Patent ID: 6702538
Filing Date: 2004-03-09
Classification: B21D

Abstract:
A method of forming a can end for closing a food can, comprising:(a) providing a die having an annular cut edge having an inner circumferential surface and a punch coaxially disposed with the cut edge; (b) forming a substantially circular metal blank having a periphery and a center panel by cooperation of the punch and cut edge of the die; (c) stamping a seaming panel in the outer periphery of the blank; (d) forming an upwardly-extending annular stiffening bead and a downwardly-extending stiffening bead on the blank radially outward of the center panel; (f) forming a substantially annular recessed panel in the blank radially outward of the beads formed in step (d) with a lift-out lower coin ring so that the recessed panel has a first depth relative to a substantially annular portion of the blank contiguously formed with the recessed panel; and (g) coining the substantially annular portion of the blank with the lift-out lower coin ring while re-forming the recessed panel to a second depth relative to the substantially annular portion of the blank, the second depth being greater than the first depth.