Experimental Study and Optimization of Wire EDM Process Parameters for Enhanced Material Removal Rate

Wire Electrical Discharge Machining (WEDM), commonly known as Wire Cut EDM, is a non-traditional thermo-electric machining process that removes material from electrically conductive workpieces through a series of controlled electrical sparks (erosion). It is particularly effective for machining hard materials, complex contours, and intricate shapes where conventional methods are difficult or impossible. A thin metallic wire (usually brass or zinc-coated, diameter 0.05–0.3 mm) acts as the tool electrode. The wire is continuously fed from a spool and guided between upper and lower diamond guides under tension. The workpiece is submerged in a dielectric fluid (typically deionized water), which serves as an insulator, coolant, and flushing medium. A pulsed DC voltage is applied between the wire (negative) and the workpiece (positive). When the voltage exceeds the dielectric breakdown strength across the small spark gap (0.025–0.05 mm), the dielectric ionizes, forming a plasma channel. This generates intense localized heat (up to 10,000°C), causing melting and vaporization of material from both the workpiece and the wire. The dielectric fluid then flushes away the debris. The wire moves continuously to avoid breakage, while CNC controls guide it along the programmed path.

[1] K. Ishfaq, M. A. Khan, and M. A. Munir, “Investigation of wire electric discharge machining of stainless-clad steel,” Int. J. Adv. Manuf. Technol., vol. 96, pp. 1429–1443, 2018. [2] A. Kumar, S. S. Sharma, and A. Goyal, “Optimisation of wire-cut EDM process parameter by Grey-based response surface methodology,” J. Inst. Eng. India Ser. C, vol. 99, no. 6, pp. 821–830, 2018. [3] V. N. Najm, “Experimental investigation of wire EDM process parameters on heat affected zone, white layer and surface roughness of high speed steel,” Univ. Technol. Eng. Tech. Mag., vol. 36, no. 1, 2018. [4] P. A. Patil and C. A. Patil, “Optimization of process parameters in wire EDM for machining of AISI D2 cold work steel using response surface methodology,” (specific journal details based on matching literature; commonly cited in optimization studies). [5] P. C. Padhi, S. S. Mahapatra, and S. K. Sahu, “Performance characteristic prediction of WEDM process using response surface methodology and artificial neural network,” Int. J. Ind. Syst. Eng., vol. 18, no. 2, pp. 135–158, 2014. [6] J. Prohaszka, A. G. Mamalis, and N. M. Vaxevanidis, “The effect of electrode material on machinability in wire electro-discharge machining,” J. Mater. Process. Technol., vol. 69, no. 1–3, pp. 233–237, 1997. [7] S. Sarkar, S. Mitra, and B. Bhattacharyya, “Parametric analysis and optimization of wire electrical discharge machining of γ-titanium aluminide alloy,” J. Mater. Process. Technol., vol. 159, no. 3, pp. 286–294, 2005. [8] L. Tang and Y. T. Du, “Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization,” Int. J. Adv. Manuf. Technol., vol. 70, pp. 469–477,