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Thermal Models of High Efficiency Deep Grinding and Grinding Temperature

Three thermal models are developed for high efficiency deep grinding, they are respectively circular arc heat source model, uniform heat flux distribution model and triangular heat flux distribution model. Mathematics equation of every thermal model is expressed. The three models take account of the oblique movement of the heat source plane, which is particularly important for the conditions of high moving speed and large oblique angle of the heat source plane. With the solutions gained from the models the temperature at the grinding zone of high efficiency deep grinding is investigated. Grinding experiments are done. Experiment results show that the measured temperatures are in agreement with the calculated temperature approximately. Introduction High efficiency deep grinding (HEDG) is characterized by high wheel speed, high workspeed and large depth of cut, HEDG gives rise to very different grinding conditions in contrast to the conventional shallow grinding and creep-feed grinding [1-6]. For the calculation of grinding temperature, most thermal models developed up to now handle the conditions in which the heat source plane is assumed to move with feed velocity v along the surface of a semi-infinite solid, i.e., ignore the existence of grinding depth ap and take the ground and unground surfaces as the same one; the source plane is thus parallel to its moving direction ( =0). For ordinary shallow grinding conditions, the assumption above is a good approximation to reality, but for those with deep grindings, e.g., in creep-feed grinding and high efficiency deep grinding, the depth of cut can reach the level of some 10 mm. It is obvious that the heat transfer solution under deep-cut conditions the above assumption should be modified and the effects of depth of cut ap and oblique angle should be taken into account.