Effects of Cryo-Treatment on the Cut Qualities of Ti-6al-4v Eli Alloy During Wire-Edm Operation

Abstract

As the demands of high surface finish and machining of complex shape geometries is increasing day by day, conventional machining process is now getting replaced by non-conventional machining processes. Wire Electro Discharge Machining (WEDM) is one of the non-conventional machining processes which is used nowadays in the industries. WEDM technology is widely used in aerospace/aircraft, medical and mostly all areas of conductive material machining. Surface roughness, Metal removal rate, and kerf width are of utmost interest in the field of machining processes. This reporte valuates the effect of cryogenic treatment on Wire EDM Parameters of Titanium grade 23 alloy. The objective of this research work is to investigate the effect of cryo treatment on four process parameters including pulse on time, pulse off time, servo voltage, wire feed rate on process performance parameters such as cutting speed, Material removal rate, kerf width, and surface integrity. This paper summarizes the VIKOR method of optimization technique, in order to optimize the cutting parameters in Wire EDM for Ti-6Al-4V ELI. The objective of optimization is to get the minimum kerf width, maximum MRR and the best surface quality simultaneously and separately. In this present study stainless Titanium grade 23is used as a work piece, brass wire of 0.25mm diameter used as a tool. Dielectric fluid pressure, wire tension, wire speed and cutting length are taken as fixed parameters. Taguchi L27is used for Design of Experiment for Cryo-treated and untreated sample. For each experiment surface roughness, MRR and kerfwidth was determined. By using multi-objective optimization technique VIKOR method, the optimal setting of parameters is obtained for surface roughness, Metal removal rate and kerf width.. Additionally, the analysis of variance (ANOVA) is too useful to identify the most important factor. Simpleaxi symmetric 2DANSYSmodel for wire electric discharge machining (WEDM) is developed using the finite element method (FEM).