Press and method of manufacturing a can end

Details Press and method of manufacturing a can end Press and method of manufacturing a can end

2006-10-24

2006-10-24

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

C072S379400

Reexamination Certificate

active

07124613

ABSTRACT:
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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