Three-dimensional Analysis of Melting Layer in EDM

A primary factor of processing mechanism about electrical discharge machining is the vaporizing and melting action of material (electrode and workpiece) near a discharging point and the dynamical action necessary for that melted part is scattered and removed on basis of discharging in liquid.The analysis of thermal action on discharging part was not considered up to now that thermal physical constant of material which is the basis of the analysis changes depending on the temperatur and a part of melted layer remain. The real state of thermal action was not understood clearly by the analysis of two dimensions.In this report, the dependence of thermal physical constant of material on temperature and residual melted layer are considered, then the analysis of three dimensions is carried out by using finite element method. The temperature distribution relating to generation of thermal stress is analizing together with that the real state of vaporizing and melting in electrical dischage machining part are made clear.