METHOD FOR PRODUCING RARE EARTH SINTERED MAGNETS

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This method for producing rare earth sintered magnets is characterized by including : 1) a step in which a slurry is prepared, said slurry containing a dispersion medium, and an alloy powder containing a rare earth element, iron and boron, in a prescribed ratio; 2) a step in which a cavity is prepared, said cavity being surrounded by a mold, and an upper punch and a lower punch, at least one of which moves, enabling the punches to move toward and away from each other inside the mold, and at least one of which has a drain hole for draining the dispersion medium of the slurry; 3) a step in which a magnetic field of at least 1.5 T is applied to the inside of the cavity in the direction parallel to the direction in which the upper punch and/or lower punch is capable of moving, and the slurry is supplied at a flow rate of 20 to 600 cm3/second with the upper punch and the lower punch in a stationary state so as to fill the cavity with the slurry; 4) a step in which, with the magnetic field being applied as is, a molded body of the alloy powder is obtained by carrying out press molding in the magnetic field, which brings the upper punch and the lower punch close; and 5) a step in which the molded body is sintered.