Li Xiaoji, Dong Yiwei, Yin Chunping, Zhao Qi, You Yancheng. Geometric Parameters Evolution Experiment of Hole During Femtosecond Laser Helical Drilling[J]. Chinese Journal of Lasers, 2018, 45(5): 502008
- Chinese Journal of Lasers
- Vol. 45, Issue 5, 502008 (2018)
Fig. 1. Schematic diagram of femtosecond laser machining system
Fig. 2. Schematic diagram of laser helical scanning path
Fig. 3. Self-designed fixture system
Fig. 4. Aperture after the steel sheet is spliced and laser focus location
Fig. 5. Schematic of the plasma shielding phenomenon
Fig. 6. Hole evolution process with the focus down rate of 0
Fig. 7. Time-dependent change of microhole depth at different focus down rates
Fig. 8. Comparison of the ablation depth curve of the focus with and without moving down at a high speed
Fig. 9. Comparison of the ablation depth curve of the focus moving down at three different medium rates
Fig. 10. SEM images of the machined holes in different focus down rates with the processing time of 100 s. Focus down rates: (a) 0; (b) 0.005 mm/s; (c) 0.010 mm/s; (d) 0.015 mm/s; (e) 0.020 mm/s
Fig. 11. Transmission characteristics and light intensity distribution of the Gaussian beam
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Table 1. Related parameters of laser and machine
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Table 2. Factors and levels of orthogonal experiment
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Table 3. Schedule of focus down test
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Table 4. Range analysis of orthogonal experimental data
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Table 5. Variance analysis of orthogonal experimental data
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Table 6. Verification experimental data and network simulation results
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