Method and apparatus for eccentricity correction in a rolling mill
US4126027A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1977 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Jun 3, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B37/66
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus is disclosed for eccentricity correction in a rolling mill, in which prior to rolling, the eccentricity of the back-up rolls is measured and recorded both initially and each time the back-up rolls are changed. In an analog loop, constant roll gap is maintained by bidirectionally displacing the back-up rolls so as to maintain constant roll force in accordance with a reference roll force signal, the displacements being such as to neutralize the measured and recorded eccentricity. In a digital feedback loop, controlled by a digital computer, roll force is maintained constant in accordance with changes in the gauge of the work product, with the displacement of the back-up rolls producing a change in roll opening. The analog and digital control loops are cooperatively combined, so that the change in roll opening resulting from digital control, produces a new roll force reference for the analog loop. Effectively then, the intercooperation of analog and digital loops simultaneously produces roll eccentricity and gauge change compensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.