DE102022203100A1 - Roll stand and method for operating same - Google Patents

Abstract

The invention relates to a roll stand 10 for rolling a rolling stock, comprising: a roll stand stand 3 on the drive side and a roll stand stand 3 on the operating side, the pins of work rolls 1 being rotatably mounted in chocks in the two roll stand stands, adjusting devices 4 in the two roll stand stands Application of rolling forces via the chocks to the work rolls of the roll stand 10, at least one sensor 6, which is assigned to one of the two roll stand stands 3 for generating a measurement signal and an evaluation device 8 for evaluating the measurement signal with regard to the pressure exerted on the work roll by the adjusting devices 4 rolling forces. In order to better protect the measuring sensor from dirt and corrosion and, as a result, to achieve more precise measurement signals and control results, the roll stand according to the invention is designed in such a way that at least one hole 7 is made in at least one stand post of at least one of the roll stand stands 3, so that the Measuring sensor 6 is inserted into the bore 7 and is designed to detect the deformation of the bore 7 when the rolling force is exerted and to generate the measurement signal in such a way that it represents the detected deformation of the bore 7.

Description

The invention relates to a rolling stand for rolling a rolling stock and a method for operating the rolling stand. In particular, the invention relates to measuring rolling forces in a rolling stand.

In principle, various solutions are known in the prior art. This is what the international patent application reveals WO 2007/147766 A1 a device and a method for measuring the rolling force in a rolling stand using an ultrasonic transmitter-receiver arrangement. With this arrangement, a change in length in a post of a roll stand stand is measured due to an applied rolling force and this measured change in length is then converted into the desired rolling force.

The Chinese patent application also discloses CN 101695717 A a sensor for rolling force measurement, wherein the sensor is mounted on the outside of a stand post of the roll stand stand and there measures the changes in length of the stand post under load, ie with applied rolling force due to the deformation of a coil and then converts the measured change in length into the desired rolling force.

The rolling force is used for a variety of controls in the operation of the rolling stand and it is therefore desirable to be able to measure the rolling force precisely even with high dynamics.

However, inaccurate or incorrect rolling force measurements often occur in rolling operations. This can be caused by frictional forces, e.g. B. between the roll stand stands and the chocks for the support rolls in the roll stand or a non-homogeneous introduction of force into the traditional force measuring devices, e.g. B. due to corroded or deformed surfaces. These inaccurate force measurements then lead to quality problems in the rolling stock to be rolled or to destabilization of the rolling process, e.g. B. in the form of a lateral running of the ends of the rolling stock.

In the two patent applications cited above, the measuring sensors are attached to the outside of the roll stand stands and are therefore subject to the harsh conditions in the environment of a roll stand, such as. B. dirt and dust etc. delivered without protection. This also results in the risk of a certain degree of inaccuracy in the measurement results.

The invention is based on the object of providing an alternative rolling stand for rolling a rolled stock and an alternative method for operating the rolling stand, which enable a more precise measurement of the rolling force.

This task is solved with regard to the roll stand by the subject matter of patent claim 1. Accordingly, the roll stand according to the invention is characterized in that at least one hole is made in at least one stand post of at least one of the roll stand stands; that the measuring sensor is inserted into the bore and is designed to detect a deformation of the bore when the rolling force is exerted and to generate a measurement signal such that it represents the detected deformation of the bore.

The deformation of the bore recorded by the measuring sensors originally represents a post force in the respective roll stand stand. However, these post forces are directly proportional to the rolling force applied to the rolls. The post forces are converted into the actual rolling force using an evaluation device.

• Der Messgeber in den Bohrungen misst jeweils eine Ständerpfostenkraft, kurz Pfostenkraft. 2 x Pfostenkraft = Ständerkraft; 2 x Ständerkraft = Walzkraft des Walzgerüstes.

The following generally applies: Each roll stand has two roll stand stands; one on the drive side and one on the operating side. Each mill stand typically has two stand posts. The holes according to the invention are each made into the stand posts. From this it follows approximately:

• The measuring sensor in the holes measures a stand post force, or post force for short. 2 x post force = stand force; 2 x stand force = rolling force of the rolling stand.

