Information on tolerances and attributes of mechanical parts and assemblies is crucial for many activities in a product’s life cycle. Tolerance design is a complex task because many factors (functional, technological and economical) should be considered. It is an iterative process, starting from a first tolerances assignment and ending with the definition of their optimal values. Once all tolerances have been assigned to each part of an assembly, tolerance analysis is performed. This stage aim is to evaluate if the combined effects of the assigned tolerances let the design requirements be met. Then, feasible and economical aspects are considered on the basis of both available processes and cost evaluations. The whole tolerance design stage is usually defined as tolerance synthesis. The focus of this work is the discussion of the algorithms to model the geometrical variations, of each part of an assembly, allowed by geometric tolerances. This involves the change of the boundary nominal representation of a part face on the basis of the assigned dimensional and geometric tolerances. At present, the developed algorithms are able to simulate flatness, location and orientation. The modified parts, generated by tolerance simulation, may be used to evaluate the overall assemblability and, then, to verify the assembly functional requirements.
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e-mail: giovanni.moroni@polimi.it, www.polimi.it
e-mail: polini@unicas.it, www.unicas.it
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December 2003
Technical Papers
Tolerance-based Variations in Solid Modeling
G. Moroni,
e-mail: giovanni.moroni@polimi.it, www.polimi.it
G. Moroni
Dipartimento di Meccanica, Politecnico di Milano, Milano, 20133, Italy
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W. Polini
e-mail: polini@unicas.it, www.unicas.it
W. Polini
Dipartimento di Ingegneria Industriale, Universita` di Cassino, Cassino, 03043, Italy
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G. Moroni
Dipartimento di Meccanica, Politecnico di Milano, Milano, 20133, Italy
e-mail: giovanni.moroni@polimi.it, www.polimi.it
W. Polini
Dipartimento di Ingegneria Industriale, Universita` di Cassino, Cassino, 03043, Italy
e-mail: polini@unicas.it, www.unicas.it
Contributed by the Computer Aided Product Development (CAPD) Committee for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received October 2002; revised manuscript received October 2003. Associate Editor: B. Wilhelm.
J. Comput. Inf. Sci. Eng. Dec 2003, 3(4): 345-352 (8 pages)
Published Online: December 24, 2003
Article history
Received:
October 1, 2002
Revised:
October 1, 2003
Online:
December 24, 2003
Citation
Moroni, G., and Polini, W. (December 24, 2003). "Tolerance-based Variations in Solid Modeling ." ASME. J. Comput. Inf. Sci. Eng. December 2003; 3(4): 345–352. https://doi.org/10.1115/1.1631581
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