Abstract:Taking YK7350B NC forming cycloid gear grinding machine as the research object, the vibration of motorized spindle caused by dynamic grinding torque and self-unbalance under the condition of high-speed rotation was studied. Through the transfer matrix method, the dynamic mathematical model of grinding motorized spindle system was established, and the natural frequency of the motorized spindle was calculated by combining the specific parameters of the motorized spindle. Then the vibration mode and frequency of the sixth mode were obtained by using the finite element analysis software. Finally, the vibration acceleration data of the electric spindle under normal working conditions were collected through the actual grinding experiment. The experimental results show that the vibration characteristic of spindle has the greatest influence on the Z direction of grinding, followed by the X direction, and the vibration characteristic increases linearly with the increase of grinding speed.This conclusion provides theoretical support for the subsequent vibration principle analysis of motorized spindle, vibration reduction, machining quality improvement of cycloidal gear tooth surface.