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Generation of Defined Micro-Turning Surface Roughness on Al2O3 Ceramic by Pulsed Nd:Yag Laser Micro-Turning Process
G. Kibria, B. Doloi and B. Bhattacharyya

Laser micro-turning process is one of the latest and emerging technologies in the field of laser materials processing of engineering materials. The present paper deals with experimental investigation on Nd:YAG laser micro-turning operation of cylindrical shaped Al2O3 ceramic to explore the effect various significant process parameters such as laser beam average power, workpiece rotating speed, axial feed rate, pulse frequency and assist air pressure. Experiments were conducted considering the response surface methodology (RSM) based design of experiments (DoE). Mathematical models were developed for the responses; namely, surface roughness (Ra) and depth deviation. The validity and correctness of the developed mathematical models is carried out through analysis of variance (ANOVA) test. The target surface roughness and machining depth are as 6.0 and 100.0 μm, respectively. To achieve these target criteria, optimum parametric combination is found through RSM.

Keywords: Nd:YAG laser, alumina, Al2O3, laser micro-turning, surface roughness, depth deviation, response surface methodology (RSM), design of experiments (DoE)

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