Rolling stand and method for operating said rolling stand - Patents.com

Abstract

The invention relates to a rolling stand 20 for rolling stock, comprising a rolling stand frame 3 at a drive side AS; and a rolling stand frame 3 at an operating side BS, in which in both rolling stand frames the roll necks of the work rolls 1 are rotatably mounted in chocks 13; a screw down device 4 in both rolling stand frames 3 for applying a rolling force via the chocks 13 to the work rolls of the rolling stand 20; at least one measuring device 6 for generating a measuring signal, assigned to one of both rolling stand frames 3; and an evaluation device 8 for evaluating the measuring signal taking into account the rolling force exerted by the screw down device 4 on the work rolls. In order to better protect the measuring device 6 from contamination and corrosion and, as a result, to achieve more accurate measurement signals and control results, the roll stand according to the invention has in at least one frame support 3a, 3b of at least one of the roll stand frames 3 at least one bore 7; and the measuring device 6 is inserted into the bore 7 and is configured for detecting a deformation of the bore 7 upon the action of the rolling force and for generating the measurement signal representative of the detected deformation of the bore 7.

Description

[Technical field]

[0001] The present invention relates to a roll stand for rolling stock and to a method for the operation of said roll stand, in particular the invention relates to the measurement of rolling forces in a roll stand. [Background technology]

[0002] For this purpose, basically various solutions are known in the prior art. Thus, US Pat. No. 5,399,633 discloses an apparatus and method for measuring the rolling force in a roll stand by means of an ultrasonic transmitter-receiver arrangement, with which the length change in the columns of the roll stand frame as a result of the applied rolling force is measured and this measured length change is then converted into the desired rolling force.

[0003] Furthermore, Patent Document 2 discloses a sensor for measuring rolling force, In this case, the sensor is mounted on the outside of the frame support of the rolling stand frame, and The change in length of this frame strut under load, i.e. under the applied rolling force, is measured by the coil strain, and The measured change in length is then converted into the rolling force sought.

[0004] This rolling force is used for a number of controls during the operation of the rolling stand and it is therefore desirable to be able to measure this rolling force accurately, even under high dynamic conditions.

[0005] In rolling operations, however, one often encounters imprecise or inaccurate rolling force measurements, the causes of which can be, for example, frictional forces between the roll stand frame and the chocks for the backup rolls in the roll stand, or the introduction of non-uniform forces in traditional force measuring devices, for example due to corroded or misshapen surfaces. These inaccurate force measurements can then lead to quality problems in the stock to be rolled or to instabilities in the rolling process, for example in the form of lateral movements of the ends of the stock.

[0006] In both of these patent documents, the measuring instruments are mounted outside the respective roll stand frame and are therefore left without protection from the harsh conditions in the ambient environment of the roll stand, such as, for example, contamination, dust, etc. This also results in the risk of a certain degree of inaccuracy of the measurement results. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2007 / 147766 A1 [Patent Document 2] Chinese Patent Application Publication No. 101695717 A Summary of the Invention [Problem to be solved by the invention]

[0008] The problem underlying the invention is to provide an optional rolling stand for rolling stock, which allows an accurate measurement of the rolling force, as well as an optional method for operating this rolling stand. [Means for solving the problem]

[0009] This problem is solved by the subject matter of claim 1 in relation to a rolling stand. Accordingly, the rolling stand according to the invention comprises: at least one frame strut of at least one of the roll stand frames has at least one bore formed therein; the meter is inserted into the bore; and - designed for detecting a deformation of the piercing hole during the application of the rolling force and for generating the measurement signal representative of the detected deformation of the piercing hole, It is characterized by: Effect of the Invention

[0010] The deformation of the perforation detected by the measuring device is in fact representative of the column forces in the respective roll stand frame, which are, however, directly proportional to the rolling forces acting on the rolls, and which are converted into the actual rolling forces by means of an evaluation device.

[0011] It is essential that each roll stand has two roll stand frames; one roll stand frame on the drive side and one roll stand frame on the operating side. Each roll stand frame typically has two frame posts, and the bores according to the invention are formed in each of the frame posts.

[0012] From this, approximately, the following can be deduced: That is, Measuring devices 6 in boreholes 7 respectively measure the frame brace forces, or simply the brace forces. 2 x Column Force = Frame Force; 2 x Frame Force = Rolling Stand Rolling Force

[0013] In the drill hole, the measuring device is advantageously protected, in particular against contamination in the ambient environment of the rolling stand and against corrosion, so that the measuring signal of this measuring device cannot be corrupted thereby. Rather, the measurement signal of the measuring device thus detected according to the invention provides a highly reliable basis for the calculation of the desired rolling force by the evaluation device.

