Process Optimization for MOPA Fiber Laser Engraving of Carbon Steel

Fig. 6. Engraving results under different pulse widths. (a) Scatter diagram of MRR varying with $E_{D A}$ ; (b) scatter diagram of S_a varying with $E_{D A}$

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Fig. 7. 3D contour of depth engraving when pulse width is 270 ns and $E_{D A}$ is 4.5 J/mm²

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Fig. 8. S_a measurement diagram of depth engraving when pulse width is 270 ns and $E_{D A}$ is 4.5 J/mm²

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Fig. 9. Engraving results under different repetition frequencies. (a) Scatter diagram of MRR varying with PRF; (b) scatter diagram of S_a varying with PRF

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Fig. 10. Surface topography of depth engraving under different repetition frequencies. (a) 150 kHz; (b) 200 kHz; (c) 250 kHz;(d) 300 kHz; (e) 350 kHz; (f) 400 kHz

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Table 1. Chemical composition of carbon steel
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Table 1. Chemical composition of carbon steel
Chemical composition C O Fe Mo
Ratio /% 6.57 27.88 64.20 1.35

Table 2. Parameter table of regional depth engraving

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Table 2. Parameter table of regional depth engraving

Scanning speed /（mm·s^-1）

$E_{D A}$ /

（J·mm^-2）

τ=20 ns，

$F_{P R F_{0}}$ =900 kHz，

E_p=0.11 mJ

τ=48 ns，

$F_{P R F_{0}}$ =400 kHz，

E_p=0.25 mJ

τ=105 ns，

$F_{P R F_{0}}$ =140 kHz，

E_p=0.71 mJ

τ=170 ns， $F_{P R F_{0}}$ =90 kHz，

E_p=1.11 mJ

τ=220 ns， $F_{P R F_{0}}$ =90 kHz，

E_p=1.11 mJ

τ=270 ns，

F_{P R F_{0}}

=90 kHz，E_p=1.11 mJ

357

14.0

ΔS=0.4 μm，

P₀=99%

ΔS=0.9 μm，

P₀=98%

ΔS=2.6 μm，

P₀=92%

ΔS=3.9 μm，

P₀=88%

ΔS=3.9 μm，

P₀=88%

ΔS=3.9 μm，

P₀=88%

714

7.0

ΔS=0.8 μm，

P₀=98%

ΔS=1.8 μm，

P₀=95%

ΔS=5.1 μm，

P₀=85

ΔS=7.9 μm，

P₀=76%

ΔS=7.9 μm，

P₀=76%

ΔS=7.9 μm，

P₀=76%

1111

4.5

ΔS=1.2 μm，

P₀=96%

ΔS=2.8 μm，

P₀=92%

ΔS=7.9 μm，

P₀=76%

ΔS=12.3 μm，

P₀=63%

ΔS=12.3 μm，

P₀=63%

ΔS=12.3 μm，

P₀=63%

1429

3.5

ΔS=1.6 μm，

P₀=95%

ΔS=3.6 μm，

P₀=90%

ΔS=10.2 μm，

P₀=69%

ΔS=15.9 μm，

P₀=52%

ΔS=15.9 μm，

P₀=52%

ΔS=15.9 μm，

P₀=52%

1667

3.0

ΔS=1.9 μm，

P₀=94%

ΔS=4.2 μm，

P₀=87%

ΔS=11.9 μm，

P₀=64%

ΔS=18.5 μm，

P₀=44%

ΔS=18.5 μm，

P₀=44%

ΔS=18.5 μm，

P₀=44%

2000

2.5

ΔS=2.2 μm，

P₀=93%

ΔS=5.0 μm，

P₀=85%

ΔS=14.3 μm，

P₀=57%

ΔS=22.2 μm，

P₀=33%

ΔS=22.2 μm，

P₀=33%

ΔS=22.2 μm，

P₀=33%

2500

2.0

ΔS=2.8 μm，

P₀=91%

ΔS=6.3 μm，

P₀=81%

ΔS=17.9 μm，

P₀=46%

ΔS=27.8 μm，

P₀=16%

ΔS=27.8 μm，

P₀=16%

ΔS=27.8 μm，

P₀=16%

3333

1.5

ΔS=3.7 μm，

P₀=88%

ΔS=8.3 μm，

P₀=74%

ΔS=23.8 μm，

P₀=28%

ΔS=37.0 μm，

P₀=8%

ΔS=37.0 μm，

P₀=8%

ΔS=37.0 μm，

P₀=8%

Table 3. Effect of PRF on engraving effect
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Table 3. Effect of PRF on engraving effect
RPF /kHz E_p /mJ P₀ /%
150 0.95 71
200 0.72 78
250 0.57 82
300 0.47 85
350 0.41 87
400 0.36 89

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Dungang Zhang, Wenshu Luo, Jing Dong, Hailin Wang, Xiao Zhu, Guangzhi Zhu. Process Optimization for MOPA Fiber Laser Engraving of Carbon Steel[J]. Acta Optica Sinica, 2022, 42(20): 2014001

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