EP4499325B1 - Roll stand and method for operating same - Google Patents

Description

The invention relates to a rolling mill for rolling a material and a method for operating the rolling mill. In particular, the invention relates to the measurement of rolling forces in a rolling mill.

Several solutions are known in the prior art. For example, 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. This arrangement measures changes in length in a post of a rolling stand upright due to an applied rolling force, and this measured change in length is then converted into the desired rolling force.

Furthermore, the Chinese patent application reveals CN 101695717 A A sensor for measuring rolling force, wherein the sensor is mounted on the outside of a post of the rolling stand and measures the changes in length of the post under load, i.e., when rolling force is applied, by means of the deformation of a coil, and then converts the measured change in length into the desired rolling force. The preamble of claims 1 and 14 is based on this document.

The rolling force is used for a variety of controls during the operation of the rolling stand, and therefore it is desirable to be able to measure the rolling force accurately even under high dynamic conditions.

However, inaccurate or faulty rolling force measurements are common in rolling operations. This can be caused by frictional forces, for example, between the rolling stand uprights and the supports for the backup rolls in the rolling stand, or by a non-homogeneous force application to the traditional force measuring devices, such as due to corroded or deformed surfaces. These inaccurate force measurements then lead to quality problems with the rolled material. or to a destabilization of the rolling process, e.g. in the form of the ends of the rolled material running sideways.

In the two patent applications cited above, the measuring sensors are mounted on the outer sides of the rolling mill stands and are therefore exposed to the harsh conditions in the vicinity of a rolling mill, such as dirt and dust. This also results in the risk of a certain degree of inaccuracy in the measurement results.

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

This problem is solved with respect to the rolling stand by the subject matter of claim 1. Accordingly, the rolling stand according to the invention is characterized in that at least one bore is provided in at least one upright post of at least one of the rolling stand uprights; that the measuring sensor is inserted into the bore and is configured to detect a deformation of the bore when the rolling force is applied and to generate a measuring signal such that it represents the detected deformation of the bore.

The deformation of the bore, as measured by the sensors, originally represents a post force in the respective rolling stand. These post forces are directly proportional to the rolling force exerted on the rolls. The post forces are converted into the actual rolling force using an evaluation unit.

As a general rule: Every rolling mill stand has two uprights; one on the drive side and one on the operator side. Each upright typically has two upright posts. The bores according to the invention are each drilled into the upright posts. This results approximately in:
The sensor in the bores measures a stand force, or simply stand force. 2 x stand force = stand force; 2 x stand force = rolling force of the rolling stand.

The measuring sensor is advantageously protected within the bore, particularly against dirt in the vicinity of the rolling stand and against corrosion, so that its measuring signal is not distorted. Rather, the measuring signal from the sensor, determined in this way according to the invention, provides a reliable basis for the evaluation unit to calculate the required rolling force.

According to a first embodiment, the sensor is inserted into the bore under preload. The preload of the sensor must be sufficient to ensure that the sensor remains in contact with the bore even under maximum rolling force. This preload defines an operating point for the sensor. Any deformation of the bore can then be measured as a change in the preload around this operating point. Depending on the sensor's design, the change in preload relative to the operating point can be determined as a change in the force acting on it within the bore or as a change in the mechanical stress acting on it within the bore. Alternatively, the change in preload can also be determined as a change in the compression stroke by which the sensor is compressed within the bore compared to its relaxed state or its compression at the operating point. Suitable sensors for installation in the bore under preload include, for example, piezoelectric sensors or strain gauges.

Alternatively or additionally, other measuring sensors can also be inserted into the bore without preload. Suitable examples include inductive displacement sensors, which detect a rolling force-induced deformation of the bore by a change in the electrical voltage induced within it, or laser-based displacement sensors, which are designed to detect the deformation of the bore under the load of the rolling force. by evaluating, for example, differences in the travel time of light signals they emit.

To compare the forces acting on the drive side and the operator side of the rolling mill stand, it is advantageous if at least one bore with at least one measuring sensor is provided in each of the two rolling mill stand uprights, preferably in each of the four posts of the two rolling mill stand uprights. Except where special requirements apply, it is generally advantageous if the forces on the operator side and the drive side are of equal magnitude.

