Freeform shaped parts are of increasing interest in many applications, within the automotive, aerospace, household appliances and other industries, where freeform geometry has a great influence on the performances of a product. They represent challenging measurement tasks for a number of instruments such as coordinate measuring machines, laser trackers, stand still optical systems, interferometric systems and others including X-ray tomography. Tolerance specification and verification in connection with freeform geometries rely on the use of a CAD model, with a number of difficulties related to measurement strategy, registration of multiple views, filtering, alignment and evaluation, Metrological issues related to performance verification and traceability rely on the existence of calibrated workpieces. However, in freeform metrology the main limit of this approach is related to the availability of artefacts with sufficient precision, stability, reasonable cost and sufficiently small calibration uncertainty. There is a clear need for other methods to ensure traceability of measurements on freeform shaped parts. One area that needs attention is software, in terms of both calculation of evaluation parameters and data exchange among design, manufacturing and metrology systems, in which these operations may be a significant error source.
Metrology of freeform shaped parts
Metrologie von Freiformteilen
2007
26 Seiten, 35 Bilder, 2 Tabellen, 197 Quellen
Conference paper
English
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