Process for production of draw-ironed can

Abstract

In a process for the production of a draw-ironed can, supposing that at the draw-ironing step, the blank thickness is A, the maximum thickness of the side wall of a cup-shaped body obtained by draw working of the first stage is B and the maximum thickness of the side wall of a cup-shaped body obtained by redraw working of the second stage is C, the increase of thickness B is controlled to up to 20% of thickness A and the increase of thickness C is controlled to up to 30% of thickness A, and supposing that the final thickness of the side wall of the draw-ironed can finally obtained by ironing working is D, the thickness reduction ratio of the side wall of the obtained draw-ironed can satisfies the following requirements: (B-D)/B.times.100.ltoreq.70%, and (C-D)/C.times.100.ltoreq.70%. According to this process, the surface roughness of the final can body is improved, barrel breaking is prevented at the ironing step, and a draw-ironed can having improved necking workability and flanging workability is obtained.

Dependencies are inferred from the claim text.