Redrawing method

Details Redrawing method Redrawing method

B - Operations, Transporting

21

D

B21D 22/22 (2006.01) B21D 22/20 (2006.01) B21D 22/28 (2006.01)

Patent

CA 2132049

A predrawn can made from a metal sheet coated with an organic film is subjected to a process which reduces its diameter and thins its wall by a high thinning ratio. The thinning is achieved by a blank holder, a redrawing die and an ironing die, the reduction ratio for the ironing die being defined by (see formula I) wherein T2 represents the thickness of the can before ironing and T3 represents the thickness after ironing, wherein the reduction ratio for the ironing die is in the range of 10 to 50%. The wall at the top end portion of the can is maintained thicker than the rest of the can wall.

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