汽車鈑件特徵辨識的研究

Feature Recognition of Automobile Sheet Metal from CAD Models

賴孜佑(Tzu-Yu Lai)

指導教授 ： 尤春風

國立臺灣大學/工學院/機械工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.00904

摘要

現今汽車鈑件衝壓工程以人工方式辨識鈑件的特徵。本研究提出多樣化演算法，對於CAD系統所產生的STEP PART42檔案格式之曲面資料進行特徵辨識。
不同於大部份致力於細部鈑金特徵進行之辨識，本研究針對工法排程之需要，將汽車鈑件分成不同的分群，並辨識鈑件之特徵。辨識過程包括建立特徵關係，取得特徵之幾何資料。辨識完成之結果以樹狀圖呈現，並依照特徵協同格式輸出。
大部份汽車鈑件特徵辨識研究並未對主成型面和側成型面進行分群，這是本研究獨特之處。從眾多的曲面資料取出工法排程需要的資訊，是本研究之目標。

關鍵字

特徵辨識 ； 自由曲面特徵 ； 汽車鈑件

並列摘要

Engineers try to recognize the features of automobile sheet metal manually by human today. This thesis is to establish hybrid feature recognition algorithms. The system accesses the CAD model based on STEP PART 42 format to recognize features.
Differing from the previous feature recognition systems which recognize the general feature in sheet metal, this thesis concentrates on the requirement of CAPP. This thesis divides automobile sheet metal into many groups, and recognizes the features into groups. The process of recognition includes building the relationship among features and collecting the necessary geometric data. The system presents the results by the tree data structure and output the text file based on feature protocol.
Besides the general features, this research aims at grouping the main flat and the sub flat. The goal of this research is collecting the feature information from complex surfaces.

並列關鍵字

feature recognition ； freeform surface feature, ； automobile sheet metal

參考文獻

[5] 宋祐禎，汽車鈑金模面建構的二次開發，國立台灣大學碩士論文，中華民國，2008

[1] S. Joshi T C Chang, “Graph Based Heuristics for Recognition of Machined Features from a 3-D Solid Model”, Computer-Aided Design, Vol.20, pp.58-66,1988

[3] J.H. Vandenbrande, A.A.G. Requicha, “Geometric Computation for the Recognition of Spatially Interacting Machinable Features”, Advances in Feature Based Manufacturing, Elsevier Science B.V., The Netherlands, Amsterdam, pp.83-106, 1994

[4] V.B. Sunil, S.S. Pande,“Automatic Recognition of Features from Freeform Surface CAD Models”, Computer-Aided Design, Vol.40, pp.502–517,2008

[8] Bartholomew O.Nnaji, Tzong-Shyan Kang, Shuchieh Yeh, Jang-Ping Chen, “Feature Reasoning for Sheet Metal Components”, International Journal of Production Research, pp.1868-1896, 1991