Closed loop control of slippage during filament transport in molten material extrusion
Closed loop control of slippage during filament transport in molten material extrusion
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DOI：
10.1016/j.addma.2016.12.005
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发表时间：
2017-03-01
影响因子：
11
通讯作者：
Schilling, Meinhard
中科院分区：
文献类型：
--
作者：
Greeff, Gabriel Pieter;Schilling, Meinhard
为了使用开源机器和工具实现功能性3D打印部件，需要研究所有的误差来源。流量控制是通过材料挤出增材制造的零件精度的主要贡献者，因此精确的长丝进料速率至关重要。在这项工作中测量了长丝的滑移。长丝进给齿轮速度和长丝速度之间的速度差通过低成本的自动化设置测量，使用低成本的USB显微镜摄像机和图像处理。还同时测量细丝宽度，从而允许真实的时间体积流速估计。挤出温度和进料速率被发现影响滑移量。值得注意的是，滑动量动态变化，因此不能完全静态校正。还实施了挤出机的概念验证闭环控制，并大大减少了滑动量。(C)2017爱思唯尔B.V.保留所有权利。
In the quest to achieve functional 3D printed parts with open source machines and tools it is required to study all the error sources. Flow control is a major contributor to accuracy of parts manufactured additively with material extrusion and a precise filament feed rate is therefore essential. Filament slippage is measured in this work. The speed difference between filament feed gear speed and filament speed is measured with a cost effective, automated setup, using a low cost USB microscope video camera and image processing. The filament width is also measured simultaneously, allowing for real time volumetric flow rate estimation. Extrusion temperature and feed rate are found to influence the amount of slippage. Significantly, the amount of slippage varies dynamically and therefore cannot be fully corrected for statically. Proof of concept closed loop control of the extruder is also implemented and reduces the amount of slippage considerably. (C) 2017 Elsevier B.V. All rights reserved.