JP3230298U - Rolling stand with device for controlling rolling stability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling stand provided with a device for controlling rolling stability. A rolling stand works with a pair of upper abutment roll CAS and lower abutment roll CAI and a pair of upper intermediate roll CIS and lower intermediate roll CII on each side of a path line of a moving metal product PM. It includes a pair of rolls CTS and CTI. A device for controlling rolling stability by positioning the working rolls so that the moving metal product PM can be rolled is provided, and each of the upper working roll CTS and the lower working roll CTI is horizontal along the longitudinal axis X. Acts on one of the two surfaces of a directionally moving metal product and, by direct contact, passes through at least one of the intermediate rolls that transfers rolling force onto at least one of the working rolls It is provided with four longitudinal moving means MDS1, MDS2, MDI1 and MDI2 for moving the working roll with respect to the vertical axis Z. [Selection diagram] Fig. 4

Description

The present invention relates to a rolling stand comprising a device for controlling rolling stability by the preamble of claim 1.

The present invention is specifically a 4-Hi, 6-Hi, 18-Hi, and X-HI® stand comprising two working rolls, each working roll longitudinally at the stand. The working rolls are placed on each side of the pass line so that metal products such as moving strips can be rolled, and the working rolls are placed in exact working positions at least in the lateral direction (or longitudinal direction in consideration of the moving direction) of the rolling stand. With respect to 4-Hi, 6-Hi, 18-Hi, and X-HI stands arranged between the left and right support means that allow the working roll to be positioned.

A good example of a rolling stand (18-Hi type or X-HI® type) according to the present invention is described in two patents of the applicant, Patent Document 1, and in particular Patent Document 2, and Patent Document 2 Discloses methods and devices for offsetting the vertical axis of the working roll with respect to the axis of the intermediate support roll. The offset device is used to determine the first offset value and is ideally programmed with nominal rolling parameters that allow the force parallel to the moving plane of the strip acting on the working roll to be reduced. It is possible to change the first offset value to another offset value according to the identification of the "new" rolling parameters, depending on the specification at the beginning of the rolling. In this example, the rolling parameters originate from a data bank or are measured by a device for analyzing strip or rolling equipment characteristics, ancillary measurements of the position of the work roll, or measurements of the force acting on the work roll. It can be measured from the signal transmitted by. When the form or quality of the product to be rolled is changed, the position of the working roll can be changed according to the offset compliance conditions suitable for rolling the product. FIG. 1 of the present invention reproduces a very explanatory example of FIG. 1 of Patent Document 2. In the figure, the offset (0) means that the moving means (see actuator (63)) has a nominal rolling parameter. This is made possible by following corrections or corrections of position and force measurements such as those given by the measuring device (64). Further, the offset is controlled in a common manner for the upper work roll and the lower work roll.

As described below, Applicants, in anticipation of the favorable control of the offset of the pair of upper and lower working rolls as described in the patent above, in particular improve rolling productivity, i.e., move. We continue to investigate improvements to this type of stand with the aim of maximizing the rolling speed of the products we produce and ensuring constant rolling quality conditions. During such investigations, the phenomenon of unstable rolling stand operation in relation to the physical condition of one or more working rolls already arranged according to the offset, as described in the prior art. Has been detected. For example, a work roll may suddenly bounce, or other variations and instability of position around a predetermined offset (or a controlled offset as in the prior art), especially when reaching higher speeds of motion. , And / or sudden bounces, or forces on work rolls, i.e. other variations in force between longitudinal moving means as longitudinally arranged left and right supports on each side of each work roll. .. Finally, such bounces or other instability is not symmetrical between the upper and lower working rolls of the rolling stand, thereby sharing an offset with respect to the pair of working rolls as in the prior art. It should be noted that the method control is inadequate in terms of harmonizing the forces of the entire stand. As shown in the figure of the utility model application, especially when the rolling speed is increased, the upper part of the stand and the lower part of the stand become unstable against each other even when the offset is controlled as in the prior art. Longitudinal forces on the portion may be significantly increased, making it easier to stress the stand with a "double" absolute value.

European Patent No. 2542360 European Patent No. 2464470

One object of the present invention is a rolling stand for rolling a moving metal product, an upper work roll and a lower work roll that are already arranged according to a predetermined offset, at least of the product. It is to maximize the rolling speed while ensuring the stability of the operating state of the rolling stand, which includes at least an upper working roll and a lower working roll that can move parallel to the moving direction and with respect to the origin. Generally, the origin of the stand is defined as the intersection of the longitudinal axis and the vertical axis, the longitudinal axis is defined as the path line of the stand, and the vertical axis is rolled by direct contact with at least one of the working rolls. It is defined to pass through at least one of the upper and lower intermediate rolls that transmit force.

In particular, known conventional means for controlling rolling operating conditions as described in the prior art is an asymmetric anxiety during the transitional stages of increasing rolling speed, especially between the upper and lower stands. If the qualities further increase the force and stress and cause damage to the rolling mill, or if it actually causes damage to the rolling mill, it is not sufficient to properly compensate for rolling instability.

Such rolling instability causes a direct difference in the physical state of at least one of the two working rolls (as specified in FIG. 3 of the present invention). Therefore, an object of the present invention is to compensate for the difference in the physical state of at least one of the working rolls from the previous physical state when the rolling speed is increased, and to ensure the stability of the rolling conditions ( It is to allow products of constant quality (in terms of thickness, surface condition, etc.) to be discharged from the rolling mill. In other words, such a difference is that at least one position of the work roll becomes unstable around that position (a longitudinal offset occurs with respect to the origin of the stand), and the work roll and the left and right support rolls Left-right deformation of the stand (called warpage) (clamping called hyperstatic clamping, or excessive gap) that changes the left-right gap condition between, the force that the work roll receives (especially in the longitudinal direction) and Excessive fluctuations in torque, fluctuations in traction of products upstream and / or downstream from the stand interacting with at least one of the work rolls, sliding between the work rolls and the product or between rolls of the stand, In addition, it may have multiple causes such as thermal fluctuations of the stand as a whole. Moreover, the differences are local, i.e. individually affect each of the upper and lower working rolls in various forms.

Thus, for example, Applicants include two explanatory FIGS. 2 and 3 (a, b, c, d, e), and FIGS. 2 and 3 (a, b, c, d, e) Each of the rolling stand core embodiments is described and has a set of five measurements of various parameters of the rolling stand, the measurements having a type of instability associated with a working roll.

