Toyota Jidosha Kabushiki Kaisha

Yuya Ikeda

Noritaka Miyamoto

Tetsuya Shoji

Daisuke Ichigozaki

Kazuaki Haga

Akira Manabe

Tomonori Inuzuka

Provided is a method for manufacturing a rare-earth magnet having good workability and capable of manufacturing a rare-earth magnet having low oxygen density. A method for manufacturing a rare-earth magnet includes: a first step of applying or spraying graphite-based lubricant GF on an inner face of a forming die M, and charging magnetic powder MF as a rare-earth magnet material in the forming die M, followed by cold forming, to form a cold-forming compacthaving a surface on which a graphite-based lubricant coatis formed; a second step of performing hot forming to the cold-forming compactto form a sintered bodyhaving a surface on which a graphite-based lubricant coatis formed; and a third step of, in order to give the sintered bodyanisotropy, performing hot deformation processing to the sintered bodyto form the rare-earth magnet

Method for manufacturing rare-earth magnets

A method for manufacturing a rare-earth magnet, through hot deformation processing, having a high degree of orientation at the entire area thereof and high remanence, without increasing processing cost including a step of press-forming powder as a rare-earth magnetic material to form a compact S; and a step of performing hot deformation processing to the compact S, thus manufacturing the rare-earth magnet C. The hot deformation processing includes two steps of extruding and upsetting. The extruding is to place a compact S in a die Da, and apply pressure to the compact S' in a heated state with an extrusion punch PD so as to reduce the thickness for extrusion to prepare the rare-earth magnet intermediary body S&#x2033; having a sheet form, and the upsetting is to apply pressure to the rare-earth magnet intermediary body S&#x2033; in the thickness direction to reduce the thickness, thus manufacturing the rare-earth magnet C.

Rare-earth magnet production method

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Toyota, Japan

Yuya Ikeda