Title:
METHOD FOR MANUFACTURING RARE-EARTH MAGNET
Document Type and Number:
WIPO Patent Application WO/2014/080852
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a rare-earth magnet, which is an orientation magnet, by subjecting a compact to hot plastic working, in which cracks do not form in the compact and there is no orientation disruption due to the shear friction force applied by a punch or the like during lateral deformation of the compact. The method comprises: a first step for manufacturing a compact (S); and a second step for manufacturing a rare-earth magnet (C), which is an orientation magnet, by preparing a plastic working mold (10) comprising a die (1) and a punch (2), placing the compact (S) in a cavity (Ca) of the mold (10), and subjecting the compact (S) to hot plastic working. The second step comprises steps (A) and (B). Step (A) comprises: causing a side surface of the compact (S), which is a free end-face, to project laterally due to the pressure from the punch (2); applying pressure to the side surface from a side-surface mold (1c); and continuing the application of pressure up to a prior stage where the working rate required to impart anisotropic properties is reached, to manufacture an orientation magnet precursor (S'). Step (B) comprises returning the side surface of the orientation magnet precursor (S') to the free end-face and continuing the application of pressure until the working rate required to impart anisotropic properties is reached, to manufacture the orientation magnet (C).
Inventors:
KOBUCHI DAI (JP)
NISHIGAYA SHINYA (JP)
YOKOTA YUSUKE (JP)
KANO AKIRA (JP)
NISHIGAYA SHINYA (JP)
YOKOTA YUSUKE (JP)
KANO AKIRA (JP)
Application Number:
PCT/JP2013/080974
Publication Date:
May 30, 2014
Filing Date:
November 18, 2013
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
KOBUCHI DAI (JP)
NISHIGAYA SHINYA (JP)
YOKOTA YUSUKE (JP)
KANO AKIRA (JP)
KOBUCHI DAI (JP)
NISHIGAYA SHINYA (JP)
YOKOTA YUSUKE (JP)
KANO AKIRA (JP)
International Classes:
H01F41/02; B22F3/00; B22F3/24; H01F1/055; H01F1/08
Foreign References:
| JP2008505500A | 2008-02-21 | |||
| JPH046811A | 1992-01-10 | |||
| JPH02238611A | 1990-09-20 | |||
| JPH10284314A | 1998-10-23 | |||
| JP2012044021A | 2012-03-01 | |||
| JP2003086413A | 2003-03-20 | |||
| JP2013098486A | 2013-05-20 | |||
| JP2013098485A | 2013-05-20 |
Attorney, Agent or Firm:
HIRAKI Yusuke et al. (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
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