Research And Application Of High Speed ​​Milling Technology For Thin - Walled Titanium Alloy

Titanium alloy is widely used in aerospace field for its advantages of high specific strength, high thermal stability and good corrosion resistance. However, due to the poor stiffness of thin-wall parts and cutting force in high speed milling, it is easy to deform and reduce the machining accuracy. Therefore, the study of high speed milling of titanium alloy thin-wall parts is of great significance. In this paper, the deformation of high speed milling of thin-wall parts of Ti6A14V alloy was studied by finite element analysis and experiment.Firstly, a 3D model of high speed milling titanium alloy was established by ABAQUS. The stress distribution, temperature distribution and the curve of cutting force were obtained. Then, the research of the law of cutting force and cutting temperature under the different cutting parameters were carried out. Results show that the cutting force changes little with the increasing of cutting speed. The order of the cutting parameters which influence the main cutting force is axial depth, feed per tooth, radial depth and cutting speed. The influence of cutting speed on cutting temperature is the most significant, followed by feed per tooth and cutting depth, and axial depth is the least. Besides, a milling experiment was carried out which confirms the correctness of the finite element model.Secondly, the orthogonal test of the Ti6A14V cutting force was finished. Based on the regression analysis of the experimental data by MATLAB, the empirical formula of cutting force (radial force) was obtained, and the correctness of the model was verified.Then, established the finite element model of two kinds of typical titanium alloy thin-wall parts by ANSYS, and the validity of the finite element model was verified by comparing the simulation results with the actual measurement data. The deformation of thin-wall parts with different cutting parameters, workpiece size and parameters combination were simulated. The deformation law of the thin-wall parts is summarized, and the method of thin-wall parts machining is presented. It provides guidance for production practice.Finally, the method of restraining the deformation of thin-wall parts was proposed, and optimized the cutting parameters of the High damper base for Aerospace by orthogonal test. By the range analysis and variance analysis of the results, the order of the cutting parameters which influence the machining deformation were obtained:feed per tooth, axial depth, radial depth and cutting speed. And Optimal parameters combination was obtained.