The Simulation Research On The Machining Mechanism During High Speed Cutting Of Titanium Alloys

The titanium alloy had been more widely used because of its irreplaceable superiorcharacteristics, and the demands for its production and manufacturing were more andmore. As titanium alloy is a typical difficult to machine materials, it is the currentproblems to be solved that high efficient processing of titanium alloy, so the simulationresearch on the machining mechanism during high speed cutting of titanium alloys wasextremely important.Based on the metal cutting theory and finite element analysis, in this paper,thesimulation model of high-speed cutting of titanium alloy was built by finite elementsoftware, the key technologies such as the friction model,chip separation criteria andfracture criteria which were needed in cutting simulation were determined. Firstly, thecutting force during the high-speed cutting of TC4was analysed based on theorthogonal experimental method through the three-dimensional simulation model, thereliable empirical formul was obtained, and the effects of cutting parameters on cuttingforce were analyzed. Secondly, the chip formation process of TC4was simulated by theorthogonal cutting program; the formation mechanism of serrated chip was analyzedand the influence of the tool rake angle and cutting parameters on chip shape wassummarized. Finally, the distribution of residual stress on machined surface during thehigh-speed cutting of TC4was studied by simulating the effective process route, theinfluence of the cutting speed and tool structure on the surface residual stressdistribution was summed upThe simulation results showed that the resulting cutting forces and residual stresseswere accord with high-speed cutting theory, the chip shape was similar to the actualprocessing, it was indicated that the model of finite element simulation in this paper waseffective which could be used to study the cutting status during high-speed cutting oftitanium alloys, the simulation conclusion would provide important reference in the next research and the actual processing.