Patent Number: 6,305,210

Title: One-piece can bodies for pressure pack beverage cans

Abstract: Method and apparatus are disclosed for fabricating a one-piece can body, with profiled closed end, from flat rolled steel of selected thickness gauge and tensile strength. Such steel substrate is electrolytically metal plated to facilitate sidewall ironing into an elongated sidewall can body for pressurized beverage packs. An axially-recessed bead is formed in the endwall of a drawn cup by pulling sidewall metal for movement into such endwall. That preformed bead being symmetrically positioned in the drawn cup such that a bodymaker redraw of the drawn cup positions sheet metal of the preformed bead so as to constitute a closed end angled portion, which extends from a circular configuration base support toward contiguous sidewall. Following subsequent sidewall ironing of the bodymaker redrawn cup, a substantially-planar endwall panel, radially inward of such base support, is formed into a concave dome by moving sidewall sheet metal into the closed end of the sidewall ironed can body, thus substantially avoiding thinning of closed end sheet metal and providing desired bulge and implosion resistance. Also, reforming steps for such closed end, subsequent to can body fabrication, are eliminated.

Inventors: Saunders; William T. (late of Weirton, WV), Dalrymple; William H. (Weirton, WV)

Assignee: Weirton Steel Corporation

International Classification: B21D 22/22 (20060101); B21D 22/28 (20060101); B21D 22/20 (20060101); B21D 22/30 (20060101); B21D 51/26 (20060101); B65D 1/22 (20060101); B65D 1/00 (20060101); B65D 1/16 (20060101); B65D 1/26 (20060101); B21D 051/26 ()

Expiration Date: 10/23/2018