New method of continuous-wave laser ablation for processing microgroove with variable cross-section
New method of continuous-wave laser ablation for processing microgroove with variable cross-section
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DOI：
10.1016/j.optlastec.2023.110292
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Jian-wei Ma;Hui Zhang;Tao Ye;Song-hong-ze Wang;Zhi-Ben Yang;Zhen-yuan Jia
中科院分区：
文献类型：
--
作者：
Jian-wei Ma;Hui Zhang;Tao Ye;Song-hong-ze Wang;Zhi-Ben Yang;Zhen-yuan Jia
表面微槽能有效减阻，在节能环保方面具有无可比拟的优势。在微槽加工中，激光加工具有加工效率高、无刀具磨损、无加工应力等优点，在微槽加工中显示出广阔的应用前景。然而，在给定的工艺参数下，激光光斑的能量分布是固定的，很难在单个微槽中实现不同的截面形状，这可能具有更好的减阻性能。在这种情况下，论证了变截面微槽的减阻效果，并通过流体模拟分析了其减阻机理。在此基础上，提出了一种新的加工方法--移动变焦激光加工，实现了等深变宽微槽的加工。为了有序规划激光加工参数，建立了连续波激光(CW)紧聚焦烧蚀模型，预测了微槽形状，其宽度和深度的预测误差分别为4.53亿μm和6.77亿μm。然后，将烧蚀模型推广到散焦条件下，对散焦情况下微槽宽度和深度的预测误差分别小于3%和9%。此外，还介绍了移动变焦激光加工中工艺参数的规划方法。最后，通过实验验证了该方法的可行性，并用该方法成功地加工出了深度为24μm、宽度为165~231μm的微槽。所提出的加工策略为表面微槽减阻技术提供了良好的参考依据。
Surface microgrooves can effectively reduce the drag and have unparalleled advantages in energy saving and environmental protection. In the fabrication of microgrooves, the laser processing has shown a broad prospect in the fabrication of microgrooves for the advantages of high processing efficiency, no tool wear, no processing stress, etc. However, under the given process parameters, the energy distribution of the laser spot is fixed, and it is difficult to achieve different cross-sectional shapes in a single microgroove, which may have better performance for the drag reduction. In this situation, the effect of variable cross-section microgrooves on the drag reduction is demonstrated and the drag reduction mechanism is analyzed through the fluid simulation. Further, a novel method, moving zoom laser processing, is proposed to realize the fabrication of microgrooves with variable width at equal depth. For orderly planning of the laser processing parameters, the continuous wave laser (CW laser) ablation model is established under ‘tight focusing’ arrangement with predicted microgroove profiles, and the prediction errors of the model for the width and depth are 4.53 μm and 6.77 μm, respectively. Then, the ablation model is extended to the defocusing condition, and the prediction errors of the width and the depth of the microgroove under defocus arrangement are less than 3 % and 9 %, respectively. Additionally, the planning method of the process parameters in the moving zoom laser processing is introduced. Finally, the feasibility of the proposed method is verified experimentally and the microgroove with a depth of 24 μm and a width of 165–231 μm is successfully fabricated by the proposed method. With the proposed processing strategies, a good and concerned reference is provided for drag reduction technology with surface microgroove.