Primetals Technologies Germany Gmbh

Siemens Aktiengesellschaft

Primetals Technologies Austria Gmbh

Siemens Vai Metals Technologies Gmbh

Ansgar Grüss

Bernd Linzer

Alois Seilinger

Rainer Burger

Robert Linsbod

Gerald Eckerstorfer

Johannes Dagner

Andreas Maierhofer

Daniel Kotzian

Otto Schmid

Helmut Hlobil

Peter Hunt

Andreas Jungbauer

Johanned Dagner

In a normal operation of a roll stand (e.g.) of a roll train, working rolls () of the roll stand () are adjusted to a roll gap (s) by adjusting a control element position (p) of a control element () of the roll stand (), such that the working rolls () roll the metal band (). To determine the control element position (p) to be adjusted, a calibration value (sC) of the respective roll stand (), further status parameters (P) of the roll stand () and a target roll gap (s*) are specified to a model () of the roll stand (). The model () determines the control element position (p) to be adjusted therefrom. In the calibration operation, a control element position (p) is initially adjusted such that the metal band () passes through the roll stand () without being rolled. The control element position (p) is varied such that the working rolls () roll the metal band (). A thickness (d) of the metal band () is detected by a downstream thickness-measuring device (). The thickness (d), further status parameters (P) and the control element position (p) are supplied to the model (), which determines the calibration value (sC) of the respective roll stand () therefrom. Subsequently, normal operation is resumed and the previously determined calibration value (sC) is used to determine control element positions (p) to be adjusted as the calibration value (sC) of the respective roll stand ().

In-line calibration of the roll gap of a roll stand

A metal band is first rolled in a front and then in a rear (downstream) roll stand of a multi-stand rolling train. A looper between the roll stands may detect a band tension in the metal band. The band tension is supplied to a first and a second tension controller to determine an application additional target value and a speed additional target value. The second tension controller may only determine a value less than or greater than 0, as the speed additional target value, if the band tension is above or below an upper or lower band tension limit. Otherwise, the speed additional target value may be 0. The first tension controller is also supplied with a target tension that falls between the band tension limits. The application additional target value may be used to act on the rear roll stand.

Robust band tension control

A method and apparatus for flatness measuring and measuring of residual stresses in a metallic flat product (): The method includes bending the flat product () in a bending device () such that a planar flat product () forms an arc () with a target bending radius rafter bending; measuring the contour and the actual bending radii r(y), in the region of the arc () of the bent flat product () at a plurality of positions along the width direction of the flat product (); and determining the flatness of the flat product () taking into account the measured contour of the bent flat product ().

Flatness measuring and measuring of residual stresses for a metallic flat product

A method for altering the width of a strip-shaped rolled material (), before, during or after hot rolling the rolled material in a hot rolling mill. The problem is to specify a method for altering width so that the length of a rolled out transition piece lying outside width tolerances can be reduced. Scrap losses are to be reduced. The crown of at least one working roll and/or at least one backing roll of a stand () is set as a function of a width error e=B&#x2212;B between a setpoint width Band the width B of the rolled material (), wherein the crown is increased when e&#x3e;0 and the crown is reduced when e&#x3c;0. AA RBB B.

Width-altering system for strip-shaped rolling rock

A current temperature is ascertained for sections of a strip ahead of a first mill stand. The temperatures of the strip sections are predicted with a prediction horizon corresponding to multiple strip sections, including when each strip section is milled in the first mill stand for which time a nip profile formed by the working rolls is predicted. A control parameter for milling a specific strip section in the first mill stand is ascertained for controlling a control device of the first mill stand. A manipulated variable curve for the control device, influencing the nip profile of a nip formed by working rolls of the first mill stand, is set for the prediction horizon and optimized for the predicted nip profile and a desired profile. The current value of the optimized manipulated variable curve corresponds to the control parameter which is fed to the control device as the manipulated variable.

Control method for mill train

A method for reducing the strip tension of a rolling stock, may include: transporting the rolling stock using a roller table between two successive rolling units, wherein a rolling stock loop is formed in a depression in a section of the roller table between the two rolling units, the rolling stock loop being supported by the roller table at least in one off-center portion of the section, wherein the supporting line of the roller table in this portion corresponds to the catenary curve of the free span; measuring a loop depth of the rolling stock loop; calculating a desired value of the loop depth that corresponds substantially to the free span, e.g., depending on the material, thickness and temperature of the rolling stock; controlling the main drives and/or the gap adjustment of the rolling units based on the desired value and the measured loop depth, such that the loop depth substantially corresponds to the desired value.

Reduction of the strip tension of rolling stock between two rolling units to a minimum

Based on an actual temperature upstream of a roll stand, a predicted temperature is estimated for when strip sections of the strip will roll through the roll stand. The predicted temperature is used to predict material moduli, which is used to control a regulating device that influences a roll gap for the roll stand and to parameterize a roll gap control system. A roll gap profile is predicted based on the predicted temperatures, and is compared with a nominal roll gap profile. A regulating variable that influences a profile of a roll gap is set. The regulating variable is then corrected based on the comparison with the nominal roll gap profile. The predictions are made using a prediction horizon corresponding to a plurality of consecutive sections of the strip. Control is performed for both an operator side and a drive side of the strip.

Control method for a rolling train

In a rolling mill, an open-loop and/or closed-loop control device and a method for adjusting a discharge thickness of rolling stock which passes through a multi-stand mill train, wherein a first section of the rolling stock is rolled to a first discharge thickness, a second section of the rolling stock is rolled to a second discharge thickness which is different from the first discharge thickness. Because a transition from the first discharge thickness to the second discharge thickness takes place at a feed rate of the rolling stock into the mill train which is adjusted as a function of a discharge rate of the rolling stock of a unit which is arranged upstream of the mill train in the direction of mass flow, a method can be made available which runs essentially without reactions for units which are arranged upstream of the mill train in the direction of mass flow.

Method for adjusting a discharge thickness of rolling stock that passes through a multi-stand mill train, control and/or regulation device and rolling mill

Drive loads for a plurality of drives of a mill train for rolling rolling stock with a plurality of rolling stands each being assigned at least one drive, are adjusted essentially to a first set point value on the basis of operation of the mill train in accordance with a first pass sequence. Redistribution of drive loads is improved, by adjusting the drive loads during the rolling to a second set point value different from the first set point value based on operating the mill train in accordance with a second pass sequence different from the first pass sequence, wherein at least during the adjustment of the second set point values a feed rate of the rolling stock into the mill train is adjusted as a function of a discharge rate of the rolling stock which is arranged upstream of the mill train in the direction of mass flow.

Method for adjusting a drive load for a plurality of drives of a mill train for rolling rolling stock, control and/or regulation device, storage medium, program code and rolling mill

A device and method are disclosed for positioning at least one of two casting rolls in a continuous casting process for producing a metal strip. The device and the method allow adjusting or modifying the casting gap between the casting rolls during the ongoing operation, thereby having an influence on the strip thickness and the strip profile of the produced metal strip.

Growing community of inventors

Erlangen, Germany

Ansgar Grüss