The term "drive side" refers to the side of a rolling mill stand where the drives for the rolls are located. The "operating side" is located opposite the drive side in the axial direction of the rolls and is freely accessible to operators, e.g., for roll changes.

Providing multiple sensors in a bore offers the advantage of enabling redundant measurements, which also increases the accuracy of the calculated rolling force. The sensors installed in the bore can be based on the same or different physical principles. Installing sensors based on different physical principles would be a further measure to increase measurement accuracy.

In principle, measuring the deformation of the bore in the upright posts of the rolling mill stands is possible on the operating and drive sides of the mill stand and/or on the entry and exit sides of one of the mill stands at any height of the upright posts. However, positioning the bores and the measuring sensor within them 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 upright posts. Drill 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 mill 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 bores for the sensors are each drilled in a plane perpendicular to the rolling forces applied by the adjusting devices, i.e., in a horizontal plane into the posts of the rolling stand uprights, this offers the advantage that the deformation of the bores to be detected also acts, at least substantially, perpendicularly on the sensors. This advantageously applies regardless of whether the bore is drilled in the rolling direction, transversely to the rolling direction, or at any acute angle to the rolling direction. With vertically acting rolling forces, the horizontal orientation of the bores offers the advantage that the deformation of the bores does not act on the sensors at an oblique angle, thus advantageously eliminating the need for a coordinate transformation of the resulting measurement signals.

Providing 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 roller 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 entry and exit sides of the upright posts of a rolling mill stand are first summed to obtain the upright force of the rolling mill stand. This is done separately for the uprights on the drive side and the operator side. The drive-side and operator-side upright forces thus determined are then added to the rolling force of the The rolling force is added up in the rolling stand. This rolling force is then converted into the actual thickness of the rolled material at the exit of the rolling stand. Within the strip thickness control system, the actual thickness thus determined is then adjusted to a predetermined target thickness for the rolled material by outputting a suitably varied position control signal to the adjusting devices on both the drive and operator sides, in particular to the respective adjusting cylinders, and preferably controlled. To refine the strip thickness control result, an additional stand force measuring device can be provided in each of the two rolling stand uprights, for example, below the mounting blocks of the lower backup roll of the rolling stand, for directly measuring the stand forces in the two rolling stand uprights. The evaluation device is then designed to calculate the rolling force also taking the additionally measured stand forces into account.

Additionally, a position control device may be provided to regulate the position control signal issued to the adjusting devices to the target position represented by the position control signal issued by the strip thickness control device.

The aforementioned advantages of the rolling mill according to the invention also apply equally to the methodological solution of the problem of the invention according to claim 14.

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

Figur 1

das erfindungsgemäße Walzgerüst und einen dazugehörigen Walzgerüstständer in Einzelansicht mit einem ersten Ausführungsbeispiel für die Ausrichtung der Bohrungen für die Messgeber;

Figur 2

das Walzgerüst und den einzelnen Walzgerüstständer analog zu Figur 1, allerdings mit einem zweiten Ausführungsbeispiel für die Ausrichtung der erfindungsgemäßen Bohrungen;

Figur 3

einen einzelnen Walzgerüstständer mit einem ersten Ausführungsbeispiel für die Banddickenregelung; und

Figur 4

den einzelnen Walzgerüstständer gemäß Figur 3 mit einer alternativen Banddickenregelung

zeigt.The description includes four figures, whereby

Figure 1

the rolling mill stand according to the invention and an associated rolling mill stand in a single view with a first Example of how to align the bores for the measuring sensors;

Figure 2

the rolling mill stand and the individual rolling mill stand analogous to Figure 1 , however, with a second embodiment for the alignment of the bores according to the invention;

Figure 3

a single rolling stand stand with a first embodiment for strip thickness control; and

Figure 4

the individual rolling mill stand according to Figure 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, identical technical elements are designated by the same reference numerals.

