Title:
RARE-EARTH-MAGNET PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2014/065188
Kind Code:
A1
Abstract:
Provided is a rare-earth-magnet production method with which, when producing rare-earth magnets by way of hot plastic working, rare earth magnets exhibiting high residual magnetization, and high orientation in all areas thereof can be produced without increasing working costs. The present invention comprises: a step in which a moulded body (S) is produced by pressure moulding a powder formed from a rare-earth-magnet material; and a step in which a rare-earth magnet (C) is produced by subjecting the moulded body (S) to hot plastic working. The hot plastic working comprises a two-stage step including extrusion working and upset working. In the extrusion working, the moulded body (S) is accommodated in a die (Da), and the moulded body (S') in a heated state is subjected to extrusion, pressurized using a punch (PD), and further subjected to extrusion while having the thickness thereof reduced, to produce a plate-like rare-earth-magnet intermediate body (S"). In the upset working, the rare-earth-magnet intermediate body (S") is pressurized in the thickness direction, and has the thickness thereof reduced, to produce the rare-earth magnet (C).
Inventors:
ICHIGOZAKI DAISUKE (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
IKEDA YUYA (JP)
MANABE AKIRA (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
IKEDA YUYA (JP)
MANABE AKIRA (JP)
Application Number:
PCT/JP2013/078191
Publication Date:
May 01, 2014
Filing Date:
October 17, 2013
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
ICHIGOZAKI DAISUKE (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
IKEDA YUYA (JP)
MANABE AKIRA (JP)
ICHIGOZAKI DAISUKE (JP)
MIYAMOTO NORITAKA (JP)
SHOJI TETSUYA (JP)
IKEDA YUYA (JP)
MANABE AKIRA (JP)
International Classes:
H01F41/02; B22F3/17; B22F3/20; C22C28/00; H01F1/057; H01F1/08
Foreign References:
| JPH01248503A | 1989-10-04 | |||
| JPH05129128A | 1993-05-25 | |||
| JPH05166655A | 1993-07-02 | |||
| JPH02250920A | 1990-10-08 | |||
| JPH02250922A | 1990-10-08 | |||
| JPH02250919A | 1990-10-08 | |||
| JPH02250918A | 1990-10-08 | |||
| JPH0444301A | 1992-02-14 | |||
| JPH04134804A | 1992-05-08 | |||
| JP2008091867A | 2008-04-17 |
Other References:
YOICHI SAKAMOTO ET AL.: "Men Ihosei MnAlC Jishaku", NATIONAL TECHNICAL REPORT 0028-0291, vol. 28, no. 6, December 1982 (1982-12-01), pages 1171 - 1180, XP008176506
See also references of EP 2913831A4
See also references of EP 2913831A4
Attorney, Agent or Firm:
HIRAKI Yusuke et al. (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
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