[0014] According to a first embodiment, the measuring device is inserted under preload into the drill hole, the preload of the measuring device then having to be so great that the measuring device still bears against the drill hole even at maximum rolling force. This preload then defines a working point for the measuring device. The deformation of the drill hole can then be measured in the form of a change in the preload around the above-mentioned working point. Depending on the respective configuration of the measuring device, a change in preload compared to the operating point can be detected in the form of a change in the force acting on the measuring device in the borehole or in the form of a change in the mechanical load acting on the measuring device in the borehole. Optionally, a change in preload may be detected in the form of a change in the compression displacement by which the gauge within the bore is compressed compared to its relaxed state or compared to the compression of the gauge at the actuation point. Suitable measuring devices for installation in the borehole under preload are, for example, piezoelectric sensors or resistance wire strain gauges.

[0015] Alternatively or additionally, the other gauge may be inserted into the borehole without preloading. For this purpose, for example, an inductive displacement detector is suitable, which detects the deformation of the drill hole due to the rolling force by a change in the voltage induced in the inductive displacement detector, or A laser-based displacement detector is suitable, which is designed in such a way that the deformation of the drilled hole under the load of the rolling force can be detected, for example, by evaluation of the required time difference in the optical signal output by the laser-based displacement detector.

[0016] For comparison of the frame forces acting on the driving side and the operating side of the rolling stand, In each of the two roll stand frames, advantageously in each of the four columns of both roll stand frames, It is advantageous if at least one perforation is formed each with at least one measuring device each. Except in the case of special requirements, it is basically advantageous if the frame forces on the operating side and on the drive side are of the same magnitude in value.

[0017] The term "drive side" means the side of a rolling stand on which the drives for the rolls of this rolling stand are arranged. The operating side is located opposite the drive side in the axial direction of the rolls and is freely accessible to operating personnel, for example for roll changing.

[0018] The arrangement of multiple measuring devices in the drill hole gives the advantage that redundant measurements can be performed, which improves the accuracy of the calculated rolling force. It is possible that several measuring devices inserted into the boreholes are based on the same or different physical principles. The incorporation of measuring devices based on different physical principles is a further step towards improving the measurement accuracy.

[0019] Basically, measurement of the deformation of the drilling in the frame supports of the roll stand frame on the operating side and drive side of the roll stand and / or on the entry side and exit side of the roll stand frame is possible at the respective height of the supports of this roll stand frame. The installation of a drilling at the level of the horizontal rolling line and a measuring instrument located in this drilling, however, gives the advantage that the forces to be measured are then not influenced by the friction forces between the chocks and the frame supports. The perforations should advantageously be mounted perpendicular to the rolling line, within a range of 200 mm above and 200 mm below said rolling line.

[0020] The incorporation of measuring devices at the same height on all columns of the participating roll stand frames of a roll stand improves the comparability of the deformations measured within the individual frames, since these deformations at the same height of the frame columns should be the same or at least similar.

[0021] If the perforations for the measuring devices are respectively formed in a plane perpendicular to the rolling force exerted by the screw-down devices, i.e. in a horizontal plane in the columns of the roll stand frame, this offers the advantage that the deformations of the perforations to be detected also act at least essentially perpendicularly to the measuring devices, which is advantageously the case regardless of whether the perforations are formed in the frame columns of the roll stand frame in the rolling direction or transversely to this direction or at a corresponding acute angle to this direction. In the case of vertically acting rolling forces, the horizontal alignment of the perforations provides the advantage that deformations of these perforations do not act on the measuring device under an inclined angle, thereby advantageously making a coordinate transformation of the resulting measurement signal unnecessary.

[0022] The arrangement of the drill holes for the measuring devices in the respective rolling stand frames at the entry side E in the entry frame struts and at the exit side in the exit frame struts is This provides the advantage that the frame force of the respective roll stand frame can be calculated by simple addition of both support forces measured by the measuring device.

[0023] The strut forces detected according to the invention can be used for strip thickness control. For this purpose, the strut forces detected in the frame struts of the mill stand frame on the entry side and exit side are firstly integrated into the frame force of the mill stand frame. This is done separately for the exit side and the operating side for the mill stand frame. The frame forces on the drive side and on the operating side thus determined are added to the rolling force of the roll stand, which is then converted into the actual thickness for the rolled material at the exit side of the roll stand. The actual thickness so calculated is then adjusted within the strip thickness control to a predetermined target thickness for the rolled stock. By outputting a suitably changed position adjustment signal to the screw down device, This is likewise outputted and advantageously controlled on the drive and actuating side, in particular to the respective compression adjustment cylinder. In order to more precisely determine the result of the strip thickness control, in each of the two roll stand frames an additional frame force measuring device is provided for direct measurement of the frame force in both roll stand frames of the roll stand, for example below the chocks of the lower backup rolls of the roll stand. The evaluation device described above is then designed for calculating the rolling force also with additional consideration of the additionally measured frame force.

