• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.557-561
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• 1997

In this study, using DEFORM and PAM-STAMP drawbead analysis is carried out for the commercial code availability. The three drawbead types, single circular drawbead, single square drawbead and double circular drawbead, are examined. The clamping force, drawing force and effective strain of sheet metal which is passed by drawbead are checked on each drawbeads.

• Transactions of Materials Processing
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• v.3 no.4
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• pp.454-467
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• 1994

The drawbead restraining forces for the various radius of drawbead and die corner are analyzed by the belt theory, and they are compared with the experimental results. During this procedure, the drawing angles are also varied from $0^{\circ}$ to $60^{\circ}$, and the near part of the drawed die corner are divided into fur steps for the theoretical analysis. The stress distributions through the sheet thickness for these steps are also suggested theoretically. The wide range of experimental data of the drawing forces and strain distributions for the various dimension and blank holding forces are presented. It is concluded that the theoretical assumption for the restraining force analysis is very useful from the comparison with the experimental results.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.8
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• pp.1844-1853
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• 1995

Theoretical and experimental drawing characteristics for the single circular and square drawbeads are discussed. During the blank holding process, the strain distributions of upper and lower skins of specimens, and the die reactional forces are analysed by F. E. M., and they are compared with the experimental results. The drawbead restraining forces and strain distributions for the drawn specimens by the various drawing length are also analysed and compared with the experimental results. It is concluded that the theoretical simulations and results could be very useful for the prediction of real cases.