Abstract
In forming a large automobile sheet metal part in a draw die, a blank is first clamped by curved binders to form a binder wrap. This paper presents a numerical method to calculate the binder wrap. Theanalysis domain, aliaspseudo blank, is the portion of the blank which goes into the die cavity. Since its boundary is not known in advance, an iteration method is used to calculate the pseudo blank and binder wrap simultaneously.
Given a pseudo blank, each iteration cycle consists of two steps: calculation of the binder wrap from the pseudo blank subjected to boundary displacements, and correction of the pseudo blank. Two examples are presented. The calculated results for both examples closely match the measured data. In the first example, correct results were obtained in the initial calculation showing the correctness of the initial selection of the pseudo blank. For the second example, convergent results were obtained in one iteration.
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Chen, K.K. A new finite element method for binder wrap calculations. J. Materials Shaping Technology 5, 107–116 (1987). https://doi.org/10.1007/BF02834809
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DOI: https://doi.org/10.1007/BF02834809