1M. Tech. student from Galaxy Global Group of Institutions (GGGI), Dinarpur, Ambala, Haryana
2Assistant Professor working in Galaxy Global Group of Institutions (GGGI), Dinarpur, Ambala, Haryana
3Assisitant Professor working in Swami Devi Dyal Institute Of Engg. & Technology (SDDIET), Barwala, Haryan
Online published on 19 April, 2019.
Electrical discharge machining is a non conventional process of machining very hard material such as titanium alloys, heat treated tool steels, super alloys, composites, ceramics, heat resistant steels, tungsten carbides etc. These materials are precise and very difficult to machine with conventional way of machining processes like milling, drilling etc. These hard materials are widely used in modern industries (die and mold making industries, medical, aerospace, aeronautics and nuclear industries). Electric discharge machining is a thermal based machining process in which machining is done with the repeatedly reoccurring electric sparks occurs between the tool and work piece. Both the tool and work piece are immersed in dielectric fluid.
This study discusses the influence of machining parameters like current, voltage, pulse on time and pulse off time on the performance parameters such as material removal rate and tool wear rate. These selected machining parameters are varied up to their four levels. The other machining parameters such as duty cycle, polarity, spark gap are kept constant. Since mild steel is an electric conductive material and found applications in various industries for making desirable products, so in this experiment mild steel is used as a work piece material and machining is done with copper electrode having 10 mm in diameter. The layout of design of experiment is based on Taguchi L16 orthogonal array and analysis of variance (ANOVA) is used to investigate the results obtained from Taguchi. From results it is concluded that out of four selected machining parameters, current and pulse on time are the most influencing parameter for material removal rate and the other two parameters i.e. voltage and pulse off time have not much effect on performance. As the current and pulse on time increases, the material removal rate also increases. From the response tables for means and S/N ratio for material removal rate, it is found that current is the most impacting parameter followed by pulse on time, voltage and pulse off time.
