A Consideration on the Sparking in Heavy Grinding of Silicon Nitride Ceramics by Cast Iron Bonded Diamond Grinding Wheel

Abstract

The cast iron bonded diamond wheel can be applied to heavy duty grinding of ceramics. When the protrusion amount of abrasives from bonding surface is not enough, the sparking phenomena occurs by the direct contact between bond materials and ceramics in heavy duty grinding. As this sparking leads to dressing effect, it is named “spark dressing.” Sparking is confirmed indirectly to be occurred by the temperature rise of ground chip of ceramics under the insufficient supply of coolant. This can be eliminated by making the bonding material brittle or removing the material continuously.