Laser Machining of Die Steel (EN-31): An Experimental Approach to Optimise Process Parameters using Response Surface Methodology

  • A. R. Patel Chandubhai S Patel Institute of Technology, CHARUSAT, Changa, Gujarat, India – 388421
  • S. N. Bhavsar Mechatronics Department, G H Patel College of Engineering and Technology, Vallabh Vidyanagar, Gujarat, India -388120
Keywords: Laser machining; Optimisation; RSM; Surface roughness; HAZ

Abstract

Experiments were performed based on response surface methodology (RSM) to investigate the process parameters effect on the features of hole geometry. Cutting speed (of 500-1000 mm/min), laser power (of 2000-4000 W), frequency (of 800-2000 Hz), duty cycle (of 75-95%), and gas pressure (of 0.05-0.15 bar) were considered as variable parameters. Deviation in the dimension of entrance and exit holes, heat affected zone (HAZ) on the upper & lower edge, and roughness were the output to analyse the cutting quality of 14 mm thick normal and heat-treated (HT) EN-31 die steel using 4 kW CO2 laser. For untreated plate, minimum taper angle was achieved with low cutting speed, higher laser power, and gas pressure. Higher cutting speed, low laser power, and higher gas pressure result in the minimum HAZ. For the HT plate, the mid-range of parameters results in the minimum taper angle and HAZ. An optimised model was developed, and the confirmatory test gives roughness up to 0.27 microns and it shows good agreement with the mathematical model. At the cross-section of holes, striation pattern, resolidified layer, and corner qualities were visually inspected. Surface damage near the cutting edge was observed using scanning electron microscopy.

Author Biography

S. N. Bhavsar, Mechatronics Department, G H Patel College of Engineering and Technology, Vallabh Vidyanagar, Gujarat, India -388120

Dr. Sanket N. Bhavsar (BE-Birla Vishvakaram Mahavidyalaya; MTech-IITMadras; PhD-IITDelhi)
Prof & Head, Mechatronics Department (NBA Accredited - 2015-2018 & 2018-2021)
G H Patel College of Engineering & Technology
Vallabh Vidyanagar-388120, Anand, Gujarat, India
College Website: www.gcet.ac.in

Published
2021-03-05
How to Cite
Patel, A., & Bhavsar, S. (2021). Laser Machining of Die Steel (EN-31): An Experimental Approach to Optimise Process Parameters using Response Surface Methodology. International Journal of Automotive and Mechanical Engineering, 18(1), 8563 -. https://doi.org/10.15282/ijame.18.1.2021.15.0650
Section
Articles