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An apparatus and method for forming a can end having an annular ridge and a central panel and a can body with a can bottom is provided that exhibits reduced wrinkling in the material used to form the can end and can body. The method of the invention uses a two step doming process wherein material is

An apparatus and method for forming a can end having an annular ridge and a central panel and a can body with a can bottom is provided that exhibits reduced wrinkling in the material used to form the can end and can body. The method of the invention uses a two step doming process wherein material is first drawn or stretched and then held by a punch core ring and then further drawn, stretched or domed and then held by a punch core. The apparatus and method of the invention also 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.

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What is claimed is: 1. 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;

What is claimed is: 1. 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. 2. The method of claim 1, further comprising the step of blanking the material to form a blank. 3. The method of claim 1, further comprising the step of wiping the material over a die core ring with a punch shell. 4. The method of claim 1, further comprising the step of forming an annular ridge at the connection of the first surface and the second surface. 5. The method of claim 1 wherein the upper toolings comprise a punch core, a punch core ring radially outward the punch core and an upper pressure sleeve radially outward the punch core ring and the lower toolings comprise a die core and a die core ring radially outward the die core. 6. The method of claim 1 wherein the upper toolings comprise a punch core, a punch core ring radially outward the punch core, an upper pressure sleeve radially outward the punch core ring and a punch shell radially outward the upper pressure sleeve and the lower toolings comprise a die core, a die core ring radially outward the die core, a lower pressure sleeve radially outward the die core ring and a cut edge radially outward the lower pressure sleeve. 7. The method of claim 1 wherein the apparatus is a double action press. 8. An apparatus for forming a domed can end from material in a doming press assembly, the apparatus comprising: a punch core; a punch core ring concentrically disposed around the punch core and located radially outward from the punch core; an upper pressure sleeve concentrically disposed around the punch core ring and located radially outward from the punch core ring; a die core located in opposed relationship to the punch core and the punch core ring; a die core ring concentrically disposed around the die core and located radially outward from the die core in opposed relationship to the upper pressure sleeve; and a lower piston located above the upper pressure sleeve and radially outward from the punch core ring, wherein the upper pressure sleeve and the die core ring are structured to hold material having a first surface and a second surface therebetween at a radially outward extent of the second surface, wherein the punch core ring is selectively axially actuable and is structured to draw or stretch 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, wherein the punch core ring and the die core ring are structured to hold the material located radially inwardly from the connection of the first surface and the second surface and radially outwardly from the axis, wherein the punch core is structured to draw, stretch or dome the material located radially inwardly from the material that would be drawn or stretched by the punch core ring, wherein the punch core and the die core are structured to hold the material located radially inwardly from the material that would be drawn or stretched by the punch core ring, and 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. 9. The apparatus of claim 8 further comprising a punch shell concentrically disposed around the upper pressure sleeve and located radially outward from the upper pressure sleeve, a lower pressure sleeve concentrically disposed around the die core ring and located radially outward from the die core ring in opposed relationship to the punch shell and a cut edge located radially outward from the lower pressure sleeve. 10. The apparatus of claim 8 wherein the apparatus is a double action press. 11. An apparatus for forming a can end from material in a press assembly, the apparatus comprising: a punch core; a punch core ring concentrically disposed around the punch core and located radially outward from the punch core; an upper pressure sleeve concentrically disposed around the punch core ring and located radially outward from the punch core ring; a die core located in opposed relationship to the punch core and the punch core ring; a die core ring concentrically disposed around the die core and located radially outward from the die core in opposed relationship to the upper pressure sleeve; and a lower piston located above the upper pressure sleeve and radially outward from the punch core ring, and 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. 12. The apparatus of claim 11 wherein the upper pressure sleeve and the die core ring are structured to hold material having a first surface and a second surface therebetween at a radially outward extent of the second surface, wherein the punch core ring is selectively axially actuable and is structured to draw or stretch 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, wherein the punch core ring and the die core ring are structured to hold the material located radially inwardly from the connection of the first surface and the second surface and radially outwardly from the axis, wherein the punch core is structured to draw, stretch or dome the material located radially inwardly from the material that would be drawn or stretched by the punch core ring, and wherein the punch core and the die core are structured to hold the material located radially inwardly from the material that would be drawn or stretched by the punch core ring. 13. The apparatus of claim 11 further comprising a punch shell concentrically disposed around the upper pressure sleeve and located radially outward from the upper pressure sleeve, a lower pressure sleeve concentrically disposed around the die core ring and located radially outward from the die core ring in opposed relationship to the punch shell and a cut edge located radially outward from the lower pressure sleeve. 14. The apparatus of claim 11 wherein the apparatus is a double action press. 15. An apparatus for forming a can end from material in a press assembly, the apparatus comprising: a punch core ring; an upper pressure sleeve concentrically disposed around the punch core ring and located radially outward from the punch core ring; and a lower piston located above the upper pressure sleeve and radially outward from the punch core ring, and 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 actuate the punch core ring. 16. The apparatus of claim 15 wherein the upper pressure sleeve is structured to hold material with a die core ring, the material having a first surface and a second surface therebetween at a radially outward extent of the second surface, wherein the punch core ring is selectively axially actuable and is structured to draw or stretch 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, wherein the punch core ring and the die core ring are structured to hold the material located radially inwardly from the connection of the first surface and the second surface and radially outwardly from the axis, and wherein a punch core is structured to draw, stretch or dome the material located radially inwardly from the material that would be drawn or stretched by the punch core ring, and wherein the punch core and a die core are structured to hold the material located radially inwardly from the material that would be drawn or stretched by the punch core ring. 17. The apparatus of claim 16 further comprising a punch shell concentrically disposed around the upper pressure sleeve and located radially outward from the upper pressure sleeve, a lower pressure sleeve concentrically disposed around the die core ring and located radially outward from the die core ring in opposed relationship to the punch shell and a cut edge located radially outward from the lower pressure sleeve.