Multi-Physics Modeling of Laser Beam Drilling with Temporally Shaped Pulses

使用时间整形脉冲进行激光束钻孔的多物理场建模

• 批准号: 278627194
• 负责人: Professor Dr.-Ing. Michael Schmidt
• 金额: --
• 依托单位: Lehrstuhl für Photonische Technologien (LPT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278627194?language=en
• 关键词: Multi; Physics; Modeling; Laser; Beam

Due to its high efficiency laser drilling with short pulses is widely applied in industry. However, for quality sensitive applications the limited processing accuracy increasingly necessitates the use of ultrashort laser pulses with drastically lower efficiency. Drilling with temporally shaped pulses offers an appealing alternative combining high efficiency with enhanced precision. However, although the efficacy of temporal pulse shaping of short laser pulses in terms of increasing ablation efficiency and surface quality has been experimentally proven, experimental investigations have not yet led to an in-depth understanding of the process. Therefore, in the proposed research project we would like to combine numerical and experimental investigations in order to increase process understanding and to develop an analytical process model. Understanding the process and the mechanisms of material removal in more detail, we would like to use this acquired knowledge to tailor pulse shapes depending on case-specific process parameters and the drilling strategy. Finally, the results will be combined to develop practical guidelines for current and potential industrial users.To meet these objectives, the project will be divided into two phases. In the first phase, an in-house predeveloped transient fluiddynamic numerical model for the simulation of laser beam material processing will be developed further to enable accurate modeling of the drilling process. Therefore, a multi-phase description and compressibility will be included into the model. To ensure accuracy of the model under development, verification experiments will be conducted in parallel to the simulations, enabling constant iterative comparison of simulative and experimental results. Several experimental methods, comprising metallographic grindings, Schlieren photography, pump-probe setups and drilling of sandwiched layers will be used providing deep insight into both material and the area above the sample.In the second project phase, simulations and experiments will be used to conduct parameter studies for both temporally shaped and Gaussian laser pulses. With these investigations, the influence of various process parameters onto process dynamics, processing results and efficiency will be systematically analyzed for single pulse and percussion drilling. These results will be combined to develop an analytic process model for process dynamics and efficiency of laser beam drilling with arbitrarily shaped pulses. This model will then be used to adjust pulse shapes such that an optimized drilling result is obtained depending on the process parameters and strategies, leading to application-specific pulse shape tailoring. In the final step, the main results will be summarized in a set of user guidelines, which will comprise practical advice for industrial users to optimize process efficiency and drilling quality depending on the individual application and process parameters.

短脉冲激光打孔由于其高效率而在工业上得到了广泛的应用。然而，对于质量敏感的应用，有限的加工精度越来越需要使用效率极低的超短激光脉冲。利用时间成形脉冲进行钻孔提供了一种将高效率与增强的精度相结合的有吸引力的替代方案。然而，虽然短激光脉冲的时间脉冲整形在提高烧蚀效率和表面质量方面的功效已经被实验证明，但实验研究尚未导致对该过程的深入理解。因此，在拟议的研究项目中，我们想结合联合收割机的数值和实验研究，以增加过程的理解，并开发一个分析过程模型。通过更详细地了解材料去除的工艺和机制，我们希望利用这些知识根据具体情况的工艺参数和钻孔策略定制脉冲形状。最后，将综合研究结果，为现有和潜在的工业用户制定实用指南。在第一阶段，将进一步开发用于模拟激光束材料加工的内部预开发瞬态流体动力学数值模型，以实现钻孔过程的精确建模。因此，多相描述和可压缩性将被纳入模型。为了确保开发模型的准确性，验证实验将与模拟并行进行，从而能够不断迭代比较模拟和实验结果。在第二个项目阶段，将使用模拟和实验方法对时间形状和高斯激光脉冲进行参数研究，包括金相研磨、纹影摄影、泵浦探测装置和夹层钻孔。在此基础上，系统地分析了单脉冲和冲击钻削过程中各种工艺参数对钻削动力学、加工效果和效率的影响。这些结果将结合起来，开发一个分析过程模型的过程动力学和效率的激光束打孔与任意形状的脉冲。然后，该模型将用于调整脉冲形状，从而根据工艺参数和策略获得优化的钻孔结果，从而实现特定于应用的脉冲形状定制。在最后一步中，主要结果将总结在一套用户指南中，其中将包括工业用户的实用建议，以根据个人应用和工艺参数优化工艺效率和钻孔质量。