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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (10): 1439-1449    DOI: 10.1631/jzus.A0820705
Computer & Automation     
Automatic recognition of intersecting features of freeform sheet metal parts
Chun-jie ZHANG, Xiong-hui ZHOU, Cong-xin LI
National Die and Mold CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China
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Abstract  This paper presents an approach for recognizing both isolated and intersecting geometric features of freeform surface models of parts, for the purpose of automating the process planning of sheet metal forming. The developed methodology has three major steps: subdivision of B-spline surfaces, detection of protrusions and depressions, and recognition of geometric features for sheet metal forming domain. The input geometry data format of the part is based on an IGES CAD surface model represented in the form of trimmed B-spline surfaces. Each surface is classified or subdivided into different curvature regions with the aid of curvature property surfaces obtained by using symbolic computation of B-spline surfaces. Those regions satisfying a particular geometry and topology relation are recognized as protrusion and depression (DP) shapes. The DP shapes are then classified into different geometric features using a rule-based approach. A verified feasibility study of the developed method is also presented.

Key words： Feature recognition (FR)      Freeform surface      Feature intersection      Sheet metal forming     
Received: 11 October 2008     
CLC:  TP391.7  
  TG3  
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Chun-jie ZHANG
Xiong-hui ZHOU
Cong-xin LI
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Chun-jie ZHANG, Xiong-hui ZHOU, Cong-xin LI. Automatic recognition of intersecting features of freeform sheet metal parts. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(10): 1439-1449.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820705     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I10/1439

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