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Feature Recognition for Freeform Sheet Metal Parts Using Curvature Analysis of NURBS
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ZHANG Chunjie,ZHOU Xionghui,LI Congxin
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(National Die &Mould CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China)
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Abstract This paper presented an approach to recognizing geometric features from freeform surface models of sheet metal parts. It consists of three steps: region segmentation of surfaces, domain independent protrusion/depression detection and recognition of geometric features for sheet metal forming domain. The input geometry data is based on an IGES CAD model and the surface can be represented by trimmed NURBS surfaces. Symbolic computation is used to analyze surface curvature and segment them into curvature regions (CRs). Then sets of connected CRs with particular geometry and topology which have highlevel engineering meanings are recognized as features by a rulebased approach. Two case studies are presented to verify the feasibility of the developed method.
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Received: 04 November 2009
Published: 31 August 2010
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