Virtual gauge representation for geometric tolerances in CAD-CAM systems
نویسندگان
چکیده
The CAD software seeks to represent the syntax of the geometric tolerances, i.e. their writing on the drawings. We propose to represent their semantics, i.e. their meaning with respect to the part. We show that the meaning of the geometric tolerances can be defined thanks to a model of virtual gauges. These gauges concern geometrical entities of the part which are represented on the three-dimensional geometrical model of the part (CAD model). The topology of a gauge is related to that of the part. Recording these attributes is sufficient. The advantages of this representation are its simplicity, the semantic coherence which can be guaranteed, the independence from the standards, their limits and their evolutions, and the extension of the tolerancing possibilities for the designer.
منابع مشابه
A Unifying Framework for Tolerance Analysis in Sensing, Design, and Manufacturing - Robotics and Automation, 1995. Proceedings., 1995 IEEE International Conference on
In this work we address the problem of tolerance representation and analysis across the domains of industrial inspection using sensed data, CAD design, and manufacturing. Instead of using geometric primitives in CAD models to define and represent tolerances, we propose the use of stronger methods that are completely based on the manufacturing knowledge for the objects to be inspected. We guide ...
متن کاملFeature-Based Applications in CAD/CAM
With conventional CAD CAM systems, geometric models usually require the elementary part definition data to describe the geometry and topology of the components. For wireframe type of geometric models. the geometric data comprise the vertices and the edges. For surface modellers, the data may include the control points and the corresponding equations for the appropriate surfaces types. For solid...
متن کاملFeature-Based Product Model to Support Automatic Control of Geometrical Tolerances
The growing use of “augmented” virtual product models, which not only represent the geometric information, but also collect attributes, parameters, rules and procedures, can facilitate the digital simulation of many real processes. The control process of manufactured products can take relevant advantage of such technology. In this context, an approach for the automatic virtual inspection of geo...
متن کاملTri-Dexel Volumetric Modeling for Haptic Sculpting and Virtual Prototyping of Complex Surfaces
This paper presents a new tri-dexel volumetric modeling method for representing complex geometric models in applications such as haptic virtual sculpting and product prototyping. A tri-dexel model consists of three overlapping dexel models in X, Y, and Z axis directions, respectively. Detailed algorithms of eliminating inconsistency in a tri-dexel model and reconstructing a water-tight polyhedr...
متن کاملA Unifying Framework for Tolerance Analysis in Sensing, Design, and Manufacturing
In this work we address the problem of tolerance representation and analysis across the domains of industrial inspection using sensed data, CAD design, and manufacturing. Instead of using geometric primitives in CAD models to define and represent tolerances, we propose the use of stronger methods that are completely based on the manufacturing knowledge for the objects to be inspected. We guide ...
متن کامل