Real-Time Image-Based Feedback Control of Laser Powder Bed Fusion
Real-Time Image-Based Feedback Control of Laser Powder Bed Fusion
复制标题
激光粉床熔合的实时基于图像的反馈控制
DOI：
10.1115/1.4051588
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Rock, Stephen J.
中科院分区：
文献类型：
--
作者：
Shkoruta, Aleksandr;Mishra, Sandipan;Rock, Stephen J.
本文介绍了一种基于图像的金属激光粉末床熔合（LPBF）实时反馈控制系统的设计和实验验证。同轴熔池视频流用于在2kHz下实时控制激光功率。模拟的熔池图像的输入激光功率的变化响应。基于此模型，实时反馈控制器的实验实现了一个单一的跟踪和部分规模。在一个单一的轨道规模，控制器成功地跟踪随时间变化的熔池参考。在零件级规模上，控制器成功地将熔池图像特征调节到所需的参考值，减少层与层之间的信号变化并消除层内信号漂移。
This letter presents the design and experimental validation of a real-time image-based feedback control system for metal laser powder bed fusion (LPBF). A coaxial melt pool video stream is used to control laser power in real-time at 2 kHz. Modeling of the melt pool image response to changes in the input laser power is presented. Based on this identified model, a real-time feedback controller is implemented experimentally on a single track and part scales. On a single-track scale, the controller successfully tracks a time-varying melt pool reference. On a part-level scale, the controller successfully regulates the melt pool image signature to the desired reference value, reducing layer-to-layer signal variation and eliminating within-layer signal drift.