Continuous rolling train with integration and/or removal of roll stands during ongoing operation

An operating method for a continuous rolling train which has a number of roll stands, with a rolling stock passing through the continuous rolling train being rolled in a plurality of the roll stands in succession, such that the rolling stock has predetermined final properties when it leaves the rolling train wherein to integrate a roll stand which is not rolling the rolling stock into the continuous rolling train during the rolling of the rolling stock, the method comprises:

• controlling by a control device of the continuous rolling train the roll stand to be integrated such that a rotational speed of working rolls of the roll stand to be integrated corresponds to a setpoint exit speed of the rolling stock at the location of the roll stand to be integrated, and then controls the roll stand to be integrated such that the working rolls are screwed down on the rolling stock but the rolling stock is not yet rolled in the roll stand to be integrated,
• after the screw-down of the working rolls of the roll stand to be integrated on the rolling stock, controlling by the control device the roll stand to be integrated such that the roll stand to be integrated has load applied to it according to a defined temporal load application profile, such that the roll stand to be integrated rolls a certain section of the rolling stock during the load application profile,
• controlling by the control device at least one other of the roll stands of the continuous rolling train such that the at least one other roll stand is relieved of load according to a defined temporal load relief profile, wherein the load application profile of the roll stand to be integrated and the load relief profile of the at least one other roll stand are coordinated with one another such that, during the load relief profile, the at least one other roll stand rolls one and the same section of the rolling stock as the roll stand to be integrated during the load application profile, and such that the final properties of the rolling stock are maintained,
• after the application of load, controlling by the control device the rotational speed of the working rolls of the roll stand to be integrated such that an exit speed, effected by the rolling of the rolling stock in the roll stand to be integrated, of the rolling stock at the location of the roll stand to be integrated corresponds at all times to the setpoint exit speed.

A control device of a continuous rolling train comprising a plurality of roll stands, which control device is operable:

• to control a roll stand to be removed such that the roll stand to be removed is completely relieved of load according to a defined temporal load relief profile, and such that the roll stand to be removed rolls a certain section of a rolling stock during the load relief profile,
• to control at least one other of the roll stands of the continuous rolling train such that the at least one other roll stand has load applied to it according to a defined temporal load application profile, wherein the load relief profile of the roll stand to be removed and the load application profile of the at least one other roll stand are coordinated with one another such that, during the load application profile, the at least one other roll stand rolls one and the same section of the rolling stock as the roll stand to be removed during the load relief profile, and such that the final properties of the rolling stock are maintained,
• to control a rotational speed of working rolls of the roll stand to be removed until the roll stand to be removed is completely relieved of load, in such a way that an exit speed of the rolling stock effected by the rolling of the rolling stock in the roll stand to be removed corresponds at all times to a predetermined setpoint exit speed, and
• to control the roll stand to be removed, after the roll stand to be removed has been completely relieved of load, and so as to maintain a correspondence of the rotational speed of the working rolls with the setpoint exit speed, such that the working rolls of the roll stand to be removed are lifted off the rolling stock, and said control device then brings the roll stand to be removed to a stop.

A control device of a continuous rolling train comprising a plurality of roll stands, which control device is operable:

• to control a roll stand to be integrated such that a rotational speed of working rolls of the roll stand to be integrated corresponds to a setpoint exit speed of the rolling stock at the location of the roll stand to be integrated, and then controls the roll stand to be integrated such that the working rolls are screwed down on the rolling stock but the rolling stock is not yet rolled in the roll stand to be integrated,
• after the screw-down of the working rolls of the roll stand to be integrated on the rolling stock, to control the roll stand to be integrated such that the roll stand to be integrated has load applied to it according to a defined temporal load application profile, such that the roll stand to be integrated rolls a certain section of the rolling stock during the load application profile,
• to control at least one other of the roll stands of the continuous rolling train such that the at least one other roll stand is relieved of load according to a defined temporal load relief profile, wherein the load application profile of the roll stand to be integrated and the load relief profile of the at least one other roll stand are coordinated with one another such that, during the load relief profile, the at least one other roll stand rolls one and the same section of the rolling stock as the roll stand to be integrated during the load application profile, and such that the final properties of the rolling stock are maintained,
• after the application of load, to control the rotational speed of the working rolls of the roll stand to be integrated such that an exit speed, effected by the rolling of the rolling stock in the roll stand to be integrated, of the rolling stock at the location of the roll stand to be integrated corresponds at all times to the setpoint exit speed.