Study On Tool Wear And Surface Residual Stress In Milling Titanium Alloy

Titanium alloy materials are widely used in many high-end fields for the manufacture of related precision parts due to their high strength,good corrosion resistance and other excellent characteristics.However,titanium alloys are difficult to machine.The tool wear in the cutting process is too severe,which seriously affects the machining accuracy and surface quality of the finished workpiece,and thus cannot meet the required machining requirements.Therefore,it is crucial to study the tool wear of titanium alloys.In this paper,the wear of titanium alloy milling tools and the residual stress on the machined surface are studied in depth.The research contents are as follows:(1)Taking TC4 milling with carbide tools as an example,the rule of tool wear under thermal mechanical coupling in milling process is studied in this paper.The tool wear model considering the wear mechanism of abrasive,adhesive and diffusion was established.On the basis of it,the ABAQUS finite element simulation is carried out,and combined with the secondary development technology,through changing the cutting parameters,the change of tool wear rate is obtained.It is concluded that with the increase of milling speed,the change trend of tool wear rate is rising,and the tool wear is faster.The rationality of the simulation results is proved by experiments.(2)Carry out orthogonal analysis of cutting force through finite element software ABAQUS,and compare the test results with the simulation results.Then,set reasonable cutting parameters and vibration parameters based on the results of orthogonal analysis and tool modal analysis.Based on this,carry out two-dimensional milling vibration simulation through finite element software Advantedge,and judge the stress nephogram and temperature nephogram obtained from the simulation,The influence of many cutting vibration factors on tool wear is obtained.(3)Through the finite element simulation software to establish the relevant milling simulation,change the relevant parameters,through the tool wear,to study and analyze the influence of the residual stress on the machined surface.It is concluded that in the direction S22 of the machined surface,the surface residual stress is compressive stress and gradually becomes tensile stress,while in the direction S11,the surface residual stress is tensile stress,which will gradually become compressive stress with the increase of the depth from the workpiece surface.And with the increase of tool wear,the residual stress of machined surface also increases.