Primetals Technologies Germany Gmbh

Ilhom Gafur

Andreas Lorenz

Anastasiia Galkina

Kurt Schlacher

When the strip head () of a metal strip () runs out of a roll stand (), a lateral position (y) of the strip head () is detected by a detection device () at at least one location (P) lying between the roll stand () and a device () arranged downstream of the roll stand. A strip position controller () is designed as a model predictive controller which ascertains a sequence of adjusting commands (u) to be output one after the other in a work cycle (T) on the basis of the detected lateral position (y) of the strip head (), and the sequence is used to adjust a respective roll gap wedge. The number of control commands (u) define a prediction horizon (PH) of the strip position controller () in connection with the work cycle (T). The strip position controller () at least supplies the roll stand () with the control command (u) ascertained to be output next.

Model predictive strip position controller

A hydraulic cylinder unit (1) having a hydraulic cylinder (2), a piston (3) which can be moved in the hydraulic cylinder (2), and a servo valve (7). The piston (3) separates working volumes (5A, 5B) of the hydraulic cylinder unit (1) from one another. The servo valve (7) is connected to a hydraulic pump (8), a tank (9), and the working volumes (5A, 5B). The servo valve (7) is supplied with a pump pressure (pP) via the hydraulic pump (8). The tank (9) has a tank pressure (pT). The servo valve (7) is adjusted to a defined valve position (y). A piston position (z) of the piston (3) in the hydraulic cylinder (2) and working pressures (pA, pB) which are applied to the working volumes (5A, 5B) are detected. An analysis device (12) ascertains a leakage coefficient (&#x3c9;) of the hydraulic cylinder unit (1) using the piston position (z), the working pressures (pA,pB), the valve position (y), the pump pressure (pP), and a value which represents the tank pressure (pT) in connection with time-invariant parameters of the hydraulic cylinder unit (1).

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Fürth, Germany

Ilhom Gafur