Parameter Optimization Of Precision Milling Of Aviatic Titanium Alloy Structure Part

In aerospace industry and national defense industry, the titanium alloy is widely used as the material of large aerospace engines component and frame component because of a series of good characteristics such as high hot strength, high specific strength, good resistance to corrosion and good chemical activity. As the titanium alloy is a kind of difficult-to-cut material, the process-cycle is long, the production costs is high and the parts'quality is hard to be guaranteed. Therefore, further study with the manufacture method of titanium alloy precision milling has great significance on improving the researching and developing capability and production capacity of our country on the new engine, utmost developing the potentiality of machine and equipment, promoting upgrade of the military enterprises'manufacturing technology.The visualization user interface is constructed using programming language(Python)and ABAQUS GUI Toolkit in this paper, the parameterized modeling is realized for titanium alloy TC4 precision milling process through re-development technology with ABAQUS powerful functions in order to reduce the workload manual operation, avoid the repetition of the experiment and increase the calculation efficiency.The finite element model of the milling process of TC4 is established based on the material damage theory. By computer simulation,the influence of different geometrical parameters of cutters (rake angle, clearance angle, helix angle) on cutting forces and temperature is researched, the tendency of cutting forces and temperature changing with different geometrical parameters is compared. Under given condition, the angle range of milling tools for TC4 is decided.Through theoretical analysis, the instantaneous milling force model of the milling process of titanium alloy TC4 is established and tested by the experiments. The experiments are designed by two regression orthogonal rotating combination method. The prediction model of cutting force,surface topography and surface roughness changed with cutting parameters is set up using the data measured by dynamic force measurement Kistler9265B and talysurf TalysurfPGI1240 in order to optimize the cutting parameters.In order to guarantee the machining precision, the cutting parameters are always so small, which eventually led to low processing efficiency and high production cost. Based on genetic algorithm (GA), the optimization model of titanium alloy milling process is established in this paper, the cutting parameters are optimized to maximize the productivity and minimum the processing cost by making program using optimal design software.