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ABSTRACT
Re-solidified layer of molten metal during laser trepan drilling of Inconel-718 is a serious concern. Re-solidification affects the dimensional stability and geometrical features. Many scientific efforts have been reported for understanding and minimising the re-solidification layer (recast layer) thickness in laser cutting and percussion drilling operations. However till date, limited scientific work has been reported concerning recast layer formation during the laser trepanning of Inconel-718. In the present work, a methodology has been proposed for reducing the recast layer formation during the laser trepanning of Inconel-718. For understanding and achieving minimum recast layer thickness with better circularity, series of laser trepanning experiments have been performed on a thin sheet of Inconel-718. Recast layer thickness and hole- circularity are measured for each laser trepan drilled hole followed by the development of mathematical models using response surface methodology. The developed mathematical models are optimised with the help of multi-objective genetic algorithm to ascertain the optimum trepan drilling parameters. The obtained values of optimum parameters are validated by conducting more experiments. From validation experiments, it has been found that the obtained range of input parameters is significant, and the heat affected zone can be controlled using the proposed methodology.
Disclosure statement
No potential conflict of interest was reported by the authors.
Additional information
Notes on contributors
Kedari Lal Dhaker
Mr. Kedari Lal Dhaker pursued his Bachelor of Engineering (B. E.) in Mechanical from M.I.T.S. - Gwalior (Government Aided Autonomous Institute of Madhya Pradesh) - in the year of 2006. In the year of 2008, he has completed Post Graduation in Production Engineering from Delhi College of Engineering (DCE, Delhi University), now Delhi Technological University (DTU). After completion of Post Graduation, he has joined the TATA CONSULTING ENGINEERS LTD (TCE) as trainee Engineer-Mechanical. Mr. DHAKER has served the TCE for the 5 years and left the company as Senior Engineer-Mechanical. Having 5 years of Industrial experience at steel plant project engineering & equipment design and 5 years of academic & teaching at JUET. Currently working in University as Assistant Professor (G-ii)-Mechanical.
Bhagat Singh
Dr. Bhagat Singh has done his graduation in Mechanical Engineering from NIT, Kurukshetra. He obtained his Master of Engineering from NIT, Rourkela in Mechanical Engineering. His specialization in M.Tech was Machine Design and Vibration Analysis. He was awarded Ph.D. degree from NIT, Rourkela. The title of his Ph.D. dissertation was -Study of damping in layered and welded beams.” Dr. Singh has 17 years of teaching and research experience. He has published 44 papers in peer-reviewed international journals and conferences proceedings.
Yogesh Shrivastava
Dr. Shrivastava has a result-oriented profile with more than 2 dozens of research papers in various journals of repute. Dr. Shrivastava has completed his Ph.D. in 2019 with a specialization in manufacturing technology and has research interest in Fault diagnosis in machinery using signal processing techniques, Unconventional machining of advanced materials, Fabrication of fiber reinforced Composite. He has reviewed many articles that are published in renowned journals. Currently, he is working as an Assistant Professor & Research Coordinator in the Department of Mechanical Engineering at Galgotias College of Engineering and Technology, Greater Noid, U.P., India.