[0024] Additionally, a position control device can be provided for controlling the position adjustment signal output to the reduction device to a target position represented by the position adjustment signal output from the strip thickness control device.

[0025] The above-mentioned advantages of the rolling stand according to the invention are likewise of value for the solution according to the method of the inventive problem according to claim 14.

[0026] Further advantageous embodiments of the rolling stand according to the invention and the method according to the invention for operating said rolling stand are the subject of the dependent claims.

[0027] Four figures are attached to the specification. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 shows a roll stand according to the invention and the associated roll stand frame in a separate illustration for a first embodiment for the alignment of drill holes for measuring devices. [Diagram 2] 2 is a view similar to FIG. 1, but of a roll stand and an individual roll stand frame for a second embodiment for the alignment of drill holes according to the invention; [Diagram 3] FIG. 2 is a diagram of an individual rolling stand frame for a first embodiment for strip thickness control. [Figure 4] FIG. 4 is a diagram of an individual rolling stand frame according to FIG. 3 for selective strip thickness control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The invention will now be described in detail by way of example with reference to the figures mentioned above, in which like technical elements are designated with like reference numerals, in which:

[0030] 1 shows a rolling stand 20 according to the invention for rolling stock in a right-hand view of the rolling stand. The rolling stand 20 consists of a rolling stand frame 3 at the drive side AS and a rolling stand frame 3 at the operating side BS, both rolling stand frames being connected to one another via a transverse head. In both roll stand frames, the roll necks of the backup rolls 2 and the work rolls 1 are rotatably supported in chocks which can be seen in the left-hand view of Figure 1 and are designated there with the reference number 13.

[0031] A screw down device 4 is shown for the application of a frame force via chocks 13 and backup rolls 2 to the work rolls 1. The sum of the frame force of the drive side roll stand frame and the frame force of the operating side is the so-called rolling force of the roll stand.

[0032] In the right-hand view of Fig. 1 one can see the drill holes 7 according to the invention, into which a measuring device 6 is respectively inserted. The measuring devices 6 are designed for generating a measuring signal respectively, which represents the deformation of the drill holes in the frame posts 3a, 3b of the respective rolling stand frame 3 as a function of the frame force or rolling force respectively exerted by the screw-down device 4.

[0033] As can be seen from the left-hand view in FIG. 1, the screw down device 4 acts in a vertical direction. In order to enable the maximum effect of the change in length of the roll stand frame caused by the rolling force and the resulting deformation of the perforations 7 to be detected by the measuring device 6, it is advantageous if the perforations are formed in a plane perpendicular to the acting rolling force, i.e. in a horizontal plane, as in the example shown in the figure.

[0034] In the first embodiment shown in FIG. 1, the perforations 7 are arranged lying in this horizontal plane and are aligned in the direction of the longitudinal axes of the rolls 1, 2, i.e. transverse to the rolling direction (see right-hand image). in each of the two roll stand frames 3 and also in each of the frame columns 3a, 3b of one of the two roll stand frames, a measuring device 6 is arranged in a bore 7; and In general, it can be seen accordingly that in the rolling stand shown in FIG. 1 four measuring devices 6 are located for measuring the deformation of the perforations, into which they are respectively inserted.

[0035] The measuring devices 6 shown in FIG. 1 are arranged in the bores 7, which are respectively mounted at the same height and respectively at the height of the roll gap defined by the work rolls 1. This also applies to the special case shown in FIG. 1, according to which the work rolls exceptionally do not define any roll gap; and the perforations 7 and the measuring device 6 are now, however, arranged inside the roll stand frame at the height at which both work rolls 1 are in contact with each other.

[0036] The left-hand diagram shows an individual one of these roll stand frames 3; and this roll stand frame is constructed similarly for the drive side AS and for the operating side BS.

[0037] FIG. 2 differs from FIG. 1 only in that the drill holes 7 for the measuring devices 6 are now oriented extending in the rolling direction. Also in the case of the second embodiment shown in FIG. 2 for the alignment of the perforations 7, it can be noted that these lie in a horizontal plane which is arranged perpendicular to the acting rolling force, and that the measuring device 6 is arranged inside the rolling stand frame 3 at the height where both work rolls 1 come into contact.

