Application of Superiority and Inferiority Multi-criteria Ranking Method for Parametric Optimization of Laser Cutting Pr
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ORIGINAL RESEARCH PAPER
Application of Superiority and Inferiority Multi-criteria Ranking Method for Parametric Optimization of Laser Cutting Processes Partha Protim Das 1 & Shankar Chakraborty 2 Received: 6 March 2020 / Revised: 11 June 2020 / Accepted: 14 July 2020 # Springer Nature Singapore Pte Ltd. 2020
Abstract Laser cutting of advanced engineering materials has now become quite attractive due to its various unique characteristics, like no tool wear, no built-up edge formation, no residual stress generation, no vibration etc. In order to enable this machining process to operate at its maximum competency, its’ different input parameters are often set at their optimal operating levels. This paper presents the applicability of superiority and inferiority multi-criteria ranking (SIR) method for determination of the best-suited parametric combinations for an Nd:YAG and a pulsed CO2 (carbon dioxide) laser cutting processes. The derived optimal parametric mixes obtained for the two considered laser cutting processes are validated based on the developed regression equations. In the Nd:YAG laser cutting process, an optimal parametric combination of gas pressure = 3 kg/cm2, pulse width = 0.6 ms, pulse frequency = 23 Hz, and cutting speed = 20 mm/min reduces the values of kerf width, kerf deviation, and kerf taper angle by 1.71, 2 and 25.88%, respectively. For the pulsed CO2 laser cutting process, the optimal mix determined as laser beam power = 3000 W, cutting velocity = 10 mm/s, gas pressure = 1.2 MPa and pulse frequency = 10 Hz causes reduction of 25.81, 6.65 and 2.84% in the values of surface roughness, kerf width and cut edge slope, respectively. Thus, it can be established that the response values estimated using the SIR method are better than those derived by the other optimisation techniques, while demonstrating its potentiality for parametric optimisation of laser cutting processes leading to enhanced performance. Keywords Laser cutting process . Optimisation . SIR method . Process parameter . Response
Introduction With the continuous development of various advanced engineering materials having diverse physical properties and strict application requirements, different non-traditional machining (NTM) processes have already emerged for generation of complicated shape geometries on those materials. Usually, in these processes, energies in the form of mechanical, electrical, chemical, thermal or combination of them are exploited for removal of material from the workpiece. But, these processes have also their own restrictions in respect of the nature of work material to be machined, shape geometry to be generated, toxicity, power consumption, machining cost etc. Laser beam * Shankar Chakraborty [email protected] 1
Department of Mechanical Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, Sikkim, India
2
Department of Production Engineering, Jadavpur University, Kolkata, West Bengal, India
machining (LBM) is an NTM process where material removal takes places usi
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