Abstract
When drawing non-axissymmetric sheet metal parts it is necessary to control the flow of material between the lower and upper binder in such a manner that prevents the occurrence of both tears and wrinkles in the drawn part. One possibility for the control of the material flow is through the deliberate adjustment of the normal forces. If one can measure the flow-in of the material in the die as a function of punch penetration with a special sensor, and if this information can be used to produce an average empirical desired flow-in curve, then with the implementation of modern hydraulic drawing facilities in the press table and/or the implementation of special dies with hydraulically supported segmented binders it is possible to build a closed-loop control system which allows for the automatic response of the drawing facilities or the hydraulic systems of the drawing die in light of changing friction conditions.
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