Upper-end formed glass complex for hot expanding piercing and method of manufacturing billet for hot extrusion pipe making
US8327676B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2011 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | May 26, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C23/08
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
When a hollow billet is inserted into a container, and hot expanding piercing is downwardly performed by using a plug, hot piercing is performed by using a formed glass complex comprising a ring-shaped formed glass part and a ring-shaped projecting part. The ring-shaped formed glass part assumes a disc shape having a circular opening for allowing a plug to be inserted at the center thereof. The ring-shaped projecting part is attached to the opening of the ring-shaped formed glass part, and assumes a ring shape projecting perpendicularly to the ring-shaped formed glass part. Thereby, the piercing work can be done safely, and defects can be prevented from occurring on the inner surface of the billet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.