Simulation and experimental research of auxiliary gas blowing in ultrafast laser hole drilling
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摘要: 同轴吹气结构辅助吹气对飞秒激光深孔加工效率有着重要影响，但在加工过程中存在排渣效果较差等情况。为了提升排渣能力，采用ANSYS CFD软件分别仿真了同轴吹气、旁轴吹气以及双路吹气的流场分布，并设计双路辅助吹气实验平台，进行了理论分析和实验验证，取得了微孔内部及周围的动态流场和流速矢量分布，以及同轴、旁轴和双路吹气结构辅助下微孔加工后孔口形貌。结果表明，双路辅助吹气不但可以提升加工效率，同时也有助于工件表面洁净度的提升，对飞秒激光高效深孔加工的实现有着重要意义。Abstract: Coaxial auxiliary gas blowing structure has important effect on the efficiency of deep hole machining by femtosecond laser, but there is poor effect of slag removal in the process. In order to improve the capacity of slag removal, ANSYS CFD software was used to simulate the distribution of flow field with coaxial gas blowing, paraxial gas blowing and double-channel gas blowing. Experimental platform of double-channel auxiliary gas blowing was designed. After theoretical analysis and experimental verification, the distribution of dynamic flow field and velocity vector of micropore inner and around the micropores were obtained. The hole morphologies were obtained after micropore treatment assisted by coaxial, paraxial and double-channel gas blowing structures. The results show that double-channel auxiliary gas blowing can not only improve processing efficiency but also help to clean the workpiece surface. It is of great significance to the realization of high efficiency deep hole processing by femtosecond laser.
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Keywords:
- optical fabrication /
- machining efficiency /
- auxiliary blowing /
- flow field analysis
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Figure 4. Contour map of flow field dynamic pressure of coaxial and paraxial gas blowing
a—p1=0.4MPa, p2=0MPa b—p1=0MPa, p2=0.4MPa
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Figure 5. Vector graph of pressure velocity in micro-hole of coaxial and paraxial gas blowing
a—p1=0.4MPa, p2=0MPa b—p1=0MPa, p2=0.4MPa
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Figure 6. Vector diagram of dynamic pressure and velocity of flow field when p1=0.4MPa and p2=1MPa
a—pressure b—velocity
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Figure 8. Hole morphology at different air blowing modes
a—coaxial blowing b—paraxial blowing c—double air blowing
Table 1 Processing time under different blowing modes
p1/MPa p2/MPa t/s 0.4 0 105 0 0.4 78 0.4 1 69 
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