Abstract
This work’s main objective is to determine the optimum process parameters in the electrohydraulic forming (EHF) of austenitic stainless steel AISI 304 of 0.25 mm thickness for macro and micro shape. A truncated cone with grooves in the apex is considered as macro-micro shape. The response surface methodology (RSM) was developed for process variables such as voltage and standoff distance to determine the optimum parameters. To validate the model, confirmation experiments have been conducted, i. e. for the optimum value of voltage (V) = 8.935 kV and standoff distance (SOD) = 40.60 mm, and from the experiments the forming depth predicted is 9.221 mm and depth from the experiments is 9.5 mm. The percentage deviation from the predicted and experimental forming depth is 3.025 %, an acceptable range of less than 5 % for the surface roughness, the predicted value is 0.2598 microns, and the experimentally measured value is 0.268. The percentage deviation is 3.156 % between the predicted and experimental values, an acceptable range of less than 5 %. This shows that the model is suitable for predicting both responses. The validation experiments also found that the sheet fills one of the grooves and partially fills the other, which shows the capability of the electrohydraulic forming process. Confirmation experiments have been conducted.
About the authors
Balasubramanian Arunprasath, born in 1978, received his BEng. in Mechanical Engineering from Mepco Schlenk Engineering College, Sivakasi, TamilNadu and his MEng. in Computer-Aided Design from the College of Engineering, Guindy, Anna University, Chennai, India. He is pursuing his PhD in electrohydraulic forming at the Madras Institute of Technology, Chrompet, Anna University, Chennai, India, under Dr. Pasupathy Ganesh’s supervision. He has ten years of teaching experience.
Dr Pasupathy Ganesh, born in 1979, received his PhD in the area of Metal Forming from Anna University, Chennai in 2013. He is currently working as an Assistant Professor in the Department of Production Technology at the Madras Institute of Technology, Chrompet, Chennai, India.
Dr Karibeeran Shanmuga Sundaram, born in 1975, received his PhD in Fracture Mechanics from Anna University, Chennai in 2005. He is currently working as a Professor in the Engineering Design Division at the Department of Mechanical Engineering, College of Engineering Guindy, Anna University Chennai, India.
Acknowledgement
The authors acknowledge Mr C. Bhavani Shankar, a former scientist at IGCAR Kalpakkam and Managing Director of Magpulse Technologies Pvt Ltd, Magnetic Pulse Joining, Forming and Automation, Bengaluru, Karnataka, India, for allowing to conduct the experiments.
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