Sensitivity Analysis of the Influence of Milling Parameters on the Surface Residual Stress of Titanium Alloy TC11

In order to improve the surface integrity of titanium alloy, a mathematical model of residual stress in x and y direction is established by three factor and three level orthogonal test method. Based on this model, the influence of milling parameters on residual stress is analyzed by using the sensitivity analysis method. Test and analysis results show that the titanium alloy milling process, the residual stress increases with the increase of milling proecess parameters, but in x and y direction the degree of influence is different; The x direction residual stress on milling parameter sensitivity is higher than that of the residual stress in the y direction. x direction of surface residual stress is the most sensitive to change of the cutting speed and then is to the amount of feed per tooth, least sensitive to the cutting depth, y to the same conclusion.