| 摘要 |
PURPOSE:To make it possible to press-fit other members and to use the title permanent magnet as various kinds of sensors by a method wherein, after an aging treatment has been conducted on the press-fit expected section of the Fe-Cr-Co permanent magnet, malleability is given to the permanent magnet by conducting a heat-softening treatment at the temperature exceeding the re-aging temperature. CONSTITUTION:The large-calibered part 1b of a flat and cylindrical Fe-Cr-Co permanent magnet 1, on which a liquefying treatment and an aging treatment are conducted after it has been formed into the required shape, is dipped in a cooling container 11 containing a chemical solution and the like. A high frequency oscillation coil 12 is arranged on the outer circumferential part of the small-calibered part 1a, and a current of 100 to 200A or thereabout is applied to the coil 12 for 5 to 20 seconds. As a result, the small-calibered part 1a can be heated up to the temperature of liquefying treatment in a short period, and the large- calibered part 1b can be maintained at the aging treatment temperature or lower. The small- calibered part 1a of the heated part only is softened, malleability is given to it, press-fitting integration with other member can be made possible, and the intrinsic magnetic characteristics of the Fr-Cr-Co permanent magnet can be manifested by the large-calibered part 1b which is maintained in a cool state. |
