Development of a modular system to provide confidence in porosity analysis of additively manufactured components using x-ray computed tomography
Development of a modular system to provide confidence in porosity analysis of additively manufactured components using x-ray computed tomography
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DOI：
10.1088/1361-6501/ad1670
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发表时间：
2024-01
影响因子：
2.4
通讯作者：
Y. Chahid;C. Packer;A. Tawfik;J. Keen;N. Brewster;M. Beardsley;K. Morris;P. Bills;
中科院分区：
文献类型：
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作者：
Y. Chahid;C. Packer;A. Tawfik;J. Keen;N. Brewster;M. Beardsley;K. Morris;P. Bills;
X 射线计算机断层扫描 (XCT) 提供了一种很有前景的无损方法来评估用于天基成像的增材制造 (AM) 的高价值组件。然而，AM 组件通常很难测量，而且所用 XCT 系统的真实分辨率很难确定，而且可能会在本地发生变化。为了解决这个问题，我们使用高精度微加工来制造带有内孔的圆柱形参考销。然后，在 XCT 工艺之前，可以通过减材加工将该销钉插入任何组件中。对现有的增材制造挠性件进行了修改，以允许实施我们的模块化系统。这使得类似部件（类似的几何形状和制造工艺）的 XCT 扫描和孔隙率分析可以根据已知的内部微加工孔尺寸进行细化和调整。 XCT 体积数据的分析是使用为 Avizo 2022.1 开发的 Python 脚本实现的，以比较和建议理想的阈值灰度值 (GV)。插件阈值比较是半自动的，比手动比较快 15 倍。研究结果表明，不同的校准微加工孔尺寸 (30 μm–120 μm) 需要不同的阈值 (188 GV–195 GV)。讨论了与建议方法的可追溯性相关的挑战和未来研究。
X-ray computed tomography (XCT) offers a promising non-destructive method to assess high value components that are additively manufactured (AM) for space-based imaging. However, AM components can be often challenging to measure and the true resolution of the XCT system used is both non-trivial to determine and may change locally. To solve this, we used high precision micro-machining to manufacture a cylindrical reference pin with internal holes. This pin can then be inserted into any component via subtractive machining, prior to the XCT process. A pre-existing AM flexure is modified to allow our modular system to be implemented. This allows XCT scanning and porosity analysis of similar components (similar geometry and manufacturing process) to be refined and adjusted based on the known internal micro-machined hole size. Analysis of the XCT volumetric data is implemented using a Python script developed for Avizo 2022.1, to compare and suggest the ideal threshold grey value (GV). The plugin threshold comparison is semi-automatic and 15 times faster than a manual comparison. Study findings showed how different calibrated micro-machined hole sizes (30 μm–120 μm) needed different thresholding values (188 GV–195 GV). Challenges and future studies related to traceability of the suggested method are discussed.