability of a die for forging is provided. The method, includes forging a steel material, by using a die, by spraying or applying a water-soluble polymer lubricant containing 0.01 to 0.98 mass % of a water-soluble sulfate onto a working surface of the die, the die being made of a raw material having a constituent composition of by mass %, of 0.4 to 0.7% of C, 1.0% or less of Si, 1.0% or less of Mn, 4.0 to 6.0% of Cr, 2.0 to 4.0% of (Mo+½W), 0.5 to 2.5% of (V+Nb), 0 to 1.0% of Ni, 0 to 5.0% of Co, 0.02% or less of N, and a remnant composed of Fe and impurities, and having hardness of 55 to 60 HRC, and the die including a nitrided layer or a nitrosulfidized layer on the working surface thereof.