Molecular dynamics analysis on microstructure of diamond-turned surfaces

摘要

Abstract: By the use of molecular dynamics computer simulation, a feasibility study is made for the quest of ultimate quality of machined surface attainable in diamond microturning of copper and aluminum with a fine cutting edge under hypothetically perfect machine motion. Based on the analyses, the surface generation process and microstructure of worksurface are well understood from atomistic point of view. In cutting of monocrystalline copper, the worksurface which has nearly perfect lattice structure can be obtained and ultimate surface roughness is estimated to be less than 1 nm. The quality of worksurface of aluminum is worse than that of copper, especially machined by the cutting edge with large radius. In cutting of polycrystalline copper, nanometric distorted layer inevitably remains on worksurface. However, the ultimate surface roughness is estimated to be at the same level as that of monocrystalline copper.!9