Comparison of Different Method of Measurement Geometry Using CMM, Optical Scanner and Computed Tomography 3D

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• 作者：Bartosz Gapinski^a ; ^{bartosz.gapinski@put.poznan.pl" class="auth_mail} ; Micha艂 Wieczorowski^a ; Lidia Marciniak-Podsadna^a ; Bogdan Dybala^b ; Grzegorz Ziolkowski^b
• 关键词：3D computed tomography ; X-ray CT ; coordinate metrology ; accuracy of measurement
• 刊名：Procedia Engineering
• 出版年：2014
• 年：2014
• 卷：69
• 期：Complete
• 页码：255-262
• 全文大小：725 K

文摘

Never-ending evolution of market expectations leads to new solutions in quality control. Nowadays, in most cases control of geometry in industry is carried out using devices that apply coordinate measuring technique. Since couple of years metrological computed tomography X-ray 3D has became on a market. It is the latest field of coordinate measuring technique what makes many aspects of its accuracy and possible applications still open. The paper presents information on the functioning and measurement using computed tomography X -ray 3D.

Results of comparative tests carried out on a coordinate measuring machine (CMM), optical scanner, and metrology computed tomography X -ray 3D are presented. The results allow us to conclude that computed tomography makes it possible to obtain comparable results with CMM and the optical scanner. Conducted investigations show areas where the use of the devices is appropriate and those in which the device is not adequate. In the case of X- ray 3D CT considerable versatility is presented which allow to describe the measured part with a cloud of points. Obtained information has an equal density of the part exterior and interior. This allows to reliably assess the test characteristics. The difference in presented results do not exceed 0.05 mm. One of the reasons for them is the method of measurement - for CMM tactile measurement causes information gap between the data points. In the case of the optical scanner is difficult to collect data points in holes of small diameter, what causes errors in the assessment of the position and diameter. For the CT, a significant reduction in the absorption of X-rays, which translates into an actual measurement volume and the occurrence of artefacts. The paper shows the effect of different research methods on the obtained results and their application areas. This information can help a potential user to select the appropriate measuring device.