Extrusion method utilizing variable billet preheat temperature
US5435161A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Oct 22, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C31/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of extruding a plurality of billets. The method includes (a) preheating a billet to a preheat temperature; (b) extruding the billet so that the exit temperature of the extrusion is within a predetermined temperature range; (c) measuring the extrusion pressure during (b); (d) comparing the measured extrusion pressure to a reference pressure range; (e) if the extrusion pressure was below said reference pressure range, resetting the preheat temperature so that it is lowered by a predetermined increment; (f) if the extrusion pressure climbed above the reference pressure range, resetting the preheat temperature so that it is raised by a predetermined increment; (g) preheating another billet to the preheat temperature; and (h) repeating (b)-(g) until all the billets have been extruded. In a preferred embodiment, the billet is formed form an aluminum alloy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.