These figures, along with subsequent views of the utility model application, present a rolling stand (and related methods) comprising the device for controlling the working rolling stability of claim 1.

FIG. 2 shows a rolling stand (18-Hi type or X-Hi®) having two assemblies, an upper assembly and a lower assembly, for rolling a metal product (PM) moving in the longitudinal direction (X). ) Is shown in the partial side view (X, Z plane) of the embodiment, and this rolling stand is
-Between the upper intermediate contact roll and the lower intermediate contact roll, which are pressed vertically against each of the two work rolls (CTS, CTI) of the upper work roll and the lower work roll, respectively, to move each of the work rolls. Equipped with support rolls
-Each work roll is supported on each side in the left-right direction (longitudinal direction X) by one of the two left-right support means.
-In this example, the left and right support means are the left and right contact rolls (CALS1, CALI1) pressed against the work rolls (CTS, CTI) and the left and right contact rolls pressed against the left and right contact rolls in the lateral direction (direction Y). With two rows of contact rollers (GALS1, GALI1),
-By each left and right support means, a left and right contact roll and two rows of rollers are arranged on a rotation arm (BPS1) having a rotation axis parallel to the direction (Y), and the left and right contact rolls are brought into contact with the work roll. The contact must be maintained outside the excess rest area,
-Therefore, each left and right support means can be moved in the longitudinal direction (positive and negative directions X), whereby the left and right support means are not subjected to the force (FSup = 0t, Finf = 0t) applied by the work roll. In this case, a gap can be provided between the rotating arm (BPS1 or BPI1 in this example, respectively) and the longitudinal moving beam (PDS1, PDI1) capable of applying pressure in the left-right direction to the arm. .. This gap can be measured by a distance sensor (KYKsup, KYKinf) such as a plunging sensor arranged in the moving beam. On the contrary, when the left and right supporting means receive the forces (Fsup = + 20t, Finf = + 20t) applied by the working roll, the rotating arm (BPS2 and BPI2 in this example, respectively) and the left and right pressure are applied to the arm. The gap between the addable longitudinal moving beams (PDS2 and PDI2, respectively) is zero.
-The axes of the upper working roll (CTS) and the lower working roll (CTI) are actually always offset horizontally according to the offset (Off) with respect to the axis of each intermediate contact roll (CAIS, CAII). .. This configuration of the rolling roll is carried out by adjusting in the longitudinal direction the abutting beam acting on the rotating arm so that the left and right support means are arranged according to the offset.
− For clarity, a single offset is shown here, but it should be noted that the present invention addresses an issue where the offsets of the upper and lower working rolls may not be the same. I want to.
− Deformation gauges (GCS1, GCI1, GCS2, GCI2) are placed between each of the four longitudinal moving beams and their respective longitudinal thrust driving means (not shown). Thus, these gauges are longitudinally represented herein in tons when the force applied by the working roll is transmitted via the left and right support means to one of the beams coupled to the one gauge. Generates force (FSup, Finf).

In the rest of the specification, the longitudinal force measured in the deformation gauge has a positive or negative value. A positive or negative sign indicates that the working roll (eg, CTS) is (eg, rotating arm BPS1), taking into account that the working roll is ideally not overly stationary between its left and right supporting means. Alternatively, it indicates applying a force to one or the other of the left and right support means surrounding the working roll in the longitudinal direction (via BPS2 and its roll and roller rows).

In the example shown in FIG. 2, FIG. 3A shows the speed (in m / s) of the metal strip undergoing rolling passing through the stand for about 11 minutes (that is, the passing time corresponding to the rolling of the coil of the metal strip). The measured values (hours, minutes, and seconds) of. In order to achieve maximum rolling productivity, the speed of the stand is increased between two main time intervals, ie, the speed increases from 0.5 m / s to 2 m / s at 11:02:00 and 11:03:00. The first interval (P1) between them and the second interval between 11:06:30 and 11:08: 00 when the velocity increases from 2 m / s to 4.5 m / s around the vertical dotted line (P1). It should be noted that it is significantly enhanced between P2) and.

FIG. 3B shows a longitudinal force applied by the upper working roll onto one of its first left and right support means or second left and right support means at the same two time intervals as FIG. 3A. The measured value of (FSup) (= traveling direction) is shown. The left and right support means can also move the work roll at least parallel to the moving direction of the product and have the function of arranging the working roll according to the offset with respect to the origin described above. To prevent excessive rest of the work roll, the work roll is placed between two left and right support means with sufficient spacing, which allows the roll to rotate completely between the left and right support means. It should be understood that the roll ensures that there is a lateral clearance to ensure contact, while longitudinal forces are applied to only one side of the working roll.

Specifically, FIG. 3 (b) shows that in the initial state of metal strip rolling conditions, the upper working roll is placed in one of the left and right supporting means before the interval (P1), in this case about −10. Indicates that tons of force are applied. A negative value of -10t indicates that the working roll applies a longitudinal force opposite to the strip moving direction. During the first interval (P1), a first increase in velocity occurs, the longitudinal force (FSup) exhibits a force variation of 5 tons, and then returns to an initial value of about -10 tons of force. Therefore, a difference in the physical state of the upper working roll is observed, and then the initial state is returned. Then, during the second interval (P2), a second increase in velocity occurs, showing a longitudinal force (FSup) of about 60 tonnes, or more specifically, a force variation from -10 tonnes to +50 tonnes. This means that the physical state of the work roll has changed as long as the measured values indicate that the work roll has moved from the first left and right support means of the work roll to the second left and right support means. Therefore, the apparent instability of the physical state of the working roll is detected. That is, the force (FSup) of the work roll applied to the second left and right support means of the work roll reaches +50 tons, which is five times higher than the initial value of -10 tons in terms of absolute value. Large force fluctuations can cause warping (deformation) in the structure of the stand (columns, supporting means, and lateral moving means), or worse, damage to the internal components of the stand or other types of damage. May occur. In this example, the operator reduces the rolling speed of the strip back to lower force conditions, in which the force gradually decreases from +50 to -30 tonnes in an unstable state. As a matter of course, if the speed is reduced, the rolling productivity is significantly reduced and the business owner suffers a loss.

