Method of redrawing a predrawn coated metal can
US5544517A · kind A · utility
16Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Sep 7, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/28
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A predrawn can made of a metal sheet coated with an organic film is subjected to a process which reduces its diameter and thins its walls by a high thinning ratio. The thinning is achieved by a blank holder (1), a redrawing die (3) and an ironing die (4), the reduction ratio for the ironing die being defined by ##EQU1## wherein T.sub.2 equals the thickness of the can before ironing and T.sub.3 equals 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.