Patent ID: 7107810
Filing Date: 2006-09-19
Classification: B21D

Abstract:
1. A method of forming an annular rolled reinforcing rib between a central panel and a chuckwall of an end shell in a single stroke and at a single station of a single action press prior to the removal of the shell from the press, comprising the steps of: blanking and drawing a disc blank having a central panel and a chuckwall terminating in an outer flange; clamping a portion of the chuckwall between a pressure member and a die core ring; forming the rolled reinforcing rib from an unclamped portion of the chuckwall located between the clamped portion and the central panel within an annular void formed between a punch core and the die core ring by advancing the pressure member while maintaining clamping engagement of the central panel between the punch core and a die core, and the portion of the chuckwall between the pressure member and die core ring; and releasing the clamping engagement on the central panel between the punch core and die core prior to or substantially simultaneously with the release of clamping engagement on the chuckwall between the pressure member and die core ring after forming the reinforcing rib.