Method of internally and externally upsetting the end of a metal tube
US5184495A · kind A · utility
34Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1991 |
| Grant date | Feb 9, 1993 |
| Priority date | — |
| Expiry date | Dec 3, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K1/063
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method is disclosed of externally and internally upsetting the end of a steel tube to provide a thicker wall for welding to a tool joint and for providing an internal tapered section having a projected length (Miu) along the longitudinal axis of the tube that substantially exceeds today's API standard upset. The method includes three upsetting steps, one pressing step, and one reheating step after the first two steps of the method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.