Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer

A non-transitory computer readable medium storing a control program for a control device of a rolling train, wherein the rolling train has a number of main rolling stands and a coiler arranged downstream of the main rolling stands and the main rolling stands respectively having work rolls and at least backing rolls, the control program comprising machine code which, when executed by the control device, is operable to:

• determine individual pass reductions for the main rolling stands on the basis of data establishing at least an overall pass reduction other than zero by which an initial thickness of the strip is to be reduced in the rolling train,
• control the main rolling stands and the coiler in such a way that the strip is rolled in the main rolling stands in a way corresponding to the individual pass reductions determined and is then coiled up by the coiler,
• determine the individual pass reductions in such a way that the individual pass reduction of the main rolling stand arranged directly upstream of the coiler is zero,
• determine a rolling force for the main rolling stand arranged directly upstream of the coiler that both (a) lies above a lower limit to provide a tension on the outlet side of the particular main rolling stand that is isolated from, and lower than, a tension on the inlet side of the particular main rolling stand and (b) lies below an upper limit such that the strip runs through this main rolling stand without undergoing forming, and
• control the main rolling stand arranged directly upstream of the coiler based on the determined rolling force, and pivot at least one work roll of the main rolling stand arranged directly upstream of the coiler such that the respective rotational axes of at least two work rolls of this main rolling stand are non-parallel to each another, such that the strip runs through this main rolling stand without undergoing forming.

A control device for a rolling train, the rolling train comprising a number of main rolling stands and a coiler arranged downstream of the main rolling stands and the main rolling stands respectively having work rolls and at least backing rolls, the control device being operable to:

• determine individual pass reductions for the main rolling stands to determine the individual pass reductions such that the individual pass reduction of the main rolling stand arranged directly upstream of the coiler is zero,
• control the main rolling stands and the coiler in such a way that the strip is rolled in the main rolling stands in a way corresponding to the individual pass reductions determined and is then coiled up by the coiler, and
• determine a rolling force for the main rolling stand arranged directly upstream of the coiler that both (a) lies above a lower limit to provide a tension on the outlet side of the particular main rolling stand that is isolated from, and lower than, a tension on the inlet side of the particular main rolling stand and (b) lies below an upper limit such that the strip runs through this main rolling stand without undergoing forming, and
• control the main rolling stand arranged directly upstream of the coiler based on the determined rolling force, and pivot at least one work roll of the main rolling stand arranged directly upstream of the coiler such that the respective rotational axes of at least two work rolls of this main rolling stand are non-parallel to each another, such that the strip runs through this main rolling stand without undergoing forming.