| 摘要 |
PURPOSE:To increase retaining force for abrasive grains with intermetallic compounds by inserting a metal core of Al to Al alloy inside a mold having its inner surface coated with mold release agent, filling the gap with single material out of abrasive grains of diamond or the like, mixture of metallic powders of iron, Ni, and Ti or mixture consisting of some of them heating them up into dissolution, and rotating them. CONSTITUTION:After mold release agent is applied inside a mold 9 and dried out, a metal core 11 made of Al or Al alloy is inserted inside the mold, dense mixture of abrasive grains (17a), (17b) and iron powders (15a), (15b), and Al powder in case required from a manufactur ing condition, is charged into the gap 10 between the metal core and the mold inside surface. Thereafter, the mold 9 is heated up inside a dissolving furnace or a centrifugal machine with a heater dissolving furnace, the core metal 11 is dissolved. While the temperature of the mold is maintained between 650-800 deg.C for a several to 30 minutes, intermetallic compounds (16a), (16b) are formed on the surface portion of the iron powders (15a), (15b) mixed with the abrasive grains. With a motor driving, a turning table 4 and the mold 9 are rotated, thereby an abrasive grain layer 14 is impregnated with the dissolution, the dissolution is slowly solidified in high temperature circumstance. A grindstone well impregnated with the dissolution is formed, and its surface 18 is dressed. The abrasive grains are projected on the surface 19. Retaining force for the abrasive grains increases with the intermetallic compounds. |
