METHOD FOR PRODUCING RARE-EARTH SINTERED MAGNET AND MOLDING DEVICE

WIPO Patent Application WO/2014/027641

A1

This method for producing a rare-earth sintered magnet 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 a through hole provided in a mold, and preparing a cavity 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 the cavity 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 the cavity via a slurry flow path connected to a slurry supply path that extends from an outer peripheral side surface of the mold to the cavity, wherein at least a portion of the slurry flow path in a section which passes the magnetic field is covered with an external magnetic field shielding material; 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 the cavity.

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

PCT/JP2013/071801

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

JPH0869908A	1996-03-12
JPS62251109A	1987-10-31
JPH0869908A	1996-03-12
JP2012179192A	2012-09-20

See also references of EP 2884506A4

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

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