Endoscopic fringe projection for in-situ inspection of a sheet-bulk metal forming process

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dc.identifier.uri http://dx.doi.org/10.15488/1758
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/1783
dc.contributor.author Matthias, Steffen
dc.contributor.author Kästner, Markus
dc.contributor.author Reithmeier, Eduard
dc.date.accessioned 2017-08-08T08:49:50Z
dc.date.available 2017-08-08T08:49:50Z
dc.date.issued 2015
dc.identifier.citation Matthias, S.; Kästner, M.; Reithmeier, E.: Endoscopic fringe projection for in-situ inspection of a sheet-bulk metal forming process. In: Proceedings of SPIE - The International Society for Optical Engineering 9525 (2015), 952513. DOI: https://doi.org/10.1117/12.2184746
dc.description.abstract Sheet-bulk metal forming is a new production process capable of performing deep-drawing and massive forming steps in a single operation. However, due to the high forming forces of the forming process, continuous process control is required in order to detect wear on the forming tool before production quality is impacted. To be able to measure the geometry of the forming tool in the limited space of forming presses, a new inspection system is being developed within the SFB/TR 73 collaborative research center. In addition to the limited space, the process restricts the amount of time available for inspection. Existing areal optical measurement systems suffer from shadowing when measuring the tool's inner elements, as they cannot be placed in the limited space next to the tool, while tactile measurement systems cannot meet the time restrictions for measuring the areal geometries. The new inspection system uses the fringe projection optical measurement principle to capture areal geometry data from relevant parts of the forming tool in short time. Highresolution image fibers are used to connect the system's compact sensor head to a base unit containing both camera and projector of the fringe projection system, which can be positioned outside of the moving parts of the press. To enable short measurement times, a high intensity laser source is used in the projector in combination with a digital micro-mirror device. Gradient index lenses are featured in the sensor head to allow for a very compact design that can be used in the narrow space above the forming tool inside the press. The sensor head is attached to an extended arm, which also guides the image fibers to the base unit. A rotation stage offers the possibility to capture measurements of different functional elements on the circular forming tool by changing the orientation of the sensor head next to the forming tool. During operation of the press, the arm can be travelled out of the moving parts of the forming press. To further reduce the measurement times of the fringe projection system, the inverse fringe projection principle has been adapted to the system to detect geometry deviations in a single camera image. Challenges arise from vibrations of both the forming machine and the positioning stages, which are transferred via the extended arm to the sensor head. Vibrations interfere with the analysis algorithms of both encoded and inverse fringe projection and thus impair measurement accuracy. To evaluate the impact of vibrations on the endoscopic system, results of measurements of simple geometries under the influence of vibrations are discussed. The effect of vibrations is imitated by displacing the measurement specimen during the measurement with a linear positioning stage. The concept of the new inspection system is presented within the scope of the TR 73 demonstrational sheet-bulk metal forming process. Finally, the capabilities of the endoscopic fringe projection system are shown by measurements of gearing structures on a forming tool compared to a CAD-reference. © 2015 SPIE. eng
dc.description.sponsorship DFG/CRC/TR 73
dc.language.iso eng
dc.publisher Bellingham, WA : S P I E - International Society for Optical Engineering
dc.relation.ispartof Optical Measurement Systems for Industrial Inspection IX, June 22-25 2015, Munich, Germany
dc.relation.ispartofseries Proceedings of SPIE 9525 (2015)
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject Endoscopy eng
dc.subject Fringe Projection eng
dc.subject Inspection eng
dc.subject Metal Forming eng
dc.subject Vibrations eng
dc.subject Cameras eng
dc.subject Computer aided design eng
dc.subject Endoscopy eng
dc.subject Geometry eng
dc.subject Inspection eng
dc.subject Inspection equipment eng
dc.subject Laser mirrors eng
dc.subject Machine tools eng
dc.subject Metal drawing eng
dc.subject Metal forming eng
dc.subject Metals eng
dc.subject Optical data processing eng
dc.subject Optical projectors eng
dc.subject Optical testing eng
dc.subject Optical variables measurement eng
dc.subject Presses (machine tools) eng
dc.subject Projection systems eng
dc.subject Quality control eng
dc.subject Sheet metal eng
dc.subject Vibration analysis eng
dc.subject Collaborative research eng
dc.subject Digital micro-mirror device eng
dc.subject Fringe projection eng
dc.subject Fringe projection system eng
dc.subject High intensity lasers eng
dc.subject Optical measurement systems eng
dc.subject Sheet-Bulk Metal Forming eng
dc.subject Vibrations eng
dc.subject Drawing (forming) eng
dc.subject.ddc 530 | Physik ger
dc.title Endoscopic fringe projection for in-situ inspection of a sheet-bulk metal forming process
dc.type article
dc.type conferenceObject
dc.type Text
dc.relation.issn 0277-786X
dc.relation.doi https://doi.org/10.1117/12.2184746
dc.bibliographicCitation.volume 9525
dc.bibliographicCitation.firstPage 952513
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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