GRINDING TEMPERATURES AND ENERGY PARTITIONING

In grinding, the heat generated is removed from the area of contact by conduction into the workpiece, conduction into the grinding wheel gra ins, convection with the material removed and convection to the fluid. The partition ratios in surface grinding were estimated from the meas ured temperatures using a thermocouple technique. A theoretical model for predicting the partition ratio at the grain level is presented. Th e theoretical model was correlated with measured results to validate t he model and establish the effective thermal conductivity of cubic bor on nitride (CBN) and aluminium oxide abrasives. The effective thermal conductivity of CBN was found to be considerably lower than the report ed theoretical value albeit much higher than the thermal conductivity of aluminium oxide. The findings provide the basis for improved predic tion of workpiece temperatures in grinding.