Figure 1 Figure 1 shows the rolling mill stand 20 according to the invention for rolling a material. The rolling mill stand 20 consists of a stand frame 3 on the drive side AS and a stand frame 3 on the operator side BS, the two stands being connected to each other by crossheads. The journals of both the backup rolls 2 and the work rolls 1 are rotatably mounted in mounting blocks in the two stand frames 3. The mounting blocks are shown in the left figure. Figure 1 to be identified and designated there with reference numeral 13.

An adjusting device 4 is shown for applying a stand force via the mounting pieces 13 and the backup rolls 2 to the work rolls 1. The sum of the stand force of the drive-side rolling stand stand and the stand force of the operator-side rolling stand stand is the so-called rolling force of the rolling stand.

In the right-hand image of Figure 1 The bores 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 measuring signal which represents a deformation of the bores in the upright posts 3a, 3b of the respective rolling stand upright 3 according to the upright forces or rolling forces applied by the adjusting devices 4.

As can be seen from the left-hand image in Figure 1 As can be seen, the adjusting device 4 acts in a vertical direction. In order to determine the maximum effect of the changes in length of the rolling stand frame 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 formed in a plane perpendicular to the acting rolling force, i.e., as in the embodiments shown in the figures, in a horizontal plane.

At the in Figure 1 In the first embodiment shown, the bores 7 are arranged lying in this horizontal plane and aligned in the direction of the longitudinal axes of the rolls 1, 2, i.e., transversely to the rolling direction; see the figure on the right. It can be seen that 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, a measuring sensor 6 is arranged in bores; thus, a total of 6 measuring sensors are located in the assembly shown. Figure 1 The rolling mill shown has four measuring sensors 6 for measuring the deformation of the bores into which they are each inserted.

The in Figure 1 The measuring sensors 6 shown are arranged in bores 7, which are each mounted at the same height, specifically at the height of the roll gap created by the work rolls 1. This also applies to the one shown in Figure 1 The special case shown, in 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 inside the rolling stand uprights at which the two work rolls 1 each touch.

The left illustration shows a single rolling stand stand 3; it is constructed analogously for the drive side AS and for the operating side BS.

Figure 2 differs from the Figure 1 This is solely due to the fact that the bores 7 for the measuring sensors 6 are aligned here in the rolling direction. This also applies to the in Figure 2 In the second embodiment shown for the alignment of the bores 7, it can be seen that these bores lie in a horizontal plane that is arranged perpendicular to the acting rolling force and that the measuring sensors 6 are arranged at the height inside the rolling stand uprights at which the two work rolls 1 touch.

Figure 3 Figure 1 shows a first embodiment of the strip thickness control according to the invention for controlling the actual thickness h _ACT of the rolled material to a predetermined target thickness, in Figure 3 The strip thickness control system according to the _invention provides that the post forces F _{_Pf} are measured by 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 roll stands 3 on the drive and operator sides AS and BS (the latter not shown). The actual rolling force F_{_WACT} is then calculated as the sum of these four measured post forces F _{_Pf} : F _{_PfAS} , F _{_PfBS} using the evaluation unit 8. If the post forces F _{_Pf} can only be measured in two of the four posts, these two post forces are added together and the sum is multiplied by 2 to calculate the actual rolling force at least approximately. From the actual rolling force F _WACT, the actual thickness H _ACT of the rolled material at the exit of the rolling stand is then calculated as follows - with the help of the conversion device 9, taking into account the actual cylinder positions S _ACTAS , S _ACTBS at the adjusting devices 4 in the two rolling stand stands 3 on the drive side AS and the operating side BS:

hACT

Ist-Dicke des Walzgutes

SACTAS, SACTBS

Ist-Position der Anstelleinrichtung auf der Antriebs- und der Bedienseite

soAS, soBS

(Kalibrier-)Position der Anstelleinrichtung beim Kalibrieren mit einer Kalibrierwalzkraft auf der Antriebs- und auf der Bedienseite,