FIG. 3 (c) shows the lower working roll having a function of moving the lower working roll at least parallel to the moving direction of the product and arranging the lower working roll according to the offset with respect to the origin, as in the case of FIG. 3 (b). The measured value of the longitudinal force (Finf) (= traveling direction) applied by the lower work roll to one of 1 left-right support means or 2 second left-right support means is shown. Specifically, FIG. 3 (c) shows that in the initial state of metal strip rolling conditions, the lower working roll has a force of about -10 tonnes on one of the left and right supporting means before the interval (P1). Indicates that A negative value of -10 tonnes indicates that the working roll applies a longitudinal force in the direction opposite to the strip moving direction. During the first interval (P1), when the first increase in velocity occurs, the longitudinal force (Fimph) shows a force variation of 10 tonnes and then reaches a new value of about -20 tonnes, thus the lower part. Differences in the physical state of the working rolls are observed, followed by a new physical state with a constant load of -20 tonnes. Then, during the second interval (P2), when a second increase in velocity occurs, the longitudinal force (Fimph) fluctuates from about 60 tonnes, or more specifically -20 tonnes to -80 tonnes. This indicates that the physical condition of the working roll has been modified in terms of force fluctuations while maintaining contact with the same left and right support means. Therefore, the apparent instability of the physical state of the working roll is detected. That is, the force (Fimph) of the work roll applied to the left and right support means of the work roll reaches -80 tons, which is eight times more than the initial value of -10 tons in terms of absolute value. Large force fluctuations can cause the structure of the stand (columns, supporting means, and lateral moving means) to warp (deform), or worse, to destroy or other types of internal components of the stand. Damage may occur. In this example, the operator reduces the rolling speed of the strips back to lower force conditions, in which the force gradually decreases from -80 tonnes to -10 tonnes in an unstable state. As a matter of course, if the speed is reduced, the rolling productivity is significantly reduced, and the business owner suffers a loss.

Finally, FIG. 3D, again according to FIG. 2, spans the same measurement period of the sensor that detects the distance between the upper rotating arm (BPS1) and the upper moving beam (PDS1), that is, the longitudinal gap. The measured value is shown. This configuration is intended to secure an operating gap between the upper work roll and at least one of the first left and right support means or the second left and right support means. In order to prevent the work rolls from being excessively stationary, each work roll includes two left and right support means (each of which includes a rotating arm, a left and right contact roll, and two rows of rollers). Sufficient spacing to ensure contact by applying longitudinal forces to only one of the left and right sides of the work roll, while ensuring that there is a lateral clearance that allows full rotation between them. It should be noted that it is understood that it is placed between the left and right support means.

Specifically, FIG. 3D shows the value of the upper rotating arm in the initial state of the metal strip rolling condition, before the interval (P1), between one of the longitudinal moving beams, in this case. Shows that it has an upper longitudinal gap (KYKsup) of about 2.6 mm. During the first interval (P1), when the first increase in velocity occurs, the upper longitudinal clearance shrinks from 2.6 mm to 2.5 mm and then returns to the 2.6 mm mean. .. However, in this case, the perturbation whose amplitude is less than 1/10 of 1 mm increases in direct proportion to the difference in physical state already observed in FIG. 3 (b). Immediately before the second interval (P2), an increase of 0.3 mm is observed. This increase corresponds to a slight variation in the upper force (Fsup) in FIG. 3 (b), but also shows another fundamental difference phenomenon. This difference phenomenon may be related, for example, to potential fluctuations in torque or traction applied to the upper working roll. Then, during the second interval (P2), when a second increase in velocity occurs, the longitudinal clearance shows a variation of about 0.6 mm, which variation is around (t = 11:08: 00). ) Further includes a sharp drop in which the measured value of the gap is at its minimum level, which means that the physical state of the working roll is corrected by force fluctuations, from one of the left and right supporting means to the other (in FIG. 2). It means that it is also corrected by the change of the support contact of the working roll (from BPS2 to BPS1). Therefore, the apparent instability of the physical state of the upper working roll is actually detected while the moving speed increases.

Similar to FIG. 3 (d), FIG. 3 (e) shows the sensor detection distance between the lower rotating arm (BPI1) and the lower moving beam (PDI1), that is, the longitudinal gap (KYKinf according to FIG. 2). The measured value is shown, and this configuration is a configuration intended to secure an operating gap between the lower work roll and at least one of the first left and right supporting means or the second left and right supporting means thereof.

Specifically, FIG. 3 (e) shows that in the initial state of metal strip rolling conditions, the lower rotating arm is between one of the longitudinal moving beams before the interval (P1), in this case average. It is shown to have a lower longitudinal gap (KYKinf) with a value of about 3.00 millimeters. During the first interval (P1), when the first increase in velocity occurs, the lower longitudinal clearance increases to 3.25 mm and then decreases to 3.20 mm. Immediately before the second interval (P2), an increase of 0.3 mm is observed. This increase is presumably similar to the variation in the clearance (KYKsup) measured by the distance sensor at the top. Then, during the second interval (P2), the variation still increases with the lower force (Fimph), reaching a clearance value of 4 millimeters. The physical state of the lower working roll is modified by force fluctuations (Fimph), but not by changes in the supporting contact of the lower working roll from one of the left and right supporting means to the other. Therefore, during this latter increase in rolling speed, the instability or difference in the physical state of each of the upper working roll and the lower working roll is actually clearly detected, and such instability or difference in the physical state is The characteristics of each of the upper working roll and the lower working roll are clearly quite different.

Considering that the lower work roll remains in contact with the same left and right support means, the two work rolls, the upper work roll and the lower work roll, exhibit asymmetric instability, especially in unstable positions, thereby (moving). It can be seen that the longitudinal gap (in the direction) increases and the rolling performance is almost certainly affected and reduced. Such effects can also be measured on several sensors located laterally (axially, direction Y in FIG. 2) of the roll, and such effects can be measured on the axes of the upper and lower work rolls. Defects in parallelism occur between them, which significantly affects the stability of rolling operating conditions, affects the components of the stand that are subject to excessively strong forces, and especially reduces the quality of products rolled at high moving speeds. Indicates that there is a possibility. Finally, the lower working roll remains in contact with one of its left and right support means, but has moved nearly 1 mm, thus almost certainly causing a significant warping effect in the left and right support means, or in fact. Note that it deforms the stand.

