| || Electrochemical Discharge Machining Non Conducting Ceramics
Author : Sorkhel, S.K. ;Bhattacharyya, B.;Doloi, B.
Source : Defence Science Journal ; Vol:49(4) ; 1999 ; pp 331-338
Subject : 620.1 Material Science and Technology
Keywords : Non conducting zirconium oxides ;ECDM process;ANOVA analyses;Signal to noise (SIN) ratio;Parametric optimisation
Abstract : The electrochemical discharge machining (ECDM) process is mostly applied for machining non- conducting engineering ceramic materials, such as aluminium oxides, zirconium oxides, and silicon nitrides, etc. Experiments on ECDM have been carried out according to designed experimental plan based on standard orthogonal array (L9) to identify the optical parametric conditions of ECDM process using Taguchi method of parametric optimisation. In this study, the signal-to-noise (SIN) ratio land the ANOVA analyses are employed to find the relative contributions of the main machining parameters, such as applied voltage, electrolyte concentration and interelectrode gap in controlling the machining performance, such as material removal rate and radial overcut of the ECDM process. The confirmation of experimental results under optimal parametric condition are provided to ensure the improvement in quality characteristics of the ECDM process. The highly purified non-conducting zirconium oxide is used as workpiece material and aqueous KOH in stagnant condition as electrolyte with three different concentrations (i.e., 15 per cent, 25 per cent and 20 per cent). The applied voltage of pulsed d.c. power supply has three levels of 50 V, 60 V and 70 V and the three different inter-electrode gap setting considered for the experiments are 20mm, 30mm and 40mm respectively.