Patent ID: 6263718
Filing Date: 2001-07-24
Classification: B21D

Abstract:
Method for ironing a cup with a mandrel having a central axis and comprisinga punch and a ram, during said ironing pushing the cup with the mandrel through several ironing rings, axially aligned with respect to the central axis of the mandrel to form an ironed can body having a wall thickness, the method comprising:selecting a selected wall thickness of said ironed can body;providing a resistive heating means associated with at least one of the punch, the ram and the ironing rings;controlling a gap between the punch and the ironing rings by setting a temperature of at least one of the punch, the ram and the ironing rings, said temperature being set by setting an electrical current in said resistive heating means, said controlled gap corresponding to said selected wall thickness so that the wall thickness of the ironed can body formed by pushing the mandrel through ironing rings corresponds to said selected wall thickness.