| 摘要 |
PURPOSE:To maintain an abrasive in the optimum exposed condition while retaining thenecessary binding degree of the abrasive and ehnahce the cutting performance of a rotary grindstone blade by providing a rugged part on both side surfaces of the cutting edge part of the blade by electric discharge machining. CONSTITUTION:The rotary grindstone blade 6 formed by binding an abrasive with an electrically conductive binder, is fixed to a rotary shaft 10, and an electrode is provided by forming a recessed groove 15 on the entire outside circumferential surface of a disk body 11 perpendicularly to the shaft 10 and opposite to the cutting edge part of the blade 6. In addition, the disk 11 is fitted to a rotary shaft 16 parallel to the rotary shaft 10 for the blade 6 in such a manner that the disk 14 can be freely moved toward and away from the shaft 10 for the blade 6. |
