Toyota Jidosha Kabushiki Kaisha

Hitachi Metals, Ltd.

Proterial, Ltd.

Umetoku Co., Ltd

Daido Chemical Co., Ltd.

Katsuhiro Obata

Kenichi Inoue

Satoshi Murakami

Yoshihiko Kobayashi

Shuho Koseki

Fumiaki Honda

Tadashi Furuya

Tatsuya Shouji

Yoshikazu Suzuki

Toru Otomo

Takashi Ogisu

Kousuke Uda

Nobuhiro Ikeda

Toshifumi Miyamoto

Naoki Hayashi

Takahiro Makiyama

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.

Method for manufacturing forged article

Provided is an abrasion test apparatus for measuring an abrasion state of a workpiece, including: a workpiece holding mechanism holding the workpiece; a contact tool repeatedly making contact and non-contact with the workpiece; a rotating mechanism holding the contact tool to be freely rotatable; and a heating mechanism intermittently heating an end portion of the contact tool.

Abrasion test apparatus

Growing community of inventors

Tokyo, Japan

Katsuhiro Obata