MOLDING DIE FOR ANISOTROPIC BONDED MAGNET AND PRODUCTION METHOD USING THE SAME

• Main Authors: TSUBOI YOSHIHIRO, MATSUDA HIDEKI
• Format: Patent
• Language: English; Japanese
• Published: 16.08.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; WORKING METALLIC POWDER

PROBLEM TO BE SOLVED: To provide a molding die capable of adjusting a surface magnetic flux density to a desired waveform with a highly-oriented magnetic field with respect to an anisotropic bonded magnet.SOLUTION: The molding die is provided with a mold frame member 2 for defining a hollow portion 3 which can be filled with a composition Cm containing a material of an anisotropic bonded magnet to be formed, and an orienting magnet 4 for magnetically orienting the magnet material of the composition Cm in the hollow portion 3. The orienting magnet 4 is arranged as a plurality of permanent magnets 5 which give a magnetic field facing the center position of a corresponding magnetic pole Mp so as to configure a desired surface magnetic flux density waveform to each magnetic pole Mp of the anisotropic bonded magnet. The molding die is also provided with a main permanent magnet 5a for applying a magnetic field to a region including the center position, and a pair of sub permanent magnets 5b and 5c arranged so as to sandwich the main permanent magnet 5a and to exert a magnetic field in a direction inclined at a predetermined angle with respect to the magnetic field direction of the main permanent magnet 5a. The molding die is further provided with an oriented magnetic body 6 made of a ferromagnetic material which is disposed between the magnetic pole Mp and the main permanent magnet 5a.SELECTED DRAWING: Figure 1 【課題】異方性ボンド磁石に対して強い配向磁場で表面磁束密度波形を所望の形状に調整可能な成形用金型を提供する。【解決手段】成形すべき異方性ボンド磁石の材料を含む組成物Ｃｍが充填可能な空洞部３を区画する金型枠材２と、空洞部３内の組成物Ｃｍの磁石材料を磁気的に配向させる配向用磁石４と、を備え、配向用磁石４は、異方性ボンド磁石の各磁極Ｍｐに所望の表面磁束密度波形形成用の磁場を与える複数の永久磁石５として、対応する磁極Ｍｐの中心位置に対向して配置され、当該中心位置を含む領域に対して磁場を作用させる主永久磁石５ａと、主永久磁石５ａを挟むように配置されて主永久磁石５ａの磁場方向に対して予め決められた角度傾斜した方向の磁場を作用させる対構成の副永久磁石５ｂ，５ｃとを含み、更に、磁極Ｍｐと主永久磁石５ａとの間には強磁性材からなる配向磁性体６を配置する。【選択図】 図１