RECENT DEVELOPMENTS IN THE DESIGN OF THE BLANK IN THREE-DIMENSIONAL DEEP DRAWING

Optimization of process conditions in three-dimensional deep drawing requires the most effective selection of several operating parameters. Among them the initial blank geometry is probably one of the most important: material distribution, in fact, strongly affects the metal flow towards the die cavity and consequently the insurgence of wrinkling, excessive thinning and eventually tearing. Furthermore the use of an improved blank represent a simple and rather inexpensive method to approach the process optimization problem, in particular in comparison with other approaches based, for instance, on variable blank-holder forces during the punch stroke or on the utilization of draw-beads. In the paper an innovative approach based on the integration of finite element simulations and advanced statistical tools is proposed with the aim to determine the most effective blank design in a typical 3-D deep drawing operation.

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