Aviation High Speed Milling Of Titanium Alloy Ti6al4v Modeling Of The Surface Integrity

With the advances in aerospace technology,titanium alloy Ti6Al4V due to its heatresistance, corrosion resistance, strength and good plasticity, is widely applied to hightemperature, high pressure and high speed and other special conditions, and the requirementto meet better fitting accuracy, fatigue strength and wear resistance, surface integrity of higherstandards. Mainly in the surface residual stress, surface hardening and surface roughness onthe surface of the integrity of research.The rapid development of computer technology makes the application of the finiteelement method more and more on high-speed machining surface integrity. This paperdescribes some of the key technologies of the finite element method in high-speed machining,the overall control equation of the finite element method for high-speed cutting, the geometrymodel of the finite element, the constitutive equation of the material, the friction model, chipseparation criteria, chip fracture criterion, cutting process in heat transfer and dissipation.Explore the finite element model, combined with Ti6Al4V in the actual processing of the feedper tooth and axial depth of cut small, reasonable simplification oblique cutting model. SHPBtest measured at different strain rates, the various temperature stress-strain curve, the softwareMatlab fitting out of the Power-law material constitutive model.Based on Oxley cutting model, combined with Power-law material constitutive modelingestablished the prediction model of residual stress. Designing an orthogonal experiment, usingthe finite element software Third Wave AdvantEdge researched surface residual stressdistribution range on cutting parameters and tool parameters and analysis to identify theoptimal combination of parameters of the minimum surface residual tensile stress.Explore the formation mechanism of the surface work-hardening, that the depth strainedlayer of workpiece corresponding to the depth of hardened layer of workpiece, the equivalentstrain corresponds to the degree of work hardening of the surface microhardness. Orthogonalexperiment was designed to study the effects of cutting parameters and tool parameters on thesurface of the work-hardening, and the optimal level of each factor and the optimalcombination of all the factors through range analysis. Using single factor, researched workhardening of the workpiece surface on the initial temperature of the workpiece,the type ofcutting tool materials and coating material.By orthogonal test program and experiments, researched the surface roughness oncutting speed, axial depth cutting, per tooth feed rate, radial depth of cutting. Using rangeanalysis, obtained the main factors affecting the surface roughness sub-sequence and theoptimal combination of better surface roughness. Established the index empirical formula forpreferably the surface roughness of the fitting for the actual production of the surfaceroughness.