Process and device for extruding hollow sections
US4223548A · kind A · utility
14Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1979 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Mar 14, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C25/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for the extrusion of tubes or similar hollow sections from a billet is disclosed within the billet is forced against a hollow extrusion die surrounding a mandrel and a mandrel support. A core passing through the extrusion billet moves in the direction of extrusion with the billet and is led through the mandrel into the space inside the resultant hollow section. The process of the present invention relieves the die of the high stresses which can otherwise lead to early failure of the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.