METHOD FOR PRODUCING RARE-EARTH SINTERED MAGNET AND MOLDING DEVICE

WIPO Patent Application WO/2014/027638

A1

This method for producing rare-earth sintered magnets comprises: preparing a slurry including a dispersion medium and an alloy powder that includes a rare-earth element; arranging an upper punch and a lower punch in each of a plurality of through holes provided in a mold, and preparing a plurality of cavities each surrounded by the mold, the upper punch, and the lower punch, wherein at least one of the upper punch and the lower punch is movable and the upper punch and the lower punch can come close to and separate from one another and at least one of the upper punch and the lower punch has a discharge hole for discharging the dispersion medium of the slurry; applying a magnetic field inside each of the cavities with an electromagnet in a direction substantially parallel to the direction in which at least one of the upper punch and the lower punch is movable, and then supplying the slurry into each of the cavities via a plurality of slurry supply paths that extend, without branching, from an outer peripheral side surface of the mold to the respective cavities; and bringing the upper punch and the lower punch close to one another while applying the magnetic field and obtaining a molded body of the alloy powder inside each cavity.

TSUKADA TAKASHI (JP)
NANSAKA TAKUYA (JP)
KIKUCHI SATORU (JP)

PCT/JP2013/071797

February 20, 2014

August 12, 2013

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HITACHI METALS LTD (JP)

H01F41/02; B22F3/00; B22F3/02; C22C33/02; H01F1/055; H01F1/08; C22C38/00

WO2005096331A1

2005-10-13

JP2006253526A	2006-09-21
JP2007203577A	2007-08-16
JPH0869908A	1996-03-12
JP2012179163A	2012-09-20

See also references of EP 2884505A4

SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)

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