| 摘要 |
<p>A method of producing an anisotropic magnet from a composition essentially consisting of magnetic powder and a binder in the presence of an anisotropically oriented magnetic field used a mold (1) which comprises a mold body (2), a cavity (4) for molding the composition, a plurality of first magnet means (6a ... 6d) for providing magnetic fluxes constituting the magnetic field in the cavity (4), yokes (7a ... 7d) each provided between the cavity (4) and the first magnet means (6a ... 6d), and second magnet means (8a ... 8d) provided on both sides of the yokes (7a ... 7d) for preventing leakage of the magnetic fluxes. The first and second magnet means (6a ... 6d. 8a ... 8d) are made of permanent magnet such as rare earth cobalt magnet. The mold (1) may be provided at both ends with third magnet means for preventing axial leakage of the magnetic flux. Two or more molds may be combined in a single molding apparatus while sharing the first magnetic means. This mold (1) is suitable for the injection, extrusion or insert molding of bonded magnet rolls, motor rotors, etc.</p> |
