Rolling of rolling material with tension change at the rolling of the tail end of the rolling material

A non-transitory computer readable medium storing program code executable by a controller to control rolling of a rolling material in a rolling mill having roll stands, by performing a method comprising:

• rolling front sections of the rolling material first in a front group of the roll stands and then in a rear group of the roll stands, the front group of the roll stands including a first set of the roll stands driven by a first drive common to the front group of the roll stands and the rear group of the roll stands including a second set of the roll stands driven by a second drive common to the rear group of the roll stands;
• rolling rear sections of the rolling material in the front group of the roll stands during said rolling of the front sections of the rolling material in the rear group of the roll stands;
• detecting a run-out speed of the rolling material exiting the front group of the roll stands;
• detecting a run-in speed of the rolling material entering the rear group of the roll stands;
• and
• controlling a rear group speed with which the rear group of the roll stands is driven based on a feed-forward signal, such that a relation of the run-in speed to the run-out speed equals a predetermined value that is kept constant until a location time point at which a tail end of the rolling material reaches a predetermined location upstream of the front group of the roll stands, and is increased according to a predetermined function after the location time point.

A control device to control rolling of a rolling material in a rolling mill having roll stands, comprising:

• a processor configured for executing program code stored on a non-transitory computer readable medium to perform a method of:
• rolling front sections of the rolling material first in a front group of the roll stands and then in a rear group of the roll stands, the front group of the roll stands including a first set of the roll stands driven by a first drive common to the front group of the roll stands and the rear group of the roll stands including a second set of the roll stands driven by a second drive common to the rear group of the roll stands,
• rolling rear sections of the rolling material in the front group of the roll stands during the rolling of the front sections of the rolling material in the rear group of the roll stands,
• detecting a run-out speed of the rolling material exiting the front group of the roll stands,
• detecting a run-in speed of the rolling material entering the rear group of the roll stands, and
• controlling a rear group speed with which the rear group of the roll stands is driven based on a feed-forward signal, such that a relation of the run-in speed to the run-out speed equals a predetermined value that is kept constant until a location time point at which a tail end of the rolling material reaches a predetermined location upstream of the front group of the roll stands, and is increased according to a predetermined function after the location time point.

A rolling mill for rolling a rolling material, comprising:

• roll stands, including a front group of the roll stands having a first set of the roll stands in the front group driven by a first drive common to the front group of the roll stands, and a rear group of the roll stands having a second set of the roll stands in the rear group driven by a second drive common to the rear group of the roll stands;
• and
• a control device, including at least one hardware processor, configured to control rolling of rolling material according to a method comprising:
• rolling front sections of the rolling material first in the front group of the roll stands and then in the rear group of the roll stands,
• rolling rear sections of the rolling material in the front group of the roll stands during the rolling of the front sections of the rolling material in the rear group of the roll stands,
• detecting a run-out speed of the rolling material exiting the front group of the roll stands,
• detecting a run-in speed of the rolling material entering the rear group of the roll stands, and
• controlling a rear group speed with which the rear group of the roll stands is driven based on a feed-forward signal, such that a relation of the run-in speed to the run-out speed equals a predetermined value that is kept constant until a location time point at which a tail end of the rolling material reaches a predetermined location upstream of the front group of the roll stands, and is increased according to a predetermined function after the location time point.