Practical measurement strategies for verification of freeform surfaces using coordinate measuring machines

• Autorzy: Rajamohan G. , Shunmugam M. S. , Samuel G. L.
• Języki publikacji: EN

Abstrakty

EN

Freeform surfaces have wider engineering applications. Designers use B-splines, Non-Uniform Rational Bsplines, etc. to represent the freeform surfaces in CAD, while the manufacturers employ machines with controllers based on approximating functions or splines. Different errors also creep in during machining operations. Therefore the manufactured freeform surfaces have to be verified for conformance to design specification. Different points on the surface are probed using a coordinate measuring machine and substitute geometry of surface established from the measured points is compared with the design surface. The sampling points are distributed according to different strategies. In the present work, two new strategies of distributing the points on the basis of uniform surface area and dominant points are proposed, considering the geometrical nature of the surfaces. Metrological aspects such as probe contact and margins to be provided along the sides have also been included. The results are discussed in terms of deviation between measured points and substitute surface as well as between design and substitute surfaces, and compared with those obtained with the methods reported in the literature.

Słowa kluczowe

EN

freeform surface; coordinate measuring machine; machining errors; probe size; sampling strategies; substitute geometry

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2011
• Tom: Vol. 18, nr 2
• Strony: 209--222
• Opis fizyczny: Bibliogr. 17 poz., rys., tab., wykr.

Twórcy

autor

Rajamohan G.

autor

Shunmugam M. S.

autor

Samuel G. L.

• Indian Institute of Technology Madras, Department of Mechanical Engineering, , Chennai - 600 036, India,

Bibliografia

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