In the bore, the measuring sensor is advantageously protected in particular against dirt in the surroundings of the rolling stand and against corrosion, so that its measurement signal is not distorted. Rather, the measurement signal from the sensor determined in this way according to the invention provides a reliable basis for calculating the desired rolling force by the evaluation device.

According to a first exemplary embodiment, the measuring sensor is inserted into the bore under a preload. The preload of the measuring sensors must be so great that the measuring sensors still rest in the bores even at maximum rolling force. The preload then defines an operating point for the sensor. A deformation of the bore can then be measured in the form of a change in the preload around the said operating point. Depending on the design of the sensor, the change in the preload compared to the operating point can be determined in the form of a change in the force acting on it in the bore or a change in the mechanical tension acting on it in the bore. Alternatively, the change in its preload can also be determined in the form of a change in a compression path by which the sensor is compressed in the bore compared to its relaxed state or compared to its compression in the operating point. Piezoelectric sensors or strain gauges, for example, are suitable as measuring sensors for installation in the bore under pretension.

Alternatively or additionally, other measuring sensors can also be inserted into the bore without preload. Suitable for this purpose are, for example, inductive displacement sensors that detect a deformation of the hole caused by the rolling force through a change in the electrical voltage induced in them, or laser-based displacement sensors that are designed to detect the deformation of the hole under loading by the rolling force by evaluating, for example, transit time differences in the values they output Capture light signals.

For a comparison of the stand forces acting on the drive side and the operating side of the roll stand, it is advantageous if at least one hole, each with at least one measuring sensor, is made in each of the two roll stand stands, preferably in each of the four posts of the two roll stand stands. Except for special requirements, it is generally advantageous if the stand forces on the operating side and the drive side are of the same magnitude.

The term “drive side” means the side of a roll stand on which the drives for the rolls of the roll stand are arranged. The “operating side” is opposite the drive side in the axial direction of the rollers and is intended for operators, e.g. B. freely accessible for changing rollers.

Providing a plurality of measuring sensors in a bore offers the advantage that a redundant measurement can be carried out, which also increases the accuracy of the calculated rolling force. The majority of sensors inserted into the bore can be based on the same or a different physical principle. The installation of measuring sensors that are based on a different physical principle would be a further measure to increase measurement accuracy.

In principle, measuring the deformation of the bore in the stand posts of the roll stand stands on the operating and drive sides of the roll stand and/or on the inlet and outlet sides of one of the roll stand stands is possible at any height of the posts of the roll stand stand. However, placing the holes and the measuring sensor located therein at the level of the horizontal rolling line offers the advantage that the forces to be measured are not influenced by frictional forces between the components and the stand posts. The holes should preferably be made perpendicular to the rolling line in an area of 200mm above to 200mm below the rolling line.

Installing the measuring sensors at the same height on all posts of the rolling stand stands involved in the roll stand increases the comparability of the deformations measured in the individual stands, because the deformations at the same height of the stand posts should be the same or at least similar.

If the holes for the measuring sensors are each in a plane perpendicular to the rolling forces applied by the adjusting devices, i.e. H. are introduced into the posts of the roll stand stands in a horizontal plane, this offers the advantage that the deformation of the bores to be detected also acts at least essentially perpendicularly on the measuring sensors. This advantageously applies regardless of whether the bore is made in the stand posts of the roll stand stands in the rolling direction or transversely to the rolling direction or at any acute angle to the rolling direction. In the case of vertically acting rolling forces, the horizontal alignment of the holes offers the advantage that the deformation of the holes does not act on the measuring sensor at an oblique angle, which advantageously makes coordinate transformation of the resulting measurement signals unnecessary.

The provision of bores for the measuring sensors in each of the roller stands on the inlet side in the inlet-side stand post, and on the outlet side in the outlet-side stand post, offers the advantage that the stand force of the respective roll stand can be determined by simply adding the two post forces measured by the measuring sensors.

