Analysis of Regenerative Chatter in Roll Grinding Process with Duffing Oscillator and Its Suppression

Regenerative chatter that is the most common type of self-excited vibration is investigated in this paper. The kinetic model of roll grinding process made up of a workpiece and a grinding wheel with the Duffing Oscillator is proposed. The three degrees-of-freedom grinding model system contains two time delays derived from the regenerative chatter of the grindstone and the cylindrical roll. Based on the model, the impact of the width of cut on the regenerative chatter is studied and the stable boundary is plotted in parameter plane. Afterwards, the curves of time history and the bifurcation diagram are used to identify the behavior of dynamic system. The results show that the width of cut has a significant influence on chatter in grinding process. In the end, the velocity feedback is introduced to suppress the regenerative chatter, which has a great effect.