Therefore, such an effect of instability in the rolling stand limits the maximum rolling through speed and, in the worst case, can damage the components of the stand while the rolling operation is in progress, especially continuous. It is important to understand that the rolled product can also damage the components of the stand when it has various physical properties. Also, when the rolling line is operated for the first time, or when it is restarted for the first time after maintenance, it is very troublesome to predict such an effect, and the operator sets a very safe parameter value and then concretely. It is necessary to reduce the moving speed and start or restart the rolling line. After the rolled product is operated after ensuring that it has the desired quality (eg, constant thickness when ejected from the stand), the instability nevertheless persists. The rolling stand may still be forced to operate at a limited speed of movement. Therefore, another object of the present invention is to operate or restart the rolling stand with minimal rolling instability, in addition to the quality aspect of the laminated product and the predetermined and controlled offset. And to pursue this purpose during the production operating phase, which significantly increases productivity and ideally increases rolling speed.

With respect to the teaching by the pair of FIGS. 2 and 3 (a), 3 (b), 3 (c), 3 (d), and 3 (e), the present invention relates to the upper working roll (CTS) and A pair of lower working rolls (CTI) and a pair of upper and lower support rolls for 4-Hi, 6-Hi, 18-Hi, or X-HI® configurations and 6-Hi. A pair of upper intermediate rolls (CIS) and lower intermediate rolls (CII) for configuration, Z-High configuration, or X-HI® configuration, and capable of rolling a moving metal product (PM). A rolling stand equipped with a device for controlling rolling stability by positioning the working rolls.
-Each of the upper working roll (CTS) and the lower working roll (CTI) acts on one of the two surfaces of the metal product that moves horizontally along the longitudinal axis, and the rolling stand
− Upper length for moving the working roll with respect to a vertical axis passing through at least one of the intermediate rolls that transmit rolling force onto at least one of the upper working roll and the lower working roll by direct contact. The manual moving means and the lower longitudinal moving means, in which the longitudinal axis and the vertical axis define an intersection at the origin, and the work roll is located at a distance called an offset distance in the left-right direction with respect to the origin. The upper longitudinal moving means and the lower longitudinal moving means,
-A measuring means for measuring at least one measuring parameter, the measuring parameter being transmitted to a control unit that supplies a control signal to the longitudinal moving means, allowing the position of the working roll to be corrected. We propose a rolling stand equipped with a measuring means. The rolling stand according to the present invention
-Measurement parameters are associated with differences in the physical state of at least one of the working rolls from the previous physical state, ideally stable according to a predetermined offset.
-Measurement parameters take into account that a gap is provided between the roll (to prevent excessive rest of the work roll) and at least one of the two longitudinal moving means (unloaded). Then, the upper force (Fsup) and the lower force (Finf) applied by the work roll to the active measuring means coupled to the moving means that actually contacts each work roll and is loaded by the work roll. Each of the moving means is arranged on each side of the working roll in the longitudinal direction, comprising at least one of the longitudinal component values.
-In addition, all of the upper longitudinal moving means and the lower longitudinal moving means can be individually actuated to reposition the upper and lower working rolls according to their individual offsets in response to control signals. It is a feature.

In particular, the difference in physical state with respect to the simultaneous non-equivalent difference between the upper and lower working rolls is primarily at least one of the working rolls, referred to herein as stable for clarity. Instability of the position centered on the position of the work roll (= the position where a predetermined and controlled longitudinal offset is applied with respect to the origin of the stand), loosen the work roll or vice versa. Left-right deformation of the stand, which causes the work roll to move too much or vice versa, excessive fluctuations in the force and torque that the work roll receives, and a stand that interacts with at least one of the work rolls. It should be noted that it may have multiple causes such as fluctuations in the traction of the product upstream and / or downstream from, slipping between the work roll and the product or between the rolls of the stand. Thermal effects or swelling of components are other basic elements that may further influence the above-mentioned effects.

Therefore, for example (see FIG. 3D), when the upper working roll suddenly changes the left-right contact position between the two left-right supporting means to any side of the roll, one of the longitudinal moving means. It is possible to compensate for contact instability during increasing movement speed by individually changing at least one position, the purpose of which is, for example, to reposition the upper working roll into a more stable physical state. Is.

Similarly, in the case of FIG. 3E, the problem is that the warp of the stand is remarkable, and the position of the longitudinal moving means for moving the lower work roll exerts another strong force that causes the warp. To be able to reduce the degree, it is changed at least until the repositioning of the upper working roll is established in a more stable physical state as described in the previous paragraph.

In addition, the upper and lower working rolls come into contact in a more stable physical state when the difference in at least one of the forces measured on the upper and lower working rolls or their gradient exceeds a safe threshold. The longitudinal moving means for moving the upper working roll and the lower working roll can be individually controlled so as to change the position of the roll, and a safe threshold is set so that one of the working rolls is left and right. It is mainly associated with situations where the contact position is changed and / or excessive force is applied to one of the left and right contact means (= longitudinal moving means) of the work roll. Anxiety about rolling one or more of the rolls into a predetermined model for detecting the above-mentioned situation of differences in at least one physical state of the upper work roll and one or both of the lower work rolls. It can also be stored in the control unit to apply a proactive repositioning mode to the stand that protects against qualitativeness.

Therefore, such rolling stands are robust against any rolling instability, especially with respect to non-incidental differences in the physical state of the working rolls at the top and bottom of the stand, and thus advantageously move speeds ( Therefore, rolling productivity) is enhanced. With reference to the set of FIGS. 3 (a) to 3 (e), at least one of the forces (Fsup, Finf) measured at the upper or lower part of the stand on each active measuring means (measuring the load). It can be seen that when one of the absolute values increases, the most significant difference is actually detected in that there is a high risk of increased force during the steps of increasing the rolling speed.

Therefore, Applicants respond to at least two longitudinal force parameters (FSup, Finf) measured simultaneously in each of the active measuring means coupled to the means for moving each of the upper working roll and the lower working roll. It was possible to improve the control of rolling stability by the control. Specifically, by considering these two parameters at the same time, not only the incidental difference in the physical state of the upper working roll and the lower working roll is detected more dynamically, but also the step of increasing the rolling speed in particular. It has become possible to detect non-incidental differences between.

Thus, by such control means, the control signal is a logical, algebraic, or number-theoretic function of the longitudinal force component (FSup, Finf) measured by each of the upper and lower work roll measuring means, respectively. Functions can be reliably included.

Therefore, in this case, the significantly simplified control signal is the relative value (FSup-Fimph) of the forces of the two forces (FSup, Finf) measured by each of the measuring means of the upper work roll and the lower work roll, respectively. Can include functions. That is, in most cases, the force in one of the upper working rolls or the lower working roll increases and then in the other roll, or as the force in one roll increases, the force in the other roll increases. .. Therefore, when the forces on the upper and lower working rolls are opposite in the longitudinal direction, this difference in force provides a highly sensitive, high-speed detection means during the step of increasing the rolling speed.

