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

Abstract

A rolling train for rolling a strip (4) has a number of main rolling stands (1, 1') and a coiler (2) arranged downstream of the main rolling stands (1, 1'). The main rolling stands (1, 1') respectively have work rolls (5, 5') and at least backing rolls (6, 6'). Data (d-in, d-out, b, T) of the strip (4), which establish at least an overall pass reduction other than zero by which an initial thickness (d-in) of the strip (4) is to be reduced in the rolling train, are fed to a control device (3) of the rolling train. The control device (3) determines individual pass reductions for the main rollingstands (1, 1') on the basis of the data (d-in, d-out, b, T) fed to it. It controls the main rolling stands (1, 1') and the coiler (2) in such a way that the strip (4) is rolled in the main rolling stands (1, 1') in accordance with the individual pass reductions determined and is then coiled up by the coiler (2). The control device (3) determines the individual pass reductions in such a way that the individual pass reduction of the main rolling stand (1') arranged directly upstream of the coiler (2) is zero. It controls the main rolling stand (1') arranged directly upstream of the coiler (2) in such a way that - with respect to this main rolling stand (1') - the tension (Za) in the strip (4) on the outlet side is less than the tension (Ze) on the inlet side, but the strip (4) runs throughthis main rolling stand (1') without undergoing any forming, at least on one side.

Description

technical field [0001] The invention relates to a method for operating a rolling mill train for rolling strip, in particular metal strip, [0002] - wherein the mill train has a plurality of main rolling stands and a coiler arranged behind the main rolling stands, [0003] - wherein the main rolling mill stand has work rolls and at least backup rolls respectively, [0004] - wherein data of the strip are entered for the control of the rolling train, said data determining at least one total pass reduction by which the initial thickness of the strip should be reduced in the rolling train, which is not equal to zero, [0005] - wherein the control device determines the individual pass reductions for the main rolling stand by means of the data input to the control device, [0006] - wherein the control device controls the main rolling stand and the coiler so that the strip is rolled in the main rolling stand corresponding to the ascertained individual pass reduction and is then ...

AI Technical Summary

Problems solved by technology

In contrast to already existing rolling mill trains, these measures (especially for reasons of space) can only be implemented with difficulty, only with major reconstructions (including the associated costs) or not at all.

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