Abstract

In this paper, the impact of die manufacturing errors on the drawbead restraining force is studied for straight and curved drawbead systems. The effect of manufacturing errors, including machining and assembly errors, is studied through a finite element analysis (FEA) model. The modeling procedure is validated for a single case by experiments, and compared to the existing drawbead data in the literature. The results indicate that for the curved drawbead system, the restraining force increases with curvature. The restraining force of the curved system is close to the sum of the contributions from an identical straight drawbead system and the metal flow-in deformation of the curved flange. Also, the sensitivity of the restraining force for the curved drawbeads to the machining errors, is similar to that of the straight drawbeads.

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