Prediction model of form error influenced by grinding wheel wear in grinding process of large-scale aspheric surface with SiC ceramics

Because of the material characteristic of high hardness and high abrasion resistance of SiC ceramics, grinding wheel wear is an essential problem which must be taken seriously and be solved in grinding process, especially in grinding of large-scale aspheric surface. In this paper, a ground aspheric surface form error model in large-scale aspheric surface grinding process of SiC ceramics is built without considering any other conditions but just radius wear of the grinding wheel. In this model, volume grinding ratio is employed to combine the wear volume of the grinding wheel and the removed volume of SiC ceramics. Experiments are conducted to corroborate the feasibility of the model, and the results reveal that the forecast error between the predicted value and the experimental value is less than 15 %. Considering the assumptions and interference of other factors, the form error model is acceptable.