Study On Cutting Force In Elliptical Vibration Turning

The elliptical vibration cutting (EVC) is a new processing technology developed in recent years, which can be used to improve the material machining efficiency and obtain the machining motion that satisfied micro turning, and so on. Cutting force is an very important physical quantity in the process of machining, however the study on cutting force in the process of EVC has been carried out not enough, the reports have been published less. This dissertation will focus on the cutting force to carry out the research in the process of EVC.According to the thin shear plane theory, space relationship between the transient cutting speed, transient shear velocity and chip transient velocity was analyzed under the hypothesis that tool is sharp enough, and ignoring the influence of tool edge arc radius. Definition of the transient relative speed angle was made, according to the maximum shear stress theory and space relationship of cutting force during machining, the relationship between each related angle and t was established, then a model of cutting force was established.Using the general finite element analysis software ABAQUS to establish a finite element model of machining Titanium alloy in 3D EVC. Through the simulation of machining process, influence of tool rake angle, vibration amplitude, vibration frequency, cutting speed and depth of cut on the cutting force were obtained, influence of different EVC parameters on principle cutting force, thrust cutting force and normal cutting force were analyzed, which provides theoretical basis for the optimization of tool geometric parameters and cutting parameters in actual machining.A residual stress analysis model of machining Titanium alloy in 3D EVC was established, the changing process of residual stress was analyzed by changing cutting speed, depth of cut, vibration amplitude and vibration frequency through numerical simulation, which provides theoretical basis for the optimization of cutting parameters in 3D EVC and then to improve machining quality and efficiency.A diamond tool cutting experiment was carried out by using 2D EVC device in ultra-precision lathe, cutting force in the EVC cutting process was obtained by using a Kistler dynamometer in real time, then compared with the simulation result from the model of cutting force, the model of cutting force was verified.