Patent ID: 7124613

Claim:
A method for forming a domed can end from material in a doming press assembly, in an apparatus with one or a multiplicity of doming press assemblies, comprising the steps of: i) moving the material into the assembly between a set of upper toolings and a set of lower toolings; ii) providing the material with a first surface connected to a second surface; iii) holding the material at a radially outward area of the second surface; iv) drawing or stretching the material located radially inwardly from the connection of the first surface and the second surface and radially outwardly from an axis that passes through a center of the second surface of the material; v) holding the drawn or stretched material at the location of the material that was drawn or stretched in step iv) in a pressure relationship; vi) drawing, stretching or doming the material located radially inwardly from the location of the material drawn or stretched in step iv); and vii) holding the drawn, stretched or domed material at the location of the material that was drawn, stretched or domed in step vi) in a pressure relationship, and wherein the upper toolings include a lower piston located above an upper pressure sleeve and radially outward from a punch core ring wherein the lower piston has a bore and the lower piston, punch core ring and upper pressure sleeve define a gap to which pressurized gas may be supplied through the bore to selectively axially actuate the punch core ring.