Abstract:A nanometric cutting model of titanium was built based on the basic principles of molecular dynamics (MD) method. EAM (embedded atom method) and Morse potential function were used, respectively, to compute the interactions between atoms. Effects and variations of different cutting edge radius and tool rake angle on surface morphology, system potential energy, cutting force and temperature of titanium workpiece in nanometric cutting process were analyzed. Results show that: When cutting with a bigger cutting edge radius, roughness of machined surface gets increased and the size of cutting force, temperature of workpiece and volume of chips will be decreased. Titanium atoms are suffered by compressive stress and shear stress when cutting with negative and positive rake angle, respectively. Positive rake angle is more conducive to cutting, and the sizes of tangential force and normal force also have significant changes under different tool rake angle.