Patent ID: 7661286
Filing Date: 2010-02-16
Classification: B21D

Abstract:
1. A method for the production of a cup-shaped article, from an enameled metal sheet, stepwise in two tools comprising: stamping a blank from the metal sheet in a first tool by a relative motion between a cutting bell cooperating with a blank holder and a drawing block, and the blank is drawn around the drawing block with impingement of force on the blank holder, a width of a flange forming between the cutting bell and the blank holder being continuously reduced with a progressive degree of deformation until the flange has reached a defined width R-r while still remaining pinched between the cuffing bell and blank holder, wherein R is an outer radius of the blank including the flange and r is an inner radius of the blank which does not include the flange, and deforming the blank in a second tool without impingement of force on any blank holder acting on the flange while the flange is deflected toward a profiling introduced in a wall of the blank, wherein the radial width R-r of the flange is essentially less than 3 millimeters.