Investigations on Electric Discharge Machining Behaviour of Si 3 N 4 -TiN Ceramic Composite
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ORIGINAL PAPER
Investigations on Electric Discharge Machining Behaviour of Si3N4 -TiN Ceramic Composite C. Murugan 1 & R. M. Satheesh Kumar 2 & S. V. Alagarsamy 3 Received: 21 September 2020 / Accepted: 17 November 2020 # Springer Nature B.V. 2020
Abstract Ceramic composites are deliberated as an important material for their increasing advantages in aircraft, automotive and nuclear industries. But, these composites are very difficult to cut by conventional machining. Hence, the unconventional machining process like electric discharge machining (EDM) is reflected to be an essential machine for its capability to machine at any type of materials irrespective of its natural behaviour. In the present work is, to investigate the effects of EDM parameters on Si3N4-TiN ceramic composite by using taper shape of copper electrode. An L9 orthogonal array experimental plan is utilized to machining the composite by considering three input factors like pulse current, pulse on-time and pulse off-time. The material removal rate (MRR), over cut (OC) and taper ratio (TR) are considered as the machining performance characteristics. Taguchi combined with grey relational analysis (GRA) are employed to determine the best combination of EDM factors on multiple responses. An experimental result shows that, the optimal combination of parameters found to be pulse current at level 2 (1.0 amps), pulse ontime at level 1 (3 μs) and pulse off-time at level 2 (4 μs). ANOVA results noticed that pulse current is atmost impact parameter with influence of 65.47% subsequently by pulse on-time with contribution of 21.12% respectively. Finally, the confirmation test was conducted to validate the experimental results by using the optimized parameters. Keywords Si3N4-TiN . EDM . Taguchi method . Grey relational analysis . ANOVA
1 Introduction In recent decades, the need for products containing complicated features has revealed a prominent and balanced development. In fact, very small size of holes are employed for numerous resolutions in a number of products, such as diesel fuel injection nozzles, cooling channel in turbine blades, spinner holes, drug delivery orifices and inkjet printer nozzles [1]. EDM is a well-known precision machining process which can make the small holes in the hard materials as it is a non-
* C. Murugan [email protected] 1
Department of Mechanical Engineering, Pandian Saraswathi Yadav Engineering College, Sivagangai, Tamil Nadu 630 561, India
2
Department of Automobile Engineering, K.L.N College of Engineering, Sivagangai, Tamil Nadu 624 615, India
3
Department of Mechanical Engineering, Mahath Amma Institute of Engineering and Technology, Pudukkottai, Tamil Nadu 622 101, India
contact material removal process [2]. The main demerits of this method is it gives low MRR, poor surface finish and poor geometry quality. In the past research, various techniques were adopted to rectify these drawbacks by using dielectric fluid mixed with powder, rotation methodology, vibration aided machining, debris flushing techniques etc. [3]
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