| 摘要 |
PURPOSE:To permit the speedy reduction of the grinding resistance immediately after trueing by activating the breakage of abrasive grains by increasing the damage applied onto an abrasive wheel by grinding-working a dressing roll in the state where the peripheral speed is reduced below that in the normal grinding, immediately after the trueing of the abrasive wheel. CONSTITUTION:After the truing for an abrasive wheel 12 is completed, the revolution speed of a motor 13 for driving a grindstone is reduced by controlling a motor speed control circuit 40, and the peripheral speed of the abrasive wheel 12 is reduced below the normal speed. Then the cutting-in grinding work is carried out for a dressing roll at a constant speed. If the detection value of a grinding resistance detector 35 is larger than a standard value at this time, the grinding work for the dressing roll is continued, and if the detection value is less than the standard value, the grinding work is completed. Thus, the grinding work is carried out by reducing the peripheral speed of the abrasive wheel, and the damage of the grindstone 12 is increased by increasing the load per piece of the superhard abrasive grain, and the breakage of the abrasive grains is activated, and the formation of acute cutting edge is accelerated. Therefore, the rate of the reduction of the grinding resistance is increased, and the speedy restoration to the ordinary grinding resistance is permitted.
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