Research On Cutting Temperature And Tool Wear Of Titanium Alloy Complex Surface Machining

It is the key to ensure the overall machining quality and improve the efficiency of the machining system to in-depth study the cutting temperature and tool wear of complex surface of titanium alloy.This article adopts the method of simulation analysis and cutting experiment verification,The change of effective cutting speed of ball end milling cutter under contour curved surface has been studied,The grey correlation between cutting temperature and cutting force,wear amount,chip and effective cutting speed was studied,the thermodynamics problems of tool wear mechanism of ball end milling cutter was analyzed,and the wear of rear cutting surface was predicted.Through the secondary development function of Deform-3d software,the cutting of complex curved surface is completed.The effective speed of ball-end milling cutter for machining contour curved surface was studied.Considering the change of inclination Angle and curvature radius of workpiece during the milling process,the interference model of ball end milling cutter cutting concave and convex contour curved surface is established.The interference problem of high Angle milling is solved by using the method of constant relative machining inclination.The results show that the effective cutting speed is small when the surface is machined with small cutting Angle and large cutting Angle.When milling concave curved surface,it is greatly affected by cutting depth,while convex curved surface is greatly affected by front and back tool path.The cutting temperature of the curved surface machining of titanium alloy was studied.Based on the theory of cutting temperature,the heat conduction model of two-dimensional matrix cutting is established.Deform-3d software was used to simulate the whole metal cutting process,and the cutting temperature of concave and convex curved surfaces was obtained.The grey correlation between cutting temperature and cutting force,wear amount,chip and effective cutting speed was further studied.In general,the maximum temperature of a convex curved surface is smaller than that of a concave curved surface.In concave curved surface,effective cutting speed has the greatest influence on cutting temperature,while in convex curved surface,effective cutting speed and the volume of chip have the greatest influence on cutting temperature.Tool wear in curved surface machining of titanium alloy was studied.On the basis of the mechanism of tool wear with cutting temperature is related to the oxidative wear,diffusion wear and adhesion wear a thermodynamic analysis,Redefining the wear area of the rake face as an evaluation standard for the wear amount of ball-end milling cutters for machining complex curved surfaces,using the simulation data verified by the wear experiments,the wear prediction model of BP neural network and multiple linear regression was further established and compared.Through thermodynamic analysis,it is found that oxidation wear,diffusion wear and bond wear exist simultaneously.The relative error of wear area rate of concave and convex curved surfaces compared by experiment and simulation is less than 20%.The prediction of neural network is more accurate than that of regression analysis.The accuracy of the overall prediction of a concave curved surface is greater than that of a convex curved surface.Based on the secondary development function of deform-3d software,the cutting of complex curved surfaces is completed,Including the numerical simulation of general three-dimensional curve and special vane three-dimensional curve tool trajectory..In the secondary development of general three-dimensional curve trajectories,the simulation and theoretical trajectory scatter fitting curves have similarities,and the cutting force and cutting temperature have similar general trends.The overall increase first and then decreases,and then increases and then decreases,and an extreme occurs around 4.5s Small value,the wear area of the flank face during smooth process is more intuitive and easy to observe and read.In the secondary development of three-dimensional curved trajectories of special vane,the model of single vane is simplified,and the ball end milling cutter completes the three-dimensional movement of closed-loop trajectory,which fully demonstrates the correctness of cutter position trajectory point in the Ug programming.