A comparative study on high pulse energy femtosecond laser drilling of high-aspect-ratio holes under different pressure conditions

Wang, Rujia; Wang, Kedian; Fan, Zhengjie; Sun, Xiangfei; Dong, Xia; Mei, Xuesong; Zhang, Wenwu

doi:10.1016/j.jmapro.2022.11.079

Cited by 12 publications

(2 citation statements)

References 27 publications

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“…In the pharmaceutical and biotech industries, there is a demand for micro-holes arranged in a grid pattern, as they are critical for fulfilling various functions such as injection or filtering [14,15]. The surface morphology surrounding these holes should be smooth [16][17][18]. The use of short and ultra-short laser pulses, which enable penetration with minimal thermal damage, is expected to be more applicable for drilling particularly tiny holes within the range of 1-100 μm.…”

Section: Introductionmentioning

confidence: 99%

Picosecond laser drilling grids in aluminium foil at 532 and 355 nm wavelengths

Tojinazarov,

Sobirov,

Ibragimova

et al. 2024

Eng. Res. Express

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Ultra-short laser drilling technique enables production of filters, membranes, microfluidic, photonic, and biomedical devices. Micro-hole grids were drilled in aluminum foil using a 28 picosecond Nd:YAG laser operated at wavelength of 532 and 355 nm with energy up to 18 and 12 mJ, respectively. Varying pulse energy and number, micro-holes obtained at 355 nm and 3.6-9 mJ had the appropriate mean diameter of 36-86 μm. However, the circularity changed in 0.5-0.94. For the 2nd harmonic the mean diameter varied 15-61 μm at 0.36-9 mJ with the circularity of 0.81-0.92. The morphology of the area surrounding micro-holes investigated by scanning electron microscopy exhibited distribution of droplets dominated size 0.9-10 μm , which is feasible for filtration of contaminated liquids. Local elemental composition of the area determined by energy dispersive spectroscopy discovered significant increase in the concentration of C and O, and also emergency of F, depending on laser fluence under vapor-dominated ablation mode, where nuclear reactions are excited in hot plasma.

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Section: Introductionmentioning

confidence: 99%

Picosecond laser drilling grids in aluminium foil at 532 and 355 nm wavelengths

Tojinazarov,

Sobirov,

Ibragimova

et al. 2024

Eng. Res. Express

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“…However, the processing quality of film-cooling holes also significantly affects the service life of turbine blades to a large extent [12]. Achieving optimal processing parameters and ensuring the quality of micro-holes for femtosecond laser percussion drilling is challenging because of the complex nature of the coupled parameters involved [13].…”

Section: Introductionmentioning

confidence: 99%

Design of a Femtosecond Laser Percussion Drilling Process for Ni-Based Superalloys Based on Machine Learning and the Genetic Algorithm

Zhao,

Yu,

Sun

et al. 2023

Micromachines

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Femtosecond laser drilling is extensively used to create film-cooling holes in aero-engine turbine blade processing. Investigating and exploring the impact of laser processing parameters on achieving high-quality holes is crucial. The traditional trial-and-error approach, which relies on experiments, is time-consuming and has limited optimization capabilities for drilling holes. To address this issue, this paper proposes a process design method using machine learning and a genetic algorithm. A dataset of percussion drilling using a femtosecond laser was primarily established to train the models. An optimal method for building a prediction model was determined by comparing and analyzing different machine learning algorithms. Subsequently, the Gaussian support vector regression model and genetic algorithm were combined to optimize the taper and material removal rate within and outside the original data ranges. Ultimately, comprehensive optimization of drilling quality and efficiency was achieved relative to the original data. The proposed framework in this study offers a highly efficient and cost-effective solution for optimizing the femtosecond laser percussion drilling process.

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