Research of temperature distribution in float glass after heating by 6.45μm laser
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摘要: 为了提升激光可控断裂法切割玻璃的质量，研究了6.45μm激光照射浮法玻璃后材料的温度变化。利用激光输出的连续功率计算了6.45μm激光照射玻璃后的温度分布，并通过实验验证了该模型的正确性；模拟对比了相同激光参量下6.45μm激光和10.6μm激光加热玻璃后的温度场，通过实验获得了光滑、无表面裂纹的切割样品。结果表明，6.45μm激光产生的表面温度低于10.6μm激光；6.45μm激光可以利用热裂法获得高质量切割端面。该研究对中红外激光玻璃切割的模型建立和方案优化具有一定的帮助。Abstract: In order to improve the quality of glass cut by laser controlled fracture method, the temperature change of material after 6.45μm laser irradiation was studied. The temperature distribution of glass irradiated by 6.45μm laser was calculated by using the continuous laser output power, and the correctness of the model was verified by experiments. Temperature field of glass heated by 6.45μm laser and 10.6μm laser under the same laser parameters was simulated and compared. The smooth and crack-free cutting samples were obtained by experiment. The results show that, the surface temperature of 6.45μm laser is below than that of 10.6μm laser. 6.45μm laser can obtain high quality cutting face by hot cracking. The research is helpful for the modeling and the optimization of mid infrared laser glass cutting.
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Keywords:
- laser technique /
- laser cutting /
- crack controlled method /
- 6.45μm laser /
- float glass
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Figure 4. Comparison of the measured and predicted temperatures at laser spot center after 2s exposure of 6.45μm laser with different power and spot diameters
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Figure 5. Comparison of the measured and predicted temperatures at laser spot center after 2s exposure of 6.45μm laser at different distances
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Figure 6. Comparison of the measured and predicted temperatures at laser spot center after 2s exposure of 6.45μm laser at different time
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Figure 7. Axial temperature profile comparison below laser spot center after 400μs laser irradiation
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Figure 9. Comparison of the calculated spatial and temporal temperature profiles of laser-heated fused silica using a 6.45μm laser versus that using a 10.6μm laser
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Figure 10. a—photographs of separation surfaces using 6.45μm laser b—photographs of separation surfaces using mechanical cutting method c—section image after laser cut d—SEM graph of profile after laser cut
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