Ultrasonic torsional vibration side milling method in combination with stretching clamping

The invention discloses an ultrasonic torsional vibration side milling method in combination with stretching clamping. The ultrasonic torsional vibration side milling method specifically comprises the following operation steps of: 1, selecting a milling tool according to the property of a work material and an accuracy requirement; 2, calculating corresponding prestress aiming at the work workpiece material, mounting a workpiece on a clamp with adjustable stretching force to guarantee that the prestress direction is parallel to the workpiece feeding direction and then adjusting the prestress of a surface to be machined of the workpiece to a calculated value; 3, starting a machine tool and an ultrasonic generator, keeping torsional vibration frequency at 20 kHz and amplitude of a cutter at 10 microns, and adjusting the using amount of milling according to the required technological parameter; 4, feeding the workpiece along with a working table, performing ultrasonic torsional vibration while rotating the milling cutter until the material to be removed is machined; 5, retracting the cutter, closing the ultrasonic generator and the machine tool, cooling and then unloading the workpiece; and 6, if continuously machining the workpiece, repeating the steps 1 to 5. According to the ultrasonic torsional vibration side milling method in combination with stretching clamping, the residual stress of a machining surface can be improved so as to further improve the fatigue strength of the workpiece, the cutting force and the cutting temperature can also be obviously reduced, the life of the cutter is prolonged, and the like.