| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a rare earth magnet, in which no cracking is caused in a compact, and orientation disturbance by shear friction force acting from a punch or the like during lateral deformation of the compact is not caused, when manufacturing the rare earth magnet forming an orientation magnet by applying hot plastic processing to the compact.SOLUTION: This method is composed of a first step for manufacturing a compact S, and a second step for manufacturing a rare earth magnet C forming an orientation magnet by preparing a plastic processing die 10 comprising a dice 1 and a punch 2, housing the compact S in the cavity Ca thereof, and applying hot plastic processing to the compact, and the second step is composed of steps A, B. In the step A, the side face of the compact S forming a free end face laterally projects by pressing force by the punch 2 to be pressurized by a side face die 1c, the side face is pressed to a pre-stage before reaching a processing rate required for giving anisotropy to manufacture an orientation magnet precursor S', and in the step B, the side face of the orientation magnet precursor S' is returned to the free end face, and is pressed until the processing rate required for giving anisotropy is reached to manufacture an orientation magnet C. |
