| 摘要 |
PURPOSE:To enable the rare earth cobalt base magnet, etc., to be magnetized even by any conventional magnetizer of relatively small output by a method wherein a magnetic material, after preheating process at specific temperature, is magnetized by the magnetizer and then restored to the room temperature. CONSTITUTION:As for the magnetic material, the material having the higher coercive force than that of ferrite magnet especially rare earth cobalt base magnetic material, neodymium ferromagnetic material, etc., are applicable. The magnetic material in specific size and shape is, after preheating process, heated in a magnetizer from 50 deg.C up to the temperature not exceeding the Curie point to be magnetized by the magnetism generated by a magnetizing coil and then restored to the room temperature. Through these procedures, the coercive force of the material to be magnetized can be abated by magnetizing in the state at high temperature so that the rare earth cobalt base magnetic material may be easily magnetized even by the magnetizer in relatively small output. Later, the coercive force can represent the original high value again by restoring the material to the room temperature. |
