Abstract: A regulation device (7) for a rolling stand (2) has a force regulator (8) and a position regulator (9) mounted underneath the force regulator. During operation of the regulation device, a rolling force target value (F*) and a rolling force actual value (F) are supplied to the force regulator (8). A regulating distance correcting value (ds1*) is determined by the force regulator (8) from the rolling force target value (F*) and the rolling force actual value (F). The regulating distance correcting value (ds1*), an excentricity compensation value (ds2*), and a regulating distance actual value (s) of a regulating element (6) are supplied to the position regulator (9). A correcting quantity (dq) is determined by the position regulator (9) from the values (ds1*, ds2*, s) supplied thereto and is delivered to the regulating element (6). The regulating distance of the regulating element (6) is changed according to the correcting quantity (dq).

Abstract: 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.

Abstract: A control device for the position control of a hydraulic cylinder unit has a controller which receives a set and an actual piston position and determines a preliminary manipulated variable based on the difference of the set and actual positions. A linearization unit multiplies the variable with a linearization factor and outputs it to the valve control unit so that the piston is adjusted at an adjustment speed. The linearization unit determines the factor dynamically as a function of the actual piston position and of working pressures that prevail at both piston sides. The linearization factor is determined such that a ratio of the adjustment speed to the difference of the set and actual positions is independent of the actual position and the working pressures. In the specific case where the controller is configured as a P controller, the order of the controller and the linearization unit can be reversed.

Abstract: During operation of a rolling mill, a rolling product running through the mill is machined by a machining device which is controlled by a controller, to which a target and an actual value of the roll product are fed after machining. The controller determines based on the target and the actual value, in conjunction with controller characteristic, a controlled variable for the machining device and outputs the controlled variable to the machining device which machines the roll product according to the output controlled variable. A detection device receives the actual value after machining and a corresponding actual value of the mill product before machining. Based on the temporal profiles of the actual values, the device dynamically determines the controller characteristic such that the variance of the actual value at least tends to be minimized after machining. The device also parameterizes the controller according to the determined control characteristic.

Abstract: A control device for the position control of a hydraulic cylinder unit has a controller which receives a set and an actual piston position and determines a preliminary manipulated variable based on the difference of the set and actual positions. A linearization unit multiplies the variable with a linearization factor and outputs it to the valve control unit so that the piston is adjusted at an adjustment speed. The linearization unit determines the factor dynamically as a function of the actual piston position and of working pressures that prevail at both piston sides. The linearization factor is determined such that a ratio of the adjustment speed to the difference of the set and actual positions is independent of the actual position and the working pressures. In the specific case where the controller is configured as a P controller, the order of the controller and the linearization unit can be reversed.

Abstract: A regulation structure (13) for regulating a hydraulic cylinder unit (1) has an internal regulator (15) and an external regulator (16). The external regulator is supplied with a set force (F*) or a set position (s*) for a piston (3) of the hydraulic cylinder unit and a corresponding actual parameter (F, s) for the piston. The external regulator determines a set status (z*) for the hydraulic cylinder unit and provides the same to the internal regulator as the set value therefor. The regulator structure comprises a status determining unit (19), provided with both an actual position (s) and an actual force (F) for the piston and which determines an actual status (z) for the hydraulic cylinder unit and provides the same to the internal regulator as the actual value therefor. The internal regulator determines a control parameter (u) for a valve control unit (9) of the hydraulic cylinder unit (1).

Abstract: During operation of a rolling mill, a rolling product running through the mill is machined by a machining device which is controlled by a controller, to which a target and an actual value of the roll product are fed after machining. The controller determines based on the target and the actual value, in conjunction with controller characteristic, a controlled variable for the machining device and outputs the controlled variable to the machining device which machines the roll product according to the output controlled variable. A detection device receives the actual value after machining and a corresponding actual value of the mill product before machining. Based on the temporal profiles of the actual values, the device dynamically determines the controller characteristic such that the variance of the actual value at least tends to be minimized after machining. The device also parameterizes the controller according to the determined control characteristic.

Abstract: A regulation device (7) for a rolling stand (2) has a force regulator (8) and a position regulator (9) mounted underneath the force regulator. During operation of the regulation device, a rolling force target value (F*) and a rolling force actual value (F) are supplied to the force regulator (8). A regulating distance correcting value (ds1*) is determined by the force regulator (8) from the rolling force target value (F*) and the rolling force actual value (F). The regulating distance correcting value (ds1*), an excentricity compensation value (ds2*), and a regulating distance actual value (s) of a regulating element (6) are supplied to the position regulator (9). A correcting quantity (dq) is determined by the position regulator (9) from the values (ds1*, ds2*, s) supplied thereto and is delivered to the regulating element (6). The regulating distance of the regulating element (6) is changed according to the correcting quantity (dq).

