Analysis of Structural Changes in the Parts Surface after Electrical Discharge Machining

Abstract

In modern engineering EDM technology finds wide application. It was found that the
processes accompanying electrical discharge machining, determined by physics of interaction of the material with concentrated energy flux initiated by spark discharge. Due to the fact that the surface layer of the workpiece material is subjected to intense thermal stresses on its surface to form secondary structures. Currently not fully explored the formation of secondary structures in materials with different physical and mechanical properties on the surface hardening by means of laser welding and hardening. Relevant is the question of conservation and hardened surface layers deposited their properties after processing them by wire-wire electric discharge cutting. It is proved that when machining hardened and weld surfaces is first necessary to ensure a minimum temperature heating parts. Excessive temperatures can reduce the received physical and mechanical properties of the hardened surface layer, which is not acceptable. The aim is to study the influence of modes PVEEO the occurrence of changes in the surface layer of machined parts. In this paper an experimental study of the processing of materials with different mechanical and physical properties. The features of the formation of the modified layer on the machined parts, depending on the cutting conditions. It is established that during the wire-wire electric discharge machining test specimens with increasing current on the treated surface is altered increasing the thickness of the surface layer, wherein the microhardness of the layer is not changed. It is shown that the formed layer does not affect the performance of the treated parts.