Advances in Production Engineering & Management
Volume 14 | Number 4 | December 2019 | pp 407–420
https://doi.org/10.14743/apem2019.4.337
Femtosecond laser helical drilling of nickel-base single-crystal super-alloy: Effect of machining parameters on geometrical characteristics of micro-holes
Yin, C.P.; Wu, Z.P.; Dong, Y.W.; You, Y.C.; Liao, T.
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A B S T R A C T
Laser micro-hole processing has been widely used in industry. Many laser processing parameters can affect the processing results. The relationship between the geometrical shapes of micro-holes and the laser processing parameters has not been determined accurately. In this paper, experiments on the femtosecond laser drilling of the nickel-base single-crystal super-alloy (DD6) materials were conducted to determine the relationship between the parameters, such as the laser single-pulse energy, rotation rate, and downward focus rate, and the geometrical characteristics of the micro-holes, such as the diameter, and roundness. A group of orthogonal experiments were conducted to determine the effects of the comprehensive influencing factors on the geometrical characteristics of the micro-holes. After the experiments were conducted and analysed, the experimental results were modelled by a backpropagation neural network, and the mapping relationship between the laser parameters and the geometrical morphologies of the micro-holes was constructed. The model established by the backpropagation neural network could obtain accurate prediction results, and the predictions of the diameters of the micro-holes were better than those of the roundness.
A R T I C L E I N F O
Keywords • Femtosecond laser; Micro-hole machining; Helical drilling; Nickel-base single-crystal super-alloy (DD6); Orthogonal experiment; Artificial neural networks (ANN)
Corresponding author • Jiang, C.
Article history • Received 26 November 2019, Revised 10 December 2019, Accepted 11 December 2019
Published on-line • 22 December 2019
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