[0038] FIG. 3 shows a predetermined target thickness (h REF The actual thickness of the rolled material, h ACT 1 shows a first embodiment for strip thickness control according to the invention for control of The strip thickness control according to the present invention is carried out by controlling the support force F Pf are intended to be measured by preferably four such measuring devices 6 according to the invention in the bores 7 belonging to them on the entry side E and exit side A of the rolling stand frame 3 on the drive side AS and on the operating side BS (the latter not shown). Next, the actual rolling force F WACT are the measured forces F Pf : That is, F PfAS , F PfBS is calculated by the evaluation device 8 as the sum of The support force F is only present in two of the four supports. Pf can be measured, these two support forces F can be used to at least approximately calculate the actual rolling force. Pf are added and the sum is multiplied by 2. Actual rolling force F WACT from, then, the actual cylinder positions s in the screw down devices 4 in both rolling stand frames 3 on the drive side AS and on the operating side BS ACTAS , s ACTBS Taking into account the above, the actual thickness h of the rolled material at the exit of the rolling stand is calculated using a conversion device 9. ACT is calculated as follows:

[0039] Current actual strip thickness h in the rolling gap ACT teeth, Calibration position s 0AS , s 0BS From the sum of The cylinder positions s of the screw down device 4 on the drive side AS and on the operating side BS, respectively ACTAS , s ACTBS and the rolling stand elongation g ATC (F WACT) is subtracted from the

[0040] h ACT =(s 0AS +s 0BS ) / 2-(s ACTAS +s ACTBS ) / 2-g ATC (F WACT ) Where: h ACT Actual thickness of rolled material s ACTAS , s ACTBS Actual position of the screw down device on the drive side and on the operating side s 0AS , s 0BS (Calibration) positions of the roll reduction device when calibrating with calibrated rolling forces on the drive side and on the operating side F WACT Actual rolling force g ATC Actual rolling stand elongation

[0041] The specific strip thickness control device 10 then calculates the difference between the target thickness of the rolled material and the actual thickness of the rolled material as the control deviation for the thickness of the rolled material. REF is the actual thickness h of the rolled material calculated by the above method. ACT It is intended that the comparisons be made consecutively. Based on this control deviation, the strip thickness control device 10 then generates appropriate position adjustment signals s for the roll reduction devices 4 of the rolling stand frame 3 on the drive side AS and on the operating side BS. REFAS , s REFBS Calculate.

[0042] In order to accurately ensure the proper positional adjustment predetermined by the strip thickness control device 10 for the reduction device 4, it is advantageous to monitor and ensure this positional adjustment by means of a position control device.

[0043] Finally, FIG. 4 shows a second embodiment of the strip thickness control shown in FIG. The only difference to the strip thickness control shown in FIG. 3 is that in at least one of the roll stand frames, preferably in the drive side as well as in the operator side roll stand frame, an additional frame force measuring device 5 is provided, for example below the chock 13 of the lower backup roll 2. The evaluation device 8, which is also required according to FIG. 3, then furthermore determines the actual rolling force F WACT , preferably on the drive side and on the operating side, measured by a force measuring device 5, StaenderAS , F StaenderBS It is designed for more accurate calculations with additional consideration of: This means that, for example, the frame forces calculated from the measured column forces are calculated based on the directly measured frame forces F StaenderAS , F StaenderBS This can be done by averaging for further calculation of the rolling force. The thickness control to be achieved for the rolled stock at the exit of the rolling stand is thereby made even finer or more precisely defined.

[0044] The method for operation of the rolling stand 20 comprises the following steps: Applying a rolling force via chocks to the work rolls of the rolling stand for rolling the material; Generation of a measurement signal, and Actual rolling force F acting on the work roll WACT Evaluation of this measurement signal, taking into account The method has the steps of: For this purpose, at least one perforation 7 is formed in at least one frame strut of at least one roll stand frame 3 and the deformation of this perforation 7 under the action of a rolling force is detected by means of a measuring device. The measuring signal represents the detected deformation of the perforation 7.

[0045] The measuring device 6 can be a piezoelectric sensor or a resistance wire strain gauge, which is advantageously inserted with a preload into the borehole 7. The deformation of the borehole 7 is then detected in the form of a change in the preload with which the measuring device 6 was inserted into the borehole 7. The change in preload is detected in the form of a change in the force or stress acting on the measuring device in the borehole 7, or in the form of a change in the compressive displacement by which the measuring device 6 in the borehole 7 is compressed compared to its relaxed state or compared to the compression at the operating point of the measuring device 6.

