Method for manufacturing rare-earth magnets

Abstract

Provided is a method for manufacturing a rare-earth magnet capable of preventing the lubricant from flowing down during hot deformation processing, whereby friction force can be made as uniform as possible at the overall region of the sintered body, and so the rare-earth magnet manufactured can have less distribution of magnetic performance. A method for manufacturing a rare-earth magnet includes: a first step of sintering magnetic powder MF as a material of the rare-earth magnet to prepare a sintered body S; and a second step of placing the sintered body S in a cavity K of a forming die M made up of a die D and a lower punch P and/or an upper punch P sliding in the die D, and performing hot deformation processing of the sintered body S to give magnetic anisotropy to the sintered body to manufacture the rare-earth magnet C. In the second step, a lubrication sheetis disposed between a side face of each of the lower and the upper punches P, P facing the cavity K and the sintered body S, the lubrication sheet including a pair of graphite sheetsand glass-based lubricantsandwiched therebetween, and the hot deformation processing is performed while sandwiching the sintered body S between the upper and the lower lubrication sheets