Nonihal Singh Dhakry et al Int. Journal of Engineering Research and Applications www.ijera.com ISSN : 2248-9622, Vol. 4, Issue 2( Version 1), February 2014, pp.661-669 www.ijera.com 1 | Page Analysis of process parametersin electro-discharge machining of Tungsten carbideby using taguchi Nonihal Singh Dhakry,* Prof. Ajay Bangar, **Gaurav Bhadauria, *** *Student of M.E. (PIS), Mechanical Engineering Department, Maharana Pratap College of Technology, Gwalior, Madhya Pradesh ** H.O.D. (Mechanical Engineering Department) M.P.C.T. Collage. ***Ph.D. research scholar, BIT Sindri (Dhanbah) Abstract – In this paper, tries have been made optimize process parameters in Electro-Discharge Machining (EDM) of tungsten carbide (WC/CO) using copper electrodes to development machining mode based on taguchi techniques. Four independent input parameters discharge current (Amp), pulse-on time (μs), duty cycle (%), and gap voltage (Volt) were selected to assess the EDM process performance in terms of material removal rate (MRR: g/min) has been used to design and examine the experiments. For each process response, a suitable second order decline equation was set up applying analysis of variance (ANOVA) and student t-test procedure to check modeling goodness of fit and select proper forms of influentially significant process variables (main, two-way interaction). The MRR increases by selecting higher discharge current and higher duty cycle which capitals providing greater amounts of discharge energy inside gap region. In this paper we conduct the experiment on maximum possible combination of process parameter (Discharge current, Pulse-on time, Duty cycle,Gap voltage) developed by taguchi method and find a set of optimal input parameters with maximum nearby MRR during ED Machining of WC/Co(tungsten carbide-cobalt composite) material. Keywords: Electro-Discharge Machining (EDM); Design of Experiments (DOE); taguchi, Anova, I. INTRODUCTION The history of electro-discharge machining (EDM) dates back to the days of World Wars I and II when B. R. and N. I. Lazarenko invented the relaxation circuit (RC). Using a simple servo controller they maintained the gap width between the tool and the workpiece, reduced arcing, and made EDM more profitable. Since 1940, die sinking by EDM has been refined using pulse generators, planetary and orbital motion techniques, computer numerical control (CNC), and the adaptive control systems. During the 1960s the extensive research led the progress of EDM when numerous problems related to mathematical modeling were tackled. The evolution of wire EDM in the 1970s was due to the powerful generators, new wire tool electrodes, improved machine intelligence, and better flushing. Recently, the machining speed has gone up by 20 times, which has decreased machining costs by at least 30 percent . 1.1 Need OF EDM In recent years, materials with unique metallurgical properties – such as tungsten carbide and its composites, titanium based alloys, nickel based alloys, tool steels, stainless steels, hardened steels and other super alloys – have been developed to meet the demands of extreme applications. While these materials are harder, tougher, less heat sensitive and/or more resistant to corrosion and fatigue, they are more difficult to machine. Difficult-to-cut materials have been widely used these days not only in the aerospace industry but also in the public welfare industry. Therefore, the machining of difficult-to-cut materials is an important issue in the field of manufacturing. Since these difficult-to-cut materials possess excel- lent mechanical properties which can be useful in many important applications, machining of them can open up opportunities of utilizing them comprehensively 1.2 ELECTRICAL DISCHARGE MACHINING Electrical discharge machining (EDM) is a thermal process with a complex metal-removal mechanism, involving the formation of a plasma channel between the tool and work piece. It has proved especially valuable in the machining of super- tough, electrically conductive materials such as the new space-age alloys that are difficult to machine by conventional methods [Kunieda et al.]. The word unconventional is used in sense that the metal like tungsten, hardened stainless steel tantalum, some high strength steel alloys etc. are such that they can„t RESEARCH ARTICLE OPEN ACCESS