RARE-EARTH MAGNET PRODUCTION METHOD

摘要

Provided is a rare-earth-magnet production method with which, when producing rare-earth magnets by way of hot plastic working, rare earth magnets exhibiting high residual magnetization, and high orientation in all areas thereof can be produced without increasing working costs. The present invention comprises: a step in which a moulded body (S) is produced by pressure moulding a powder formed from a rare-earth-magnet material; and a step in which a rare-earth magnet (C) is produced by subjecting the moulded body (S) to hot plastic working. The hot plastic working comprises a two-stage step including extrusion working and upset working. In the extrusion working, the moulded body (S) is accommodated in a die (Da), and the moulded body (S') in a heated state is subjected to extrusion, pressurized using a punch (PD), and further subjected to extrusion while having the thickness thereof reduced, to produce a plate-like rare-earth-magnet intermediate body (S"). In the upset working, the rare-earth-magnet intermediate body (S") is pressurized in the thickness direction, and has the thickness thereof reduced, to produce the rare-earth magnet (C).