Abstract: In order to investigate the micro-mechanism of tool wear, nanometric cutting single crystal aluminum with diamond tool is analized by using molecular dynamics simulation method. The simulation results show that the number of chemical bond increases with increasing of depth of cut and intensify tool diffusion wear, while crystal orientation has little effect upon tool wear, the build-up edge induced by diffusion wear acts as cutting tool, degrades the machined surface quality and raises temperature which intensify tool wear inversely.

Key words: Build-up edge, Diffusion wear, Molecular dynamics, Nanometric machining