Laser measurement systems for plate mills - flatness, plate geometry, thickness and length measurement at Baoshan Iron & Steel Group, Co. Ltd., China

Flatness measurement with LAP LevellerCheck behind hot leveller.

Measurement of flatness after levelling allows optimal setting of the hot leveller. Immediately after the passing of a plate the levelling result is available for evaluation and the plate levelling can be repeated if needed. The leveller setting can therefore also be optimized for the following plates and the flatness results will be used to permanently optimize the control model of the rolling train.

The plate flatness is measured in 11 tracks across the plate width by the LAP LevellerCheck. A speed signal from the leveller is used to allocate the crossprofiles along the plate length. Combining subsequent cross-profiles yields the flatness information. This information is graphically displayed in the control pulpit of the leveller as I-Units, as longitudinal and transversal profiles, as well as colored topographical maps.