[0046] Alternatively, the measuring device 6 can be formed as a laser-based displacement detector and can be inserted without preload into the borehole 7. The deformation of the borehole is then detected in the form of a measured displacement difference / time difference of optical signals, which are emitted from the laser-based displacement detector in the borehole.

[0047] As a further alternative, the measuring device 6 can be configured as an inductive displacement detector and can be inserted without preload into the borehole 7. The deformation of the borehole is then detected in the form of a voltage that is induced in the inductive displacement detector, which is associated with the deformation.

[0048] Given a target thickness h REF to the actual thickness of the rolled material h ACT The control of the actual thickness h of the rolled material is carried out by outputting a position control signal to the roll-down device, in particular to the roll-down control cylinder, which is appropriately changed. ACT is the actual rolling force F detected by the evaluation device 8 WACT It is calculated from.

[0049] The position of the screw-down device 4, in particular the screw-down adjustment cylinder, is advantageously determined by a position adjustment signal s REF The target position is controlled to a target position represented by

[0050] Finally, the strip thickness control can be performed separately for the roll stand frame 3 at the operating side and for the roll stand frame 3 at the operating side. In that case, it is recommended that both strip thickness control devices 10 are synchronized to the same target thickness for the rolled stock. In addition, the present application relates to the invention described in the claims, but may also include the following as other aspects. 1. A rolling stand (20) for rolling a material, said rolling stand comprising: a rolling stand frame (3) at a drive side (AS); and a rolling stand frame (3) at an operating side (BS), in both of which the roll necks of the work rolls (1) are rotatably supported in chocks (13); a reduction device (4) in both roll stand frames (3) for application of a rolling force via the chocks (13) to the work rolls of the roll stand (20); at least one measuring device (6) for generating a measuring signal, which is assigned to one of the two roll stand frames (3); and an evaluation device (8) for evaluating the measurement signals taking into account the rolling force exerted by the screw down device (4) on the work roll; In the rolling stand, at least one frame strut (3a, 3b) of at least one of said roll stand frames (3) has at least one bore (7); and The measuring device (6) is inserted into the bore (7), and - designed for detecting a deformation of the perforation (7) during the application of the rolling force and for generating the measurement signal representative of the detected deformation of the perforation (7), A rolling stand (20). 2. The measuring device (6) is inserted into the bore (7) under preload; the measuring device (6) is configured to detect the deformation of the perforation (7) in the form of a change in the preload of the measuring device; and the measuring device (6) is designed to detect a change in the preload of said measuring device in the form of a change in the force or mechanical stress acting on said measuring device in the borehole (7) or in the form of a change in the compression displacement, the measuring device (6) in the borehole (7) is compressed by this compression displacement compared to the relaxed state of the measuring device; 2. The rolling stand (20) according to claim 1, 3. The rolling stand (20) according to claim 2, characterized in that the measuring device (6) is formed in the form of a piezoelectric sensor or in the form of a resistance wire strain gauge. 4. The measuring device (6) is inserted into the bore (7) without preload; and the measuring device (6) being formed in the form of an inductive or laser-based displacement detector for detection of the deformation of the perforation, 2. The rolling stand (20) according to claim 1, 5. at least one bore hole (7) is formed in each of the four frame struts (3a, 3b) of both roll stand frames (3); and at least one measuring device (6) is inserted into said bore (7) in each of said roll stand frames (3); 5. The rolling stand (20) according to any one of claims 1 to 4, 6. A rolling stand (20) according to any one of claims 1 to 5, characterized in that a plurality of measuring devices (6) are inserted into at least one of said bores (7) in at least one of said frame struts (3a, 3b). 7. The perforation (7) and the measuring device (6) are in the frame columns (3a, 3b) of both the roll stand frames (3) at the operating side and / or drive side (BS, AS) of the roll stand frame, and At the entry side and / or exit side (E, A) of one of the rolling stand frames (3), 7. The rolling stand (20) according to any one of claims 1 to 6, characterized in that it is fitted with 8. The drill holes (7) for the measuring devices (6) are mounted in the frame struts (3a, 3b) at the same height, advantageously at the height of the gap between the work rolls (1); 8. The rolling stand (20) according to claim 7, 9. The hole (7) for the measuring device (6) is respectively in a plane perpendicular to the advantageously vertical direction of the rolling force exerted by the reduction device (4): Advantageously in the rolling direction or transversely to this rolling direction and / or at a suitable acute angle to said rolling direction, 9. The rolling stand (20) according to any one of claims 1 to 8, characterized in that it is formed within the rolling stand frame (3). 