Method and apparatus for fabricating a can body
AssigneeDayton Reliable Tool & Mfg. Co.
InventorsHenry C. Bachmann, Ermal C. Fraze
Life of this patent
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Abstract
Methods and apparatus are disclosed for fabricating from ductile sheet metal a can body with integral side and bottom walls. A rounded non-circular blank is formed from the sheet metal, the blank having a greater width across the grain of the metal than along such grain. The blank is formed into a cup-shaped receptacle having a bottom and an upstanding wall of not less than the desired internal size of the can body. The wall has a length substantially less than the desired depth of the can body and is substantially thicker than the thickness desired in the finished can body. The wall is then thinned to the desired thickness so as to lengthen the wall to at least the desired depth of the can body.
Claims16
A method of fabricating from ductile sheet metal a can body with an integral bottom wall, comprising the steps of:
- forming a rounded non-circular blank having an outer edge from a sheet of ductile metal, said outer edge being continuously rounded, said blank having a greater width across the grain of the metal than along such grain;
- forming said blank into a cup-shaped receptacle having a bottom wall and a side wall of not less than the desired inside diameter of the can body, said side wall having an axial dimension substantially less than the desired axial dimension of the can body with the side wall of said receptacle substantially thicker than the thickness desired in the finished can body;
- and
- thinning the side wall of said receptacle to the desired thickness of the can body so as to lengthen the side wall in the axial direction to at least the desired axial dimension of the can body.
A method of fabricating from ductile sheet metal a generally cylindrical can body with an integral bottom wall, comprising the steps of:
- forming a rounded non-circular blank having an outer edge from a sheet of ductile metal, said outer edge being continuously rounded, the shape of said blank being defined by a first diameter and at least one additional diameter angularly spaced from said first diameter, said first diameter being aligned with the grain of the metal and being of a length less than said additional diameter;
- forming said blank into a cup-shaped receptacle having a bottom wall and a side wall of not less than the desired inside diameter of the can body, said side wall having an axial dimension substantially less than the desired axial dimension of the can body with the side wall of said receptacle substantially thicker than the thickness desired in the finished can body;
- and
- thinning the side wall of said receptacle to the desired thickness of the can body so as to lengthen the cylindrical wall in the axial direction to at least the desired axial dimension of the can body.
Apparatus for fabricating from ductile sheet metal a can body with integral side and bottom walls, comprising:
- means for forming a rounded non-circular blank having an outer edge from a sheet of ductile metal, with said outer edge being continuously rounded and said blank having a greater width across the grain of the metal than along such grain;
- means for forming said blank into a cup-shaped receptacle having a bottom wall and a side wall of not less than the desired internal size of the can body, said side wall having a length substantially less than the desired depth of the can body with the side wall of said receptacle substantially thicker than the thickness desired in the finished can body;
- and
- means for thinning the side wall of said receptacle to the desired thickness of the can body so as to lengthen the side wall to at least the desired depth of the can body.
Apparatus for fabricating from ductile sheet metal a can body with integral side and bottom walls, comprising:
- means for forming a rounded non-circular blank having an outer edge from a sheet of ductile metal, with said outer edge being continuously rounded and the shape of said blank being defined by a first diameter and at least one additional diameter angularly spaced from said first diameter, said first diameter being aligned with the grain of the metal and being of a length less than said additional diameter;
- means for forming said blank into a cup-shaped receptacle having a bottom wall and a side wall of not less than the desired internal size of the can body, said side wall having a length substantially less than the desired depth of the can body with the side wall of said receptacle substantially thicker than the thickness desired in the finished can body;
- and
- means for thinning the side wall of said receptacle to the desired thickness of the can body so as to lengthen the side wall in the axial direction to at least the desired depth of the can body.
Dependencies are inferred from the claim text.