Reason-A Technical Journal (Formerly Reason-A Technical Magazine)

S. Biswas ¹, B. R. Sarkar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Abstract

Manufacturing of the better quality ceramic products with more accuracy and precision is a great challenge in the current industrial field. Electrically non-conducting materials like ceramics, composites, alumina, glass etc can be machined easily using Electrochemical Discharge Machining (ECDM) process. The performance characteristics of ECDM process e.g. material removal rate (MRR), machining depth rate (MDR), radial overcut (ROC) and heat affected zone (HAZ) are influenced by various process parameters such as applied voltage, inter-electrode gap, temperature, concentration of the electrolyte, type of electrolyte, shape, size and material of the electrode and also the nature of the power supply etc. This paper presents the optimization of m-EDMing of Silicon Nitride by utilizing Multi-Objective Optimization by Ratio Analysis (MOORA). Also, a multi choice decision analysis i.e. Analytic Hierarchy Process (AHP) is applied for optimization.

Keywords

μ-ECDM, MRR, MDR, ROC, HAZ, MOORA.

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B. Mallick ¹, B. R. Sarkar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Abstract

Travelling Wire Electrochemical Discharge Machining (TW-ECDM) process is a special type of Electrochemical Spark Machining (ECSM) process which has a greater effectiveness for machining of electrically non-conducting material like hylam based fiber reinforced plastics (FRP). The recent research paper focuses the parametric analysis on machining criteria such as material removal rate (MRR) and Overcut (OC) for slot cutting operation considering applied voltage, electrolyte concentration, feed rate of wire and pulse on time etc as process parameters. This paper shows the single and multi-objective optimization for determining the optimal parametric combination of TWECDM for maximum MRR and minimum OC based on response surface methodology (RSM). From the parametric analyses it is concluded that applied voltage has more significant effects on MRR and OC during TW-ECDM slot cutting operation.

Keywords

TW-ECDM, ECSM, MRR, OC, RSM.

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Josephine Peter ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Abstract

Nd: YAG Laser marking is flexible, programmable and environmentally clean process, which can indelibly mark at very fast speeds. The present paper deals with the analysis of laser marking process parameters like lamp current, laser scanning speed, pulse frequency of laser beam using Nd: YAG laser on various laser marking characteristics like the mark width, mark depth and mark intensity are studied during pulsed Nd: YAG laser marking on aluminium. The present study shows that high pulse frequency and lamp current with low scanning speed has more effect to achieve the minimum mark width, maximum mark depth. Also high pulse frequency and scanning speed has more effect on the mark intensity. In addition to it, analysis based on optical photographs has also been performed.

Keywords

Pulsed Laser, Nd: Yag Laser, Laser Marking, Mark Width, Mark Depth.

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