Method and tool for redrawing

B - Operations – Transporting – 21 – D

Patent

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B21D 22/20 (2006.01) B21D 22/30 (2006.01) B21D 24/00 (2006.01)

Patent

CA 1146018

-19 - ABSTRACT In manufacture of a can body by drawing a cup from a blank and subsequently redrawing the cup, one or more redrawing steps are performed by pulling the sidewall of the cup (2) by means of a punch (12) through an S-shaped path (30,24,31), whereby the wall is bent first in one direction and then in the other, to reduce its diameter, which is then reduced further in a convergent portion (20) of the die (10). The bending induces back tensions which stretch the metal and reduce its wall thickness.

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