In situ monitoring of material jetting additive manufacturing process via impedance based measurements
In situ monitoring of material jetting additive manufacturing process via impedance based measurements
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DOI：
10.1016/j.addma.2019.05.022
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发表时间：
2019-08
影响因子：
11
通讯作者：
L. Sturm;Mohammed Albakri;P. Tarazaga;C. Williams
中科院分区：
文献类型：
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作者：
L. Sturm;Mohammed Albakri;P. Tarazaga;C. Williams
在本文中，作者探索了使用基于阻抗的监测技术进行增材制造构建缺陷的原位检测。通过将压电陶瓷（PZT）传感器与正在制造的部件物理耦合，PZT的测量电阻抗可以直接与部件的机械阻抗联系起来。假设人们可以通过比较零件打印过程中收集的特征与无缺陷控制样品的特征来检测几何形状或材料性能的原位缺陷。在本文中，作者探讨了嵌入印刷部件的PZT传感器和基于夹具的PZT传感器的层对层灵敏度。对于这项工作，这个概念是在材料喷射的背景下进行评估的。将创建一组控制样本，并使用它们来建立基线签名。（例如，内部空洞）被制造出来，并将它们的层对层特征与控制样本进行比较。使用这种技术，作者展示了跟踪打印进度和检测缺陷的能力。对于嵌入式传感器，缺陷在零件体积的2.28% （95.6 mm3）处可检测到，而对于基于夹具的传感器，缺陷影响了零件体积的1.38%。
In this paper, the authors explore the use of impedance-based monitoring techniques for in-situ detection of additive manufacturing build defects. By physically coupling a piezoceramic (PZT) sensor to the part being fabricated, the measured electrical impedance of the PZT can be directly linked to the mechanical impedance of the part. It is hypothesized that one can detect build defects in geometry or material properties in-situ by comparing the signatures collected during printing of parts with that of a defect-free control sample. In this paper, the authors explore the layer-to-layer sensitivity for both PZT sensors embedded into printed parts and for a fixture-based PZT sensor. For this work, this concept is evaluated in context of material jetting. A set of control samples is created and used to establish a baseline signature. (e.g., internal voids) are fabricated and their layer-to-layer signatures are compared to a control sample. Using this technique, the authors demonstrate an ability to track print progress and detect defects as they occur. For embedded sensors the defects were detectable at 2.28% of the part volume (95.6 mm3) and by fixture-based sensors when it affected 1.38% of the part volume.