Tao Li, Kaibo Xia, Naifei Ren, Fuqiang Gao, Wen Zhang, Jianan Tian, Yongsheng Fan. Study on Pulse Laser Drilling Based on Improved Parameter Control Method[J]. Laser & Optoelectronics Progress, 2020, 57(19): 191403
- Laser & Optoelectronics Progress
- Vol. 57, Issue 19, 191403 (2020)
Fig. 1. Schematic of millisecond pulse laser drilling system
Fig. 2. Calculation of via-hole taper
Fig. 3. Schematic of penetration detection principle. (a) Schematic of detection device; (b) schematic of pulse signal
Fig. 4. Influence of defocusing amount on entrance and end diameters of via-hole
Fig. 5. Influence of defocusing amount on threshold of pulse number
Fig. 6. Cross sections and taper a change of via-hole drilled under different defocusing amounts. (a) -2.8 mm; (b) -1.8 mm; (c) 0.8 mm; (d) 0 mm; (e) 0.8 mm; (f) 1.8 mm; (g) 2.8 mm; (h) taper change of via-hole
Fig. 7. Schematic of beam expansion ratio
Fig. 8. Influence of beam expanding ratio on entrance and end diameters of via-hole
Fig. 9. Influence of beam expanding ratio on threshold of pulse number
Fig. 10. Cross sections and taper change of via-hole drilled under different beam expanding ratios. (a) 1; (b) 1.8; (c) 2.8; (d) 3.8; (e) 4.8; (f) 5.8;(g) taper change of via-hole
Fig. 11. Experimental results of drilling holes in argon
Fig. 12. Influence of pulse repetition frequency on entrance and end diameters of via-hole
Fig. 13. Influence of pulse repetition frequency on threshold of pulse number
Fig. 14. Cross sections and taper change of via-hole drilled under different pulse repetition frequencies. (a) 15 Hz; (b) 25 Hz; (c) 35 Hz; (d) 45 Hz; (e) 65 Hz; (f) 85 Hz; (g) 100 Hz;(h) taper change of via-hole
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Table 1. Chemical composition of nickel-based superalloy GH4037
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Table 2. Improved control variable method
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Table 3. Comparison of drilling efficiency between improved control variable method and traditional control variable method under different defocusing amounts
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Table 4. Comparison of drilling efficiency between improved control variable method and traditional control variable method under different beam expanding ratios
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Table 5. Comparison of drilling efficiency between improved control variable method and traditional control variable method under different pulse repetition frequencies
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