| 摘要 |
PURPOSE:To prolong the life of a rotary machining tool for inorganic construction material by arranging electrically attached abrasive grin parts and brazed abrasive grain parts, wherein each abrasive chip is brazed fast, at the cutting face of a tool body in its rotational direction. CONSTITUTION:A tool body 1 having a larger dia. than the shaft part 5 is affixed at its surface with electrically attached abrasive grain parts 2 with a certain spacing in the circumferential direction, and between these parts 2, 2, each abrasive grain chip 3 consisting of sintered abrasive grins is brazed fast to constitute brazed abrasive grain parts 4. Here the size of abrasive grains in said electrically attached parts 2 shall be greater than the size of abrasive grains in the brazed abrasive grain parts 4, and the height H from the base surface of the electrically attached abrasive grain part 2 be made greater than the height h in the brazed abrasive grain parts 4. Accordingly, even through abrasive grains in the electrically attached parts come loose, machining can be continued by the brazed parts, which should prolong the life of service.
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