| Titanium alloy material is the important material in aerospace field.On the one hand,Titanium alloy has excellent physical and mechanical properties.On the other hand,it is difficult to machining,resulting in its low machining efficiency and machining quality.This has also seriously hindered the rapid development of the aerospace manufacturing industry.Therefore,how to efficiently guarantee the processing quality of titanium alloy and improve the processing efficiency of titanium alloy reduce tool become the problems to resolve.As the performance requirements of aircraft become prevalent,many titanium thin-walled structural parts are widely used in aircraft.But these titanium alloy thin-walled structures tend to be less rigid,have less processing technology,in the processing process is easily affected by the cutting force and cutting heat and other deformation and deformation,affecting its processing accuracy and surface quality.So the research on milling machinability of titanium alloy thin-walled structure will improve the quality and efficiency of the surface of titanium alloy parts processing.This article mainly aims at the theoretical analysis and experimental research on milling thin-walls parts of titanium alloy TC4(Ti-6Al-4V).The main research content is as follows:(1)Based on the principle of calculus,by analyzing the single-layer mill milling milling force situation,the first derivative and integral method were used to establish the milling force model of titanium alloy TC4.The milling force was simulated by MATLAB software.Finally,the correctness of the established milling force model was verified by milling force measurement experiment.(2)The source and conduction of cutting heat were analyzed.A temperature model of milling was established by combining the heat source method and the cutter curve of the ball mill.The milling temperature empirical formula was solved by the orthogonal experiment of milling temperature.At the same time,the influences of milling parameters on the milling temperature were analyzed.(3)The phenomenon of thin-walled structural parts less milling is described.In order to reduce the deformation and improve processing accuracy,a method to improve the rigidity of thin-walled structure and improve the rigidity of milling cutter is studied.By Side Milling Experiment with TC4 Titanium Alloy Thin-walled Structure,the influence of different path of tool path on workpiece deformation was analyzed.(4)The surface quality of milling is analyzed theoretically.A residual height model after side milling is established and carried on the simulation analysis.The design completes the orthogonal test of the side milling of the titanium alloy thin-walled structural parts.A empirical formula of mean deviation Sa of milling surface is obtained.The influence of each milling parameter on the surface roughness was analyzed.Finally,taking into account both improve the efficiency of milling and reduce the milling surface roughness of these two optimization goals,milling parameters were optimized. |
