Study the Effect of Cryogenic Treatment in Electro-Discharge Machining on Material Removal Rate for Copper and Chromium Copper Electrode

EDM is an unconventional electro thermal machining process used for manufacturing geometrically complex or hard material parts that are extremely difficult-to-machine by conventional machining process. The process involves a controlled erosion of electrically conductive materials by the initiation of rapid and repetitive spark discharges between the tool and work piece separated by a small gap of about 0.01mm to 0.50mm. This gap is either flooded or immersed in a dielectric fluid. The controlled pulsing of direct current between the tool and the work piece produces the spark discharge. EDM researchers have explored a number of ways to improve the material removal rate with various experimental concepts. Despite a range of different approaches, every new research shares the same objectives of achieving high material removal rate with reduction in tool wear and improved surface quality. This paper presents the different tool condition with the same workpiece material vast array of research work carried out within past decades for the development of EDM. This study is mainly focused on aspects related to material removal rate which are the most important parameters from the point of view of selecting the relevant process parameters as well as different Tool material.