Finite Element Simulation Of High Speed Machining Ti6Al4V And Optimization Of Cutting Parameters

In the aerospace industry Titanium alloy is mainly consumption materials due to its excellent mechanical performance,low density and good corrosion resistance.However,titanium alloy is a kind of typical difficult-to-machine materials because of its poor thermal conductivity,high chemical activation in high temperature and low coefficient of thermal conductivity.The high cutting temperature is easy to appear in the process of high speed machining titanium alloy material,which leads to the out control of surface quality and tool wear.At the same time,most of large aircraft parts are of overall design and in the process of machining most of the allowances will be removed from blank materials,which will increase the machining cost of the workpiece.Although in some special field titanium alloy parts have been produced using 3D printing technology,it is not suitable for mass production due to high costs.Hence this problem urgently needs to be solved to achieve rapid,efficient machining of titanium alloy in the field of aviation manufacturing industry.This paper aims to solve the problem of high temperatures and large cutting forces in the process of machining titanium alloy from the angle of the cutting tool geometry parameters through getting the optimized combination of cutting tool geometry parameters.Through to study the status of high speed machining of titanium alloy and high speed machining theory,learned some key technologies of finite element simulation of cutting process.After analysis some the key techniques such as knife-chip friction model,the chip separation criteria,material constitutive model,three-dimensional orthogonal finite element model of carbide tools high speed cutting of titanium alloy Ti6Al4V was established by the professional cutting simulation software AdvantEdge.By change cutting tool geometry parameter(rank angle,clearance angle and cutting edge)to simulation acquire different parameter combination's date result acquire the influence rule of every parameters on the cutting force and cutting temperature.Using quadratic response surface method to fitting cutting force and cutting temperature data,which from the simulation of different cutting tool geometric parameters,the function relationship model between the tool geometric parameters and cutting temperature and cutting force has been acquired.Then,after constraints the cutting tool geometry parameter with the help of genetic algorithm(ga)optimization program obtain the suitable for Ti6A14V material of cemented carbide cutting tool geometry parameter combination.According to the result of optimization of custom cutting tools and conduct actual test,the test results show that the optimized cutting force and cutting temperature is relatively good.