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CSME 2021/12
Volume 42 No.6
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571-580
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Computer-Aided Sequence Planning for Bending Operations of 3D Sheet Metals with Many Bends in Various Directions
Alan C. Lina and Chao-Fan Chenb
aDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106, ROC.
bGraduate Institute of Automation and Control, National Taiwan University of Science and Technology, Taipei, Taiwan 106, ROC.
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Abstract:
The most complex step in sheet metal production is the bending process, and the planning of a bending sequence directly impacts the feasibility of sheet metal processing. This paper proposes a set of principles to be followed for the planning of bending sequences. It first uses the rule “the more bending lines, the better”to select an appropriate datum plane out of all the possible bending planes of a 3D sheet metal. Based on the selected datum plane, the rule “the smaller angle between bending lines, the better” is applied to divide the sheet metal into a number of bend segments. In the second step, six bending patterns are defined based on the geometric characteristics of various bending operations. Each of the bend segments determined in the first step is then compared with the six bending patterns to obtain a bending sequence for each bend segment. Lastly, the order of the bend segments is arranged by following the principle “minimum-height, first-processed” to obtain the final bending sequence for the entire sheet metal.
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Keywords: CAD, Sheet metal working.
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*Corresponding author; e-mail:
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©
2021
CSME , ISSN 0257-9731
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