Method and device for forming a tapered extrusion die
US4350865A · kind A · utility
9Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Sep 21, 1982 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23H9/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and tool for making an extrusion die wherein the extrusion has a lobed helical outer contour. An electrical discharge machining electrode has an identical outer contour. Mounted integrally with the electrode is a lead bar having a guide recess that makes a second helix angle with respect to the axis of the electrode. A guide pin fixedly mounted with respect to the moving assembly is located within the recess. Axial movement and rotation of the electrode through the die blank is controlled by the pin and recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.