An Analysis of Draw-Wall Wrinkling in a Stamping Die Design |
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Authors: | F-K Chen Y-C Liao |
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Affiliation: | (1) Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, TW |
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Abstract: | Wrinkling that occurs in the stamping of tapered square cups and stepped rectangular cups is investigated. A common characteristic
of these two types of wrinkling is that the wrinkles are found at the draw wall that is relatively unsup-ported. In the stamping
of a tapered square cup, the effect of process parameters, such as the die gap and blank-holder force, on the occurrence of
wrinkling is examined using finite-element simulations. The simulation results show that the larger the die gap, the more
severe is the wrinkling, and such wrinkling cannot be suppressed by increasing the blank-holder force. In the analysis of
wrinkling that occurred in the stamping of a stepped rectangular cup, an actual production part that has a similar type of
geometry was examined. The wrinkles found at the draw wall are attributed to the unbalanced stretching of the sheet metal
between the punch head and the step edge. An optimum die design for the purpose of eliminating the wrinkles is determined
using finite-element analysis. The good agreement between the simulation results and those observed in the wrinkle-free production
part validates the accuracy of the finite-element analysis, and demonstrates the advantage of using finite-element analysis
for stamping die design. |
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Keywords: | : Draw-wall wrinkle Stamping die Stepped rectangular cup Tapered square cups |
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