Numerical Simulation Analysis Of Thin-walled Milling In Titanium Alloy Based On Modified JC Constitutive Model

Titanium has very practical material properties,which is mainly used in medical devices,electrolysis industry,construction engineering and other fields.It is a very important metal material in the current intelligent manufacturing industry.However,the poor machinability of titanium alloy restricts its further application.The titanium alloy is still subject to large deformation coefficient on the surface of the titanium alloy due to the large machining efficiency of the titanium alloy.Finite numerical imitation can mostly save money and is a popular method to study milling mechanism.The method to increase the simulation is to acquire accurate material constitutive model,and the constitutive equation reflecting the real strain and the real temperature properties of titanium alloy materials can acquire accurate milling simulation results.Firstly,the stress-strain relationship of Ti6Al4V alloy was obtained by SHPB experiment.The strain of Ti6Al4V will decrease when the temperature rises in the plastic stage,and the flow stress of Ti6Al4V alloy will drop sharply when the critical temperature of high-temperature dynamic crystallization effect is reached At the same time,the Johnson Cook constitutive equation is modified combined with the dynamic crystallization effect at high temperature.The error rate is less than 8%,it can correctly reflect the relationship between profit and strain of Ti6Al4V under different loading temperatures.Secondly,the program of optimization pattern is written in element methods.The pattern of VUMAT includes stress renewal process,material yield,damage failure,etc.The prosperous secondary development of the simulation software ABAQUS,the three-dimensional model of frame type thin-walled parts is established,the cutting speed factors are analyzed,and the milling experiments of titanium alloy frame thin-walled parts with the same parameters are designed to verify the simulation data.It is proved that the perfect JC constitutive model greatly improves the foresight and can more accurately describe the cutting process of Ti6Al4V alloy in intelligent CNC machine tools the mechanical behavior of.Finally,based on the milling simulation results of Ti6Al4V alloy frame thinwalled parts,the orthogonal experiment is designed to reduce the deformation of titanium alloy frame workpiece,improve the energy consumption rate of the machine tool.The four cutting elements are taken as plum blossom variables.The four cutting elements are improved through the extraordinary beautification algorithm in MATLAB.Finally,the milling experiment of Ti6Al4V alloy frame thin-walled parts is designed,which proves that the optimized milling parameters have good cutting performance.