Flexible constraining apparatus and method for the stretch forming of elongated hollow metal sections
US5349839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Apr 5, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D11/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is apparatus and methods for the stretch forming of an elongated hollow metal section, such as an aluminum extrusion. The apparatus and methods use a flexible constraining means which surrounds at least a portion of the outer periphery of the elongated hollow metal section to constrain and support the walls of the elongated hollow metal section against the forces produced within the interior of the hollow metal section during the reshaping of the extrusion by the stretch forming operation. The apparatus and methods disclosed herein resist wrinkles, crimps and bulges being formed in the walls of the elongated hollow metal section during the stretch forming and reshaping thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.