Abstract
In the process of modelling the inner surface of resin parts for an automobile, we have usually offset competent surfaces of the outer model and relied on tedious joining operations to guarantee the integrity of the result. Consequently, considerable amount of manpower has been required for this process.
It is well known that conventional methods based on repetitive offset of component surfaces have weakness of causing geometric deviation from neighbouring surfaces. We believe that the technique of offsetting a whole composite surface, which consists of geometric surfaces representing the object shape and their topological relationship, is highly effective to overcome the weakness. Our investigation, however, shows that no commercial CAD system using this technique has reached a practically satisfactory level in view of numerical stability.
This report presents our own technique that we have developed to overcome the problem and meet the practical requirements. It includes global modification and recognition of topological changes in the offset composite surface. We believe that it has realized automatic modelling of inner surface for specific parts.
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R.Farouki: Exact offset procedures for simple solids. Computer Aided Geometric Design, Vol. 2, No. 4, P. 257–279 (1985)
J.Rossignac, A.Requicha: Offsetting operations in solid modelling. Computer Aided Geometric Design, Vol. 3, No. 2, P. 129–148 (1986)
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© 2001 Springer Science+Business Media New York
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Kawabata, H., Ishida, J. (2001). An Automatic Offsetting Method of Composite Surfaces. In: Kimura, F. (eds) Geometric Modelling. GEO 1998. IFIP — The International Federation for Information Processing, vol 75. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35490-3_18
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DOI: https://doi.org/10.1007/978-0-387-35490-3_18
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-5322-6
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