Method and apparatus for forming elongate tubular members into a predetermined shape while extrusion is gas pressurized and product
US4803878A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Jan 20, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D11/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The apparatus forms an elongate tubular member into a predetermined shape while preventing crimping of the walls of the member and comprises jaws for holding the member at its opposing ends and a pressurizer for pressurizing the interior of the member to a predetermined pressure greater than atmospheric pressure while being held sufficient to provide increased effective regidity and crimp resistance to the walls of the member. A die exerts a force against the member sufficient to form the member into a predetermined shape while pressurized. The pressure within the member is released after the member has been formed into its desired shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.