Investigation of machined surface quality about single crystal with vacancy by molecular dynamics simulation

Although people have already carried out many meaningful research about tool materials and structure, machining technique parameters, machined surface quality, there is little effort about physical essence of cutting process, micro-mechanism of structure property, hardening and destroy. In the case of computer simulation ultraprecision manufacturing technology (UMT), the materials are always assumed to be defect free, which is different from reality. In this paper, the author employed molecular dynamics (MD) method to study the surface integrity of machined single crystal materials with vacancy, the simulation results shows that the cutting force of machining ideal crystal materials is ten times that of machining with microstructure crystal materials, which explains the phenomenon that microstructure degrade the strength of crystal