VERFAHREN ZUM FORMEN EINES EINTEILIGEN DOSENKOERPERS MIT EINEM ENDENVERSTEIFUNGSRADIUS UND/ODER EINEM STAPELWULST.

摘要

The method comprises forming a cup-shaped blank defined by a cylindrical body, a radius portion and an end, and exerting first forces against the blank in a first direction to form the end into a concavely outwardly opening end defined by a central end panel (CP), a frusto-conical wall and an annular inwardly opening channel merging with the cylindrical body. The method then comprises exerting second forces against the annular channel in a second direction opposite the first direction while gripping the central end panel. The second forces deform a part of the frusto-conical wall in the absence of restraint out of the plane of the central end panel toward the interior of the can (B). This forms an inwardly projecting outwardly opening annular bead. The two directions define a single reciprocal opposing path of force exertion by the forces.