Effect of peak current on material removal rate for electrical discharge machining of non-conductive Al2O3 ceramic

Moudood, M. A. and Sabur, A. and Ali, Mohammad Yeakub and Jaafar, Israd Hakim (2014) Effect of peak current on material removal rate for electrical discharge machining of non-conductive Al2O3 ceramic. Advanced Materials Research, 845. pp. 730-734. ISSN 1022-6680

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Abstract

Electrical discharge machining (EDM) is a non-conventional machining process where materials are removed by the thermal energy exerted from series of electrical sparks. This process is applied for machining of non-conductive alumina (Al2O3). The workpiece is covered with the adhesive copper foil to initiate the initial spark between the workpiece and the tool electrode. A pyrolytic carbon (PyC) layer is generated on workpiece surface by dissociating kerosene dielectric after the machining of initial copper assisting electrode (AE) layer. In this study, experiments were performed by varying the peak current and keeping other parameters constant in order to investigate the effect of peak current on material removal rate (MRR) in EDM of Al2O3. The results showed that the lowest and the highest values of peak current were 1.1 A and 1.3 A, respectively. Material cannot be removed due to insufficient PyC layer generation for any values of peak current less than 1.1 A or more than 1.3 A. From the results, it is also observed that the MRR is increased when higher peak current values are used. MRR was found to be 0.052 mm3/min at peak current 1.1 A and it was found to be 0.132 mm3/min at peak current 1.3 A.

Item Type:	Article (Journal)
Additional Information:	4751/35539
Uncontrolled Keywords:	Non-conductive ceramic; Electrical discharge machining; Assisting electrode, Conductive layer; Peak current; Material removal rate
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TS Manufactures
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Prof. Ir. Dr. Mohammad Yeakub Ali
Date Deposited:	10 Feb 2014 11:06
Last Modified:	19 Sep 2017 11:01
URI:	http://irep.iium.edu.my/id/eprint/35539

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