Method and apparatus for scoring metal panels and resultant product
US5373721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Feb 5, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/383
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of scoring a metal panel such as a can end lid includes forming a first scoreline having a base and a pair of lateral walls and subsequently forming a second scoreline within the first scoreline by indenting a portion of the first scoreline base. The final scoreline may be created by employing two or more scoring operations after the first scoreline has been formed. The apparatus preferably includes a press which supports the first scoring die and second scoring die in such a manner as to establish the desired sequence of scoring operations. This method and associated apparatus provide a scored metal panel or container lid having improved performance characteristics. The resultant lid is characterized by reduced residual strain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.