10. A suitably altered position adjustment signal (s s ) for the screw-down device (4), preferably on the drive side and on the operating side, in particular for the screw-down adjustment cylinder of the screw-down device. REF ) output to obtain a given target thickness (h REF at least one strip thickness control device (10) for controlling the actual thickness of the rolled material to the strip thickness control device (10); and The actual rolling force (F WACT ) from the actual thickness (h ACT A conversion device (9) is provided for the calculation of 10. A rolling stand (20) according to any one of claims 7 to 9. 11. an additional frame force measuring device (5) is provided for direct measurement of the frame forces in the rolling stand (20), preferably on the drive side and on the operating side; and the evaluation device (8) is configured for calculating the actual rolling force on the rolled material also with additional consideration of the additionally measured frame force, 11. The rolling stand (20) according to claim 10, 12. Advantageously on the drive side and on the operating side, a position control device (12) is provided for controlling the position of the screw-down device (4), in particular the position of the screw-down adjustment cylinder, to a target position represented by a position adjustment signal output from a strip thickness control device (10); 12. The rolling stand (20) according to claim 10 or 11, characterized in that 13. a strip thickness control device (10) for the rolling stand frame (3) at the operating side (BS) and a further strip thickness control device for the rolling stand frame (3) at the drive side (AS); and both strip thickness control devices (10) being synchronized to the same target thickness for the rolled stock; 13. The rolling stand (20) according to any one of claims 10 to 12, 14. A method for operating a rolling stand (20) according to any one of claims 1 to 13, comprising the steps of: applying a rolling force via the chocks (13) to the work rolls (1) of the rolling stand (20) for rolling the rolled material; generating a measurement signal; and The actual rolling force acting on the work roll (F WACT evaluation of said measurement signal taking into account The method having the steps of: forming at least one bore hole (7) in the frame struts (3a, 3b) of the roll stand frame (3); a deformation of the perforation (7) upon application of the rolling force is detected; and said measurement signal being representative of said detected deformation of said perforation (7); The method comprising: 15. The measuring device (6) is a piezoelectric sensor or a resistance wire strain gauge, said measuring device being inserted into said borehole, advantageously with a preload; the deformation of the bore (7) is detected in the form of a change in preload with which the measuring device (6) is inserted into the bore; and the change in preload is detected in the form of a change in force or stress acting on the measuring device in the borehole (7) or in the form of a change in compression displacement, by this compressive displacement, the measuring device (6) in the borehole (7) is compressed in comparison with its relaxed state or with comparison with the compression at the operating point of the measuring device (6) for the force, the stress or the compressive displacement; 15. The method according to claim 14, characterized in that 16. The measuring device (6) is in the form of a laser-based displacement detector, and being inserted into said bore (7) without preload; and the deformation of the borehole is detected in the form of a measured displacement / time difference of optical signals, these optical signals being emitted from the laser-based displacement detector within the borehole; 15. The method according to claim 14, characterized in that 17. The measuring device (6) is formed as an inductive displacement detector and is inserted into the bore (7) without preload; and the deformation of the perforation is detected in the form of a voltage induced in an inductive displacement detector associated with the deformation. 15. The method according to claim 14, characterized in that 18. A suitably changed position adjustment signal (s s ) for the screw down device, in particular for the screw down adjustment cylinder. REF ) output, Given a target thickness (h REF ) to the actual thickness of the rolled material (h ACT ) control; and The actual rolling force (F WACT ) from the actual thickness (h ACT ) calculation, 18. The method according to any one of claims 14 to 17, characterized in that 19. The actual rolling force (F WACT )but, The support forces (F) detected by the measuring device (6) in the frame supports (3a, 3b) of both the rolling stand frames (3) at the operating side and / or the drive side (BS, AS) of the rolling stand and at the entry side and / or exit side (E, A) of one of the rolling stand frames (3). Pf )from, If four support forces are detected, these support forces are multiplied to the actual rolling force, or if only two support forces are detected, these support forces are multiplied and the sum is multiplied by two. 19. The method according to any one of claims 14 to 18, characterized in that the method is performed by detecting 20. The frame forces within the roll stand frame are additionally measured directly; and The actual rolling force (F WACT ) and the actual thickness (h ACT ) and, the calculation also taking into account the additionally measured frame forces; 20. The method according to claim 18 or 19, characterized in that 21. The position adjustment signal (s REF ) to a target position represented by the arrow A. 21. The method according to claim 18, 19 or 20, characterized in that 22. The strip thickness control is performed for the rolling stand frame (3) on the operating side and for the rolling stand frame (3) on the drive side; and both strip thickness control devices (10) being synchronized to the same target thickness for the rolled stock; 22. The method according to any one of claims 18 to 21, characterized in that [Explanation of symbols]

