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| Parametric design of a part with free-form surfaces |
| KIM Yeoung-il, KIM Li-ra, JUN Cha-soo |
| Reseach Institute for CAD/CAM, CITEK System, Changwon 641-845, Korea; School of Industrial and Systems Engineering, Gyeongsang National University, Jinju 660-701, Korea; Research Center for Aircraft Parts Technology, School of Industrial and Systems Engineering, Gyeongsang National University, Jinju 660-701, Korea |
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Abstract 3D solid models for parts with regular-form surfaces (PRFSs) are effectively generated using traditional parametric design techniques. A new model is obtained by changing some parameters defining the model. The parts with free-form surfaces (PFFSs), however, cannot be defined by several parameters. Usually they are defined by some geometric elements like profile curves. The traditional parametric design approaches have not easily dealt with the PFFSs. A method for generating a solid model and an engineering drawing for PFFSs is proposed in this paper: First, the new profiles are generated from input point data. Second, the profile information is extracted from the existing model. Last, the old profiles are replaced with the new profiles. This method can preserve the associative information of the existing model and automatically generate the drawing including views, dimensions, and annotations. The proposed method has been implemented using a commercial CAD/CAM system, Unigraphics, and API functions written in C-language, and were applied to the blades of a turbine generator. Some illustrative examples are provided in order to show the effectiveness of the proposed method.
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Received: 20 March 2006
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