Picosecond Laser Drilling of Carbon Fiber Reinforced Composite Laminates by Helical Drilling Process

Nengru Tao; Song Cai; Genyu Chen; Zhengming Xiao; Yi Wei

doi:10.3788/AOS240584

Acta Optica Sinica, Volume. 44, Issue 14, 1422003(2024)

Picosecond Laser Drilling of Carbon Fiber Reinforced Composite Laminates by Helical Drilling Process

Nengru Tao^1,2, Song Cai^1、*, Genyu Chen², Zhengming Xiao², and Yi Wei^1,2

Author Affiliations

¹School of Intelligent Manufacturing, Hunan First Normal University, Changsha 410205, Hunan , China

²Laser Research Institute, Hunan University, Changsha 410082, Hunan , China

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Abstract Get PDF(in Chinese)

Figures & Tables(17)

Fig. 1. Schematic diagram of helical drilling processing device by picosecond laser

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Fig. 2. Optical system of helical drilling

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Fig. 3. Method of helical drilling for CFRP

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Fig. 4. Heat affected zones of hole entrance and exit at different deflection angles. (a) Hole entrance; (b) hole exit

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Fig. 5. Processing quality of helical drilling at different deflection angles. (a) Heat affected zone; (b) hole diameter and taper

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Fig. 6. Hole diameter control principle

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Fig. 7. Heat affected zones of hole entrance and exit at different shift values of reflection mirror. (a) Hole entrance; (b) hole exit

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Fig. 8. Processing quality of helical drilling at different shift values of reflection mirror. (a) Heat affected zone; (b) hole diameter and taper

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Fig. 9. Schematic diagrams of drilling hole formation at different shift values of reflection mirror. (a) -4 mm; (b) 0; (c) 4 mm

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Fig. 10. Processing quality of helical drilling at different rotary speeds. (a) Heat affected zone; (b) hole diameter and taper

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Fig. 11. Heat affected zones of hole entrance and exit at different laser powers. (a) Hole entrance; (b) hole exit

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Fig. 12. Processing quality of helical drilling at different laser energy densities. (a) Heat affected zone; (b) hole diameter and taper

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Fig. 13. Processing quality of helical drilling at different pulse repetition frequency. (a) Heat affected zone; (b) hole diameter and taper

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Fig. 14. Processing quality of helical drilling at different scanning directions. (a) Hole entrance; (b) hole exit

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Table 1. Laser parameters
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Table 1. Laser parameters
Parameter Value
Average power P_a /W 30-100
Repetition frequency f /MHz 0.4-2.0
Focus radius r₀ /µm 20
Wavelength λ /nm 1064
Pulse duration τ₀ /ps 10

Table 2. Thermal-physical parameter of CFRP

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Table 2. Thermal-physical parameter of CFRP

Parameter	Epoxy resin	Parallel fiber axis direction	Vertical fiber axis direction
Evaporation temperature T_V /℃	527	3627	3600
Density ρ /（kg/m³）	1250	1850	1850
Heat conductivity k /（W·m^-1·K^-1）	0.2	50	5
Specific heat capacity c /（J·kg^-1·℃^-1）	1200	710	710
Absorptivity /%	-	83.7	58.4

Table 3. Process parameters for helical drilling

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Table 3. Process parameters for helical drilling

Parameter	Value
CFRP thickness /mm	4
Eccentric distance R /mm	2
Deflection angle /（°）	6, 12, 18, 24, 30
Shift value /mm	-4, -3, -2, -1, 0, 1, 2, 3, 4
Rotary speed /（r/min）	3000, 4000, 5000, 6000, 7000
Laser power /W	30, 40, 50, 60, 70, 80, 90,100
Repetition frequency /MHz	0.4, 0.8, 1.2, 1.6, 2.0

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Nengru Tao, Song Cai, Genyu Chen, Zhengming Xiao, Yi Wei. Picosecond Laser Drilling of Carbon Fiber Reinforced Composite Laminates by Helical Drilling Process[J]. Acta Optica Sinica, 2024, 44(14): 1422003

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