The post forces determined according to the invention can be used for strip thickness control. For this purpose, the post forces determined on the inlet side and the outlet side in the stand posts of a roll stand stand are first added up to the stand force of the roll stand stand. This is done separately for the roll stand stands on the drive side and the operating side. The drive-side and operating-side stand forces determined in this way are added to the rolling force of the roll stand. This rolling force is then converted into the actual thickness for the rolling stock at the exit of the rolling stand. The actual thickness determined in this way is then output and preferably regulated as part of the strip thickness control to a predetermined target thickness for the rolling stock by issuing a suitably varied position control signal to the adjusting devices, again on the drive and operating sides, in particular the respective adjusting cylinders. In order to specify the result of the strip thickness control, an additional stand force measuring device can be provided in each of the two roll stand stands, for example below the chocks of the lower support roll of the roll stand, for directly measuring the stand forces in the two roll stand stands of the roll stand. The evaluation device in question is then designed to calculate the rolling force also taking into account the additionally measured stand forces.

In addition, a position control device can be provided for controlling the position control signal output to the adjusting devices to the target position represented by the position control signal output by the strip thickness control device.

The aforementioned advantages of the roll stand according to the invention also apply to the procedural solution to the problem of the invention according to claim 14.

Further advantageous embodiments of the roll stand according to the invention and the method according to the invention for its operation are the subject of the dependent claims.

• 1 das erfindungsgemäße Walzgerüst und einen dazugehörigen Walzgerüstständer in Einzelansicht mit einem ersten Ausführungsbeispiel für die Ausrichtung der Bohrungen für die Messgeber;
• 2 das Walzgerüst und den einzelnen Walzgerüstständer analog zu 1, allerdings mit einem zweiten Ausführungsbeispiel für die Ausrichtung der erfindungsgemäßen Bohrungen;
• 3 einen einzelnen Walzgerüstständer mit einem ersten Ausführungsbeispiel für die Banddickenregelung; und
• 4 den einzelnen Walzgerüstständer gemäß 3 mit einer alternativen Banddickenregelung

zeigt.Four figures are attached to the description, where:

• 1 the roll stand according to the invention and an associated roll stand stand in a single view with a first exemplary embodiment for the alignment of the bores for the measuring sensors;
• 2 the roll stand and the individual roll stand stands analogously 1 , but with a second embodiment for the alignment of the holes according to the invention;
• 3 a single roll stand stand with a first embodiment for strip thickness control; and
• 4 according to the individual roll stand stands 3 with an alternative strip thickness control

shows.

The invention is described in detail below with reference to the figures mentioned in the form of exemplary embodiments. In all figures, the same technical elements are designated with the same reference numerals.

1 shows the rolling stand 20 according to the invention for rolling a rolling stock in its right-hand illustration. The roll stand 20 consists of a roll stand stand 3 on the drive side AS and a roll stand stand 3 on the operating side BS, the two roll stand stands being connected to one another via crossheads. In the two roll stand stands 3, the pins of both the support rolls 2 and the work rolls 1 are rotatably mounted in chocks. The installation pieces are shown in the left picture 1 to be recognized and designated there by the reference number 13.

An adjusting device 4 is shown for applying a stand force via the chocks 13 and the support rolls 2 to the work rolls 1. The sum of the stand force of the drive-side roll stand stand and the stand force of the operating-side roll stand stand is the so-called rolling force of the roll stand.

In the right illustration of 1 The holes 7 according to the invention can be seen, into each of which a measuring sensor 6 is inserted. The measuring sensors 6 are designed to generate a measurement signal, which indicates a deformation of the holes in the stand posts 3a, 3b of the respective roll stand stand 3 is represented in accordance with the stand forces or rolling forces applied by the adjusting devices 4.

As shown in the left figure in 1 can be seen, the adjusting device 4 acts in the vertical direction. In order to be able to determine a maximum effect of the changes in length of the roll stand stand caused by the rolling force and the associated deformation of the bore 7 with the measuring sensors 6, it is advantageous if the bores are in a plane perpendicular to the rolling force acting, ie as in the case in the Embodiments shown in the figures are formed in a horizontal plane.

At the in 1 In the first exemplary embodiment shown, the bores 7 are arranged lying in this horizontal plane and are aligned in the direction of the longitudinal axes of the rollers 1, 2, ie transversely to the rolling direction; see illustration on the right. It can be seen that a measuring sensor 6 is arranged in bores in each of the two roll stands 3 and also in each of the respective stand posts 3a, 3b of one of the two roll stands; Overall, there are therefore in the in 1 shown rolling stand four measuring sensors 6 for measuring the deformation of the holes into which they are each inserted.

