Title: Optimisation of Nd:YAG laser micro-turning process using response surface methodology

Authors: G. Kibria; B. Doloi; B. Bhattacharyya

Addresses: Mechanical Engineering Department, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East Sikkim – 737136, India. ' Production Engineering Department, Jadavpur University, Kolkata 700032, India. ' Production Engineering Department, Jadavpur University, Kolkata 700032, India

Abstract: The present paper investigates the laser micro-turning operation on cylindrical aluminium oxide (Al₂O₃) ceramic to study the influence of different process parameters namely, laser average power, pulse frequency, workpiece rotational speed, assist air pressure and Y feed rate on surface roughness (Ra and Rt) and micro-turning depth deviation. The mathematical models for the responses have been developed based on response surface methodology (RSM). Through different surface plots, analyses have been made to study the influences of process parameters on responses. The adequacy of the developed models has been tested through analysis of variance (ANOVA). To investigate into the variation in the output for small variations in significant process parameters, sensitivity analyses (SA) have been done of the models developed for each response. Multi-objective optimisation has also been performed for searching out the optimal parametric condition for achieving minimum surface roughness and minimum depth deviation during laser micro-turning process.

Keywords: laser micro-turning; Nd:YAG lasers; surface roughness Ra; Rt; alumina; response surface methodology; RSM; sensitivity analysis; depth deviation; micromachining; aluminium oxide; ceramics; mathematical modelling; process parameters; ANOVA; optimisation.

DOI: 10.1504/IJPTECH.2012.045986

International Journal of Precision Technology, 2012 Vol.3 No.1, pp.14 - 36

Published online: 22 Apr 2015 *

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