Dynamic analysis of motorized spindle under axial disturbance of ceramic bearing inner ring

Full-ceramic spindles are widely used in precision machine tools due to their high rotational speed and high accuracy, due to the geometrical characteristics of angular contact bearings, axial perturbations and thus vibration can occur in highspeed rotations. In this paper, a 5-DOF dynamic model considering the axial disturbance of ceramic bearing inner ring is constructed and the vibration characteristics are analyzed. The vibration cycle laws and variations of the all-ceramic spindle are explained by time-frequency domain analysis, and the vibration test platform of the all-ceramic spindle in silicon nitride is built for vibration data acquisition. The results show that the average error between calculated data of model and the vibration amplitude of experimental results is 3.45%, which indicates that the model proposed is able to simulate the vibration state under the actual working conditions, and provides a certain theoretical basis for the study of the dynamic characteristics of ceramic spindle.