[0051] 1 Work roll 2. Backup Role 3 Rolling stand frame 3a Frame support 3b Frame support 4. Rolling device 5 Force measuring device 6 Measuring instruments 7 perforation 8 Evaluation equipment 9 Conversion device 10 Strip thickness control device 12 Position control device 13 Chock 20 Rolling Stand AS Rolling stand frame drive side BS Rolling Stand Frame Operation Side E Entry side A Running side h REF Target Thickness h ACT Actual Thickness F WACT Actual rolling force s ACTAS The actual position of the screw-down device, especially the screw-down adjustment cylinder of this device, on the drive or operating side s ACTBS The actual position of the screw-down device, especially the screw-down adjustment cylinder of this device, on the drive or operating side s REFAS The target position of the screw-down device, in particular the screw-down adjustment cylinder of this screw-down device, on the drive or operating side s REFBS The target position of the screw-down device, in particular the screw-down adjustment cylinder of this screw-down device, on the drive or operating side F Pf Support force F PfAS Support force on the driving side F PfBS Support force on the operation side F StaenderAS Frame forces measured directly on the drive side F StaenderBS Frame forces measured directly at the operator

Claims

1. A rolling stand (20) for rolling a stock, said rolling stand comprising: a rolling stand frame (3) at the drive side (AS); and a rolling stand frame (3) at the operating side (BS), in both of which the roll necks of the work rolls (1) are rotatably supported in chocks (13); a reduction device (4) in both roll stand frames (3) for application of a rolling force via the chocks (13) to the work rolls of the roll stand (20); - at least one measuring device (6) for generating a measuring signal, which is assigned to one of the two roll stand frames (3); and an evaluation device (8) for evaluating the measurement signals taking into account the rolling force exerted by the screw down device (4) on the work roll; In the rolling stand, at least one frame strut (3a, 3b) of at least one of said roll stand frames (3) is provided with at least one perforation (7); and The measuring device (6) is inserted into the bore (7), and - designed for detecting a deformation of the perforation (7) during the application of the rolling force and for generating the measurement signal representative of the detected deformation of the perforation (7), A rolling stand (20) characterized by:

2. said measuring device (6) being inserted under preload into said bore (7); the measuring device (6) is configured to detect the deformation of the perforation (7) in the form of a change in the preload of the measuring device; and the measuring device (6) is designed for detecting a change in the preload of said measuring device in the form of a change in the force or mechanical stress acting on said measuring device in the borehole (7) or in the form of a change in the compression displacement, the measuring device (6) in the borehole (7) is compressed by this compression displacement compared to the relaxed state of the measuring device; 2. The rolling stand (20) of claim 1, characterized in that

3. 3. The rolling stand (20) according to claim 2, characterized in that the measuring device (6) is formed in the form of a piezoelectric sensor or in the form of a resistance wire strain gauge.

4. said measuring device (6) being inserted into said bore (7) without preload; and the measuring device (6) being formed in the form of an inductive or laser-based displacement detector for detection of the deformation of the perforation, 2. The rolling stand (20) of claim 1, characterized in that

5. at least one perforation (7) is formed in each of the four frame struts (3a, 3b) of both roll stand frames (3); and at least one measuring device (6) is inserted into said bore (7) in each of said roll stand frames (3); 5. A rolling stand (20) according to any one of claims 1 to 4, characterized in that

6. 6. The rolling stand (20) according to claim 1, characterized in that a plurality of measuring devices (6) are inserted into at least one of the drill holes (7) in at least one of the frame struts (3a, 3b).

7. The perforation (7) and the measuring device (6) are in the frame struts (3a, 3b) of both the roll stand frames (3) at the operating and / or drive sides (BS, AS) of the roll stand frames, and At the entry side and / or exit side (E, A) of one of the rolling stand frames (3), 7. A rolling stand (20) according to claim 1, characterized in that it is fitted with

8. the drill holes (7) for the measuring devices (6) are mounted in the frame struts (3a, 3b) at the same height, preferably at the height of the roll gap defined by the work rolls (1); 8. The rolling stand (20) according to claim 7.

9. The hole (7) for the measuring device (6) respectively in a plane perpendicular to the preferably vertical direction of the rolling force exerted by the reduction device (4): Advantageously in the rolling direction or transversely to this rolling direction and / or at a suitable acute angle to said rolling direction, 9. The rolling stand (20) according to any one of the preceding claims, characterized in that it is formed in the rolling stand frame (3).

