Research On The Prediction Of Milling Deformation And Parameter Optimization Of Titanium Alloy Thin-walled Parts

Titanium alloy has been widely used in the field of aeronautics and astronautics because of its excellent corrosion resistance,high specific strength and fatigue resistance.However,the high cutting temperature,serious tool wear and low material heat conductivity make it easy to deform in the process of milling titanium alloy,which will reduce the machining accuracy of parts.Therefore,aiming at the problem of machining deformation of titanium alloy thin-walled Cshaped parts in the stage of side milling and finishing,this paper uses the finite element simulation technology and partial least square regression algorithm to predict the overall machining deformation of thin-walled C-shaped parts,and verifies the accuracy of the prediction model by experiments,and explores the method of milling deformation prediction and machining parameter optimiz ation for thin-walled parts,so as to achieve the highest machining efficiency In order to optimize the milling parameters of thin-walled C-shaped parts,a human-computer interaction system with the function of deformation prediction and parameter optimization is developed.The specific research work is as follows:Aiming at the problem of milling force prediction in the dynamic simulation of titanium alloy TC4,a three-dimensional thermo mechanical coupling finite element model of milling process of titanium alloy TC4 is established,and the distribution of milling force,temperature,stress and strain in the milling process is studied.The milling force experiment is carried out,and the milling force value obtained from the simulation is compared with the experimental value to verify the accuracy of the simulation model.Aiming at the problem of deformation prediction in the finite element simulation of titanium alloy thin-walled C-shaped parts,two methods of dynamic simulation and static simulation are used to predict the machining deformation of the local and overall structure of thin-walled C-shaped parts.The machining deformation rules of thin-walled C-shaped parts are verified and analyzed by experiments,and the thin-walled C-shaped parts are calculated by the finite element static deformation model verified by experiments Maximum machining deformation of wall C-shaped parts.In order to optimize the milling parameters of thin-walled C-shaped titanium alloy parts,the partial least square regression model is used to establish the nonlinear mapping relationship between the milling parameters and the milling deformation of thin-walled C-shaped parts.The genetic algorithm is used to optimize the milling parameters of thin-walled C-shaped parts with the objective function of minimizing the machining deformation and maximum production efficiency.Based on MATLAB visual programming,the deformation prediction model and milling parameter optimization model in this paper are integrated into the milling parameter optimization system of thin-walled parts,so as to realize the rapid prediction of milling deformation and optimization of milling parameters of thin-walled C-shaped titanium alloy parts.