New drawbead concepts for sheet metal forming
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New drawbead concepts have been developed which can increase the drawbead restraining force and also allow rapid adjustment of the force. Urethane inserts are added in the groove opposite the bead of a conventional drawbead to increase the deformation and friction. A flat-bottom drawbead design in conjunction with a urethane insert can increase the deformation component about one-third compared to a conventional drawbead. Studies have shown that these new methods can increase the drawbead restraining force of a conventional drawbead up to 20 pct. The flat-bottom drawbead can produce up to 40 pct more force than a comparable conventional drawbead.
KeywordsFriction Force Sheet Metal Urethane Effective Radius Apply Metalworking
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