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Open AccessArticle

Metal Forming Tool Monitoring Based on a 3D Measuring Endoscope Using CAD Assisted Registration

Insitute of Measurement and Automatic Control, Leibniz University Hannover, Nienburger Straße 17, 30167 Hannover, Germany
Author to whom correspondence should be addressed.
Sensors 2019, 19(9), 2084;
Received: 28 February 2019 / Revised: 29 April 2019 / Accepted: 1 May 2019 / Published: 5 May 2019
(This article belongs to the Special Issue Fiber Optic Sensors and Applications)
PDF [45843 KB, uploaded 5 May 2019]


In order to provide timely, reliable, and comprehensive data for the maintenance of highly stressed geometries in sheet-bulk metal forming tools, this article features a possible setup by combining a 3D measuring endoscope with a two-stage kinematic. The measurement principle is based on the projection of structured light, allowing time-effective measurements of larger areas. To obtain data of proper quality, several hundred measurements are performed which then have to be registered and finally merged into one single point cloud. Factors such as heavy, unwieldy specimens affecting precise alignment. The rotational axes are therefore possibly misaligned and the kinematics and the hand-eye transformation remain uncalibrated. By the use of computer-aided design (CAD) data, registration can be improved, allowing a detailed examination of local features like gear geometries while reducing the sensitivity to detect shape deviations. View Full-Text
Keywords: endoscopy; maintenance; fringe projection; registration; metrology endoscopy; maintenance; fringe projection; registration; metrology

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Hinz, L.; Kästner, M.; Reithmeier, E. Metal Forming Tool Monitoring Based on a 3D Measuring Endoscope Using CAD Assisted Registration. Sensors 2019, 19, 2084.

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