Method for machining extrusion dies
US5997720A · kind A · utility
4Cited by
13References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/60
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a metal honeycomb extrusion die which incorporates apertures for the conveyance of extrudable material through the die body toward a discharge opening in the face of the die, the aperture sidewalls are shaped by electrochemical machining or the like to develop a periodically varying aperture size, surface shape or surface finish, superimposed on the conventional randomly varying machined aperture sidewall surface, in order to reduce the adverse effects of random surface variations on extrusion process stability and extruded product quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.