Article: Simultaneous optimisation of average kerf taper and surface roughness during pulsed Nd: YAG laser cutting of thin Al-alloy sheet for straight profile Journal: International Journal of Manufacturing Technology and Management (IJMTM) 2013 Vol.27 No.1/2/3 pp.112 - 126 Abstract: This paper presents an application of DOE-based hybrid approach for the determination of preferred operating laser cutting parameters which minimises the average kerf taper (Ta) and average surface roughness (Ra) together during pulsed Nd: YAG laser cutting of thin aluminium alloy sheet for straight profile. The hybrid approach, comprises of Taguchi methodology (TM) and response surface methodology (RSM), has been applied to achieve the better cut qualities within the existing resources. The input process parameters taken are oxygen pressure, pulse width, pulse frequency and cutting speed. The approach first uses the Taguchi quality loss function to find the optimum level of laser cutting parameters. The optimum values of input cutting parameters so obtained are further used as a central value in RSM. Further, the experiments are conducted by using the central composite rotatable design (CCRD) matrix. Subsequently, the laser cutting parameters have been optimised by using the MINITAB software. The application of hybrid approach has reduced Ta by 15% whereas it has been reduced by 6.7% with the application of TM only. Inderscience Publishers - linking academia, business and industry through research

Title: Simultaneous optimisation of average kerf taper and surface roughness during pulsed Nd: YAG laser cutting of thin Al-alloy sheet for straight profile

Authors: Amit Sharma; Vinod Yadava

Addresses: Mechanical Engineering Department, Jaypee University of Engineering and Technology, A.B. Road, Raghogarh, Guna – 473226, India ' Mechanical Engineering Department, Jaypee University of Engineering and Technology, A.B. Road, Raghogarh, Guna – 473226, India

Abstract: This paper presents an application of DOE-based hybrid approach for the determination of preferred operating laser cutting parameters which minimises the average kerf taper (T_a) and average surface roughness (R_a) together during pulsed Nd: YAG laser cutting of thin aluminium alloy sheet for straight profile. The hybrid approach, comprises of Taguchi methodology (TM) and response surface methodology (RSM), has been applied to achieve the better cut qualities within the existing resources. The input process parameters taken are oxygen pressure, pulse width, pulse frequency and cutting speed. The approach first uses the Taguchi quality loss function to find the optimum level of laser cutting parameters. The optimum values of input cutting parameters so obtained are further used as a central value in RSM. Further, the experiments are conducted by using the central composite rotatable design (CCRD) matrix. Subsequently, the laser cutting parameters have been optimised by using the MINITAB software. The application of hybrid approach has reduced T_a by 15% whereas it has been reduced by 6.7% with the application of TM only.

Keywords: laser cutting; Taguchi methods; response surface methodology; RSM; central composite rotatable design; CCRD; hybrid approach; optimisation; aluminium alloy sheet; average kerf taper; surface roughness; laser cutting; thin sheet; straight profiles; surface quality; oxygen pressure; pulse width; pulse frequency; cutting speed; quality loss function.

DOI: 10.1504/IJMTM.2013.058622

International Journal of Manufacturing Technology and Management, 2013 Vol.27 No.1/2/3, pp.112 - 126

Published online: 29 Apr 2014 *

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Title: Simultaneous optimisation of average kerf taper and surface roughness during pulsed Nd: YAG laser cutting of thin Al-alloy sheet for straight profile

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