First-Principles Evaluations of Machinability Dependency on Powder Material in Elastic Emission Machining

Abstract

Machining mechanism of EEM (Elastic Emission Machining) is investigated at the atomic level by employing first-principles molecular-dynamics simulations. Based on experimental results it has been suggested that the removal of surface atom occurs through a surface chemical reaction between the work surface and the powder surface. This reaction has been so explained that powder particle chemisorbs on the work surface, and is succeedingly separated, removing a work-surface atom. In this paper, we investigate the machining mechanism by the analyses of the reaction process and the binding energy between work and powder surface based on the molecular-dynamics method. First, dependency of machinability on the powder materials is evaluated. It is recognized that the bond between the machined surface atom and the work surface is weakened, and the dependency on powder material is consistent with experimental results. Second, the molecular-dynamics analysis shows that the removal actually occurs in the unit of atom without any potential barrier and without introducing any defect around the machined atom.