Characterisation methods for powder bed fusion processed surface topography
Characterisation methods for powder bed fusion processed surface topography
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DOI：
10.1016/j.precisioneng.2018.09.007
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发表时间：
2019-05-01
影响因子：
3.6
通讯作者：
Scott, P. J.
中科院分区：
文献类型：
--
作者：
Lou, S.;Jiang, X.;Scott, P. J.
粉末床熔融（PBF）是一种流行的增材制造（AM）工艺，在航空航天、汽车、医疗保健、国防等关键工业领域有着广泛的应用。然而，PBF的缺点是其表面光洁度低。许多PBF工艺变量和其他因素（例如粉末、重涂器）会影响表面质量。测量和测量PBF表面对于工艺优化、产品性能评估和产品设计具有重要意义。一个国家的最先进的审查，总结了目前的研究工作的AM表面，特别是PBF表面的表征。人们认识到，AM工艺不同于传统的制造工艺，并且它们产生的表面形貌也不同。在本文中，表面表征框架更新，以反映PBF过程的独特特性。描述了表面空间波长分量和其他工艺特征，并阐述了它们的产生机制。一个定制的表面表征程序开发的基础上更新的框架。鲁棒高斯回归滤波器和形态滤波器由于其鲁棒性，被提出用于分离波度分量。增强分水岭分割，从残留表面提取小球。两个AM组件产生的电子束熔化（EBM）和选择性激光熔化（SLM），测量和所提出的方法的特点。这两种过滤器都适用于提取熔化的轨迹。分水岭分割可以实现小球的提取。比较了不同表面波长分量的标准表面织构参数。一组定制的参数是有意开发，以提供一个定量评估的小球。
Powder bed fusion (PBF) is a popular additive manufacturing (AM) process with wide applications in key industrial sectors, including aerospace, automotive, healthcare, defence. However, a deficiency of PBF is its low quality of surface finish. A number of PBF process variables and other factors (e.g. powders, recoater) can influence the surface quality. It is of significant importance to measure and characterise PBF surfaces for the benefits of process optimisation, product performance evaluation and also product design. A state-of-the-art review is given to summarise the current research work on the characterisation of AM surfaces, particularly PBF surfaces. It is recognised that AM processes are different from conventional manufacturing processes and their produced surface topographies are different as well. In this paper, the surface characterisation framework is updated to reflect the unique characteristics of PBF processes. The surface spatial wavelength components and other process signature features are described and their production mechanisms are elaborated. A bespoke surface characterisation procedure is developed based on the updated framework. The robust Gaussian regression filter and the morphological filters are proposed to be used for the separation of the waviness component due to their robustness. The watershed segmentation is enhanced to extract globules from the residual surface. Two AM components produced by electron beam melting (EBM) and selective laser melting (SLM), are measured and characterised by the proposed methodology. Both of the two filters are qualified for the extraction of melted tracks. The watershed segmentation can enable the extraction of globules. The standard surface texture parameters of different surface wavelength components are compared. A set of bespoke parameters are intentionally developed to offer a quantitative evaluation of the globules.