ABSTRACT : |
Electric Discharge Drilling (EDD) is a spark erosion machining process used to produce micro holes in those materials which are electrically conductive. Materials science have developed many high strength and temperature resistant (HSTR) metal alloys that are difficult to machine by the conventional machining. In this study Aluminium alloy 6061 (50*75*6) mm is used as workpiece and drilling is done with hollow copper electrode as tool. Machining parameters such as Peak current, pulse ontime, pulse off-time, tool polarity, and duty cycle’s effects were observed on the metal removal rate. Experiments were planned based on L18orthogonal array by Taguchi method of Design of experiments. Micro holes and micro-grinding are profusely used in the aviation, automobile and medical industry.
Keywords: Electric Discharge Drilling (EDD); Pulse om-time; Pulse off-time; Metal removal rate (MRR); Tool polarity; Aluminium Alloy 6061; Di-electric |
|