A CAD/CAM Representation Model Applied to Tolerance Transfer Methods

Author:

Desrochers Alain1

Affiliation:

1. Department of Mechanical Engineering, University of Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada

Abstract

This paper presents the adaptation of tolerance transfer techniques to a model called TTRS for Technologically and Topologically Related Surfaces. According to this model, any three-dimensional part can be represented as a succession of surface associations forming a tree. Additional tolerancing information can be associated to each surface association represented as a node on the tree. This information includes dimensional tolerances as well as tolerance chart values. Rules are then established to infer tolerance chains or stack up along with tolerance charts directly from the graph. This way it becomes possible to combine traditional one dimensional tolerance transfer techniques with a powerful three-dimensional representation model providing high technological contents.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Reference17 articles.

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2. Srikanth, K., Liou, F. W., and Balakrishnan, S. N., 1998, “Automatic Tolerance Assignment Using Fuzzy Logic,” Proceedings of the ASME Design Engineering Technical Conferences, Atlanta, paper DETC98/DAC-5585.

3. Glancy, C. G., and Chase, K. W., 1999, “A Second-Order Method for Assembly Tolerance Analysis,” Proceedings of the ASME Design Engineering Technical Conferences, Las Vegas, paper DETC99/DAC-8707.

4. Adams, J. D., Gerbino, S., and Whitney, D. E., 1999, “Application of Screw Theory to Motion Analysis of Assemblies of Rigid Parts,” Proceedings of the IEEE International Symposium on Assembly and Task Planning, Porto, Portugal, pp. 75–80.

5. Ballot, E., Bourdet, P., and Thie´baut, F., 2001, “Determination of Relative Situations of Parts for Tolerance Computation,” Proceedings of the 7th CIRP International Seminar on Computer Aided Tolerancing, Paris, France, pp. 65–74.

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