Infrared and Laser Engineering, Volume. 50, Issue 10, 20200446(2021)
Annular drilling process and quality control neural network model of stainless steel micro-hole with femtosecond laser
Figures & Tables(17)
Fig. 4. (a) Schematic diagram of the minimum area method to evaluate roundness; (b) Schematic diagram of taper
Fig. 8. Schematic of correlation between ablation regions (a) and laser energy density distribution (b)
Table 1. Femtosecond laser technical parameters
View tableView in ArticleTable 1. Femtosecond laser technical parameters
Property Value Property Value Power/W ≤2.0 Waist radius/μm 12 Pulse width/fs 120 Energy stability/RMS <0.75% Wavelength/nm 800 Focal roundness >85% Frequency/kHz ≤10 Beam quality M2≤1.2 Laser diameter/mm 6 Divergence half-angle/mrad 0.10
Table 2. 06Cr19Ni10 stainless steel physical parameters
View tableView in ArticleTable 2. 06Cr19Ni10 stainless steel physical parameters
Property Value Density/g·cm−3 7.2 Specific heat capacity/J·kg−1·K 711.8 Melting point/K 1700 Boiling point/K 3200 Tensile strength/MPa ≥515 Yield strength/MPa ≥205 Hardness/HBW ≤201
Table 3. Factors and levels of orthogonal experiment
View tableView in ArticleTable 3. Factors and levels of orthogonal experiment
Parameter 1 2 3 4 5 A Laser power/W 1 1.25 1.5 1.75 2 B Repetition rate/kHz 8 8.5 9 9.5 1 C Defocus/μm −400 −200 0 200 400 D Scanning speed/mm·s−1 0.1 0.5 1 1.5 2 E Scanning times 10 20 30 40 50
Table 4. Range analysis of micro-hole entrance and exit diameter
View tableView in ArticleTable 4. Range analysis of micro-hole entrance and exit diameter
Level A B C D E Laser power/W Entrance/μm Exit/μm Repetition rate/kHz Entrance/μm Exit/μm Defocus/μm Entrance/μm Exit/μm Scanning speed/mm·s−1 Entrance/μm Exit/μm Scanning times Entrance/μm Exit/μm 1 104.37 89.93 108.54 93.56 118.77 86.40 111.62 101.89 100.74 80.94 2 107.87 90.66 107.43 99.25 109.33 90.76 109.19 99.08 102.23 96.08 3 112.95 96.45 105.62 100.40 115.26 98.95 110.40 95.74 104.70 95.74 4 118.28 104.08 109.23 93.34 107.33 101.68 103.58 90.63 110.35 93.63 5 126.62 106.13 112.27 96.52 103.40 87.40 108.27 92.73 123.06 98.73 Rj 18.245 16.2 6.65 7.06 15.37 15.28 8.04 11.26 22.32 18.14
Table 5. Variance analysis of orthogonal experimental date
View tableView in ArticleTable 5. Variance analysis of orthogonal experimental date
Source of variation Sum of squares Degree of freedom Mean square error F-value Significance Laser power 170.9 4 42.72 0.91 * Repetition rate 103.4 4 25.84 0.55 Defocus 158.1 4 39.51 0.84 Scanning speed 119.1 4 29.77 0.63 Scanning times 232.4 4 58.11 1.24 ** Error 187.7 4 46.93 Total 971.6 24
Table 6. Range analysis of roundness and taper of micro-hole entrance
View tableView in ArticleTable 6. Range analysis of roundness and taper of micro-hole entrance
Level A B C D E Laser power/W Roundness/μm Taper/(°) Repetition rate/kHz Roundness/μm Taper/(°) Defocus/μm Roundness/μm Taper/(°) Scanning speed/mm·s−1 Roundness/μm Taper/(°) Scanning times Roundness/μm Taper/(°) 1 11.6 0.014 4 14.7 0.015 0 9.2 0.032 4 8.9 0.009 7 17.6 0.019 8 2 13.5 0.017 2 11.4 0.008 2 11.3 0.018 6 8.7 0.010 1 13.4 0.006 2 3 12.9 0.016 5 10.5 0.005 2 10.8 0.016 3 10.9 0.014 7 10.5 0.009 0 4 15.6 0.014 2 12.7 0.015 9 13.4 0.005 6 12.6 0.013 0 9.4 0.016 7 5 17.8 0.020 5 13.1 0.015 8 16.7 0.016 0 15.9 0.015 5 8.3 0.024 3 Rj 6.2 0.006 3 4.2 0.010 7 7.5 0.026 7 7.2 0.005 8 9.3 0.018 2
Table 7. Experimental data and network prediction results
View tableView in ArticleTable 7. Experimental data and network prediction results
Number Entrance diameter/μm Relative error Exit diameter/μm Relative error Experimental value Predictive value Experimental value Predictive value 21 112.6 108.66 3.5% 96.8 93.12 3.8% 22 105.4 110.46 4.8% 86.5 90.22 4.3% 23 108.7 108.97 2.6% 88.2 91.20 3.4% 24 115.8 107.93 6.8% 97.8 103.57 5.9% 25 122.3 113.01 7.6% 101.3 94.51 6.7%
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Duanmu Yue, Huilai Sun, Xue Yang, Jianlin Sun. Annular drilling process and quality control neural network model of stainless steel micro-hole with femtosecond laser[J]. Infrared and Laser Engineering, 2021, 50(10): 20200446
Paper Information
Category: Lasers & Laser optics
Received: Nov. 21, 2020
Accepted: --
Published Online: Dec. 7, 2021
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