In the 1 Sensors 6 shown are arranged in bores 7, which are each mounted at the same height, namely at the height of the roll gap spanned by the work rolls 1. This also applies to the in 1 special case shown, according to which the work rolls exceptionally do not create a roll gap; However, the bores 7 and the measuring sensors 6 are arranged here at the height within the roll stand stands at which the two work rolls 1 each touch each other.

The left figure shows an individual roll stand stand 3; it is constructed analogously for the drive side AS and for the operating side BS.

2 differs from that 1 simply because the bores 7 for the measuring sensors 6 are aligned here in the rolling direction. Also with the in 2 In the second exemplary embodiment shown for the alignment of the bores 7, it can be seen that these bores lie in a horizontal plane which is arranged perpendicular to the acting rolling force and that the measuring sensors 6 are arranged at the height within the roll stand stands at which the two work rolls are located 1 touch.

• Die aktuelle Ist-Banddicke h_ACT im Walzspalt wird berechnet, indem von der Summe der Kalibrierpositionen s_oAS, s_oBS die Summe der Zylinderpositionen s_ACTAS, s_ACTBS von jeweils den Anstelleinrichtungen auf der Antriebsseite AS und der Bedienseite BS und die Dehnung des Gerüstes g_ACT(F_WACT) abgezogen wird. Die Dehnung des Gerüstes ist dabei eine Funktion der Walzkraft und wird durch Einsetzen der Walzkraft in einem Gerüstmodell bestimmt.

$$h_{ACT}=\left({\text{s}}_0{}_{\text{AS}}+{\text{s}}_0{}_{\text{BS}}\right)/2-\left({\text{s}}_{\text{ACTAS}}+{\text{s}}_{\text{ACTBS}}\right)/2-{\text{g}}_{\text{ACT}}\left({\text{F}}_{\text{WACT}}\right)$$

• h_ACT Ist-Dicke des Walzgutes
• s_ACTAS, s_ACTBS Ist-Position der Anstelleinrichtung auf der Antriebs- und der Bedienseite
• s_oAS, s_oBS (Kalibrier-)Position der Anstelleinrichtung beim Kalibrieren mit einer Kalibrierwalzkraft auf der Antriebs- und auf der Bedienseite,
• F_WACT Ist-Walzkraft
• g_ACT Ist-Gerüstdehnung

3 shows a first exemplary embodiment of the strip thickness control according to the invention for regulating the actual thickness h _ACT of the rolled stock to a predetermined target thickness, in 3 designated by the reference symbol h _REF . The strip thickness control according to the invention provides that the post forces F _Pf are measured with the preferably four measuring sensors 6 according to the invention in their associated bores on the inlet side E and the outlet side A of the roller stands 3 on the drive and operating sides AS, BS (the latter not shown). . Subsequently, the actual rolling force F _WACT is calculated as the sum of these four measured post forces F _Pf : F _PfAS , F _PfBS using the evaluation device 8. If the post forces F _Pf can only be measured in two of the four posts, these two post forces are added up and the sum is multiplied by 2 in order to at least approximately calculate the actual rolling force. The actual rolling force F _WACT is then converted into the actual thickness h ACT using the conversion device 9, taking into account the actual cylinder positions s _ACTAS , s _ACTBS in the adjusting devices 4 in the two roll stand stands 3 on the drive side AS and the operating side _BS of the rolling stock in the exit of the rolling stand is calculated as follows:

• The current actual strip thickness h _ACT in the roll gap is calculated by taking the sum of the calibration positions s _oAS , s _oBS , the sum of the cylinder positions s _ACTAS , s _ACTBS of the adjusting devices on the drive side AS and the operating side BS and the expansion of the frame g _ACT (F _WACT ) is deducted. The elongation of the stand is a function of the rolling force and is determined by inserting the rolling force into a stand model.

$$H_{ACT}=\left({\text{s}}_0{}_{\text{AS}}+{\text{s}}_0{}_{\text{B.S}}\right)/2-\left({\text{s}}_{\text{ACTAS}}+{\text{s}}_{\text{ACTBS}}\right)/2-{\text{G}}_{\text{ACT}}\left({\text{F}}_{\text{WACT}}\right)$$