In addition, the control signal can include a function of two force (FSup + Finf) added values (FSup + Finf) measured by each of the lower roll and upper roll measuring means, respectively. That is, in most cases, the force in one of the upper working rolls or the lower working roll increases and then in the other roll, or as the force in one roll increases, the force in the other roll increases. .. Therefore, when the forces on the upper working roll and the lower working roll are opposite in the longitudinal direction, the sum of these forces provides a highly sensitive high speed detection means during the step of increasing the rolling speed.

The control signal is measured by each of the lower working roll and upper working roll measuring means, taking into account that the difference in the physical state of the working rolls may have linear or non-linear behavior, respectively. It can include a function of at least one algebra or logical value of a linear or non-linear combination of forces.

Taking into account the large number and complexity of difference scenarios, we measure additional information so that rolling instability can be better detected and then controlled, thereby the current instability category. Can be shown even better.

Therefore, the measurement parameters can include:
-At least one measurement of longitudinal movement of the lower and upper working rolls. The value is either a relative value or an absolute value. Ideally, this parameter ensures that the prior position of the longitudinal moving means, specifically the starting position of the programmed new rolling, is known.
-At least one measurement of the torque applied to the upper and lower working rolls. The value is either a relative value or an absolute value. This measurement makes it possible to detect instability more precisely than force measurements, especially when the torque can be controlled individually, for example when the lower and upper rolls are driven separately. ..
-At least one measurement of the distance and contact between the upper and lower working rolls and their left and right contact rolls. The technical advantages will be described in detail below in the present invention.

Finally, in the devices according to the invention, in all of the aforementioned types, at least two measuring means per roll are reliably placed in a plane traversing the longitudinal direction in which the product travels. In this way, it is also possible to better detect the difference due to the fluctuation between the axes of the working roll. Therefore, the repositioning is done by a longitudinal moving means from at least one roll positioning element at the end of the roll to a series of elements for moving the roll that are continuously arranged in a plane traversing the longitudinal direction. It can be established more easily and quickly.

In particular, the moving element comprises a roll, roller, or pad, which supports the working roll in the lateral direction, i.e., laterally under directional thrust primarily directed in the longitudinal direction. Supporting working rolls in, the element is particularly suitable for 18-Hi stands or X-HI® stands.

Finally, according to the example in FIG. 2, the axes of the working rolls are aligned according to a positive offset on a single side of the axes of the intermediate rolls, and the axes of the upper and lower working rolls are no longer aligned with each other. In the absence (not actually aligned), the prior art control devices have reached their limits and it is clearly stated that the roll behavior, specifically the non-incidental behavior, cannot be fully considered. Therefore, the device according to the present invention is advantageous in that the parameters measured and used for control are considered separately, but also in mind that the upper and lower stands are considered together (in the form of a function). It makes it possible to exceed this limit.

To this end, the device can be further improved in that it comprises at least four distance sensors rather than the two sensors (KIKsup, KIKinf) of FIG. Therefore, each of the four longitudinal moving beams comprises at least one laterally, ideally two such distance sensors. That is, the control of the position change of the working roll by the longitudinal moving means according to the force (FSup, Finf) measured by the active measuring means (under load) is such that the roll actually supports the roll in the left-right direction. Provides information about the side to be pressed, but the actual position of each of the two left and right support means introduces an unknown that makes the measurement of the actual position of the work roll (and the relative position of the particularly important work roll) inaccurate. To do. A single sensor on each of the two beams upstream from rolling is one way to locate the working roll, but when there are additional effects such as warpage (one of the sensors no longer signals). (Do not supply), positioning is distorted. To this end, each moving beam is provided with such a distance sensor for measuring the clearance between each beam and the left and right support means (rotating arm, left and right contact rolls, and row of contact rollers). In this case, the positioning of each working roll in the frame of reference coordinate system of the warped stand is improved, and thus it becomes possible to control the repositioning of the means for moving the working roll more tightly. In short, at least one separation distance sensor is located within each of the four moving means of the four moving means arranged on each side of the upper working roll and the lower working roll in the left-right direction, that is, specifically, four longitudinals belonging to the means. Arranged between the directional moving beams, each of the beams acts on one of the four movable left and right supporting means of the upper working roll and the lower working roll.

The rolling stand according to the present invention is also used to implement a method for controlling the positioning of the upper and lower working rolls of a rolling stand for rolling horizontally moving metal products called the longitudinal direction. Also possible, the first parameter (FSup) is measured as the longitudinal component applied by the first working roll of the two working rolls to its respective active measuring means, and then at least the first parameter is When it deviates from the specified allowable range, it is transmitted to the control unit acting on the longitudinal moving means for moving the first working roll.

Further, in the control method, a second parameter (Fimph) is simultaneously measured as a longitudinal component force applied by the second working roll of the two working rolls to its respective active measuring means, and then , At least when the difference between the second parameter or the first parameter and the second parameter is out of the specified tolerance, it is determined that it is transmitted to the control unit acting on the longitudinal moving means for moving the working roll. Be done. By considering the first and second parameters in the upper and lower stands in this way, it is advantageous to take into account the physical condition of the upper and lower working rolls, as shown by the curve in FIG. It allows better control when non-incidental differences occur. Thus, in other words, in this method, all upper longitudinal moving means and lower longitudinal moving means are individually repositioned so as to reposition the upper working roll and the lower working roll according to individual offsets in response to control signals. Activate.

The set of dependent claims also describes an advantageous embodiment of the present invention.

Embodiments and application examples will be described with reference to the figures described below.

