Abstract
A multiple-action hydraulic sheet metal strip drawing test device has been constructed for the purpose of studying the effectiveness of feedback controls in sheet metal forming. The apparatus simulates the flow of sheet metal in the blankholder and over the die shoulder during the stamping of sheet metal panels. Its special features consist of the ability to adjust both blankholder force and drawbead penetration while the strip is being drawn. A force transducer was developed to measure the forces in the sheet on either side of the die shoulder. Measurements from this unique transducer determine both the drawbead restraining force in the simulator and friction between the sheet and the die shoulder. Data demonstrating the capabilities of the equipment are presented.
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