Feed forward automatic thickness controlling method
US4220025A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 21, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Nov 21, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B37/64
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a steel rolling mill, (a) a calibration of a thickness in the output side which is calculated from a rolling force at a lock-on position in the present pass is performed depending upon a fluctuation from a predetermined thickness at the lock-on in the last pass, a deformation resistance of a slab and a mill constant; and (b) a constant lock-on level is given to be a predetermined thickness in the present pass as the same with a thickness in the output side given by a plastic characteristic curve of the rolled slab on the predetermined thickness at the lock-on in the last pass and an elastic characteristic curve of a rolling mill on a screw position in the present pass; and then, (c) an adjusting degree of a screw gap of the press-down screw is obtained depending upon the thickness fluctuation from the predetermined thickness in the last pass, the mill constant and a differential coefficient in a rolling load function from the predetermined thickness in the present pass; and (d) the press-down screw position is controlled depending upon the adjusting degree. The press-down screw position is controlled at the position corresponding to the position of the rolled slab in the last pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.