EP4100178B1 - Method for automatically calibrating vertical rollers of a vertical roller frame and calibration arrangement for carrying out said method - Google Patents

Description

The invention relates to a method for the automatic calibration of vertical rolls or vertical rolls (hereinafter referred to only as vertical rolls) of a vertical rolling stand for rolling flat metal products, in particular for rolling steel and non-ferrous metals.

Calibration of a vertical rolling stand is necessary to determine and, if necessary, correct the position of the vertical rolls with respect to the center of the rolling train so that the outer edges of the vertical rolls facing the center of the rolling train are the same distance from the centerline of the rolling train. Calibration can, for example, always be necessary when the vertical rolling stand is put back into operation after a repair, when the rolling train is started up again after a standstill or after a loss of signal from the control system or when the rolling result suggests a correction of the position of the vertical rolls.

Various methods for calibrating vertical rolling stands are known in the prior art. In the methods known in the prior art, the vertical rolls are calibrated in vertical rolling stands using measuring aids, such as tape measures, laser rangefinders or other measuring devices, which are used by the operating personnel on the machine or are attached to it for calibration. As a rule, a distance is measured from a fixed point on the machine to the respective vertical roller or to a point assigned to it, or the distance between both vertical rollers or points assigned to them is measured in order to achieve this Determine the position of the vertical rollers and correct them if necessary. This procedure has the particular disadvantage that people have to be in the machine area and therefore in the danger area during the calibration process.

Another disadvantage of the known methods for calibration in vertical rolling stands is that the known methods cannot be automated and are relatively time-consuming, which significantly reduces system availability.

The problem of the necessary measurements in the machine area is addressed in the CN 102688904 A described, in which a calibration method is proposed, which is carried out using a wire wrapped around hub-shaped heads of the vertical rollers.

From the CN 102989792 A a generic method for calibrating the vertical roll gap of a vertical roll stand is known. The method includes determining and marking the centerline of the rolling train for the upper and lower ends of the vertical rolls, respectively, determining the distance of the axes of the vertical rolls to the marked centerline, and vertically aligning the ends of the vertical rolls to the marked centerline. The distance from the lower ends of the vertical rollers to the lower end of the marked center line is then compared with the distance from the upper ends of the vertical rollers to the upper end of the marked center line. This is used to adjust the vertical alignment and centering of the vertical rolls in order to then carry out calibration by measuring the width of the roll gap. How exactly the distances are measured is not described in this publication.

In the JP 2012218060 A a method is described in which the position of the vertical rolls in a vertical rolling stand is determined exclusively by means of sensors or position sensors which are arranged on the adjusting cylinders and on the reset cylinders of the vertical roll units.

Further state of the art is from the WO 210/109637 A1 known.

The present invention is based on the problem of providing a method and an arrangement for carrying out the method, with which the calibration of vertical rolling stands can be automated as far as possible without personnel having to be in the stand area.

The task is solved with the features of claims 1 and 13. Advantageous embodiments of the invention result from the subclaims.

The method steps according to claim 1 are preferably carried out in the order in which they are listed.

According to one aspect of the invention, a method for the automatic calibration of vertical rolls of a vertical rolling stand is proposed, wherein the vertical rolls are each mounted in a vertical roll unit which, in relation to a predetermined center line, of several components of the rolling train arranged in a rolling train, for example rolling stands, side guides, Roller tables etc. can be adjusted, in which the vertical roller units are first moved or adjusted transversely to the center line of the rolling train against at least one stationary stop of the vertical rolling stand, which has a certain known position with respect to the center line. This position of the vertical roller units is referred to below as the calibration position. The stop can, for example, be designed as a reference surface that was measured and aligned with respect to the center line when the vertical rolling stand was set up in the rolling train. Based on the position of the vertical roller units determined in this way, a calibrated initial distance is calculated between an outer edge of a vertical roller directed towards a rolling stock and the center line in the calibration position. The vertical roller units are then moved from the calibration position to an operating position. The adjustment path to be covered is specified or calculated for each vertical roller or for each vertical roller unit, taking into account the calibrated initial distance.