FWACT

Ist-Walzkraft

gACT

Ist-Gerüstdehnung

The current actual strip thickness H _ACT in the roll gap is calculated by subtracting the sum of the cylinder positions S _ACTAS , S ACTBS from the sum of the calibration positions s _oAS , s _{oBS ,} respectively, from the sum of the cylinder positions S ACTAS , S _{ACTBS ,} respectively, from the adjustment devices AS on the drive side and BS on the operator side. The elongation of the stand g _ACT (F _WACT ) is subtracted. The elongation of the stand is a function of the rolling force and is determined by inserting the rolling force into a stand model. $${\mathrm{h}}_{\mathrm{ACT}}=\left({\mathrm{s}}_{\mathrm{oAS}}+{\mathrm{s}}_{\mathrm{oBS}}\right)/2-\left({\mathrm{s}}_{\mathrm{ACTAS}}+{\mathrm{s}}_{\mathrm{ACTBS}}\right)/2-{\mathrm{g}}_{\mathrm{ACT}}\left({\mathrm{F}}_{\mathrm{WACT}}\right)$$

hACT

Actual thickness of the rolled material

SACTAS, SACTBS

Actual position of the adjusting device on the drive and operator sides

soAS, soBS

(Calibration) position of the adjusting device during calibration with a calibration rolling force on the drive and operator sides,

FWACT

Actual rolling force

gACT

Current scaffold elongation

The actual strip thickness control 10 then provides that the aforementioned target thickness h _REF is continuously compared with the actual thickness H _ACT of the rolled material, calculated in the aforementioned manner, in order to calculate the difference between the target and actual thickness of the rolled material as the control deviation for the thickness of the rolled material. Based on 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 roll stands 3 on the drive and operator sides.

In order to ensure that the suitable positions specified by the strip thickness control device 10 for the adjustment device 4 are set exactly, it is advantageous to monitor and ensure the setting of these positions with the help of a position control device.

Finally, it shows Figure 4 a second embodiment of the in Figure 3 shown strip thickness control. The only difference to the one in Figure 3 The strip thickness control shown consists of the fact that in at least one of the rolling stand uprights, Preferably, an additional stand force measuring device 5 is provided, for example below the mounting piece 13 of the lower support roll 2, both in the drive-side and in the operator-side rolling stand. This device is also already provided according to Figure 3 The required evaluation unit 8 is further configured to calculate the actual rolling force F_{_WACT} more accurately, taking into account the upright forces F _{_uprightAS} , F _{_uprightBS} measured by the force measuring devices 5, preferably on the drive and operator sides. This can be achieved, for example, by averaging the upright forces calculated from the measured upright forces with the directly measured upright forces F _{_uprightAS} , F _{_uprightBS} on the drive and operator sides for the further calculation of the rolling force. This further refines and clarifies the desired thickness control for the rolled material at the exit of the rolling stand.

The method for operating the rolling stand 10 comprises the following steps: applying a rolling force via the mounting blocks to the work rolls of the rolling stand to roll the material, 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 bore 7 is drilled into at least one upright post of the at least one rolling stand upright 3, and the deformation of the bore 7 during the application of the rolling force is detected by means of the sensor. The measurement signal represents the detected deformation of the bore 7.

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

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

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

The actual thickness h _ACT of the rolled material is adjusted to a predetermined target thickness h _REF by outputting a suitably varied position control signal to the adjusting devices, in particular the adjusting cylinders. The actual thickness H _ACT of the rolled material is calculated from the actual rolling force F _WACT determined by the evaluation unit 8.

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

Finally, the strip thickness control for the rolling stand 3 on the operator side and for the rolling stand 3 on the drive side can be performed separately. It is then recommended that the two strip thickness controls 9 be synchronized to achieve the same target thickness for the rolled material.

Reference symbol list

1

work rollers

2

Support rollers

3

Rolling mill stand

3a, 3b

Post

4

Adjustment device

5

Force measuring device

6

Sensor

7

Drilling

8

Evaluation unit

9

Conversion device

10

Strip thickness control device

12

Position control device

13

Installation pieces

20

Rolling mill

AS

drive side of the rolling mill stand

BS

Operating side of the rolling mill stand

E

Inlet side

A

Outlet side

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 operator side

sREFAS, sREFBS

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

FPf

Post force

FPfAS

Post force on the drive side

FPfBS

Post force on the operator side

FStänderAS

directly measured stator forces on the drive and/or

FStänderBS

User interface

Claims (22)

