Invention Grant
- Patent Title: Method for producing rare-earth magnet
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Application No.: US15841681Application Date: 2017-12-14
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Publication No.: US10546688B2Publication Date: 2020-01-28
- Inventor: Daisuke Ichigozaki , Takeshi Yamamoto
- Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Applicant Address: JP Toyota-shi, Aichi-ken
- Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Current Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
- Current Assignee Address: JP Toyota-shi, Aichi-ken
- Agency: Sughrue Mion, PLLC
- Priority: JP2016-253697 20161227
- Main IPC: H01F41/02
- IPC: H01F41/02 ; B22F3/16

Abstract:
Provided is a method for producing a rare-earth magnet that can resolve a problem of deterioration of the residual magnetization and coercive force of the rare-earth magnet due to spring-back in producing the rare-earth magnet through performing hot deformation processing of upsetting on a sintered body. The method includes a first step of producing the sintered body through press-forming of magnetic powder for a rare-earth magnet, and a second step of producing a rare-earth magnet precursor through hot deformation processing of upsetting in which the sintered body is placed within a plastic processing mold and is pressurized in a predetermined direction so as to impart magnetic anisotropy to the sintered body, and performing cooling of the rare-earth magnet precursor while a predetermined pressure is kept being applied thereto in the predetermined direction, so that the rare-earth magnet is produced.
Public/Granted literature
- US20180182542A1 METHOD FOR PRODUCING RARE-EARTH MAGNET Public/Granted day:2018-06-28
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