THEORETICAL-ANALYSIS OF HEAT PARTITION AND TEMPERATURES IN GRINDING

A theoretical analysis is presented of heat partition and surface temp eratures for the grinding of hardened steel with both aluminum oxide a nd CBN wheels. The numerical predictions of the model are shown to agr ee with experimental results available in the literature. It is found that heat partition varies over a wide range depending on grinding con ditions. Also, heat partition is a strong function of position inside the grinding zone. The presence of the fluid inside the grinding zone can reduce the heat flux into the workpiece and the workpiece temperat ure significantly. For typical grinding of steel with CBN wheels, or c reep feed grinding of steel with aluminum oxide or CBN wheels, it is p ossible to keep the fluid active and therefore to reduce thermal damag e. However, the analysis suggests that the fluid may not be effective inside the grinding zone, in the conventional grinding of steel with a luminum oxide, due to boiling.