| 简介 |
A production method for an anisotropic bonded magnet is provided which can improve the productivity for annular anisotropic bonded magnets and reduce the cost thereof. The production method for an anisotropic bonded magnet according to the present invention comprises : an alignment step that applies, from aligning magnetic pole bodies (13, 14) which include an even number of permanent magnets arranged uniformly around the outer periphery of an annular cavity (c) filled with magnetic raw material, aligning magnetic fields to cause rare-earth anisotropic magnet powder to be semi-radially aligned; a molding step that compressively molds the semi-radially aligned magnet raw material to obtain an annular compact; and a discharging step that discharges the compact from the annular cavity, and is characterized by further comprising a demagnetizing step that causes the aligning magnetic pole bodies to relatively move only in circumferential direction with respect to the compact after the molding step thereby to apply demagnetization magnetic fields to the compact, wherein the demagnetization magnetic fields are applied from the aligning magnetic pole bodies with opposite poles to those during the alignment step, and the demagnetization magnetic fields are in directions for cancelling the magnetization of the compact caused by the aligning magnetic fields. This allows considerable number of anisotropic bonded magnets to be produced in a short time. |
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