In a method for the online determination of at least one rolling parameter when rolling a rolling material rolled along a rolling line in a rolling mill including at least two rolls on a roll stand, the rolling material is guided past or through at least one measuring device during the rolling, which interacts with a rolling material variable of the rolling material, the rolling material variable being changeable along the length of the rolling material, and outputs a measurement signal, wherein: (i) the measurement signal is transferred into the frequency space, and the rolling parameter is determined from the measurement signal transferred into the frequency space, and/or (ii) a frequency inherent in the change of the rolling material variable is determined from the measurement signal, and the rolling parameter is determined on the basis of the determined frequency.

In thickness control processing, transfer processing of an entry thickness He(N) is performed (step S1). In the transfer processing, data of the entry thickness He(N) is transferred from a position P11 to a position P12 at the same speed as the speed of a material to be rolled M. Subsequently, an amount of change in a thickness ΔH(N) is calculated (step S2). The amount of the change in the thickness ΔH(N) is calculated based on data of a delivery thickness Hd(N) and data of a transferred thickness Hc(N) transferred to the position P12 at a timing when the data of the delivery thickness Hd(N) is measured. Then, a target entry thickness He(N)_tgt is calculated (step S3). Subsequently, a manipulated amount of rolling speed VR(N−2) and VR(N−k) are calculated (step S4).

A metal strip is fed to a rolling stand by a feeding device and removed by a removing device. A control device cyclically determines, based on final thickness deviations of portions of the metal strip from a setpoint thickness of the metal strip on the exit side, setpoint values and outputs the determined setpoint values to final control elements. The final control elements include the feeding device, an adjusting device for the rolling gap of the rolling stand, a drive for driving rolls of the rolling stand, and/or the removing device. For the feeding device, the drive, and the removing device, the setpoint value is a setpoint speed or torque. For the adjusting device, the setpoint value is a setpoint rolling-gap value. The control device determines a setpoint value based on a number of final thickness deviations allowing for the inverse frequency response of the respective final control element.

A method for determining a present thickness of a work item while being processed in a rolling mill, the method including: acquiring a data signal reflecting a time dependence of an eddy current decay in the work item caused by an applied pulsed magnetic field, determining a thickness parameter value based on the acquired signal, the thickness parameter value being determined from samples in the data signal, the thickness parameter value being dependent on a ratio between a thickness of the work item and a resistivity of the work item, computing a ratio between a reference thickness value of the work item and the thickness parameter value to thereby provide an instantaneous resistivity value, determining a mean resistivity value based on the instantaneous resistivity value, and providing an output signal based on the mean resistivity of the work item and the thickness parameter value, the output signal being indicative of the determined present thickness of the work item.

A roll stand (1) having at least one pair of rollers (4, 5) between which a flat rolled product (2) is located. The rollers (4, 5) can be moved axially in opposite directions. The roll stand (1) has a bending system (6) for the rollers (4, 5). A controller (8) of the roll stand (1) uses the bending and the axial movement of the rollers (4, 5) in order to regulate the roll gap contour as an adjustment mechanism. Prior to rolling a respective rolled product (2), the controller determines a respective axial position (x) as the resulting axial position (x) and sets the axial position as the axial position (x) of the rollers (4, 5) for the roll stand (1) in order to roll the next flat rolled product (2). For this purpose, the controller (8) ascertains how far a specified target roll gap contour can be approximated for a plurality of axial positions (x) of the rollers (4, 5) by actuating the adjustment mechanism (6, 7) while taking into consideration technological boundary conditions and classifies the axial positions (x) at which a deviation of the resulting roll gap contour from the target roll gap contour lies below a specified limit as being permissible. The controller then removes the axial positions (x) excluded from the plurality of axial positions (x) classified as being permissible as long as at least one axial position (x) classified as being permissible still remains after the excluded axial positions (x) are removed. The controller (8) determines one of the remaining axial positions (x) as the resulting axial position (x).

In a decision control device of a control system, a predetermined pass schedule is decided by adjusting the rolling force per unit width at a last stand of a hot finishing tandem rolling mill to cause the edge profile on the outlet side of the last stand to fall within an allowable range based on the relationship between a strip crown and the edge profile on the outlet side of the last stand with respect to the rolling force per unit width and a strip shape control parameter, obtained regarding the last stand, and adjusting the strip shape control parameter of the last stand to cause the strip shape on the outlet side of the last stand to fall within an allowable range and cause the strip crown to become a predetermined value or smaller.

A method for producing a thickness-profiled metal strip in which at least one opening is produced in the metal strip and in a subsequent step, the metal strip is longitudinally rolled with at least one roller that penetrates into the metal strip in some regions across its strip width and thus a thickness profiling at least in the width direction of the metal strip is produced. In order to improve the reproducibility of the method, what is proposed is that at least one hole passing through the metal strip is produced as an opening in the metal strip, over which hole the roller that penetrates into the metal strip longitudinally rolls in order to produce the thickness profiling in the width direction of the metal strip.

A process includes flexible rolling of a strip made of a metallic material, wherein a thickness profile with different sheet thicknesses along the length of the strip is produced such that successive regions of the flexibly rolled strip each correspond to a target thickness profile of a sheet metal blank to be cut out of same; determining a measured thickness profile of a plurality of successive regions of the strip; calculating a target position in the strip for a sheet metal blank to be cut out of the strip depending on the generated measured thickness profile of at least two successive regions of the strip; cutting the flexibly rolled strip by at least one cutting device along the target position for producing the sheet meal blank. A plant is further provided for producing a sheet metal blank.

In a method for the online determination of at least one rolling parameter when rolling a rolling material rolled along a rolling line in a rolling mill including at least two rolls on a roll stand, the rolling material is guided past or through at least one measuring device during the rolling, which interacts with a rolling material variable of the rolling material, the rolling material variable being changeable along the length of the rolling material, and outputs a measurement signal, wherein: (i) the measurement signal is transferred into the frequency space, and the rolling parameter is determined from the measurement signal transferred into the frequency space, and/or (ii) a frequency inherent in the change of the rolling material variable is determined from the measurement signal, and the rolling parameter is determined on the basis of the determined frequency.

A rolling device includes a roller, a heat exchange assembly, and an adjustment assembly. The roller is provided with a rolling surface configured to roll a target member. The heat exchange assembly is arranged opposite to the rolling surface. The heat exchange assembly is configured to adjust the temperature of the rolling surface. The adjustment assembly is connected to the heat exchange assembly and is configured to adjust the position of the heat exchange assembly in an axial direction of the roller, so as to adjust temperatures of different regions of the rolling surface of the roller in the axial direction. A rolling system includes the rolling device, a measurement device and a controller, the measurement device is configured to measure the thickness of the target member after rolling; and the controller is connected in communication with the measurement device and the adjustment assembly.