Primetals Technologies Germany Gmbh

Primetals Technologies Austria Gmbh

Klaus Loehe

Matthias Kurz

Andreas Maierhofer

Daniel Kotzian

Martin Kerschensteiner

Daniel Ott

Mirko Tunk

A control device () for a roll stand (). During rolling of a metal strip () in the roll stand (), the device receives measurement data (M) for a lateral position (y) of the metal strip () on the inlet side and/or outlet side of the roll stand (). Taking into account parameters (P) of the stand regulator () on the basis of the deviation in the lateral position (y) from a target position (y*), a stand regulator () of the control device () determines a tilt value (δs) for the roll stand () and controls the roll stand () accordingly. The control device () determines at least one variable (V, V, Q, Q) from which it is derived, for both strip edges () of the metal strip (), whether the metal strip () forms an undulation () in the region of the particular strip edge (). As soon as the metal strip () forms an undulation () in the region of one of the strip edges (), the control device () varies at least one of the parameters (P) of the stand regulator (), such that the stand regulator () determines the tilt value (δs), starting from the variation in the at least one parameter (P), and taking into account the changed parameter (P).

Preventing undulations when rolling metal strips

Rolling stock () composed of metal is rolled in rolling stands (to) of a roll train () under the control of a control device. The control device, on the basis of a variable (&#x3b4;Q) (which is characteristic of the change in the cross section with which the rolling stock () is supposed to run out of a rolling stand () of the roll train ()), first determines all provisional manipulated variables (Sb to Se) for the rolling stand () and rolling stands (to) located upstream of the rolling stand (), and uses said provisional manipulated variables to determine final manipulated variables (Sb' to Se&#x2032;), which influence the cross section with which the rolling stock () runs out of the respective rolling stand (to). The control device determines the provisional manipulated variables (Sb to Sd) for the upstream rolling stands (to) by frequency filtering.

Frequency-dependent distribution of manipulated variables for changing the rolling stock cross section in a roll train

Slabs pass through a furnace in a conveying direction, are heated to rolling temperature, and are rolled in at least one roller stand. Determining device receives information showing the regions occupied by the slabs relative to one another when passing through the furnace in at least one direction orthogonal to the conveying direction, and determines, for at least one rolling pass of the respective slab, an adjustment of the roller stand performing this rolling pass without prior determination of a respective temperature distribution of a respective slab or without utilization of a determined temperature of a respective slab. The determining device takes into account the region occupied by the respective preceding and/or following slab, seen in the conveying direction, relative to the respective slab, and supplies the respective determined adjustment of the roller stand to a control device, which controls the roller stand when the respective slab is being rolled.

Determination of an adjustment of a roll stand

A control device of the rolling mill line controls actuators of a downstream and an upstream roll stand. The control device determines control variables for the actuators of the upstream roll stand while taking into consideration a flatness change to be carried out and additionally taking into consideration a contour change to be carried out and controls the actuators of the upstream roll stand accordingly. The control device determines control variables for the actuators of the downstream roll stand while taking into consideration the contour change to be performed but without taking into consideration the flatness change to be performed and controls the actuators of the downstream roll stand accordingly. The control device outputs the control variables to the actuators of the downstream roll stand with a delay of a transport time, relative to the corresponding control variables for the actuators of the upstream roll stand.

Growing community of inventors

Fürth, Germany

Klaus Loehe