De Chiffre, Leonardo

Mohaghegh, Kamran

Tiedje, N. S.

Yazdanbakhsh, S.A.

Establishing a reliable measurement procedure for dimensional measurements on green sand molds is a prerequisite for analysis of geometric deviations in mass production of quality castings. Surface of the green sand mold is not suitable for measurements using a tactile coordinate measuring machine (CMM) which is traceable to the meter unit. Optical scanners are increasingly used for dimensional metrology without the risk of damaging the surface, but lack of international standards makes it difficult to establish traceability of their measurements and compare them to tactile instruments. This paper presents a metrological approach for height measurement on green sand molds using an optical 3D scanner with fringe projection. A new sand sample was developed with a hard binder to withstand the contact force of a touch probe, while keeping optical cooperativeness similar to green sand. The sample was calibrated on a dial gage set-up and implemented in optical measurements. The procedure of using calibrated workpieces (ISO 15530-3) was used to determine the uncertainty of optical measurements

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Traceability of Height Measurements on Green Sand Molds using Optical 3D Scanning -DTU Orbit (08/11/2017) Traceability of Height Measurements on Green Sand Molds using Optical 3D ScanningEstablishing a reliable measurement procedure for dimensional measurements on green sand molds is a prerequisite foranalysis of geometric deviations in mass production of quality castings. Surface of the green sand mold is not suitable formeasurements using a tactile coordinate measuring machine (CMM) which is traceable to the meter unit. Optical scannersare increasingly used for dimensional metrology without the risk of damaging the surface, but lack of internationalstandards makes it difficult to establish traceability of their measurements and compare them to tactile instruments. Thispaper presents a metrological approach for height measurement on green sand molds using an optical 3D scanner withfringe projection. A new sand sample was developed with a hard binder to withstand the contact force of a touch probe,while keeping optical cooperativeness similar to green sand. The sample was calibrated on a dial gage set-up andimplemented in optical measurements. The procedure of using calibrated workpieces (ISO 15530-3) was used todetermine the uncertainty of optical measurements. General informationState: PublishedOrganisations: Department of Mechanical Engineering, Department of Applied Mathematics and Computer Science ,Manufacturing Engineering, Technical University of DenmarkAuthors: Mohaghegh, K. (Intern), Yazdanbakhsh, S. (Ekstern), Tiedje, N. S. (Ekstern), De Chiffre, L. (Intern)Number of pages: 8Publication date: 2016 Host publication informationTitle of host publication: Proceedings of the CastExpo & 120th Metalcasting Congress : Proceedings of American FoundrySociety 2016 Publisher: American Foundry SocietyMain Research Area: Technical/natural sciencesConference: CastExpo & 120th Metalcasting Congress, Minneapolis, United States, 16/04/2016 - 16/04/2016Metrology, Green sand, 3D-optical scanning, Measurement uncertainty, Calibrated workpiecesSource: PublicationPreSubmissionSource-ID: 119118112Publication: Research - peer-review › Article in proceedings – Annual report year: 2016 

Traceability of Height Measurements on Green Sand Molds using Optical 3D Scanning

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Traceability of Height Measurements on Green Sand Molds using Optical 3D Scanning

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