Process for production of draw-ironed can
US5179854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1991 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Mar 13, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/26
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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: EQU (B-D)/B.times.100.ltoreq.70%, and EQU (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.