Patent ID: 8341995

Claim:
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 that extends the depth of said cup to said first depth; relatively moving a punch assembly including at least one axial bead punch over said center block in a single operation to: form at least one axial bead in a side wall of said cup; form said cup to have a second depth greater than said first depth and greater than a finished, third depth of said can body; and form said cup to have a step shoulder comprising: 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, wherein a volume of metal at said inwardly tapering annular periphery of said cup is sufficient such that, during the single operation, said at least one axially extending side wall bead is prevented from extending into said step shoulder.