Study On Wear Difference On Flank Face Of High-Feed Milling Cutter

High-feed milling cutter,a typical tool for milling large titanium alloy structural parts,is widely used for milling important parts of aerospace products.During the cutting process with high-feed milling cutter,the impact caused by discontinuous cutting and the milling vibration change the instantaneous cutting position and cutting attitude,which lead to the wear status on cutting edges and flank faces of teeth exist obvious difference after and directly affects the service life of milling cutter.It has became a large structure milling machining quality and machining efficiency of titanium alloy to improve the bottleneck.Based on the national natural science fund project "Wear multi-scale coupling mechanism of nonlinear friction dynamics of efficient milling cutter(51875145)" and the enterprise cooperation project with the chengdu aircraft industrial(group)company "Large titanium alloy structure parts tool life precise control technology",the wear characteristics on flank face of tooth for milling titanium alloy with highfeed milling cutter is studying to reveal under the formation mechanism of wear difference on flank face of tooth under the vibration.To reveal the wear characteristics on the flank face of the high feed milling cutter’s teeth,adopting high-feed milling cutter with diameter of 32 mm,the experiment for milling titanium alloy is carried out,and the wear status on flank face and cutting edge of teeth are analyzed.According to the tooth structure and its installation and positioning way,a method of measuring the wear on flank face is proposed to obtain the characteristic parameters of the cutting edge and flank face of tooth and established the wear boundary functions of the cutting edge and the flank face of tooth and then the cutting edge and the flank face of tooth is revealed with the cutting stroke.Based on the variable characteristics of the feature parameters of the with the cutting stroke,the wear difference on the flank face is characterized in milling process.The cutting motion analytical model of milling cutter is established and the calculation method of the dynamic cutting behavior of milling cutter is proposed.Aiming at the influence of milling cutter axial stratification cutting mode,cutter tooth error and milling vibration on the instantaneous contact relationship and thermal load of the cutter,the model of milling cutter and titanium alloy workpiece and the simulation boundary conditions of the thermodynamic coupling field of the cutter face behind the tooth were reconstructed,and the thermodynamic coupling field of the cutter face behind the tooth under the influence of the cutter tooth error and milling vibration was obtained.The characteristics of the equivalent stress,cutting temperature and wear of the back cutter surface along with the cutting stroke were studied.Taking the yield strength of the cutting edge and the wear depth of the back surface of the cutter as the criterion,a method of identifying the wear boundary of the back surface of the cutter based on the results of thermodynamic coupling field analysis is proposed and verified by experiments.In order to reveal the changing characteristics of the thermodynamic coupling field and the wear boundary of the back surface of the cutter tooth,an analysis scheme of the thermodynamic coupling field of the back surface of the cutter tooth was proposed.The influence of milling vibration on the distribution of equivalent stress and cutting temperature on the back surface of cutter teeth was studied.By comparing the difference of the wear boundary of the back surface of the cutter under different process conditions,the influence of vibration on the wear boundary of the back surface of the cutter was revealed.The thermal-mechanical coupling field analysis scheme and the experimental scheme of milling titanium alloy were designed to obtain the milling vibration characteristic parameters and the wear boundary characteristics of the flank under different cutting stroke.By comparing the characteristic curves of the flank wear boundary and the flank wear boundary of the flank,the newlyweds’ accuracy and reliability of the simulation method for the difference of the flank wear of the cutter teeth were verified.