METHOD OF MANUFACTURING RARE-EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare-earth magnet capable of manufacturing a rare-earth magnet of high orientation by attaining sufficient plastic deformation while preventing a side face of a molded body to be plastically deformed from being cracked in hot plastic working. SOLUTION : A method of manufacturing a rare-earth magnet includes the steps of : manufacturing a molded body S; preparing a plastic working die formed from a dice D with a cavity Ca and a punch P which can be freely slid within the cavity Ca, the cavity Ca having a cross section of which the cross section dimension is larger than that of a cross section of the molded body S orthogonal with a direction of pressurization by the punch P, accommodating the molded body S in the cavity Ca and applying hot plastic working, thereby manufacturing an orientation magnet C. When a length of a short side of the cross section of the cavity Ca is defined as W1 and a length of a side of the cross section of the molded body S corresponding to the short side of the cavity Ca is defined as t1, t1/W1 is settled within the range of 0.55 to 0.85, a portion of the molded body S is restricted by the side face of the cavity Ca in the middle of hot plastic working, thereby suppressing deformation, and other portions are brought into a non-restricted state. COPYRIGHT : (C)2014, JPO&INPIT