Proposition of a new Semantics for Standardized Tolerancing - Principle of its Verification on Coordinate Measuring Machine
Résumé
The semantics of standardized Dimensioning and Tolerancing D&T), that is to say its meaning by relationship to actual surfaces, on one hand renders difficult the synthesis of a functional D&T and on other hand can not be correctly inspected, in particular with the Coordinate Measuring Machines (CMM). We suggest a new semantics for the tolerancing based on the fitting of an envelope surface on the actual surface. We define the envelope surface, in a unique and general way, as being the theoretical surface in contact with the actual surface on the outside of the material and so that the volume between them is minimal. In others terms, we suggest a unique fitting criterion enabling to define the envelope surface and which we call the criterion of minimal volume. We show the interesting properties of this criterion notably from the point of view of its functional interpretation. We present then a method, for the software of CMMs, enabling the calculation of the envelope surface following the suggested criterion. The performances of this method and the obtained numeric result are compared to the two principals fitting criterions used, the least squares criterion and the minimal form defect criterion (again called minimax or schebyscheff criterion).
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Pairel_metro95_NouvelleSemantique_fr.pdf (45.16 Ko)
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Pairel_metro95_NewSemantics_uk.pdf (66.87 Ko)
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Origine | Fichiers produits par l'(les) auteur(s) |
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Format | Autre |
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