Fabricating one-piece can bodies with controlled side wall elongation
US5343729A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1990 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Oct 12, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D1/26
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
New technology for fabricating a one-piece cup-shaped can body having a protective organic coating as formed. Such can body is formed free of side wall ironing from can stock comprising flat-rolled sheet metal substrate precoated with protective organic coating and forming lubricant. A plurality of successive diameter-reduction operations are carried out on a planar blank and cup-shaped work product under tension during which side wall height is increased and side wall substrate is decreased in thickness to provide controlled uniformity in side wall substrate thickness over about 85% to about 95% of side wall height for such can body. The fabricating tooling provides for a preselected clearance between a punch peripheral wall and a die cavity internal wall in each of such plurality of diameter-reduction operations to achieve a desired decrease in side wall thickness as the precoated substrate is moved into a die cavity by relative movement of its respective punch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.