1. Roll stand (20) for rolling a rolling material, comprising:

   a roll stand housing (3) on the drive side (AS); and

   a roll stand housing (3) on the operating side (BS),

   wherein the journals of work rolls (1) are rotatably mounted in chocks (13) in the two roll stand housings;

   adjusting devices (4) in the two roll stand housings (3) for applying rolling forces by way of the chocks (13) to the work rolls of the roll stand (10);

   at least one measurement transmitter (6), which is associated with one of the two roll stand housings (3) for generating a measurement signal; and

   an evaluating device (8) for evaluating the measurement signal with respect to the rolling forces exerted by the adjusting devices (4) on the work rolls;

   characterised in that

   at least one bore (7) is formed in at least one housing post (3a, 3b) of at least one of the roll stand housings (3);

   the measurement transmitter (6) is inserted into the bore (7) and configured for detection of deformation of the bore (7) during exertion of the rolling force and for generating the measurement signal in such a way that it represents the detected deformation of the bore (7).
2. Roll stand (20) according to claim 1,
   characterised in that

   the measurement transmitter (6) is inserted into the bore (7) under a bias;

   the measurement transmitter (6) is configured to detect the deformation of the bore (7) in the form of a change in its bias; and

   the measurement transmitter (6) is configured to detect the change in its bias in the form of a change in the force or mechanical stress acting in the bore (7) or in the form of a change in a compression travel by which the measurement transmitter (6) is compressed in the bore (7) by comparison with its relaxed state.
3. Roll stand (20) according to claim 2,
   characterised in that
   the measurement transmitter (6) is configured in the form of a piezoelectric sensor of in the form of a strain gauge.
4. Roll stand (20) according to claim 1,
   characterised in that

   the measurement transmitter (6) is inserted into the bore (7) without bias;
   and

   the measurement transmitter (6) is constructed in the form of an inductive or laser-based travel transmitter for detection of the deformation of the bore.
5. Roll stand (20) according to any one of the preceding claims,
   characterised in that

   at least one respective bore (7) is formed in each of the four housing posts (3a, 3b) of the two roll stand housings (3); and

   at least one respective measurement transmitter (6) is mounted in the bores (7) in each of the roll stand housings (3).
6. Roll stand (20) according to any one of the preceding claims,
   characterised in that
   a plurality of measurement transmitters (6) is inserted into the at least one bore (7) in the at least one housing post (3a, 3b).
7. Roll stand (20) according to any one of the preceding claims,
   characterised in that
   the bores (7) and the measurement transmitters (6) are mounted in the housing posts (3a, 3b) of the two roll stand housings (3) on the operating side and/or the drive side (BS, AS) of the roll stand and on the inlet side and/or outlet side (E, A) of one of the roll stand housings (3).
8. Roll stand (20) according to claim 7,
   characterised in that
   the bores (7) for the measurement transmitters (6) are respectively mounted at the same height, preferably at the height of the rolling gap, which is spanned by the work rolls (1), in the housing posts (3a, 3b).
9. Roll stand (20) according to any one of the preceding claims,
   characterised in that
   the bores (7) for the measurement transmitters (6) are each formed in a plane perpendicular to the preferably vertical direction of the rolling forces applied by the adjusting devices (4), preferably in rolling direction or transversely to rolling direction and/or in any acute angle with respect to the rolling direction, in the roll stand housings (3).
10. Roll stand (20) according to any one of claims 7 to 9,
    characterised in that

    at least one strip thickness regulating device (10) is provided for regulating the actual thickness of the rolling material to a predetermined target thickness (h_REF) by output of a suitably varied position setting signal (S_REF) to the setting devices (4), preferably on the drive side and on the operating side, particularly to adjusting cylinders thereof; and

    a recalculating device (9) is provided for calculating the actual thickness (h_ACT) of the rolling material from the actual rolling force (F_WACT); determined by the evaluating device (8).
11. Roll stand (20) according to claim 10,
    characterised in that

    an additional housing force measuring device (5) is provided for direct measurement of the housing force in the roll stand (20), preferably on the drive side and on the operating side; and

