Abstract
This paper introduces an automation method for the level and the bender control of hot finishing mill process in the steel industry. Additionally its application of the developed system in a steel production line has been explained. The flatness measurement system containing the area cameras and the multi-line laser is designed to measure the strip flatness at the delivery of rolling stand. The flatness data measured by this system stands for the relative elongation rate of each width section of a steel strip. A wave controller is also developed to enhance the strip flatness by adjusting the level and the bender of the rolling stand. The bender deals with symmetrical flatness defects such as edge wave and center buckle, while the level controls asymmetric one side edge wave. The wave controller calculates the optimal compensation of the level and the bender from the flatness data and other operating information. This approach has been applied on a commercial hot rolling process of POSCO, resulting in improving stability and productivity of the production line.
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