• h _ACT Actual thickness of the rolled stock
• s _ACTAS , s _ACTBS Actual position of the adjusting device on the drive and operating sides
• s _oAS , s _oBS (calibration) position of the adjusting device when calibrating with a calibration rolling force on the drive and operating side,
• F _WACT Actual rolling force
• g _ACT Actual framework strain

The actual strip thickness control 10 then provides that the said target thickness h _REF is continuously compared with the actual thickness h _ACT of the rolling stock, calculated in this way, in order to use the difference between the target thickness and the actual thickness of the rolling stock as a control deviation for the Calculate the thickness of the rolled stock. On the basis of this control deviation, the strip thickness control device 10 then determines suitable position control signals s _REFAS , s _REFBS for the adjusting devices 4 of the roller stands 3 on the drive and operating sides.

In order to precisely ensure the setting of the suitable positions specified by the strip thickness control device 10 for the adjusting device 4, it is advantageous to monitor and ensure the setting of these positions using a position control device.

Finally shows 4 a second embodiment of the in 3 strip thickness control shown. The only difference from that in 3 The strip thickness control shown is that in at least one of the roll stand stands, preferably both in the drive-side roll stand stand and in the operating-side roll stand stand, an additional stand force measuring device 5 is provided, for example below the chock 13 of the lower support roll 2. Which already according to 3 The required evaluation device 8 is then further designed to calculate the actual rolling force F _WACT more precisely, preferably on the drive and operating sides, taking into account the stand forces F _StatorAS , F _StatorBS measured by the force measuring devices 5. This can be done, for example, by averaging the stand forces calculated from the measured post forces with the directly measured stand forces F _StandAS , F _StandBS on the drive and operating sides for further calculation of the rolling force. The desired thickness control for the rolling stock at the exit of the rolling stand is thereby further refined or made more precise.

The method for operating the rolling stand 10 has the following steps: applying a rolling force via the chocks to the work rolls of the rolling stand for rolling the rolling stock, generating a measurement signal, and evaluating the measurement signal with regard to the actual rolling force _FWACT exerted on the work rolls. For this purpose, at least one hole 7 is made in at least one stand post of the at least one roll stand stand 3 and a deformation of the hole 7 is detected when the rolling force is exerted using the measuring sensor. The measurement signal represents the detected deformation of the bore 7.

The measuring sensor 6 can be a piezoelectronic sensor or a strain gauge, which is preferably inserted into the bore with a preload. The deformation of the bore 7 is then recorded in the form of a change in the preload with which the measuring sensor is inserted into the bore. The change in the preload is detected in the form of a change in the force or tension acting on the sensor in the bore 7 or in the form of a change in a compression path by which the sensor 6 in the bore 7 compared to its relaxed state or compared to compression at an operating point of the sensor is compressed.

Alternatively, the measuring sensor 6 can be designed as a laser-based displacement sensor and can be inserted into the bore 7 without preload. The deformation of the hole is then recorded in the form of measured path/time differences of light signals that are emitted by the laser-based displacement sensor in the hole.

Alternatively, the measuring sensor 6 can be designed as an inductive displacement sensor and can be inserted into the bore (7) without preload. The deformation of the bore is then recorded in the form of electrical voltages induced in the inductive displacement sensor caused by the deformation.

The actual thickness h _ACT of the rolling stock is controlled to a predetermined target thickness h _REF by issuing a suitably varied position control signal to the adjusting devices, in particular the adjusting cylinders. The actual thickness h _ACT of the rolling stock is calculated from the actual rolling force F _WACT determined by the evaluation device 8.

The positions of the adjusting devices, in particular the position of the adjusting cylinders, are preferably regulated to the target position represented by the position control signal S _REF .

Finally, the strip thickness control can be carried out separately for the roll stand stand 3 on the operating side and for the roll stand stand 3 on the drive side. It is then recommended that the two strip thickness controls 9 be synchronized to the same target thickness for the rolling stock.

