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Model heat source using actual distribution of laser power density for simulation of laser processing

利用激光能量分布自动建立热源模型及其在激光加工仿真的应用

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Abstract

The model of heat source (MHS) which reflects the thermal interaction between materials and laser during processing determines the accuracy of simulation results. To acquire desirable simulations results, although various modifications of heat sources in the aspect of absorption process of laser by materials have been purposed, the distribution of laser power density (DLPD) in MHS is still modeled theoretically. However, in the actual situations of laser processing, the DLPD is definitely different from the ideal models. So, it is indispensable to build MHS using actual DLPD to improve the accuracy of simulation results. Besides, an automatic modeling method will be benefit to simplify the tedious pre-processing of simulations. This paper presents a modeling method and corresponding algorithm to model heat source using measured DLPD. This algorithm automatically processes original data to get modeling parameters and provides a step MHS combining with absorption models. Simulations and experiments of heat transfer in steel plates irradiated by laser prove the mothed and the step MHS. Moreover, the investigations of laser induced thermal-crack propagation in glass highlight the signification of modeling heat source based on actual DLPD and demonstrate the enormous application of this method in the simulation of laser processing.

摘要

激光热源模型反应了加工过程中激光对材料的能量作用，是仿真分析模型中的关键部分。该模型精度决定了激光加工仿真结果的准确性。激光热源主要包括作用于材料上的激光能量分布以及材料对能量的吸收两个部分。目前，对于激光热源模型的优化主要集中在吸收过程，而对激光能量分布的描述则采用理想模型。本文提出了一种根据实际激光能量分布自动建立热源模型的方法。该方法将激光能量分布的测试数据转化为灰度图像，并基于图像处理技术获得激光能量分布参数，同时与吸收模型结合，自动建立能够反应实际加工过程中激光能量分布的阶梯式热源模型。激光加热的实验及仿真分析表明，运用阶梯式热源模型能够准确地计算出激光加工过程中的温度场分布，证明了模型及建模方法的正确性。同时，相对于理想热源模型，阶梯式热源模型在激光热裂玻璃的仿真分析中表现出了更高的仿真精度。该建模方法为热源模型的优化提供了新思路。

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Funding

Project(2021YFF0500200) supported by the National Key R&D Program of China; Project(52105437) supported by the National Natural Science Foundation of China; Project(202006120184) supported by the Heilongjiang Provincial Postdoctoral Science Foundation, China; Project(LBH-Z20054) supported by the China Scholarship Council

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Authors and Affiliations

  1. State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, 150001, China

    Gen-wang Wang  (王根旺), Ye Ding  (丁烨), Yan-chao Guan  (管延超), Yang Wang  (王扬) & Li-jun Yang  (杨立军)

  2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Gen-wang Wang  (王根旺), Ye Ding  (丁烨), Yan-chao Guan  (管延超), Yang Wang  (王扬) & Li-jun Yang  (杨立军)

Authors
  1. Gen-wang Wang  (王根旺)
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  2. Ye Ding  (丁烨)
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  3. Yan-chao Guan  (管延超)
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  4. Yang Wang  (王扬)
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  5. Li-jun Yang  (杨立军)
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Correspondence to Yang Wang  (王扬) or Li-jun Yang  (杨立军).

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Contributors

The overarching research goals were developed by WANG Yang and YANG Li-jun. WANG Gen-wang programed the modeling method and performed the experiments and simulations. WANG Gen-wang and DING Ye analyzed the calculated and experimental results. The initial draft of the manuscript was written by WANG Gen-wang, DING Ye and GUAN Yan-chao. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

WANG Gen-wang, DING Ye, GUAN Yan-chao, WANG Yang and YANG Li-jun declare that they have no conflict of interest.

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Wang, Gw., Ding, Y., Guan, Yc. et al. Model heat source using actual distribution of laser power density for simulation of laser processing. J. Cent. South Univ. 29, 3277–3293 (2022). https://doi.org/10.1007/s11771-022-5133-3

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