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Abstract: Tolerance is used to give the variational extremum for the
real parts and the information can now be added to the parts as text
attributes in three demesional CAD systems. But how to interpret the
information and generate the variational geometry for the parts is still
a difficult task. How to generate the variational geometry for the holes
is systematically analyzed. At first all possible combinations of
tolerance specifications for holes are given. An efficient method for
determining the variational boundary for the hole axis is proposed based
on the given tolerance requirement. A mathematical model for the
generation of variational geometry of the holes is systematically
deduced and the realization approach is developed based on the geometric
modeling kernel-ACIS. An example is given to illustrate the proposed
model.
Key words: Tolerance Variational geometry Holefe ature CAD/CAM
CLC No: TP39.74
国家自然科学基金(60403049)和教育部跨世纪优秀人才培养计划资助项目.
Received 20040621, received in revised form 20050128
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