A crack detection device performs online identification of the occurrence and propagation of a crack in the surface of the barrel portion of a rolling roll. A rolling roll is provided with the crack detection function without any substantial modification of the rolling device and without any continuous disposition of multiple sensors in the rolling roll. The detection device is incorporated in a rolling device having a barrel portion and shaft portions extending as a unit from both ends of the barrel portion and includes the rolling roll where an AE sensor detecting elastic waves generated on a surface of the barrel portion and a calculation unit calculating a feature value of the elastic waves detected by the AE sensor are disposed in at least one of the shaft portions and a discrimination unit discriminating, from the feature value, elastic waves attributable to a crack occurring in the barrel surface.

Methods and systems for electrically heating and cooling rollers is described. A system may include one or more rollers comprising one or more electrical heating elements and one or more air channels. The one or more electrical heating elements may integrated to a power source and control circuit through an electrical contact on at least one end of the roller. The control circuit may additionally receive input from one or more temperature sensors.

Method for monitoring wear to cylinders of the cages of a rolling mill, in particular for bars or rods, including the following steps: reading by a neural network of a plurality of data relating to the initial conditions of one or more rolling cylinders, in particular one or more pairs of cylinders each belonging to a rolling cage, to the settings, and to the running of the process; and generation by the neural network of signals relating to the state of wear of the cylinders.

Method for monitoring wear to cylinders of the cages of a rolling mill, in particular for bars or rods, including the following steps: reading by a neural network of a plurality of data relating to the initial conditions of one or more rolling cylinders, in particular one or more pairs of cylinders each belonging to a rolling cage, to the settings, and to the running of the process; and generation by the neural network of signals relating to the state of wear of the cylinders.

Before the rolling of a metal strip on a finishing train, the actual width and actual temperature of portions of the metal strip are respectively detected. The portions of the metal strip are tracked while they run through the finishing train. The rolling stands are respectively assigned width controlling devices which determine the setpoint width and the actual width after the rolling in the assigned rolling stand, and a downstream additional setpoint value, by which the desired tension downstream of the assigned rolling stand is corrected in order to bring the actual width closer to the setpoint width. The downstream additional setpoint value is both taken into account in the determination of the actual width and fed to a tension controller, which sets an actual tension, in the metal strip downstream of the assigned rolling stand, in accordance with the corrected setpoint tension. Determining the downstream additional setpoint value by the difference between the setpoint width and the actual width of a portion of the metal strip.

There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.

Hot rolling stock (1) made of metal which is rolled in at least one roll stand (2) and then cooled in a cooling section (5) arranged downstream of the at least one roll stand (2). Sound generated by means of a sound generator arrangement (8) is coupled into the rolling stock (1) by a coupling device (1) so that a standing sound wave is formed at least in the region of the rolling stock (1) which is located in the vicinity of the coupling device (10).

A rolling load prediction method predicts a rolling load of a rolling mill for rolling steel and includes predicting the rolling load of the rolling mill in a case where the steel is rolled under an operating condition for prediction, by inputting the operating condition for prediction into a rolling load prediction model that has been trained with operation record data including at least a factor related to a temperature of the steel as an input variable and an actual value of the rolling load of the rolling mill as an output variable.

A rolling load prediction method predicts a rolling load of a rolling mill for rolling steel and includes predicting the rolling load of the rolling mill in a case where the steel is rolled under an operating condition for prediction, by inputting the operating condition for prediction into a rolling load prediction model that has been trained with operation record data including at least a factor related to a temperature of the steel as an input variable and an actual value of the rolling load of the rolling mill as an output variable.

The present invention discloses a control method of hot mill coiler side guides based on spark recognition, where the side guides are adjusted according to the width of sparks from the friction between the hot rolled strip (20) and the side guides (11). An industrial camera (9) is provided obliquely above the side guides (11), and a detection system implements a real-time analysis on the images taken by the industrial camera and determines the magnitude of sparks generated on either side of the side guides according to the spark width. For each unilateral side guide, it is adjusted according to the spark width M.sub.S corresponding to that side guide (11). For said unilateral side guide (11), the deviation of the single-side spark width ΔM.sub.S is obtained according to ΔM.sub.S=M.sub.S−M.sub.aim. The position adjustment magnitude ΔW.sub.S of the unilateral side guide (11) can be obtained according to formula (I). And the pressure adjustment magnitude ΔP.sub.S of the unilateral side guide (11) can be obtained according to formula (II). This method allows the hot rolled strip (20) always in the relative center of the steel coil, reduces the wear of the side guides (11), avoids various defects of the steel coil, and makes the steel coil in good shape.