Modelling of residual stress as a function of temperature in EDM

Abstract

Innovative developments have prompted an expanding utilization of high quality, high hardness materials in manufacturing industries. While machining of these materials, conventional manufacturing methods are progressively being supplanted by more exceptional strategies, for example, electro-discharge machining (EDM), electric chemical machining (ECM) ,ultrasonic machining (USM), and laser machining. EDM displaces materials by dissolving and vaporizing brought about by the high heat inside the discharging column. EDM includes the complex involvement of numerous physical phenomena. Electric spark between the cathode and anode produces a lot of heat over a little region of the work-piece. This work is intended on analysing the residual stresses caused in EDM process as a function of temperature. A model based on the Stablein’s relationship/equation is found, which is a relationship of residual stress with respect to depth of the workpiece. Then a model is proposed of depth as a function of temperature. Through the statistical analysis an empirical relation is found between the latter and it is used in the former equation.