The present invention relates to a method and a device for optimization of flatness control in the rolling of a strip using any number of mill stands and actuators The invention is achieved by using a mill model represented by a mill matrix that contains information of the flatness effect of each actuator, translating each actuator's flatness effect into a coordinate system, whose dimension is less or equal than the number of actuators used, monitoring/sampling the actual flatness values across the strip, computing a vector of the flatness error/deviation as the difference between the monitored/sampled strip flatness and a reference flatness vector, converting the flatness error into a smaller parameterized flatness error vector, using a dynamic controller to calculate optimized actuator set-points in order to minimize the parameterized flatness error, thereby achieving the desired strip flatness The invention also relates to a system for optimization of flatness control in the rolling of a strip

Method and device for optimization of flatness control in the rolling of a strip

A method and a device for tuning and control of industrial processes having varying material flow rate. An adder is configured to add excitation signals to the controller output signal. A measurement system is configured to measure a property in response to the excitation signals. A model based tuning unit is adapted to estimate the value of at least one parameter with unknown value of a process model structure describing the effect of varying material flow rate, based on the measurements of the property and the output signal from the controller, and to calculate a model that describes the dynamics from controller output to controller input based on the estimated value of the parameter, and to perform model based tuning of the controller based on the model that describes the dynamics from controller output to controller input.

Method and device for tuning and control

Methods and apparatus to monitor conditioning machines are disclosed herein. An example system includes a plurality of work rolls to process a strip material. A first sensor detects a first distance between an upper surface of the strip material and a first reference location and a second sensor detects a second distance between an upper surface of the strip material and a second reference location. A controller determines a difference value between the first distance and the second distance to detect material curvature of the strip material.

Methods and apparatus to monitor material conditioning machines

The invention relates to a method for determining at least one controller parameter of a control element in a web tension control circuit for a processing machine for processing a web of material, in particular a shaftless printing press. The at least one controller parameter is determined as a function of at least one parameter characterizing the web of material, at least one parameter characterizing the processing machine, and at least one idle time.

Method for determining at least one control parameter of a control element in a web tension control circuit for a processing machine

The invention relates to a dynamic constant thickness ratio taper control method, wherein the method comprises the following steps: 1) effectiveness judgment of finish rolling outlet band steel taper measured value; obtaining an actual measurement feedback by methods such as filtering, obtaining the needed control deviation W after comparing with a benchmark; 2) calculation of roll gap deviation value on bilateral sides of F1 rolling mill; 3) calculation of roll gap deviation value on bilateral sides of F2 rolling mill; the calculation of F3 rolling mill is in a similar way; adjusting based on the value which is obtained from real-time memorizing and tracking the roll gap actual adjustment on bilateral sides of the F2 rolling mill. The method has the advantages as follows: 1) the method is simple and easy to operate; 2) the method obviously increases the taper control precision since the application of Meishan steel 1780 hot continuous rolling; the comprehensive taper index of plus or minus 20 microns is increased from 50% in the past to the 90% at present; stable application of rolling thin band steel having a thickness of 2.0mm can also be achieved; not only the taper control precision is increased, but also the stability in plate shape and rolling is ensured.

Dynamic constant thickness ratio taper control method

A method regulating flatness of a metal strip at a roll housing output including at least one dynamic flatness actuator. A rolling process characterizes flatness of the strip by measuring a quantity D in n points distributed across the strip width, from n measurements of the quantity D. Then, using an action model of flatness regulation and an optimizing method, an overall setpoint including at least one elementary setpoint is determined for the dynamic actuator, such that a calculated flatness residual defect criterion is minimal, and executing the overall setpoint. The action model on the flatness used for determining the overall setpoint includes, for the dynamic actuator, as many submodels as there are points for measuring the quantity D characteristic of flatness, each submodel enabling the effect of the dynamic actuator on the quantity D to be calculated at the corresponding point when a setpoint is applied thereto.

Regulating flatness of a metal strip at the output of a roll housing

The regulation of the flatness of a metal strip at the outlet of a rolling cage uses a flatness regulation device incorporating at least one dynamic flatness driver which, during rolling, characterises the flatness of the strip by measuring a height (D) at n points distributed over the length of the strip. From the n measurements of this height, using a model of the flatness regulation action and an optimisation method, a global consigned value is determined for the regulation system. The global consigned value comprises at least one elementary value for a dynamic driver, such that a criterion of residual default of the calculated flatness may be minimal and global consigned value is executed by the regulation system. The action model on the flatness utilised to determine the global consigned value is made up for each dynamic driver, providing sub-models for each of the n points of measurement of the height characteristic of the flatness. Each sub-model allows the calculation of the effect on the height at the corresponding point of the dynamic driver when the consigned value is applied. An independent claim is included for a computer program for operating this method of flatness regulation.

Regulation of the flatness of metal strip at the outlet of a rolling cage using a flatness regulation model to activate dynamic regulation drives in response to individual flatness measurements

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Regulating flatness of a metal strip at the output of a roll housing

Regulation of the flatness of metal strip at the outlet of a rolling cage using a flatness regulation model to activate dynamic regulation drives in response to individual flatness measurements