Experimental Investigation on the Spatial-temporal Evolution of the hole formation during Laser Helical Drilling

International Conference on Manufacturing Technology, Materials and Chemical Engineering

材料科学;化学工业

Dong, Y.W.^1^2 ; Wu, Z.P.^2 ; Yan, W.G.^2 ; Li, X.J.^2 ; You, Y.C.^2

Shenzhen Research Institute, Xiamen University, No.19, Gaoxin South 4th Road, Nanshan District, Shenzhen

518057, China^1

School of Aerospace Engineering, Xiamen University, 422 South Siming Road, Xiamen

361005, China^2

关键词: Additional drillings;    Back propagation neural networks;    Experimental investigations;    Generalization ability;    Influence of process parameters;    Orthogonal experiment;    Single-factor experiments;    Spatial-temporal evolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/592/1/012156/pdf
DOI  :  10.1088/1757-899X/592/1/012156

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to study the influence of process parameters of femtosecond laser helical machining on the formation of micro-holes, we selected main parameters of the femtosecond laser helical drilling process, used 304 stainless steel as the target material, designed a 5-factor and 5-level orthogonal experiment based on the L 25 (56) orthogonal table, and analyzed the significance levels of the impacts of single pulse energy, repetition rate, rotation rate, rate of focus downward movement, and air-blowing pressure on the ablation depth. Based on back propagation (BP) neural network, we established the relationship model between five factors and the material ablation depth, and trained the network with orthogonal experiment data. We used the data of the additional drilling experiments to test the generalization ability of the established network, and the results show that the prediction error of the model is within 3%. We designed a single-factor experiment for the characteristic parameter of the helical drilling - the rate of focus downward movement - and obtained the effect of the rate of focus downward movement on the formation of the micro-holes during the process of femtosecond laser helical drilling.