Realization of Green Manufacturing Using Citric Acid Electrolyte for WC–Co Alloy Micro-tool Fabrication in Micro-WECM
This paper promotes green manufacturing by utilizing the environment-friendly electrolyte of citric acid for tungsten carbide alloy (WC–Co) micro-tool fabrication through micro-wire-electro chemical machining (WECM) process. The electrochemical dissolution behavior of WC–Co in different concentrations of citric acid has been investigated through open-circuit potentials and polarization curves obtained from cyclic voltammetry analysis. Response surface methodology(RSM) technique has been utilized to study the micro-WECM process characteristics and the influence of significant process parameters like electrolyte concentration, applied voltage, and reciprocating speed has been studied by analysis of variance (ANOVA). Moreover, optimization of machining parameters has been done through desirability function approach to maximize the MRR and the optimized values are found to be 0.25 M electrolyte concentration, 15 V applied voltage and 5.31 µm/s reciprocating speed. Finally, a confirmation experiment has been conducted to fabricate a micro-tool of 111.2 µm diameter in the citric acid electrolyte.