Siemens Aktiengesellschaft

Primetals Technologies Germany Gmbh

Bernhard Weisshaar

Martin Niemann

Dietrich Wohld

Daniel Kotzian

Johann Thomas Wokusch

Josef Hofbauer

Werner Schnalzger

Uwe St&uuml;rmer

Werner Ballheimer

Ansgar Gr&uuml;ss

A method for machining rolled stock () in a rolling train (), the train including at least one rolling block () having at least two rolling stands () with each stand including at least one roll (). Each rolling stand () has a separate drive () with a speed controller () for its roll (). A time (t) that is dependent on the point in time (tB) that an actual loading moment is applied to the drive () of the first rolling stand () of the rolling block (), for controlling the speed of the drive (). An additional value (ZW), dependent on an expected actual loading moment, is fed to the speed controller () of each drive (). Also, a rolling train () for machining rolled stock (), is disclosed having the features above and having an open-loop/closed-loop control unit (), in which software for the method is implemented.

Method for processing material to be rolled on a rolling line, and rolling line

The inflow of liquid metal into a continuous casting mold is set by a closure device. A measured actual meniscus value is fed to a controller determining a closure device target position on the basis of the actual and a corresponding target value. The measured actual value is fed to a disturbance variable compensator. The target position/corrected target position or a corresponding actual value are further fed to the disturbance variable compensator which determines the disturbance variable compensation value. The disturbance variable compensator has a model of the continuous casting mold for determining an expected value. A number of oscillating compensators determine a frequency disturbance proportion. The sum of the frequency disturbance proportions corresponds to the disturbance variable compensation value. The disturbance variable compensator has a jump determiner, by which it determines the jump compensation value by integrating the difference.

Control method for the meniscus of a continuous casting mold

In a multi-stand rolling mill train, a strip successively runs through individual rolling stands. The strip&#x2014;always as seen in relation to a rolling center line&#x2014;is threaded into each of the rolling stands with known respective head offset and inlet-side head pitch, and therefore a strip head emerges with the respective head offset, a respective outlet-side head pitch and a respective outlet-side head curvature. The respective outlet-side head pitch is determined on the basis of respective inlet-side head pitch and pass reduction which takes place in the respective rolling stand. The respective outlet-side head curvature of the strip is determined based on respective measured and further data. The respective outlet-side head curvature is used to determine a respective control intervention for the respective rolling stand and/or the one arranged directly downstream and to drive the corresponding rolling stand in accordance with the respective determined control intervention.

Method for a operating a rolling mill train with curvature recognition

The invention relates to a method for suppressing the influence of roll eccentricities on the run-out thickness of a rolled stock, which runs through a rolling stand, roll eccentricities being identified by using a process model and taken into consideration in the determination of a correction signal for at least one final control element, preferably a final control element for the adjustment position, of the rolling stand, wherein the measured tensile force upstream of the rolling stand is fed to the process model to identify the roll eccentricities. According to the invention, variations in tensile force are fed back in a targeted manner to reduce the effects of periodic roll eccentricities on the rolled stock, whereas all other sources of variation are eliminated. A process model of the rolling nip and the rolls, preferably based on the observer principle, produces reliable data on the roll eccentricity.

Method for suppressing the influence of roll eccentricities

A method and device are provided for casting a strand of liquid metal which is cast into a mold, and which is drawn as a strand out of the mold. The casting level, e.g., a level of the liquid metal in the mold, is regulated to a predetermined casting-level desired value using a casting-level controller having at least one integrator. The output of the integrator of the casting-level controller is replaced by a predetermined value when the difference between the casting-level actual value and the casting-level desired value exceeds a tolerance threshold.

Method and device for casting a strand of liquid metal

Method and device for the reduction and/or compensation of speed drops when threading rolled stock into a roll stand whose rolling speed is controlled with a controller, the controller outputting a predefined supplementary value independently of its input in a predefined transition time interval shortly before, during, or shortly after the rolled sock is threaded into the roll stand.

Method and device for reducing or compensating rotational speed losses during insertion or rolling stock in a roll stand

In chatter monitoring of twin drives of roll stands, vibrations of an upper drive and a lower drive are detected and monitored to determine whether a predetermined amplitude has been exceeded. If the amplitude has been exceeded, a chatter detection signal is generated. In order to prevent the chatter detection signal from being generated erroneously due to an operational pass vibrations, the frequencies of the vibrations of the upper drive and the lower drive are monitored for identity; when the frequencies are identical, the chatter detection signal is suppressed.

Growing community of inventors

Herzogenaurach, Germany

Bernhard Weisshaar