Research on three-dimensional ultrasonic vibration-assisted turning cutting force

Three-dimensional ultrasonic vibration-assisted turning with a dual-frequency drive can improve the machinability of workpieces. The output path of the vibrating tool nose in this method is a complex Lissajous closed curve, which results in the change of the instantaneous cutting force generated by the vibrating tool at different times. Therefore, when evaluating the instantaneous cutting force of this method, it is necessary to determine the equivalent plane at the cutting point at different times, and the orthogonal transient cutting force model is established in the equivalent plane. The effects of ultrasonic vibration and machining parameters on the cutting force generated by three-dimensional ultrasonic vibration-assisted turning are analyzed. It shows that the reasonable selection of ultrasonic vibration displacement and machining parameters can obtain lower cutting force. Among them, the vibration displacement in the cutting speed direction and the cutting depth have the largest contribution to the cutting force. Finally, a single-factor comparison experiment was carried out for different turning methods. It shows that when the cutting parameters are changed, the development trends of the cutting forces generated by the four turning methods are roughly the same. It also shows that the vibrating tool with a complex Lissajous curve trajectory can effectively weaken the cutting force. The research results of the manuscript provide a theoretical basis and guidance for the development of three-dimensional ultrasonic vibration-assisted cutting methods.