| 摘要 |
PURPOSE:To obtain a magnet easy to magnetize and excellent in axial orientation by a method wherein a melted and kneaded material of a binder filled with magnet powder and a coupling agent and a lubricant arranged around the periphery of the material are die-extruded and cured simultaneously when an anisotropic permanent magnet is manufactured by an extrusion in a magnetic field. CONSTITUTION:A melted and kneaded material 13 of a resin binder filled with magnet powder having uniaxial anisotropy is put in a cylinder 1 having a heater 2 coiled around the outside and a screw 4 incorporated in the inside, and is extruded by using an extrusion die 13. On the occasion, a lubricant cylinder 12 containing a lubricant 11 composed of silicon oil being provided on the upper peripheral part of the die 13, the lubricant 11 is made to stick on the circumference of the kneaded material 3 extruded, and then they are made to pass through a ferromagnetic die 5 whereon a magnetic field is impressed. Thereafter they are made to pass through a cooling die 7 surrounded by a cooling pipe 6, and thus an anisotropic magnet 8 coated with the lubricant 11 is obtained. By this method, a resin-bound type permanent magnet having a high magnetic characteristic is manufactured at low cost. |
