Laser Assisted Micro-turning Test Of TB8 Titanium Alloy And The Influence Rules Of Its Surface Quality

TB8 titanium alloy is a β-type titanium alloy,which belongs to high strength titanium alloy.TB8 titanium alloy is widely used in aerospace,shipbuilding,weapons and other fields because of its high strength and hardness and good corrosion resistance at high temperature.However,the high strength and hardness of TB8 titanium alloy also become the main factors hindering its cutting.When TB8 titanium alloy is processed by conventional cutting method,the cutting force is large and the tool wear speed is fast,which leads to low machining efficiency and poor cutting quality.In order to improve the machining efficiency and cutting quality of TB8 titanium alloy,the laser-assisted microturning of TB8 titanium alloy was studied in this paper.The research contents mainly include:Firstly,A set of laser-assisted micro-turning test system was designed independently,and the micro-turning device in the system was checked mechanically,and the steady state and mechanical properties of the system were analyzed by finite element method.Finally,the optimization and construction of the system are completed,which provides the equipment foundation for laser assisted microturning test.Secondly,the single factor test and orthogonal test of laser-assisted microturning were carried out with cutting force as the objective variable,and the influence level and optimal parameters of each cutting parameter on cutting force were analyzed.At the same time,the cutting forces of laser assisted micro-turning and conventional micro-turning were compared,and the influence rules of cutting parameters on cutting forces and tool wear were analyzed.Finally,the influence of cutting parameters on workpiece surface quality was studied,and the surface quality was analyzed according to the change of cutting force and tool wear during cutting.Finally,the relationship between surface roughness,residual stress and cutting parameters was established through multi-factor regression analysis of test data.According to the research in this paper,the laser-assisted microturning of TB8 titanium alloy can effectively reduce the cutting force and tool wear,reduce the surface adhesion of the workpiece,reduce the surface roughness value and residual stress,and then improve the surface integrity of the workpiece,which provides theoretical support for the machining of TB8 titanium alloy.