This is a reproduction of a very explanatory example of FIG. 1 of Patent Document 2. A rolling stand (18-Hi type or X-Hi® type) having two assemblies, an upper assembly and a lower assembly, for rolling a metal product (PM) moving in the longitudinal direction (X). A partial side view (X, Z plane) of the embodiment is shown. (A) is a measured value (hours, minutes, and a passing time) of about 11 minutes (that is, a passing time corresponding to rolling a coil of a metal strip) at a speed (in m / s unit) at which the metal strip to be rolled passes through the stand. In seconds), (b) is the length applied by the upper working roll onto one of its first left and right support means or second left and right support means at the same two time intervals as in (a). The measured value of the directional force (FSup) (= traveling direction) is shown, and (c) moves the lower working roll at least parallel to the moving direction of the product and arranges it according to the above offset with respect to the origin, as in (b). Measured value of longitudinal force (Fimph) (= traveling direction) applied by the lower working roll to one of the first left and right supporting means or the second left and right supporting means of the lower working roll having a function capable of performing. (D) shows the measured values of the sensor that detects the distance between the upper rotating arm (BPS1) and the upper moving beam (PDS1), that is, the longitudinal gap, over the same measurement period, according to FIG. (E) shows the measured value of the sensor detection distance between the lower rotating arm (BPI1) and the lower moving beam (PDI1), that is, the longitudinal gap (KYKinf according to FIG. 2). It is a figure which shows the embodiment of the rolling stand by this invention (side view). FIG. 4 is an enlarged view of the stand according to FIG. It is a partial top view of the stand according to FIG. 4 or FIG. It is a figure which shows the example of the extended parameter of an additional measurement suitable for measuring the difference in the physical state of at least one of work rolls. It is a figure of the multi-stand control method by this invention.

FIG. 4 shows an embodiment of a rolling stand according to the present invention of 18-Hi type or X-HI® type in this example. The stand is shown in this case, for example, in a side view from the operator side (or at least from the drive side provided with an extension and a drive unit to drive the rolls of the stand).

The rolling stand has a pair of upper abutment rolls (CAS) and lower abutment rolls (CAI) and upper intermediate rolls (CIS) and lower intermediate rolls (CIS) on each side of the pass line of the moving metal product (PM). It includes a pair of CII) and a pair of working rolls (CTS, CTI). This stand is equipped with a device for controlling rolling stability by positioning the working rolls so that moving metal products (PM) can be rolled.
-Each of the upper working roll (CTS) and the lower working roll (CTI) acts on one of the two surfaces of the metal product that moves horizontally along the longitudinal axis (X), and the stand.
-Direct contact with the operator side of the stand (and the drive side of the stand (not shown) passes through at least one of the intermediate rolls that transfers the rolling force onto at least one of the work rolls. At least four longitudinal moving means (MDS1, MDS2, MDI1, MDI2) for moving at least one of the working rolls with respect to the vertical axis (Z), the longitudinal axis (X) and the vertical axis. (Z) defines an intersection at the origin (O), and the work roll is located at a distance called an offset distance in the left-right direction with respect to the origin (O).
-Therefore, each of the upper working roll and the lower working roll is arranged longitudinally between at least two of the upper or lower moving means, and the stand is
-Measuring means (MMS1, MMS2, MMI1, MMI2) for measuring at least one measuring parameter (P), and the measuring parameter is a control signal (Sup1, Sinf1, Sup2, Sinf2) to the longitudinal moving means. With measuring means, which is transmitted to the control unit (UC) that supplies
− Measurement parameters are associated with differences in the physical state of at least one of the working rolls with respect to a physical state called the stable physical state.
-Measurement parameters take into account that a gap is provided between the roll and at least one of the two moving means (the unloaded moving means) (to prevent excessive rest of the working roll). Then, at least one of the forces (Fsup1, Finf1, Fsup2, Finf2) applied by each working roll to the active measuring means coupled to the moving means which is actually in contact with the roll and loaded by the roll. Each of the moving means is arranged on each side of the working roll in the longitudinal direction, including one longitudinal component value.

Finally, all of the upper longitudinal moving means and the lower longitudinal moving means are individually offset (Offs,) depending on the control signal, as shown in FIG. 5, which shows an enlarged view of the central portion of the stand according to FIG. It can be individually actuated to reposition the upper working roll (CTS) and the lower working roll (CTI) according to Offset).

Thus, each of the upper and lower work rolls, whether individually generated or not, is specifically transmitted by various longitudinal forces due to a plurality of reasons already described in the present invention. One of the differences in the state may occur. Thus, given an offset, it is possible to provide a correction model for the force applied to each work roll by modifying at least one of the longitudinal moving means, depending on at least one starting difference. is there. This modification can temporarily correct the offset of each work roll, but the purpose of this transition stage is to balance the forces according to the physical state of each and all of the upper and lower work rolls. That is.

As already described with reference to FIGS. 2 and 3 (a) to 3 (e), instability with respect to the working roll position between the two left and right support means (related to the longitudinal moving means), or (and). Instability with respect to longitudinal forces with a significant gradient (or / or) often occurs at higher strip movement rates. Therefore, it is advantageous to be able to converge the unstable state of at least one of the working rolls to the stable state of the two working rolls. For this reason, the forces are balanced so as not to create instability that adversely affects the stand or at least adversely affects rolling productivity. Specifically, if such instability can be detected by longitudinal force measurement on the working roll, the control signal will be each measured depending on the active or passive state of the measuring means of the upper and lower rolls, respectively. It can be seen that it can be a logical function, an algebraic function, or an arithmetic function of the longitudinal force component (Fsup1, Finf1, Fsup2, Finf2) measured by the means. In this way, correction modes are applied to the longitudinal moving means to compensate for the particular instability, depending on the various scenarios of potential instability.

Experience has shown that measurements are made on the upper and lower work rolls with the aim of better detecting differences in physical state on one of the work rolls or better detecting differences in physical states on both work rolls at the same time. The difference in the (absolute) value of the longitudinal force component to be made is a very good measurement that is dynamic in detecting instability when there is a difference in the physical state of at least one of the working rolls. Is known to constitute. Therefore, more generally, the control signal is
-(Fsup) is at least one of the forces exerted by the upper working roll on the active measuring means coupled to the moving means which is actually in contact with the upper working roll and loaded by the upper working roll (Fsup1 or Fsup2). It is a measured value of
-(Finf) is at least one of the forces applied by the lower working roll to the active measuring means coupled to the moving means which is actually in contact with the lower working roll and loaded by the lower working roll (Finf1 or Finf2). Considering that it is a measured value of
It is a function of the relative values of the forces of the two forces (FSup, Finf) measured by each of the lower roll and upper roll measuring means [(FSup1 or Fsup2)-(Fimph1 or Finf2)], or this function. It is advantageous to be able to include.

Similarly, the control signal is a function of the add-on value (Fsup + Finf) of the two forces (Fsup, Finf) measured by each of the lower roll and upper roll measuring means, respectively, or a function of this function. It can also be improved in that it can be included.

Finally, the rolling stand according to the invention makes the control signal a function of at least one algebra or logical value of a linear or non-linear combination of forces measured by each of the lower roll and upper roll measuring means, respectively. Can be ensured. That is, as already described, the effects of instability can be detected, for example, under complex conditions that require non-linear techniques.

