Machining mechanism and stress model in cutting Ti6Al4V

In the aircraft industry, Ti6Al4V is often used due to its good strength and excellent comprehensive performance. However, because of its particularity, the titanium alloy material itself makes the processing difficult. In the current research, the research on the force of machining, heat flow, and stress on machined surfaces produced when machining titanium alloy is not enough, especially for the residual stress has not been able to give a more accurate numerical solution. The main work of this essay includes the following: a planar orthogonal cutting model is established by finite element method (FEM), and the cutting mechanism is studied based on the established model. Combining previous work, the cutting temperature model was analyzed and the relationship between the distance from machined surface and residual temperature of the processed workpiece is discussed. Simulations are performed on the cutting temperature field under different processing conditions. Furthermore, on the basis of the model of cutting force and temperature, it was proposed that the residual stress versus depth curve can be an exponential function and a linear superposition of high-order Gaussian functions. This research has certain significance in revealing the mechanism of cutting force and residual stress formation in difficult-to-machine materials.