Process for manufacturing seamless metal tubes
US4416134A · kind A · utility
7Cited by
3References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Jul 9, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B13/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to the manufacture of seamless metal tubes by a cross-roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked are subjected to outside-diameter reduction by means of a rotary mill having 3 or 4 rolls, without using internal tools such as plug and mandrel bar, so that wall eccentricity is significantly improved, which fact assured higher quality of finished product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.