Method for partially annealing the sidewall of a container
US5058408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1991 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Mar 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D26/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention provides a method of bulging at least a portion of a sidewall of a drawn or drawn and ironed aluminum container body. The method involves an initial thermal treatment step prior to bulging. The thermal treatment is provided to that portion of the sidewall of the container that is to be bulged and is sufficient to reduce the yield strength of that portion of the sidewall about 20% without substantially adversely affecting the yield strength of the bottom wall of the container. After thermal treatment, at least a portion of the thermally treated sidewall is bulged at a circumferential strain greater than about 5% to provide container shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.