The search for higher and higher performance is pushing part geometry to increased complexity. A significant contribution to this trend has been given by the diffusion of additive manufacturing technologies: substituting a simple additive manufacturing part with a complex one does not significantly affect the production cost. The diffusion of complex geometries has made geometric inspection more and more complicated. However, in recent years a new technique for geometric verification has emerged, which is not affected by the complexity of the geometry: X-Ray Computed Tomography (XCT). XCT substitutes the point probing of geometric metrology with a volumetric scan of the X-Ray absorption of the material. As the whole volume is (even internally) scanned without any accessibility issue, complex geometries are easily acquired. Even if XCT is totally flexible, this does not mean it can scan any geometry with the same degree of accuracy. In many cases, the part can be measured but the required degree of accuracy cannot be reached. In this work we will try to highlight which are the geometries the most suitable for XCT scanning. This can serve as guide to design parts which can be easily measured by XCT, and simultaneously avoid the generation of scan defects and artifacts which could negatively affect the measurement result. These indications can also serve as an input to develop new rules for topological optimization software.

Design for X-Ray Computed Tomography

Moroni, Giovanni;Petrò, Stefano
2019

Abstract

The search for higher and higher performance is pushing part geometry to increased complexity. A significant contribution to this trend has been given by the diffusion of additive manufacturing technologies: substituting a simple additive manufacturing part with a complex one does not significantly affect the production cost. The diffusion of complex geometries has made geometric inspection more and more complicated. However, in recent years a new technique for geometric verification has emerged, which is not affected by the complexity of the geometry: X-Ray Computed Tomography (XCT). XCT substitutes the point probing of geometric metrology with a volumetric scan of the X-Ray absorption of the material. As the whole volume is (even internally) scanned without any accessibility issue, complex geometries are easily acquired. Even if XCT is totally flexible, this does not mean it can scan any geometry with the same degree of accuracy. In many cases, the part can be measured but the required degree of accuracy cannot be reached. In this work we will try to highlight which are the geometries the most suitable for XCT scanning. This can serve as guide to design parts which can be easily measured by XCT, and simultaneously avoid the generation of scan defects and artifacts which could negatively affect the measurement result. These indications can also serve as an input to develop new rules for topological optimization software.
Proceedings of the 29th CIRP Design Conference
PROCEDIA CIRP
Design for Metrology, Geometric Verification, X-Ray Computed Tomography
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1103953
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