用于定向能量沉积的粉末质量流率的实时声发射监测
Real-time acoustic emission monitoring of powder mass flow rate for directed energy deposition.
作者信息
Whiting Justin, Springer Adam, Sciammarella Federico
机构信息
Engineering Laboratory, National Instituteof Standards and Technology, Gaithersburg, MD 20899, USA.
Department of Mechanical Engineering, Northern Illinois University, DeKalb, IL 60115, USA.
出版信息
Addit Manuf. 2018;23. doi: 10.1016/j.addma.2018.08.015.
In order to ensure a reliable and repeatable additive manufacturing process, the material delivery rate in the directed energy deposition (DED) process requires in situ monitoring and control. This paper demonstrates acoustic emission (AE) sensing as a method of monitoring the flow of powder feedstock in a powder fed DED process. With minimal calibration, this signal closely correlates to the actual mass flow rate. This article describes the fabricated mass flow monitoring system, documents various conditions in which the actual flow rate deviates from its set value, and details situations that highlight the system's utility. While AE mass flow monitoring is not free of concerns, its features make it an attractive measurement technique in the powder-fed DED process. The work presented here highlights the results obtained and illustrates that accurate monitoring of powder flow in real-time regardless of environmental conditions within the build chamber is possible.
为确保增材制造过程可靠且可重复，定向能量沉积（DED）过程中的材料输送速率需要进行原位监测和控制。本文展示了声发射（AE）传感作为一种监测粉末送料DED过程中粉末原料流动的方法。只需进行最少的校准，该信号就与实际质量流率密切相关。本文描述了所制造的质量流监测系统，记录了实际流速偏离设定值的各种情况，并详细说明了突出该系统实用性的情形。虽然AE质量流监测并非毫无问题，但其特性使其成为粉末送料DED过程中一种有吸引力的测量技术。此处展示的工作突出了所获得的结果，并表明无论成型腔内的环境条件如何，都能够实时准确监测粉末流动。
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