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US 2011/0252858 A1Published application
Method for making can bodies having axial ribs and step shoulder bottoms
AssigneeAlfons Haar, Inc.
InventorStephen B. Turner
Life of this patent
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Abstract
A method for forming at least one rib and a step shoulder bottom of a can body in a single drawing operation from a redrawn cup or preform which has a closed end with an inwardly tapering annular periphery that includes sufficient material to enable formation of the step shoulder bottom without having the at least one rib drawn into the step shoulder bottom.
Claims14
A method of making a can body having at least one axial rib and a bottom including a step shoulder, said method comprising:
- placing a cup having a first depth and a closed end over a center block of a redraw die, said closed end of said cup having an inwardly tapering annular periphery;
- relatively moving a punch assembly including at least one axial bead punch over said center block forming at least one axial bead in a side wall of said cup and further:
- forming said cup to have a second depth greater than said first depth and greater than a finished, third depth of said can body;
- and
- forming said cup to have a step shoulder;
- wherein forming said cup to have a step shoulder comprises:
- drawing metal from said inwardly tapering annular periphery of said cup;
- and
- collapsing said cup depth from said second cup depth to said third can body depth, metal drawn from said inwardly tapering annular periphery of said cup and collapsing said cup depth from said second cup depth to said third can body depth being sufficient to prevent said at least one axially extending side wall bead from extending into said step shoulder.
6 more elements
A method of making a can body comprising:
- providing a preform having a first depth and a closed end, said closed end of said preform having an inwardly tapering annular periphery;
- placing said preform on a center block having an end panel die;
- providing a punch assembly having a cavity for receiving said preform on said center block, said punch assembly having at least one axial bead punch in a sidewall of said cavity and an end panel punch;
- relatively moving said punch assembly and said center block so that said preform and center block are received in said cavity;
- relatively moving said punch assembly and said center block toward a bottomed position to draw said preform to form at least one bead in a sidewall thereof and to extend said first depth to a second depth greater than said first depth;
- and
- bottoming said punch assembly and said preform on said center block to form an end panel having a step shoulder by drawing material from said annular periphery of said preform and by collapsing said preform from said second depth to a third depth of said can body.
4 more elements
Dependencies are inferred from the claim text.