| 摘要 |
PURPOSE:To prevent a cutter from blinding and to execute a cutting work with a high efficiency by fixing a blocks having a dressing action on to a substrate close to the end face of a powder metallurgical product crossed with the plane including the cut face by a cutter, and executing cutting with a voltage being impressed between the cutter and substrate. CONSTITUTION:A conductive circuit is formed among a cutter 2, powder metallurgical product (rare earth class permanent magnet) 6 and substrate 5, a pulse current is flowed, the dressing of the cutter 2 is continuously executed by this pulse current, and a highly efficient cutting is executed. Moreover, a block 8 composed of the material having a dressing action is fixed to the end face of a powder metallurgical product 6 crossed with the plane including the cut face by the cutter 2, namely onto the substrate 5 at the vicinity of the end face to be cut. Consequently, the dressing of the cutter 2 can be executed automatically by this block 8 each time of cutting, and the clogging of the cutter 2 can be prevented. |
