Zhao Wanqin, Liu Haodong, Shen Xiaowei, Wang Lingzhi, Mei Xuesong
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel). 2019 Dec 19;13(1):31. doi: 10.3390/ma13010031.
Comparative study on micro-deep hole drilling by picosecond ultra-short pulse laser in four metals, including copper, aluminum alloy, titanium alloy, and nickel alloy, was presented. Destructive testing was performed to measure the depth, shape, and side-wall morphology of micro-deep holes in this study. Diameters and depths of micro-deep holes in four metals ablated using the same processing parameters were compared. The multiple thresholds of metals had been calculated. Relationships between hole dimensions and multiple thresholds (the average ablation threshold, the ablation threshold and the thermal threshold) and physical properties (for example, the heat capacity, the melting temperature, the optical penetration depth and the absorbance, etc.) of the four metals are examined. Furthermore, the surface and side-wall morphologies of the micro-deep holes in four metals were demonstrated. The influence mechanisms, especially the side-wall morphology, were discussed, such as the thresholds, conical emission, self-cleaning effect, physical properties of metals, the energy transmission, the plasma effect, thermochemical reaction, and so on.
本文介绍了皮秒超短脉冲激光对铜、铝合金、钛合金和镍合金这四种金属进行微深孔钻削的对比研究。本研究通过破坏性测试来测量微深孔的深度、形状和侧壁形貌。比较了使用相同加工参数烧蚀的四种金属中微深孔的直径和深度。计算了金属的多个阈值。研究了四种金属的孔尺寸与多个阈值（平均烧蚀阈值、烧蚀阈值和热阈值）以及物理性质（例如热容量、熔点、光穿透深度和吸收率等）之间的关系。此外，还展示了四种金属中微深孔的表面和侧壁形貌。讨论了影响机制，特别是侧壁形貌的影响机制，如阈值、锥形发射、自清洁效应、金属的物理性质、能量传输、等离子体效应、热化学反应等。
