EXPERIMENTAL STUDY ON DRY ELECTRICAL DISCHARGE ASSISTED TRUING AND DRESSING OF DIAMOND WHEEL

Abstract

Through combining electrical discharge thermal effects into the process, dry electrical discharge(dry-ECD) assisted truing and dressing opened a new avenue for reducing the wear rates of diamond dressers. Because the diamond wheel is mounted on the optical projection profile numerical control grinding machine, dielectric liquid is forbidden. The new dry-ECD dressing/truing method basically eliminates the use of dielectric liquid. In order to compare the wear ratios in dry-ECD assisted dressing with those in mechanical dressing, some comparative experiments are done. Experimental results show that the wear ratios of diamond dressers in the dry electrical discharge assisted dressing depend on electrical discharge density distribution, input voltage, depth of cut, and feed rate. Because of the different material removal mechanisms involved in these two truing methods, the wear ratio of diamond dresser in dry-ECD assisted dressing is much higher than that in the conventional mechanical dressing. The experimental results show that dry-ECD assisted truing and dressing diamond wheel has the same grinding capability as the new diamond wheel from the grinding of YG8 hard carbide.