THEORETICAL ANALYSIS OF THERMAL PROFILE AND HEAT TRANSFER IN GRINDING

Temperature in grinding is one of the major factors, affecting the quality of the ground surface. A review of thermal modelling approaches in grinding is presented. During grinding, heat is generated at the wheel-work interface. This problem can be likened to Jaeger’s moving heat source, by analogy. The general solution of moving heat source problem by J.C. Jaeger is applied to the grinding process. Rectangular, triangular and parabolic laws of heat flux are tested to represent the grinding zone (a moving heat source) and the resulting temperature distributions are compared. Triangular heat source predicts the thermal profile with 10% error. The factors influencing the temperature for burn are identified by thermal modelling. A re-look at limiting temperature for burn incidence indicates that limiting value is higher than Ac1 temperature for steel. Modelling of the heat partition is helpful to assess alternate ways to control grinding temperature