Effect of step pulse waveform in electrochemical micromachining for dimension control
DOI:
https://doi.org/10.58368/MTT.22.5.2023.13-17Keywords:
Electrochemical Micromachining, Step Pulse Waveform, Dimension Control, Potential Transmission, Stray CurrentAbstract
Electrochemical micromachining is becoming a popular technique for structuring ultra-precision micro-components. Incorporating the discharging effect of double layer capacitor during faradic time of step pulse waveform, potential transmission has been controlled during machining. In addition, by applying another technique of dimension control, stray current effects have been minimised significantly, which is clearly understood from simulation and polarization results. As a result, electrolyte potential and current density have been minimised by 23% and 63%, respectively. Thus, at the voltage of 14V, 51.49% of overcut reduction has also been obtained as compared to non-coated workpieces. For coated workpieces, the transpassive state appears quickly which can remove the obstacle of current flow during the passive state. From machined microholes images, it has been observed that edges are uniform, pitting effects are negligible, sidewalls are smooth and profiles of microholes are almost circular.
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