Abstract
An experiment is conducted to study about plasma characteristics in a micro-EDM process. The tool is provided with ultrasonic vibration of varying amplitude and frequency using a piezoelectric actuator. The material removal takes place due to the heat generated by a plasma formed between tool and workpiece electrodes. The plasma formed is assumed to be in a local thermodynamic equilibrium and the electron velocity distribution is assumed to be Maxwellian. Therefore, spatial and temporal variations are not considered in this study. This plasma lasts only for a few microseconds which makes direct temperature measurement quite challenging. Optical emission spectroscopy is used to record the intensity of light emitted by various elements in the plasma. Boltzmann line pair method is used to calculate the temperature, and Full Width Half Maximum (FWHM) spectral line is used to calculate electron density, which describes the characteristics of the plasma. Plasma temperature varies between 7000 and 12000 K. Average electron density is 7.87765E + 16 cm−3.
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Varghese, L., George, J., Manesh, K.K. (2023). Plasma Characterization in Ultrasonic Vibration-Assisted Micro-Electrical Discharge Machining (µ-EDM). In: Bhattacharyya, B., Mathew, J., Saravanakumar, N., Rajeshkumar, G. (eds) Advances in Micro and Nano Manufacturing and Surface Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-4571-7_2
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DOI: https://doi.org/10.1007/978-981-19-4571-7_2
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