| 摘要 |
PURPOSE:To obtain radial by oriented magnet by making a coil magnetized magnetic field impression generate pulse radial repulsion magnetic field. CONSTITUTION:Member powder 9 is put in a motar 1 at the state that a lower punch 4 is inserted into the mortar 1 and a center bar 6 is projected, and an upper punch s removed to near-by the upper face of the mortar 1, then pulse current is conducted to a coil 8A, 8B for magnetized magnetic field impression. Magnetized magnetic field, which is stronger than at least lHc of powdery body, is impressed, then member powder 9 is magnetized previously. At this time, generation of large magnetic field is facilitated by means that one way magnetic field generation measure, which 8A, 8B are designated as hemimorphites by a hollow coil. After magnetization of the member powder 9 power, conduction to the coil 8A, 8B for magnetized magnetic field impression is stopped and the member powder 9 lowering an upper punch 3 is subjected to perform compress-forming at the state that a coil 7A, 7B for oriented magnetic field impression is conducted respectively, and oriented magnetic field in comparative weak radial direction less than lHc of the member is impressed. Thereby, a ring-state form, in which anisotrophic direction is changed to radial direction, is obtained. |
