Abstract:Aiming at the difficult machinability of a new higher strength titanium alloy TC21, the three dimensional (3D) finite element model (FEM) of turning process is established. The chip formation process was numerically simulated by the established model, and its physical data of changing curves of cutting forces and stress values were acquired. In addition, the effect of tool rake angle, feeding speed and rotational speed of spindle on the cutting process of titanium alloy TC21 were investigated by the cutting test. Under the same cutting conditions, the result of simulation was compared with that of the test, which verified its reliability. The test results prove that the chip in the turning of titanium alloy TC21 is serrated, and the serrated increased with the tool rake angle, and the shape of serrated is more obvious.