Extrusion die for forming hollow material
US9162267B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 2, 2012 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Aug 2, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C25/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An extrusion die is provided with a male die through which a billet is extruded from an upstream side to a downstream side and, the male die adapted for forming an inside shape of a hollow material; and a female die for holding the male die and forming an outside shape of the hollow material. The male die is formed of a spider and a holder for holding the spider. The spider is formed of a mandrel and a plurality of bridge parts for supporting the mandrel, and enabling a distal-end outer peripheral surface to engage with a bridge-holding surface. The distal-end outer peripheral surface of each of the bridge parts and the bridge-holding surface of the holder are joined by shrink-fitting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.