Abstract
This experimental work is an attempt to investigate the performance of Copper electrode when EDM of Nickel Based Super Alloy, Inconel 718 is at higher peak current and pulse duration. Peak current, Ip and pulse duration (pulse on-time), ton are selected as the most important electrical pulse parameters. In addition, their influence on material removal rate (MRR), electrode wear rate (EWR), and surface roughness (Ra) are experimentally investigated. The ranges of 10 mm diameter of Copper electrode are used to EDM of Inconel 718. After the experiments, MRR, EWR, and Ra of the machined surfaces need to be measured in order to evaluate the performance of the EDM process. In order to obtain high MRR, higher peak current in range of 20A to 40A and pulse duration in range of 200μs to 400μs were used. Experimental results have shown that machining at a highest peak current used of 40A and the lowest pulse duration of 200μs used for the experiment yields the highest material removal rate (MRR) with value 34.94 mm3/min, whereas machining at a peak current of 20A and pulse duration of 400μs yields the lowest electrode wear rate (EWR) with value −0.0101 mm3/min. The lowest surface roughness (Ra) is 8.53 μm achieved at a lowest peak current used of 20A and pulse duration of 200μs.
Highlights
Nickel based super alloy, Inconel 718 is one of the most difficult-to-machine material which attributed to its ability to maintain hardness at elevated temperature and it’s very useful for hot working environment
Peak current and pulse duration against material removal rate (MRR) The effect of peak current and pulse durations on the MRR is shown in figure 2
An increased in peak current MRR increase for all setting of pulse duration
Summary
Series: Materials Science and Engineering 50 (2013) 012062 doi:10.1088/1757-899X/50/1/012062. Electrical discharge machining (EDM) of Inconel 718 by using copper electrode at higher peak current and pulse duration. S Ahmada and M A Lajisb Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Batu Pahat, Johor, Malaysia
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