Reference symbol list

1

work rolls

2

Support rollers

3

Roll stand stand

3a, 3b

Stand post

4

Hiring device

5

Force measuring device

6

measuring transmitter

7

drilling

8th

Evaluation device

9

Conversion facility

10

Strip thickness control device

12

Position control device

13

Fittings

20

Roll stand

AS

Drive side of the rolling stand stand

B.S

Operating side of the rolling stand stand

E

Inlet side

A

Outlet page

hREF

Target thickness

hACT

Actual thickness

FWACT

Actual rolling force

sACTAS, sACTBS

Actual position of the adjusting device, in particular of its adjusting cylinders on the drive or operating side

sREFAS, sREFBS

Target position of the adjusting device, in particular of its adjusting cylinders on the drive or operating side

FPf

Post force

FPfAS

Post force on the drive side

FPfBS

Post force on the operating side

FStandAS

directly measured stand forces on the drive and/or

FStandBS

Operating page

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2007147766 A1 [0002]
• CN 101695717 A [0003]

Claims (22)

Roll stand (20) for rolling a rolled stock, comprising: a roll stand stand (3) on the drive side (AS); and a roll stand stand (3) on the operating side (BS), the journals of work rolls (1) being rotatably mounted in chocks (13) in the two roll stand stands; Adjusting devices (4) in the two roll stand stands (3) for applying rolling forces via the chocks (13) to the work rolls of the roll stand (10); at least one measuring sensor (6), which is assigned to one of the two roll stand stands (3) for generating a measurement signal; and an evaluation device (8) for evaluating the measurement signal with regard to the rolling forces exerted on the work roll by the adjusting devices (4); characterized in that at least one bore (7) is made in at least one stand post (3a, 3b) of at least one of the roll stand stands (3); that the measuring sensor (6) is inserted into the bore (7) and is designed to detect the deformation of the bore (7) when the rolling force is exerted and to generate the measurement signal in such a way that it represents the detected deformation of the bore (7). Roll stand (20) after Claim 1 , characterized in that the measuring sensor (6) is inserted into the bore (7) under a preload; that the measuring sensor (6) is designed to detect the deformation of the bore (7) in the form of a change in its preload; and that the measuring sensor (6) is designed to detect the change in its preload in the form of a change in the force or mechanical tension acting on it in the bore (7) or in the form of a change in a compression path by which the measuring sensor (6) in the bore (7) is compressed compared to its relaxed state. Roll stand (20) after Claim 2 , characterized in that the measuring sensor (6) is designed in the form of a piezoelectric sensor or in the form of a strain gauge. Roll stand (20) after Claim 1 , characterized in that the measuring sensor (6) is inserted into the bore (7) without preload; and that the measuring sensor (6) is designed in the form of an inductive or laser-based displacement sensor for detecting the deformation of the bore. Roll stand (20) according to one of the preceding claims, characterized in that at least one bore (7) is made in each of the four stand posts (3a, 3b) of the two roll stand stands (3); and that at least one sensor (6) is inserted into the bores (7) in each of the roll stand stands (3). Roll stand (20) according to one of the preceding claims, characterized in that a plurality of measuring sensors (6) are inserted into the at least one bore (7) in the at least one stand post (3a, 3b). Roll stand (20) according to one of the preceding claims, characterized ; that the holes (7) and the measuring sensors (6) in the stand posts (3a, 3b) of the two roll stand stands (3) on the operating and / or drive side (BS, AS) of the roll stand and on the inlet and / or The outlet side (E, A) of one of the roll stand stands (3) is attached. Roll stand (20) after Claim 7 , characterized in that the bores (7) for the measuring sensors (6) are each made at the same height, preferably at the height of the roller gap created by the work rolls (1) in the stand posts (3a, 3b). Roll stand (20) according to one of the preceding claims, characterized in that the bores (7) for the measuring sensors (6) are each in a plane perpendicular to the preferably vertical direction The rolling forces applied by the adjusting devices (4) are introduced into the roll stand stands (3), preferably in the rolling direction or transversely to the rolling direction and/or at any acute angle to the rolling direction. Roll stand (20) according to one of the Claims 7 until 9 , characterized in that at least one strip thickness control device (10) is provided for regulating the actual thickness of the rolled stock to a predetermined target thickness (h _REF ) by outputting a suitably varied position control signal (S _REF ) to the adjusting devices (4), preferably on the drive and operating sides, especially on their adjusting cylinders; and that a conversion device (9) is provided for calculating the actual thickness (h _ACT ) of the rolling stock from the actual rolling force (F _WACT ) determined by the evaluation device (8). Roll stand (20) after Claim 10 , characterized in that an additional stand force measuring device (5) is provided for directly measuring the stand force in the rolling stand (20), preferably on the drive and on the operating side; and that the evaluation device (8) is designed to calculate the actual rolling force on the rolling stock, also taking into account the additionally measured stand forces. Roll stand (20) after Claim 10 or 11 , characterized by a position control device (12) for controlling the position of the adjusting device (4), in particular the position of the adjusting cylinders, to the desired position represented by the position control signal emitted by the strip thickness control device (9), preferably on the drive and on the Operating page. Roll stand (20) according to one of the Claims 10 until 12 , characterized in that there is a strip thickness control device (9) for the roll stand stand (3) on the operating side (BS) and a further strip thickness control device for the roll stand stand (3) on the drive side (AS); and that the two strip thickness control devices (9) are synchronized to the same target thickness for the rolling stock. Method for operating the rolling stand (10) according to one of the preceding claims, comprising the following steps: applying a rolling force via the chocks (13) to the work rolls (1) of the rolling stand (20) for rolling the rolled stock; Generating a measurement signal; and evaluating the measurement signal with regard to the actual rolling force (F _WACT ) exerted on the work rolls; characterized in that at least one hole (7) is made in the stand posts (3a, 3b) of the roll stand stands (3); that a deformation of the bore (7) is detected when the rolling force is applied; and that the measurement signal represents the detected deformation of the bore (7). Procedure according to Claim 14 , characterized in that the measuring sensor (6) is a piezoelectronic sensor or a strain gauge, which is preferably inserted into the bore with a preload; that the deformation of the bore (7) is detected in the form of a change in the preload with which the measuring sensor (6) is inserted into the bore; and that the change in the preload is detected in the form of a change in the force or tension acting on the sensor in the bore (7) or in the form of a change in a compression path by which the sensor (6) in the bore (7) is relaxed compared to its relaxed position State or opposite in a working point of the measuring sensor (6) for the force, the tension or the compression path is compressed. Procedure according to Claim 14 , characterized in that the measuring sensor (6) is designed as a laser-based displacement sensor and is inserted into the bore (7) without preload; and that the deformation of the bore is recorded in the form of measured path/time differences of light signals that are emitted by the laser-based displacement sensor in the bore. Procedure according to Claim 14 , characterized in that the measuring sensor (6) is designed as an inductive displacement sensor and is inserted into the bore (7) without preload; and that the deformation of the bore is detected in the form of electrical voltages induced in the inductive displacement sensor caused by the deformation. Procedure according to one of the Claims 14 until 17 , characterized by regulating the actual thickness (h _ACT ) of the rolling stock to a predetermined target thickness (h _REF ) by issuing a suitably varied position control signal (S _REF ) to the adjusting devices, in particular the adjusting cylinders; and calculating the actual thickness (h _ACT ) of the rolled stock from the actual rolling force (F _WACT ) determined by the evaluation device (8). Procedure according to one of the Claims 14 until 18 , characterized in that the actual rolling force (F _WACT ) from the sensors (6) in the stand posts (3a, 3b) of the two roll stand stands (3) on the operating and / or drive side (BS, AS) of the Roll stand and on the inlet and / or outlet side (E, A) of one of the roll stand stands (3) determined post forces (F _Pf ) is determined by, if 4 post forces are measured, these are added up to the actual rolling force, or if Only 2 post forces are measured, these are added up and the sum is multiplied by 2. Procedure according to Claim 18 or 19 , characterized in that the stand force in the roll stand stand is additionally measured directly; and that the actual rolling force (F _WACT ) and the actual thickness (h _ACT ) of the rolling stock are also calculated taking into account the additionally measured stator force. Process according to roll stand (10). Claim 18 , 19 or 20 , characterized by regulating the position of the adjusting devices (4), in particular the position of the adjusting cylinders, to the target position represented by the position control signal (S _REF ). Procedure according to one of the Claims 18 until 21 , characterized in that the strip thickness control for the roll stand stand (3) takes place on the operating side and for the roll stand stand (3) on the drive side; and that the two strip thickness controls (9) are synchronized to the same target thickness for the rolling stock.

Images