Method of forming a metal container body
AssigneeAluminum Company of America
InventorsHans H. Diekhoff, George L. Smith, Jr.
Life of this patent
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Abstract
A method of forming a drawn metal cup for a container body which includes drawing a cup having a circular boss in its base wall, redrawing the cup and forming a pressure resistant profile in its base wall.
Claims9
A method of forming a drawn metal cup comprising drawing a metal cup having a sidewall and a base wall with an upwardly projecting cylindrical boss in the base wall, said boss having a transverse wall offset inwardly with respect to said base wall and an annular wall portion adjacent the sidewall of the cup, and reforming said base wall by rolling the metal in said annular wall upwardly with respect to said transverse wall to form a generally frusto-conical annular wall portion between said transverse wall and said sidewall.
A method of forming a metal can body, comprising:
- drawing a cup having a sidewall and a base wall with an inwardly projecting cylindrical boss therein having a transverse wall offset with respect to said base wall and an annular wall connecting said transverse wall and said base wall adjacent the sidewall of the cup;
- redrawing the cup to reduce its diameter,
- reforming said annular wall into a frusto-conical wall portion extending downwardly and inwardly from the sidewall to said base wall;
- ironing said sidewall to reduce its thickness;
- and
- forming an upwardly projecting dome in said base wall.
A method of forming a metal container body which comprises:
- drawing a metal cup having a sidewall and a base wall which includes a central transverse wall portion, a generally cylindrical annular wall portion around said central wall portion and connected to an outer peripheral wall portion which is offset with respect to said transverse wall portion;
- and
- redrawing said metal cup to reform said annular wall portion into a frusto-conical wall portion between said central wall portion and the sidewall of the redrawn cup.
Dependencies are inferred from the claim text.