3-DIMENSIONAL MOLECULAR-DYNAMICS SIMULATION OF ATOMIC-SCALE PRECISIONPROCESSING USING A PIN TOOL

This paper describes the effect of temperature and interatomic force b etween a workpiece and tool on the atomic-scale cutting mechanism, by means of molecular dynamics simulation. The interatomic force between the workpiece and tool is assumed to be derived from the Morse potenti al function. Molecular dynamics cutting simulations were carried out u sing a rigid pin tool, with changing of the temperature and the value of Morse potential parameters gamma(0), D and alpha. The increase in t he potential parameters D and alpha resulted in the positive effect of surface roughness, but the increase in the parameter gamma(0) and tem perature resulted in the negative effect of surface roughness. Chip fo rmation and side flow resulted due to the collision between the workpi ece and tool, which lead to a temperature increase of the workpiece. T he surface of workpieces observed experimentally in micro-scale cuttin g was similar to that in atomic-scale cutting by molecular dynamics si mulation.