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Investigation on Plasma Temperature in EDM Process Through Optical Spectroscopy


Affiliations
1 Dept. of Mechanical Engineering, College of Engineering, Anna University, Chennai-600025, India
2 Centre for University, Industry Collaboration, Anna University, Chennai-600025, India
3 Dept. of Production Technology, Madras Institute of Technology, Anna University, Chennai-600044, India
     

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Material removal in the electrical discharge machining (EDM) is primarily due to a thermal mechanism. Therefore, the analysis of plasma in EDM is a crucial one to realize the concept of the machining. This work looks into the temperature measurement of the EDM plasma by using a newly designed optical system. The measuring system consists of an optical fiber positioned in the dielectric oil and spectrometers interfaced with charge coupled devices (CCDs). Spectral data of the plasma spark was analyzed by means of image-processing technique in-turn to measure the relative intensities of Fe I spectral lines emitted during the machining. The outcome of this study reveals that the temperature of the EDM plasma varies from 7965° K to 9680° K for a significant range of gap current.
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  • Investigation on Plasma Temperature in EDM Process Through Optical Spectroscopy

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Authors

J. Prasanna
Dept. of Mechanical Engineering, College of Engineering, Anna University, Chennai-600025, India
P. Mannar Jawahar
Centre for University, Industry Collaboration, Anna University, Chennai-600025, India
B. Mohan
Dept. of Production Technology, Madras Institute of Technology, Anna University, Chennai-600044, India

Abstract


Material removal in the electrical discharge machining (EDM) is primarily due to a thermal mechanism. Therefore, the analysis of plasma in EDM is a crucial one to realize the concept of the machining. This work looks into the temperature measurement of the EDM plasma by using a newly designed optical system. The measuring system consists of an optical fiber positioned in the dielectric oil and spectrometers interfaced with charge coupled devices (CCDs). Spectral data of the plasma spark was analyzed by means of image-processing technique in-turn to measure the relative intensities of Fe I spectral lines emitted during the machining. The outcome of this study reveals that the temperature of the EDM plasma varies from 7965° K to 9680° K for a significant range of gap current.