ELECTRO-DISCHARGE DRESSER FOR METAL-BONDED DIAMOND GRINDING WHEEL

摘要

PURPOSE:To dress a grinding wheel so efficiently irrespective of the quality of a work and size of diamond abrasive grains, by installing a discharge accelerator, having conductive particles mixed in a grinding fluid sticking fast to a grinding surface, separatably in this grinding surface. CONSTITUTION:While feeding a gap between a grinding surface of a metal- bonded diamond grinding wheel 1 in rotation and an electrode 10 being set up face-to-face in this grinding surface with a grinding fluid arc discharge is generated and the wheel 1 is pressed. At this time, an output signal out of a discharge state detecting circuit 11 is given to an input end at the negative side of a differential amplifier 20, comparing it with the reference value in a discharge state given to an input end at the positive side, and on the basis of the compared result, a motor 22 is driven, a screw 23 is moved, a discharge accelerator 25 composed of conductive matter is made contact with the grinding surface, and its conductive particles is mixed in the grinding fluid stuck on the grinding surface, whereby electro-discharge machining is accelerated, and wheel dressing is carried out in an efficient manner.