FIG. 6 shows a partial top view of the stand according to FIGS. 4 and 5, showing the longitudinal moving means in more detail. The longitudinal moving means (MDS1, MDS2, MDI1, MDI2) are continuously arranged in a plane (Y) traversing the longitudinal direction (X) from at least one roll positioning element at the end of the roll. A roll positioning element up to a series of elements for moving the roll. The moving element comprises a roll, roller, or pad, the roll, roller, or pad supporting the working roll in the left-right direction, i.e., supporting the working roll under directional thrust primarily directed in the longitudinal direction. The element is particularly suitable for 18-Hi stands or X-HI® stands.

To clarify the figure, according to FIGS. 4 and 5, FIG. 6 shows an example of an upper working roll (CTS) that is pressed laterally against the longitudinal moving means (MDS1). The longitudinal moving means (MDS1) is continuously from the work roll.
-Upper left and right contact roll (CALS1) and
-With one or more rows of left and right contact rollers (GALS1),
-When pressure is applied, the assembly in the row of the upper left and right contact rolls (CALS1) and the left and right contact rollers (GALS1) is rotated with respect to the work roll (CTS) to rotate the assembly and the work roll (CTS). The upper rotating arm (BPS1), which has the function of contacting
− Separated laterally (in this example, near the end of the rotating arm) to secure the upper working roll by applying lateral pressure (left side in FIG. 4) and contact the upper rotating arm It comprises an upper moving beam (PDS1) that acts by longitudinal thrust by one or more drive units (MOTS1, MOTS1') arranged so as to. Specifically, the lateral drive unit can be driven intensively or separately to compensate for the action of tilting the work roll axis with respect to the lateral axis (Y).

FIG. 6 also shows additional measuring means coupled to a feasible control unit (UC) for embodiments of rolling stands according to the present invention.
-The upper longitudinal force measuring means (see MMS1 on the left of the stand in FIG. 4) is composed of, for example, strain gauges (GSC1, GSC1') arranged between each drive unit and the upper moving beam. Will be done. This means that the measurement parameter (P) is at least the force applied by the upper working roll when the active measuring means coupled to the moving means comes into contact with the upper working roll and is loaded by the upper working roll. It means that it contains at least one longitudinal component value of one (Fsup1).
-At least one distance sensor or reader (CDS1, CDS1') through which the moving beam (PDS1) passes is placed while operating one or more of the respective drive units. This means that the measurement parameter (P) includes at least one longitudinal movement measurement of the upper work roll and the lower work roll (and the axial movement measurement if there is an inclination with respect to the horizontal axis Y). However, the value is a relative value or an absolute value.
-At least one distance sensor (KYKS1, KYKS1') for measuring the gap between the rotating arm and the moving beam and checking if there is a gap between the arm and the beam. Therefore, the measurement parameter (P) includes at least one measurement of separation and contact between the upper working roll and its left and right contact rolls.

The parameter (P), in the example of FIG. 6, favorably allows a plurality of measurement parameters (longitudinal force, distance measurement,) to more closely characterize the physical state and potential differences of the work roll. Note that it includes gap or gap measurements). The force received by the working roll is measured using longitudinal force measurement. Therefore, each case of active support, release or separation, and zero support of the work roll for a given offset, using additional knowledge about the position of the longitudinal moving means and the left-right abutment shape that can move within the stand. Can be determined. Therefore, as a result of this additional information, the control signals (Sup1, Ssup1') issued by the control unit (UC) to the longitudinal moving means detect at least one significant difference in the physical state of the working roll. It is a logical, algebra, or arithmetic function of multiple complementary signals to not confuse this difference with variations in roll gaps that do not affect a given offset within the tolerance range.

FIG. 7 shows an example of extended parameters of additional measurements suitable for measuring differences in the physical state of at least one of the working rolls. Parameter (P) detection is performed by several measurements associated with the force (Fsup1), position (X1), active or passive contact between the left and right elements (beam / arm) associated with the work roll. Similar to FIG. 6, FIG. 7 shows an enlarged view of a sensor (KYKS1) for measuring the gap between the rotating arm and the moving beam.

Finally, FIG. 7 shows two separate additional measuring means that at least partially contribute to longitudinal force measurements:
-A means for measuring the torque applied to the upper working roll (CTS) by the upper intermediate roll (CIS). Therefore, within the scope of the present invention, the knowledge of longitudinal forces measured for working rolls with differences in physical conditions can be used to determine if the actual torque value may deviate from the threshold. It is possible to ascertain that deviations from the threshold may cause this difference, in which case the longitudinal moving means of the roll is controlled to compensate for torque errors and therefore measurement parameters ( Pc) includes at least one torque measurement value applied to the upper working roll and the lower working roll, the value being either a relative value or an absolute value.
-A means for measuring one or more strip traction parameters (Pts) upstream and downstream from the contact area where the work roll contacts the moving product. Again, it is useful to know the contribution of the traction to the potential difference in the physical state of the working roll that causes variations in the measured longitudinal force characteristics of the product traction.

Therefore, for all embodiments of the device, in the method for controlling rolling stability according to the present invention, the first additional parameter is two operations, an upper work roll and a lower work roll with respect to the vertical axis (Z). A control unit that acts on the longitudinal moving means of the working roll when it is simultaneously measured as the longitudinal position of the center of the roll and then the relative difference between at least two of the parameters is out of the specified tolerance. Will be sent to.

In the method for controlling rolling stability according to the present invention, a second additional parameter (Pc) is also simultaneously measured as a transmission torque acting on each of the two working rolls, the upper working roll and the lower working roll. Then, when the relative difference between at least two of the parameters is out of the specified tolerance, it is transmitted to the control unit acting on the longitudinal moving means of the working roll.

In the method for controlling rolling stability according to the present invention, the first additional parameter (Pt) is also used as a measure of traction of the metal product with respect to at least one of the working rolls, and at least among the parameters. When the relative difference between the two parameters of is out of the specified tolerance, it is measured at the same time.

In the method for controlling rolling stability according to the present invention, a second additional parameter (Xkyks1) also provides a separation and contact between the left and right supporting means of the upper and lower working rolls and the longitudinal moving beam. Then, when the relative difference between at least two of the parameters is out of the specified tolerance, it is transmitted to the control unit acting on the longitudinal moving means of the working roll.

FIG. 8 shows a multi-stand control method for stabilizing rolling according to the present invention, in which the rolling mill stands according to the present invention are arranged in order in the longitudinal direction.