    the evaluating device (8) is configured to calculate the actual rolling force on the rolling material also with additional consideration of the additionally measured housing forces.
12. Roll stand (20) according to claim 10 or 11,
    characterised by
    a position regulating device (12) for regulating the position of the adjusting device (4), particularly the position of the adjusting cylinder with respect to the target position represented by the position setting signal output by the strip thickness regulating device (9), preferably on the drive side and the operating side.
13. Roll stand (20) according to any one of claims 10 to 12,
    characterised by

    a strip thickness regulating device (9) for the roll stand housing (3) on the operating side (BS) and a further strip thickness regulating device for the roll stand housing (3) on the drive side (AS) are given; and

    the two strip thickness regulating devices (9) are synchronised to an identical target thickness for the rolling material.
14. Method of operating a roll stand (10) according to any one of the preceding claims, comprising the following steps:

    application of a rolling force by way of the chocks (13) to the work rolls (1) of the roll stand (20) for rolling the rolling material;

    generating a measurement signal; and

    evaluating the measurement signal with respect to the actual rolling force (F_WACT); exerted on the work rolls;

    characterised in that

    at least one bore (7) is formed in the housing posts (3a, 3b) of the roll stand housings (3);

    deformation of the bore (7) during exertion of the rolling force is detected; and

    the measurement signal represents the detected deformation of the bore (7).
15. Method according to claim 14,
    characterised in that

    the measurement transmitter (6) is a piezoelectronic sensor or a strain gauge, which is preferably mounted in the bore with a bias;

    the deformation of the bore (7) is detected in the form of a change in the bias by which the measurement transmitter (6) is mounted in the bore; and

    the change in the bias is detected in the form of a change in the force or stress acting on the measurement transmitter in the bore (7) or in the form of a change in a compression travel by which the measurement transmitter (6) is compressed in the bore (7) by comparison with a relaxed state thereof or in relation to a working point of the measurement transmitter (6) for the force, the stress or the compression travel.
16. Method according to claim 14,
    characterised in that

    the measurement transmitter (6) is constructed as a laser-based travel transmitter and is mounted without bias into he bore (7); and

    the deformation of the bore is detected in the form of measured travel/time differences of light signals emitted by the laser-based travel transmitter into the bore.
17. Method according to claim 14,
    characterised in that

    the measurement transmitter (6) is constructed as an inductive travel transmitter and is mounted without bias in the bore (7); and

    the deformation of the bore is detected in the form of electrical voltages induced in the inductive travel transmitter and caused by the deformation.
18. Method according to any one of claims 14 to 17,
    characterised by

    regulating the actual thickness (h_ACT) of the rolling material to a predetermined target thickness (h_REF) by output of a suitably varied position setting signal (s_REF) to the adjusting devices, particularly the adjusting cylinders; and

    calculating the actual thickness (h_ACT) of the rolling material from the actual rolling force (F_WACT); determined by the evaluating device (8).
19. Method according to any one of claims 14 to 18,
    characterised in that
    the actual rolling force (F_WACT); is determined from the post forces (F_Pf) determined by the measurement transmitters (6) in the housing posts (3a, 3b) of the two roll stand housings (3) on the operating side and/or drive side (BS, AS) of the roll stand and on the inlet side and/or outlet side (E, A) of one of the roll stand housings (3) in that when four post forces are measured these are summated to give the actual rolling force or when merely two post forces are measured these are summated and the sum is multiplied by two.
20. Method according to claim 18 or 19,
    characterised in that

    the housing force in the roll stand housing is in addition measured directly; and

    the actual rolling force (F_WACT); and the actual thickness (h_ACT) of the rolling material are also calculated with additional consideration of the additionally measured housing force.
21. Method according to claim 18, 19 or 20,
    characterised by
    regulating the position of the adjusting devices (4), particularly the position of the adjusting cylinders with respect to the target position represented by the position setting signal (s_REF).
22. Method according to any one of claims 18 to 21,
    characterised in that

    the strip thickness regulation for the roll stand housings (3) is carried out on the operating side and for the roll stand housings (3) on the drive side; and

    the two strip thickness regulations (9) are synchronised with respect to an identical target thickness for the rolling material.