Patent ID: 6830419
Filing Date: 2004-12-14
Classification: B21D

Abstract:
A method for forming a domed aerosol can end from a sheet of material in a press having a fixed base and a movable punch assembly, said method comprising the steps of:blanking a workpiece from said sheet of material; holding said workpiece between a blank punch carried by said punch assembly and a draw pad carried by said base; holding said workplace between a knockout carried by said punch assembly and a crown ring carried by said base; advancing said blank punch and said draw pad to form an outer crown lip around the periphery of said workpiece; advancing an outer redraw sleeve, carried by said punch assembly, to form an outer portion of a dome of said domed aerosol can end between said redraw sleeve and a dome form die on said base, said knockout and said crown ring holding said workpiece to control the flow of material into said outer portion of said dome; advancing a dome punch to form an inner portion of said dome with said dome form die, said knockout and said crown ring holding said workplace to control the flow of material into said inner portion of said dome, said outer crown lip shortening in accordance with said flow of material; and collapsing said dome form die to form a crown for said domed aerosol can end.