Milling vibration suppression of thin-walled structure based on electromagnetic induction

There are many thin-walled structures in aircraft. Due to the low flexibility of structures, work-piece deformation and deflection occur easily during the machining, which causes low precision and low surface quality. Therefore, much has been done to investigate the machining process, deflection prediction and control technology of thin-walled structure machining. However, real application in the industry is still a challenge. In this paper, a vibration suppression device for the thin-walled structure is investigated and designed based on electromagnetic induction. The workpiece vibration is utilized in order to cause a change in the magnetic flux through the closed circuit, so the resulting magnetic force can contribute to the suppression of workpiece vibration. The magnetic force resulting from the movement of the magnet inside the copper tube is formulated. It is shown to vary linearly with workpiece velocity in the opposite direction. Impact tests show that the device can sharply attenuate the oscillation time, and the chatter stability simulation shows that the stability limit of the thin-walled workpiece is increased from 0.4 mm to 5.1 mm. Cutting tests are carried out to verify the final vibration suppression effect.