Method for a operating a rolling mill train with curvature recognition

摘要

In a multi-stand rolling mill train, a strip successively runs through individual rolling stands. The strip—always as seen in relation to a rolling center line—is threaded into each of the rolling stands with known respective head offset and inlet-side head pitch, and therefore a strip head emerges with the respective head offset, a respective outlet-side head pitch and a respective outlet-side head curvature. The respective outlet-side head pitch is determined on the basis of respective inlet-side head pitch and pass reduction which takes place in the respective rolling stand. The respective outlet-side head curvature of the strip is determined based on respective measured and further data. The respective outlet-side head curvature is used to determine a respective control intervention for the respective rolling stand and/or the one arranged directly downstream and to drive the corresponding rolling stand in accordance with the respective determined control intervention.

主权项

1. An operating method for a rolling train that has a plurality of rolling stands through which a strip runs successively, comprising the steps of:
threading the strip into each of the rolling stands with a known respective head displacement in a lateral direction parallel to a rotational axis of a roller of a particular rolling stand and a known respective inlet side head pitch, such that a strip head of the strip is outlet from the respective rolling stand with the respective head displacement, a respective outlet side head pitch and a respective outlet side head curvature of the strip in the lateral direction, and for at least one of the rolling stands:
calculating the respective outlet side head pitch based on the respective inlet side head pitch and a respective pass reduction taking place in the respective rolling stand,while rolling the strip through the rolling train, measuring an intermediate stand head displacement of the strip head using a respective position acquisition device arranged between the respective rolling stand and the rolling stand arranged directly downstream of the respective rolling stand,calculating the respective outlet side head curvature of the strip in the lateral direction based on measured intermediate stand head displacement and respective further data,using the calculated respective outlet side head curvature to calculate a respective control intervention for at least one of the respective rolling stand and for a rolling stand arranged directly downstream of the respective rolling stand, anddriving at least one of the respective rolling stand and the rolling stand arranged directly downstream of the respective rolling stand in accordance with the calculated respective control intervention.