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.

由于其高效率的激光钻孔和短脉冲钻孔被广泛应用于行业。但是，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较低的超短激光脉冲。用临时脉冲进行钻孔提供了一种吸引人的替代性替代性，结合了高效率和提高的精度。然而，尽管在增强的消融效率和表面质量方面，短激光脉冲的时间脉冲成型的功效已得到实验证明，但实验研究尚未导致对过程的深入了解。因此，在拟议的研究项目中，我们想结合数值和实验研究，以提高过程理解并开发分析过程模型。我们想更详细地了解材料去除的过程和机制，我们希望使用此获得的知识来根据特定的过程参数和钻探策略来量身定制脉冲形状。最后，结果将合并为为当前和潜在的工业用户制定实用准则。为了实现这些目标，该项目将分为两个阶段。在第一阶段，将进一步开发用于模拟激光束材料处理的内部瞬态流体数值模型，以实现精确建模钻井过程。因此，模型将包括多相描述和可压缩性。为了确保开发模型的准确性，将与模拟并行进行验证实验，从而实现模拟和实验结果的持续迭代比较。几种实验方法，包括金属磨碎的磨床，Schlieren摄影，泵探针设置以及夹层层的钻孔，将使用对材料和样品上方的材料和面积的深刻见解。在第二个项目阶段，模拟和实验将用于进行时间塑料和高斯激光脉冲的参数研究。通过这些研究，各种过程参数对过程动力学的影响，处理结果和效率将系统地分析单脉冲和打击乐钻孔。这些结果将结合起来，以开发一个分析过程模型，用于使用任意形状的脉冲的激光束钻孔的过程动力学和效率。然后，该模型将用于调整脉冲形状，以便根据过程参数和策略获得优化的钻孔结果，从而导致特定于应用的脉冲形状剪裁。在最后一步中，主要结果将在一组用户指南中汇总，该指南将为工业用户提供实用建议，以优化过程效率和钻探质量，具体取决于单个应用程序和过程参数。