10. A suitably altered position control signal (s s ) for the screw-down device (4), preferably on the drive side and on the operating side, in particular for the screw-down control cylinder of the screw-down device. ＲＥＦ ) to obtain a predetermined target thickness (h ＲＥＦ at least one strip thickness control device (10) for controlling the actual thickness of the rolled material to the strip thickness control device (10); and The actual rolling force (F ＷＡＣＴ ) from the actual thickness (h ＡＣＴ A conversion device (9) is provided for the calculation of 10. A rolling stand (20) according to any one of claims 7 to 9, characterized in that

11. an additional frame force measuring device (5) is provided for direct measurement of the frame forces in the rolling stand (20), preferably on the drive side and on the operating side; and the evaluation device (8) is configured to calculate the actual rolling force on the rolled material also taking into account the additionally measured frame force, 11. The rolling stand (20) according to claim 10, characterized in that

12. Advantageously on the drive side and on the operating side, a position control device (12) is provided for controlling the position of the screw-down device (4), in particular the position of the screw-down adjustment cylinder, to a target position represented by a position adjustment signal output from a strip thickness control device (10); 12. Rolling stand (20) according to claim 10 or 11.

13. a strip thickness control device (10) for the rolling stand frame (3) at the operating side (BS) and a further strip thickness control device for the rolling stand frame (3) at the drive side (AS); and both strip thickness control devices (10) are synchronized to the same target thickness for the rolled stock; 13. A rolling stand (20) according to any one of claims 10 to 12, characterized in that

14. A method for operating a rolling stand (20) according to any one of claims 1 to 13, 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 material; generating a measurement signal; and The actual rolling force acting on the work roll (F ＷＡＣＴ evaluation of the measurement signal taking into account The method having the steps of: forming at least one bore hole (7) in the frame struts (3a, 3b) of the rolling stand frame (3); the deformation of the perforation (7) upon the application of the rolling force is detected; and said measurement signal being representative of said detected deformation of said perforation (7); The method comprising:

15. The measuring device (6) is a piezoelectric sensor or a resistance wire strain gauge, said measuring device being inserted into said borehole, advantageously with a preload; the deformation of the bore (7) is detected in the form of a change in preload with which the measuring device (6) is inserted into the bore; and the change in preload is detected in the form of a change in force or stress acting on the measuring device in the borehole (7) or in the form of a change in compression displacement, by this compressive displacement, the measuring device (6) in the borehole (7) is compressed in comparison with its relaxed state or with comparison with the compression at the operating point of the measuring device (6) for the force, the stress or the compressive displacement, The method according to claim 14, characterized in that

16. The measuring device (6) is made in the form of a laser-based displacement detector, and being inserted into said bore (7) without preload; and the deformation of the borehole is detected in the form of a measured displacement / time difference of optical signals, these optical signals being emitted from the laser-based displacement detector within the borehole; The method according to claim 14, characterized in that

17. said measuring device (6) being formed as an inductive displacement detector and being inserted without preload into said borehole (7); and the deformation of the perforation is detected in the form of a voltage induced in an inductive displacement detector associated with the deformation.

15. The method of claim 14.

18. The position adjustment signal (s) for the screw-down device, in particular for the screw-down adjustment cylinder, is appropriately changed. ＲＥＦ ) output, A given target thickness (h ＲＥＦ ) to the actual thickness (h ＡＣＴ ) control; and The actual rolling force (F ＷＡＣＴ ) from the actual thickness (h ＡＣＴ ) calculation, 18. The method according to any one of claims 14 to 17, characterized in that

19. The actual rolling force (F ＷＡＣＴ )but, The support forces (F) detected by the measuring device (6) in the frame supports (3a, 3b) of both the rolling stand frames (3) at the operating side and / or the drive side (BS, AS) of the rolling stand and at the entry side and / or exit side (E, A) of one of the rolling stand frames (3). Ｐｆ )from, If four support forces are detected, these are multiplied to the actual rolling force, or if only two support forces are detected, these are multiplied and the sum is multiplied by two, 19. The method according to claim 14, wherein the detection is performed.

20. the frame forces in the roll stand frame are additionally measured directly; and The actual rolling force (F ＷＡＣＴ ) and the actual thickness (h ＡＣＴ ) and, the calculation also taking into account the additionally measured frame forces; 20. The method according to claim 18 or 19, characterized in that

21. The position adjustment signal (s ＲＥＦ ) to a target position represented by the arrow A.

21. The method according to claim 18, 19 or 20, characterized in that

22. the strip thickness control is performed for the rolling stand frame (3) on the operating side and for the rolling stand frame (3) on the drive side; and both strip thickness control devices (10) are synchronized to the same target thickness for the rolled stock; 22. The method according to any one of claims 18 to 21, characterized in that

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