Research On The Tool Life Optimization Of Micro-Texture Ball End Mill Machining Titanium Alloy

As a kind of high performance alloy material,titanium alloy has been widely used in various fields,such as chemical,aviation,ship,medical equipment and so on.In the process of milling titanium alloy,due to the titanium alloy materials have low thermal conductivity,low modulus of elasticity and high chemical activity at high temperature,and the contact length between the chips and the rake face is extremely short,the heat produced during cutting is difficult to pass out,and is concentrated in the cutting deformation zone and the smaller range near the cutting edge,a very high cutting temperature will be produced at the cutting edge,which will greatly shorten the tool life.A reasonable micro-pits texture is prepared on the carbide ball end milling cutter,which can effectively improve the cutting performance of the tool and prolong the tool life.This paper is based on the National Natural Science Foundation of China(item number: 51375126)“Study on wear resistance mechanism of miso-geometric features of cutting tool and its influence on high speed milling surface”,to study the tool wear characteristics of micro-texture cutter for milling titanium alloy,and Multi-objective optimization method is used to optimize the tool life of high-speed cutting titanium alloy with micro-textured cutter.Firstly,the influence mechanism of the insertion of micro texture on the cutter's cutting performance is theoretically analyzed,and the corresponding milling experiment is carried out,to analyze the variation rule of cutting force with cutting stroke during high speed milling of titanium alloy with micro-texture cutter and common cutter.Ultra depth optical microscope and scanning electron microscope is used to observe the variation situation of the wear of ball end milling cutter's t rake face and flank face with the cutting stroke,the corresponding energy spectrum analysis is carried out,so as to finish the mechanism analysis of reducing wear and wear resistance of milling titanium alloy's micro texture ball end milling cutter.Secondly,the solid model and the work-piece material model of ball end milling cutter with different texture parameters are established by using UG software,and use the finite element simulation software Deform-3D to establish the three-dimensional simulation model of milling titanium alloy by ball-end milling cutter with different texture parameters,and then the corresponding pretreatment and post-processing operation are completed,so as to complete the simulation analysis of cutting temperature and tool wear.The corresponding orthogonal test is designed to study the influence of micro texture parameters on cutting performance,tool wear situation and tool wear mechanism,and the initial optimization of texture parameters is completed by using the range analysis.Finally,the multi-objective optimization method is used to establish a multiobjective optimization model,which is using the micro texture parameters as the design variables and using the wear of rake face and flank face as the objective function,in order to optimize the reasonable micro texture parameters,and reduce the tool wear and prolong the tool life on the basis of ensuring the quality of processing.The optimization results are verified by experiments,and the reliability of the optimization results is proved.