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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,

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.

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1. An operating method for a determining device attached to a rolling mill, wherein during operation of the rolling mill, a rolling stock running through the rolling mill is machined by means of a machining device, and the machining device is controlled by means of a controller, the method comprisin

1. An operating method for a determining device attached to a rolling mill, wherein during operation of the rolling mill, a rolling stock running through the rolling mill is machined by means of a machining device, and the machining device is controlled by means of a controller, the method comprising: generating a time profile of a pre-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location upstream of the machining device, as the rolling stock runs through the rolling mill,generating a time profile of a post-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location downstream of the machining device, as the rolling stock runs through the rolling mill,calculating a time-based variance of the pre-machining variable time profile representing the variability of the pre-machining variable over time,calculating a time-based variance of the post-machining variable time profile representing the variability of the post-machining variable over time,calculating a controller characteristic based on (a) the time-based variance of the pre-machining variable time profile and (b) the time-based variance of the post-machining variable time profile, the controller characteristic being configured for reducing a subsequently calculated time-based variance of the post-machining variable time profile,using at least the setpoint variable and the calculated controller characteristic to determine a manipulated variable for the machining device,outputting the manipulated variable to the machining device, andadjusting the machining of the rolling stock by the machining device in accordance with the manipulated variable output to said machining device. 2. The operating method according to claim 1, wherein: the rolling stock is strip-shaped;the pre-machining variable of the rolling stock is a pre-machining strip thickness of the rolling stock;the post-machining variable of the rolling stock is a post-machining strip thickness of the rolling stock; andthe manipulated variable is a tension applied to the rolling stock. 3. The operating method according to claim 1, wherein the post-machining variable of the rolling stock is selected from the group consisting of a dimension of the rolling stock transverse to a running direction of the rolling stock, a tension, a microstructural property, in the case of a strip-shaped rolling stock, a strip flatness, and a ratio between two mutually orthogonal dimensions of the rolling stock transverse to the running direction of the rolling stock. 4. An operating program product comprising a non-transitory machine readable medium that comprises machine code, which when executed by a determining device attached to a rolling mills: generates a time profile of a pre-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location upstream of the machining device, as the rolling stock runs through the rolling mill,generates a time profile of a post-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location downstream of the machining device, as the rolling stock runs through the rolling mill,calculates a time-based variance of the pre-machining variable time profile representing the variability of the pre-machining variable over time,calculates a time-based variance of the post-machining variable time profile representing the variability of the post-machining variable over time,calculates a controller characteristic based on (a) the time-based variance of the pre-machining variable time profile and (b) the time-based variance of the post-machining variable time profile, the controller characteristic being configured for reducing a subsequently calculated time-based variance of the post-machining variable time profile,uses at least the setpoint variable and the calculated controller characteristic to determine a manipulated variable for the machining device,outputs the manipulated variable to the machining device, andadjusts the machining of the rolling stock by the machining device in accordance with the manipulated variable output to said machining device. 5. A determining device attached to a rolling mill, wherein during operation of the rolling mill, a rolling stock running through the rolling mill is machined by means of a machining device controlled by means of a controller, wherein the determining device is programmed to: generate a time profile of a pre-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location upstream of the machining device, as the rolling stock runs through the rolling mill,generate a time profile of a post-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location downstream of the machining device, as the rolling stock runs through the rolling mill,calculate a time-based variance of the pre-machining variable time profile representing the variability of the pre-machining variable over time,calculate a time-based variance of the post-machining variable time profile representing the variability of the post-machining variable over time, andcalculate a controller characteristic based on (a) the time-based variance of the pre-machining variable time profile and (b) the time-based variance of the post-machining variable time profile, the controller characteristic being configured for reducing a subsequently calculated time-based variance of the post-machining variable time profile,the controller characteristic being used by the controller for adjusting the operation of the machining device. 6. The determining device according to claim 5, wherein the post-machining variable of the rolling stock is selected from the group consisting of a dimension of the rolling stock transverse to a running direction of the rolling stock, a tension, a microstructural property, in the case of a strip-shaped rolling stock, a strip flatness, and a ratio between two mutually orthogonal dimensions of the rolling stock transverse to the running direction of the rolling stock. 7. The determining device according to claim 5, wherein: the rolling stock is strip-shaped;the pre-machining variable of the rolling stock is a pre-machining strip thickness of the rolling stock;the post-machining variable of the rolling stock is a post-machining strip thickness of the rolling stock; andthe manipulated variable is a tension applied to the rolling stock. 8. A rolling mill, comprising: a machining device by means of which a rolling stock running through the rolling mill is machined,a determining device programmed to: generate a time profile of a pre-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location upstream of the machining device, as the rolling stock runs through the rolling mill,generate a time profile of a post-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location downstream of the machining device, as the rolling stock runs through the rolling mill,calculate a time-based variance of the pre-machining variable time profile representing the variability of the pre-machining variable over time,calculate a time-based variance of the post-machining variable time profile representing the variability of the post-machining variable over time, andcalculate a controller characteristic based on (a) the time-based variance of the pre-machining variable time profile and (b) the time-based variance of the post-machining variable time profile, the controller characteristic being configured for reducing a subsequently calculated time-based variance of the post-machining variable time profile, anda controller programmed to: determine a manipulated variable for the machining device based on at least a setpoint variable and the calculated controller characteristic,output the manipulated variable to the machining device, such that the machining device machines the rolling stock in accordance with the manipulated variable output to it. 9. A rolling mill according to claim 8, wherein the rolling mill is designed as a cold rolling mill or as a hot rolling mill for rolling metal. 10. The rolling mill according to claim 8, wherein the rolling mill is designed as a rolling mill for rolling a strip-shaped rolling stock or a bar-shaped rolling stock. 11. The rolling mill according to claim 8, wherein the manipulated variable is selected from the group consisting of a desired tension, a desired adjustment or a desired roll gap of a rolling stand, a desired rolling force or a desired thermal influence of the rolling stock. 12. The rolling mine according to claim 8, wherein the post-machining variable of the rolling stock is selected from the group consisting of a dimension of the rolling stock transverse to a running direction of the rolling stock, a tension, a microstructural property, in the case of a strip-shaped rolling stock, a strip flatness, and a ratio between two mutually orthogonal dimensions of the rolling stock transverse to the running direction of the rolling stock.