Numerical simulation of process dynamics during laser beam drilling with short pulses
Numerical simulation of process dynamics during laser beam drilling with short pulses
复制标题
DOI：
10.1007/s00339-011-6702-8
复制
发表时间：
2012-03-01
影响因子：
2.7
通讯作者：
Schmidt, Michael
中科院分区：
文献类型：
--
作者：
Leitz, Karl-Heinz;Koch, Holger;Schmidt, Michael
在过去的几年里，激光束钻孔在许多技术应用中变得越来越重要，因为它允许非接触式生产高质量的钻孔。到目前为止，主要短激光脉冲具有工业相关性，因为它们在精度和效率之间提供了良好的折衷，并且联合收割机将高烧蚀效率与工件的低热损伤相结合。在此脉冲长度范围内的激光束钻孔仍然是一个高热过程。烧蚀机制有两种：蒸发和熔体排出。为了获得高质量的加工结果，对基本工艺的理解是绝对必要的。然而，在激光束钻孔过程中的观察遭受短的时间尺度和相互作用区的可及性的限制。数值模拟提供了获得额外的过程知识的可能性，因为它们允许在消融过程中直接观察钻孔。在这篇文章中，数值有限体积多相模拟模型的激光束打孔与短激光脉冲。该模型适用于与μ s和ns的激光脉冲烧蚀过程的基础研究。所得到的结果与实验数据表现出良好的定性对应。
In the last years, laser beam drilling became increasingly important for many technical applications as it allows the contactless production of high quality drill holes. So far, mainly short laser pulses are of industrial relevance, as they offer a good compromise between precision and efficiency and combine high ablation efficiency with low thermal damage of the workpiece. Laser beam drilling in this pulse length range is still a highly thermal process. There are two ablation mechanisms: evaporation and melt expulsion. In order to achieve high quality processing results, a basic process understanding is absolutely necessary. Yet, process observations in laser beam drilling suffer from both the short time scales and the restricted accessibility of the interaction zone. Numerical simulations offer the possibility to acquire additional knowledge of the process as they allow a direct look into the drill hole during the ablation process. In this contribution, a numerical finite volume multi-phase simulation model for laser beam drilling with short laser pulses shall be presented. The model is applied for a basic study of the ablation process with mu s and ns laser pulses. The obtained results show good qualitative correspondence with experimental data.