Method and apparatus for elongating metal tubes by means of a mandrel mill
US5501091A · kind A · utility
12Cited by
0References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1993 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Nov 23, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B25/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a method of elongating a metal tube by means of a mandrel mill, a tapered mandrel bar is inserted into a hollow piece and the feeding speed of the mandrel bar is controlled so as to change the length by which the mandrel bar projects beyond the delivery end of the final stand of the mandrel mill at the point of time when the leading end of the hollow shell is gripped by the rolls in the final stand. As a result, the wall thickness of the hollow shell is altered to permit the rolling of hollow shells of many sizes with different wall thicknesses using a single mandrel bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.