Identification of Multiple Feature Representations by Volume Decomposition for 2.5-Dimensional Components

[+] Author and Article Information
V. Sundararajan, Paul K. Wright

Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720

J. Manuf. Sci. Eng 122(1), 280-290 (May 01, 1999) (11 pages) doi:10.1115/1.538905 History: Received December 01, 1997; Revised May 01, 1999
Copyright © 2000 by ASME
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Outline of the feature recognition  
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Algorithm for preprocessing
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Classification of faces of the original part
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Feature generation for individual access direction
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Result of preprocessing in X
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Starting face in the +X direction
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Detail working of algorithm for the +X direction
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Detection of “through” features
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Obtaining faces of features that have already been recognized
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Synthesizing alternate views of features
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Generating the first feature from the −Y direction
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Actual generation of multiple representations
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Undesirable result of covering the hole to prevent recognition from the other side
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Parts manufactured with features from the recognizer. (a) CAD model of example component 1. (b) Manufactured example 1. (c) Results for example component 1. (d) CAD model of example component 2. (e) Manufactured example component 2. (f ) Results for example component 2.
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Final output of the program. (a) Notation for features: Fji is the jth feature from the direction i (i=0 for +X,i=1 for −X,i=2 for +Y,i=3 for −Y,i=4 for +Z, and i=5 for −Z). (b) Volumes denote the features. The shaded faces of the features are the contours identified by the recognizer. (c) The thick edges represent open edges on the contour. (d) Thick arrows between features with the same access direction denote depth sorting. (e) Arcs between features with different access direction imply that these features share volumes and are thus alternate representations of the same material-removal volume. (f ) If there are no features from a certain direction (such as the −Z direction in the above example), it is denoted as ϕ.




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