X-Ray Computed Tomography Applied as a Comprehensive Technique for Material Analysis and Dimensional Measurement of Metallic Parts

2014 ◽  
Vol 613 ◽  
pp. 335-343 ◽  
Author(s):  
Diogo Cesar Borges Silva ◽  
Crhistian Raffaelo Baldo
Keyword(s):  
Computed Tomography ◽  
Quality Control ◽  
Point Of View ◽  
Dimensional Metrology ◽  
Material Quality ◽  
X Ray ◽  
Internal Structures ◽  
Quality Control Tool ◽  
X Ray Computed ◽  
Metallic Parts

X-ray computed tomography, first conceived to image internal structures of the human body, has become an important metrology technique for material quality control and dimensional quality control. As a material quality control tool, discontinuities, cracks and voids can be detected without physically destroying or damage the sample under analysis. As a dimensional metrology technique, the complete examination in a non-destructive manner of inner and outer geometries of parts and components has become possible. In this paper, material investigation of connecting rods manufactured through both casting and forging processes and dimensional evaluation of intricate geometries found on connecting rods are described and discussed from the metrology point of view.

Seeing through Corrosion: Using Micro-focus X-ray Computed Tomography and Neutron Computed Tomography to Digitally “Clean” Ancient Bronze Coins

2011 ◽  
Vol 1319 ◽  
Author(s):  
Hai-Yen Nguyen ◽  
Steven Keating ◽  
George Bevan ◽  
Alexander Gabov ◽  
Mark Daymond ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Point Of View ◽  
Archaeological Sites ◽  
X Ray ◽  
Surface Features ◽  
Original Surface ◽  
Roman World ◽  
Greco Roman ◽  
X Ray Computed ◽  
Mechanical Cleaning

ABSTRACTVast numbers of bronze coins have been, and continue to be, excavated from archaeological sites around the Greco-Roman world. While often of little value from a strictly numismatic point of view, these coins provide invaluable data within their respective stratigraphic contexts and are used to date occupational and architectural phases more precisely than by ceramics alone. Unfortunately, the build-up of corrosion and mineralization on these coins during their centuries of burial often obscures their legends. Rather than employing potentially destructive and time-consuming chemical or mechanical cleaning techniques to reveal these features, commercially available Micro-focus X-Ray CT systems are now sufficiently well developed to reveal original surface features and to permit identification by a trained numismatist without any cleaning at all.

scholarly journals OBSERVATIONS ON THE PERFORMANCE OF X-RAY COMPUTED TOMOGRAPHY FOR DIMENSIONAL METROLOGY

2016 ◽  
Vol XLI-B5 ◽  
pp. 25-31
Author(s):  
H. C. Corcoran ◽  
S. B. Brown ◽  
S. Robson ◽  
R. D. Speller ◽  
M. B. McCarthy
Keyword(s):  
Computed Tomography ◽  
Reverse Engineering ◽  
X Rays ◽  
Dimensional Metrology ◽  
Beam Hardening ◽  
X Ray ◽  
Accuracy And Precision ◽  
Dimensional Measurements ◽  
X Ray Computed

X-ray computed tomography (XCT) is a rising technology within many industries and sectors with a demand for dimensional metrology, defect, void analysis and reverse engineering. There are many variables that can affect the dimensional metrology of objects imaged using XCT, this paper focusses on the effects of beam hardening due to the orientation of the workpiece, in this case a holeplate, and the volume of material the X-rays travel through. Measurements discussed include unidirectional and bidirectional dimensions, radii of cylinders, fit point deviations of the fitted shapes and cylindricity. Results indicate that accuracy and precision of these dimensional measurements are affected in varying amounts, both by the amount of material the X-rays have travelled through and the orientation of the object.

X-ray computed tomography: from medical imaging to dimensional metrology

2019 ◽  
Vol 60 ◽  
pp. 544-569 ◽  
Author(s):  
Herminso Villarraga-Gómez ◽  
Ericka L. Herazo ◽  
Stuart T. Smith
Keyword(s):  
Computed Tomography ◽  
Medical Imaging ◽  
Dimensional Metrology ◽  
X Ray ◽  
X Ray Computed

Determination of the Interface Structural Resolution of an Industrial X-Ray Computed Tomograph Using a Spherical Specimen and a Gap Specimen Consisting of Gauge Blocks

2021 ◽  
Vol 883 ◽  
pp. 41-48
Author(s):  
Matthias Busch ◽  
Tino Hausotte
Keyword(s):  
Computed Tomography ◽  
Contact Point ◽  
Ideal Point ◽  
Point Contact ◽  
Volumetric Analysis ◽  
Dimensional Metrology ◽  
Destructive Testing ◽  
X Ray ◽  
X Ray Computed

Industrial X-ray computed tomography (XCT) is a tool for non-destructive testing and a volumetric analysis method with the ability to measure dimensions and geometry inside a component without destroying it. However, XCT is a relatively young technology in the field of dimensional metrology and thus faces several challenges. The achievement of a high measurement resolution, which is re-quired to detect small geometrical features, depends on a variety of influencing factors. In this arti-cle, the interface structural resolution (ISR) as one of the key challenges will be investigated. The two-sphere standard called the hourglass standard allows the determination of the structural resolu-tion by evaluation of the surrounding area of an ideal point contact of two spheres after the CT re-construction in form of a neck-shaped transition. Close to the contact point of the two spheres two opposing surfaces exist. Their distances from each other increase as the distance from the contact point of the two spheres increase. The determination of the distances between the spheres’ surface allows a statement about the ISR. A new developed specimen or standard with a variable gap size consisting of calibrated parallel gauge blocks allows statements about the ISR, too. Because of the higher number of probing points of the gauge block standard the results of the determined ISR are more stable compared to the hourglass standard. This paper compares the results of the computed tomography measurements for the designed interface structural resolution standard with those of the hourglass standard.

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