Journal of Zhejiang University SCIENCE A
(Monthly)

2006   Vol. 7   No. 11   p. 1810-1818

3DTS: A 3D tolerancing system based on mathematical definition

CAO Yan-long¹, LIU Yu-sheng^†‡2, MAO Jian¹, YANG Jiang-xin¹

(¹Faculty of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China)
(²State Key Lab of CAD & CG, Zhejiang University, Hangzhou 310027, China)
^‡ Corresponding Author
^†E-mail: ysliu@cad.zju.edu.cn
Received Oct. 20, 2005 revision accepted May 21, 2006

Abstract: Tolerance is almost ubiquitous during the whole product lift cycle and is imperative for seamless integration of CAD and CAM. Based on the mathematical definition of tolerance, a 3D tolerancing system, 3DTS, is presented with its design principle, system architecture and key functions. The following functional modules, tolerance modeling, semantics interpretation, 3D tolerance analysis, are described in detail. To make the tolerancing system robust and efficient, many techniques such as hierarchical tolerance representation, rule-based evaluation and non-intersection determination of tolerance zone have been devised. Tested by many samples, this system shows good robustness and practicability.

Key words: Tolerance, Mathematical definition, CAD/CAM
doi:10.1631/jzus.2006.A1810             CLC number: TP391.72.1

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