Simple Interim Check of Measuring Performance for X-Ray Computed Tomography Used as Coordinate Measuring System
Osamu Sato, Hiroyuki Fujimoto, Sonko Osawa, Makoto Abe, and Toshiyuki Takatsuji
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST)
1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
Form and dimension measurements using X-ray computed tomography (X-ray CT) are useful in product development, reverse engineering, production control and quality certification. This is because X-ray CT systems can get three-dimensional 3D volumetric data on the full body of the target object all at once. The measurement space of 3D coordinate measuring systems (CMSs), which include X-ray CTs, are distorted by kinematic and other factors. This means that measurement space deformation should be compensated for precise dimensional measurement. The compensation function should also be occasionally checked. For the widely-used coordinate measuring machine (CMM), the mobile frame is stable over a long period, making it unnecessary to check whether the compensation function works well or not on the CMM. The mobile frame of the X-ray CT is less stable than that of a CMM, so the space deformation compensation function on X-ray CTs should be checked more often than that on CMMs to perform precise dimensional measurement using X-ray CTs. We propose a simple interim check method for an X-ray CT that is through repeated checking, assesses the long-term stability of the mobile frame of the X-ray CT.
-  J. Kruth, M. Bartscher, S. Carmignato, R. Schmitt, L. DeChiffre, and A. Weckenmann, “Computed tomography for dimensional metrology,” CIRP Annals – Manufacturing Technology, Vol.60, pp. 821-842, 2011.
-  ISO10360-2ISO 10360-2:2009, “Geometrical product specifications (GPS) – Acceptance and reverification tests for coordinate measuring machines (CMM) – Part 2: CMMs used for measuring linear dimensions,” 2009.
-  H. Kunzmann, E. Trapet, and F. W”aldele, “A Uniform Concept for Calibration, Acceptance Test, and Periodic Inspection of Coordinate Measuring Machines Using Reference Objects,” CIRP Annals – Manufacturing Technology, Vol.39, pp. 561-564, 1990.
-  A. Weckenmann and J. Lorz, “Monitoring coordinate measuring machines by calibrated parts,” J. of Physics: Conference Series, Vol.13, pp. 190-193, 2005.
-  V. Nardelli and G. Donatelli, “A simple solution to interim check of coordinate measuring machines,” Proc. XVIII IMEKO WORLD CONGRESS, Rio de Janeiro, Brazil, Sep. 2006.
-  R. Furutani, T. Itabashi, and M. Ozaki, “Comparison of daily check artefacts of CMM,” Proc. 11th Int. Symposium on Measurement and Quality Control 2013, Cracow-Kielce, Poland, Sep. 2013.
-  http://www.renishaw.com/en/mcg-systems–6674 [Accessed August 24, 2015]
-  Trapet_Precision http://trapet.de/en/3d%20artefacts.html [Accessed August 24, 2015]
-  K. Kiekens, F. Welkenhuyzen, T. Tan, P. Bleys, A. Voet, W. Dewulf, and J. P. Kruth, “A test object for calibration and accuracy assessment in X-ray CT metrology,” Proc. 10th Int. Symposium on Measurement and Quality Control 2010, Osaka, Japan, Sep. 2010.
-  P. Müuller, “Coordinate metrology by traceable computed tomography,” Ph.D. Thesis, Technical University of Denmark, 2012.
This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.