In the control method, for a configuration in which several rolling stands (C1, C2, C3, etc.) are arranged in order in the longitudinal direction, at least a pair of parameters ({FSupk, Finfk} K = 2, 3, 4, etc.) is at least. A control unit that is measured as a longitudinal component force applied separately to the two working rolls of the upper and lower working rolls of each stand and acts on the longitudinal moving means of the working rolls of at least two of the stands. Is sent to (UC).

The control unit (UC) not only acts on the longitudinal moving means of at least two rolling stands located upstream and downstream of each other, respectively, but also, for example, changing the stand-to-stand traction of the moving strips. It also affects rolling process parameters by applying a new distribution of stand vertical clamping values across several stands, changing lubrication in one of the stands, and so on. The purpose is to reduce rolling instability when at least one of the stands exhibits rolling instability, while adhering to qualitative criteria for the final rolled product, especially at higher rolling speeds.

Therefore, the control unit (UC) acts as an automated device, allowing the measurement of one or more parameters and the control of longitudinal moving means and rolling process parameters in real time, thereby the force parameters. The value of the difference between the values or forces, especially while operating or reactivating one or more rolling stands, during a continuous multi-stand rolling process, while changing the type of product entering the rolling stands, and During the maintenance of at least one stand, specifically changing rolls depending on the situation does not exceed a predetermined threshold.

BPS1, BPI1, BPS2, BPI2 Rotating arm C1, C2, C3 Rolling stand CAIS, CAII Intermediate support roll CALS1, CALI1, CALS2, CALI2 Left and right support roll CAS, CAI Upper and lower support roll CDS1, CDS1'Distance sensor or leader CIS Upper intermediate roll CII Lower intermediate roll CTS Upper work roll CTI Lower work roll FSup1, Finf1, Fsup2, Finf2 force GALS1, GALI1, GALS2, GALI2 Left and right support rollers GSC1, GSC1'Strain gauge GCS1, GCI1, GCS2 KYKS1'Sensor KYKsup, KYKinf Distance sensor MDS1, MDS2, MDI1, MDI2 Longitudinal moving means MMS1, MMS2, MMI1, MMI2 Measuring means MOTS1, MOTS1'Drive unit O Origin P, Pc, Pt, Xkyks1 Measurement parameter , PDI1, PDS2, PDI2 Longitudinal moving beam PM Metal products Sup1, Sup1', Sinf1, Sup2, Sinf2 Control signal UC control unit

Claims (9)

A pair of upper working rolls (CTS) and lower working rolls (CTI) and a pair of upper intermediate rolls (CIS) and lower intermediate rolls (CII) are provided so that a moving metal product (PM) can be rolled. A rolling stand comprising a device for controlling rolling stability by positioning the upper working roll and the lower working roll.
-Each of the upper working roll (CTS) and the lower working roll (CTI) acts on one of the two surfaces of the metal product moving along the longitudinal axis (X), causing the rolling stand to act on one of the two surfaces.
-On a vertical axis (Z) that passes through at least one of the upper intermediate roll and the lower intermediate roll that transmits rolling force onto at least one of the upper working roll and the lower working roll by direct contact. On the other hand, the longitudinal moving means (MDS1, MDS2, MDI1, MDI2) for moving the upper working roll and the lower working roll, the longitudinal axis (X) and the vertical axis (Z) are the origins. A longitudinal moving means, wherein the intersection is defined in (O), and the upper working roll and the lower working roll are located at offset distances in the left-right direction with respect to the origin.
-Measuring means (MMS1, MMS2, MMI1, MMI2) for measuring at least one measuring parameter (P), and the measuring parameter is a control signal (Sup1, Sinf1, Sup2, Sinf2) to the longitudinal moving means. ) Is transmitted to the control unit (UC) that supplies the measuring means and
In a rolling stand equipped with
-The measurement parameters are related to the difference in the physical state of at least one of the upper working roll and the lower working roll from the previous physical state.
-The measurement parameter is the force (Fsup, Finf) applied by the work roll to the active measuring means coupled to the longitudinal moving means which is actually in contact with each work roll and loaded by the work roll. Contains at least one longitudinal component value of at least one of them
-The upper longitudinal moving means and the lower longitudinal moving means may be individually actuated to reposition the upper working roll and the lower working roll according to individual offsets in response to the control signal. A rolling stand characterized by being able to do it. A claim that the control signal is a logical, algebraic, or number-theoretic function of the longitudinal force component (Fsup, Finf) measured by each of the lower roll and the measuring means of the upper roll, respectively. The device according to 1. 1. The control signal is a function of a relative value (Fsup − Finf) of the two forces (Fsup, Finf) measured by each of the lower roll and the measuring means of the upper roll, respectively. Or the device according to 2. Claim that the control signal is a function of the additive value (Fsup + Finf) of the two forces (Fsup, Finf) measured by each of the lower roll and the measuring means of the upper roll, respectively. The device according to any one of 1 to 3. The measurement parameters are
-A measured value, which is at least one measured value of the lower working roll and the longitudinal movement of the upper working roll and is either a relative value or an absolute value.
-A measured value, which is at least one measured value of torque applied to the upper working roll and the lower working roll and is either a relative value or an absolute value.
-At least one measurement of separation and contact between the upper work roll and the lower work roll and the left and right contact rolls of the upper work roll and the lower work roll.
The device according to any one of claims 1 to 4, which comprises at least one measured value of. The device according to any one of claims 1 to 5, wherein at least two measuring means for each roll are arranged in a plane across the longitudinal direction in which the product moves. The longitudinal moving means (MD) is a roll from at least one roll positioning element at the end of the roll to a series of elements continuously arranged in a plane across the longitudinal direction for moving the roll. The device according to any one of claims 1 to 6, which is a positioning element. The moving element comprises a roll, roller, or pad, the roll, the roller, or the pad supporting the upper working roll and the lower working roll in the left-right direction, i.e., primarily oriented in the longitudinal direction. 9. A claim 9 that supports the upper working roll and the lower working roll in the left-right direction under directional thrust, and the element is particularly suitable for an 18-Hi stand or an X-HI® stand. Device. At least one separation distance sensor is moved in each of the four moving means laterally arranged on each side of the upper working roll and the lower working roll, that is, in particular, four longitudinal movements belonging to the moving means. Any of claims 1 to 10, which are arranged between the beams and each of the longitudinal moving beams acts on one of the four movable left and right supporting means of the upper working roll and the lower working roll. The device described in one item.

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