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An Algorithm to Speed Up the Rapid Prototyping  

Ko, Min-Suk (아주대학교 산업공학과 대학원)
Chang, Min-Ho (단국대학교 기계공학과)
Wang, Gi-Nam (아주대학교 산업공학과)
Park, Sang-Chul (아주대학교 산업공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.25, no.3, 2008 , pp. 157-164 More about this Journal
Abstract
While developing physical prototype from CAD model, rapid prototyping mainly focuses on two key points reducing time and material consumption. So, we have to change from a traditional solid model to building a hollowed prototype. In this paper, a new method is presented to hollow out solid objects with uniform wall thickness to increase RP efficiency. To achieve uniform wall thickness, it is necessary to generate internal contour by slicing the offset model of an STL model. Due to many difficulties in this method, this paper proposes a new algorithm that computes internal contours computing offset model which is generated from external contour using wall thickness. Proposed method can easily compute the internal contour by slicing the offset surface defined by the sum of circle swept volumes of external contours without actual offset and the circle wept volumes. Internal contour existences are confirmed by using the external point. Presented algorithm uses the 2D geometric algorithm allowing RP implementation more efficient. Various examples have been tested with implementation of the algorithm, and some examples are presented for illustration.
Keywords
RP; Hollowing out; Uniform wall thickness; Circle swept volume; 2D curve offsetting;
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