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Investigating Alignment Effect on Inspection Accuracy of AM Part Using 3D Scanner

机译:使用3D扫描仪研究AM零件检测精度的对准效应

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摘要

Presently, parts having intricate custom-made profiles are mostly fabricated using additive manufacturing (AM) processes. It becomes an essential task to verify the accuracy of AM parts so that they meet customer's need and requirement. In product quality control, quick error comparison of manufactured part and an original CAD model is usually laborious but still a critical issue. Noncontact inspections using 3D scanners were preferred over conventional coordinate measurements, due to the significant amount of point data capturing in very short span of time. One of the important step of the noncontact inspection procedure using the 3D scanner is the correct localization of the datum reference frame. This step would help in the effective alignment of the digitized point data. This paper takes into consideration various 3-2-1 alignment approaches and investigates their influence on the inspection results. The result provides an evidence that an incorrect description of the product reference frame can lead to erroneous estimation of actual part deviations. The results show higher distance distribution for most of the point data of third alignment as the distance distribution is influenced by the worst description of the part reference frame. On the contrary, second alignment shows least distance distribution among point data due to correct reference frame definition.
机译:目前,具有复杂定制型材的部件主要使用添加剂制造(AM)工艺制造。它成为验证AM部件的准确性的重要任务,以便他们满足客户的需求和要求。在产品质量控制中,制造部件和原始CAD模型的快速误差比较通常是费力的,但仍然是一个关键问题。由于在非常短的时间内捕获,因此使用3D扫描仪的非接触检查是优选的通过传统的坐标测量。使用3D扫描仪的非接触检查程序的重要步骤之一是基准参考帧的正确本地化。此步骤将有助于数字化点数据的有效对齐。本文考虑了各种3-2-1对准方法,并调查其对检验结果的影响。结果提供了一种证据,即产品参考帧的错误描述可能导致对实际部分偏差的错误估计。结果显示了距离分布的大多数点数据的距离分布,因为距离分布受部分参考帧的最差描述。相反,第二对准显示了由于正确参考帧定义而导致的点数据之间的距离分布。

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