Subsurface damage in grinding of brittle materials considering machining parameters and spindle dynamics

摘要

Machining-induced damage severely affects surface and subsurface integrity in grinding of brittle materials. In this paper, a predictive model of subsurface damage (SSD) is proposed that takes into account grinding parameters and spindle dynamics. Results show that the grinding depth affects SSD, and the model neglecting the effect of tool forced vibration underestimates damage. The subsurface quality can be improved by increasing the grinding wheel surface speed or lowering the workpiece speed. Increasing frequency ratio tends to improve subsurface quality. Nonmonotonic dependence of SSD on the damping ratio is found. When the frequency ratio is greater than 1, the depth of SSD first increases and then decreases as the damping ratio increases. Good correlations between predictions of SSD and experimental results are observed in grinding of optical glass BK7.