Vibration suppression of NC machining based on eddy current dampers

Large deformation and cutter run-out easily occur during the machining of flexible structures, which quite affect machined surface quality and efficiency. An eddy current damper was proposed to suppress the machining vibrations based on the force generated by electromagnetism induction. According to the theoretical model, four design schemes were proposed, tested and compared. Modal tests showed that the amplitudes of their frequency response functions were reduced and the maximum drop was 55%. Furthermore, modal parameter identification showed that the damper can increase the system damping by 70.73%, but it affected other dynamic parameters little. Cutting tests indicated that the eddy current damper can increase the critical cut depth by 171%, reduce vibration amplitude by 58% and decrease surface roughness by 89.7%.