Abstract: 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 a at lest 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.

Abstract: A method and a device for rolling a metal strip (1) in a rolling train, the rolling train having at least two rolling stands, the metal strip (1) having at least two partial areas (3, 4) of different thicknesses, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece (2), and the rolling velocity of a rolling stand, during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2), being set as a function of the forward slip of the rolling stand and of the temperature of the metal strip.

Abstract: A method and a device for cutting a rolled strip which runs out from a hot-rolling mill train, especially at particularly high speed, is described. The rolled strip is cut by shears arranged downstream of the hot-rolling mill train, a driver having two driver rollers being arranged downstream of the shears, the rolled strip running through between the driver rollers, and the rolls of the driver being driven open subsequent to the cutting.

Abstract: A process and system for casting a billet of liquid metal. The liquid metal is cast into a casting die and drawn from the casting die as a billet having a solidified investment and a liquid core. The liquid metal level in the casting die is regulated to a predetermined reference value. Disturbance variables, which act on the liquid metal level in the casting die and which cause a deviation between the actual value and the reference value of the liquid metal level, are estimated, and the influence of the disturbance variables on the actual value of the liquid metal level is compensated or reduced using the estimated disturbance variables.

Abstract: A method and a device are provided for rolling a slab, in particular a slab whose thickness varies over its length, using at least two roll stands with a substantially constant and preferably low tension being maintained in the slab between the first and the second roll stand and with substantially constant exit thickness. Until the desired tension is reached in the slab, the rotational speed in the second roll stand is kept constant and the torque in the first roll stand is controlled so as to build up the desired tension in the slab between the first and the second roll stand. After the desired tension is reached, the rotational speed of the first roll stand and the torque of the second roll stand are kept constant.

Abstract: A device is provided for regulating the thickness of rolling stock in a roller stand. The device includes a control device that controls the roller adjustment of the roller stand as a function of the deviation between a reference thickness value (h*) and an estimated value (h') for the thickness of the rolling stock exiting from the roller stand; a model simulating the rolling process in the roller stand, the model calculating the estimated value (h') on the basis of roller technology parameters and measured values; a thickness measurement device that measures the thickness of the rolling stock after its exit from the roller stand with a measurement delay (T.sub.L) providing a measured thickness value (h.sub.L); a delay device for delaying the estimated value (h') determined by the model by at least approximately the amount of the measurement delay (T.sub.L); a correction device generating a correction value (k) as a function of a deviation (.DELTA.h.sub.L) between the measured thickness value (h.sub.

Abstract: In a previous process, the influence of roll eccentricities on the output thickness of the rolled material in a roll stand is suppressed by simulating the output signal of an oscillator and supplying this value to a position or thickness control for the roll stand, where the frequency of the output signal is set according to the roll rotation speed. In the process according to the invention, the amplitude and phase of the output signal are set so that the exit thickness of the rolled material is measured with a measuring delay in relation to the thickness reduction in the roll gap. A difference signal is generated from the delayed roll screw-down signal and a measured thickness signal multiplied by the sum of one and the quotient of the rigidity of the rolled material and the roll stand. The output signal of the oscillator is corrected according to the difference between the output signal and the difference signal. The output signal is phase shifted by the amount of measurement delay for a forward slip.

Abstract: A signal which is dependent solely on the disturbance variable is selected by means of a filter and fed to a disturbance detector. This disturbance detector simulates the steady and alternating component (sine component) of the selected signal, as well as a signal (cosine component) phase-leading by 90.degree. with the latter signal. The correction signal required to exactly compensate for the disturbance variable is determined from the sine and cosine component of the periodic disturbance signal component by means of frequency-controlled function generators and a complex phasor calculation.

Abstract: A process and device for compensation of the effect of roll eccentricities upon thickness regulation of material being rolled in a roll stand (1), wherein eccentricity oscillations are simulated by a model (6) based on measured values of roll adjustment position (s), roll force (F.sub.W) and mean support roll speed (n), together with spring constants (C.sub.G, C.sub.M) for the roll stand and the material. An output signal (.DELTA..sub.R) of the model (6) is used to modify the thickness value (h.sub.a +.DELTA.R) used for regulation, so as to compensate for the effect of roll eccentricity. The model may be implemented by a device (RECO) comprising pairs of oscillators (7), the phase and amplitude relationships of which are adjusted according to the observer principle.