This process can be carried out completely automatically and does not require any manual measuring operations in the danger zone of the vertical rolling stand. The method according to the invention provides, on the one hand, to provide reference surfaces on the movable vertical roll units or on adjacent or connected components on a vertical rolling stand and, on the other hand, to provide measuring surfaces or reference surfaces on stationary components of the vertical rolling stand. The position of these reference surfaces relative to the position of the outer edges of the rolling stock or the outer edges of the vertical rolls facing the rolling stock can be determined relatively easily, as can the position of the reference surfaces relative to one another and to the center line of the rolling train. In order to determine a defined starting position for further adjustment movements, the reference surfaces on the movable assemblies of the vertical rolling stand can be moved against reference surfaces of the stationary assemblies so that they touch each other and a further change in position is no longer possible.

In an expedient variant of the method, it is provided that a calibration process is carried out for a first vertical roller unit and for an associated second vertical roller unit, with the first and second vertical roller units being moved into the operating position in relation to the center line after the calibration process be moved so that the outer edges of the first and second vertical rollers facing the rolling stock are at the same distance from the center line.

In the context of the present application, a distinction is made between an operating position and a calibration position of the vertical roller units. The operating position in the sense of the present application is to be understood as the position of the vertical roller units, which they assume as the target position when the vertical rolling stand is in operation. As already mentioned above, the calibration position in the context of the present invention is to be understood as meaning that position of the vertical roller units in which at least one reference surface on a movable part of the vertical rolling stand rests against a reference surface of a stationary or stationary part of the vertical rolling stand when the vertical rolling stand is not in rolling operation.

The calibration process is preferably carried out for each vertical roller separately and independently of the calibration process for the other vertical roller.

In an advantageous variant of the method according to the invention, it is provided that the calculation of the calibrated initial distance is based on a given diameter of the vertical rollers. This given diameter can have been calculated starting from a target diameter, taking into account a wear-related change during the rolling process, and used as the basis for calculating the calibrated initial distance.

Each reference surface on a movable component of the vertical rolling stand is assigned a reference surface on a stationary component of the vertical rolling stand. The stationary components of the vertical rolling stand are, for example, crossheads, stand spars and upper and lower roll beams.

The position of the reference surfaces on movable components of the vertical rolling stand are determined and known with regard to the distance of the outer edge of the vertical roll directed towards the rolling stock. The position of the reference surfaces on stationary components of the vertical rolling stand are known and determined with regard to the distance to the center line of the rolling mill.

$${\mathrm{A}}_{\mathrm{ka}}\mathrm{l}={\mathrm{A}}_{\mathrm{stat}}+{\mathrm{A}}_{\mathrm{bew}}-{\mathrm{D}}_{\mathrm{W}}/2$$

wobei

• A_kal den kalibrierten Anfangsabstand der zum Walzgut gerichteten Au-ßenkante der Vertikalrolle zur Mittellinie der Walzstraße bezeichnet,
• A_stat den Abstand der stationären Bezugsfläche von der Mittellinie der Walzstraße bezeichnet,
• A_bew den Abstand der beweglichen Bezugsfläche von der Mittellinie der Vertikalrolle bezeichnet und
• Dwden Durchmesser der Vertikalrolle bezeichnet.

In the event that both the stationary reference surface and the movable reference surface are located on the side of the vertical roll facing the rolling stock, the actual distance to be calibrated from the center line of the rolling train to the outer edge of a vertical roll facing the rolling stock can be calculated using the following formula become: $${\mathrm{A}}_{\mathrm{cal}}=\mathrm{f}\left({\mathrm{A}}_{\mathrm{stat},}{\mathrm{A}}_{\mathrm{bev},}{\mathrm{D}}_{\mathrm{W}}\right)$$

$${\mathrm{A}}_{\mathrm{ka}}\mathrm{l}={\mathrm{A}}_{\mathrm{stat}}+{\mathrm{A}}_{\mathrm{bev}}-{\mathrm{D}}_{\mathrm{W}}/2$$

where

• A _kal denotes the calibrated initial distance of the outer edge of the vertical roll facing the rolling stock to the center line of the rolling train,
• A _stat denotes the distance of the stationary reference surface from the center line of the rolling train,
• A _bew denotes the distance of the movable reference surface from the center line of the vertical roller and
• Dw denotes the diameter of the vertical roller.

The calibrated total opening of the vertical rolling stand results from the sum of the individual calibration results for a first side, for example for a drive side, and for a second side, for example for an operating side of the vertical rolling stand.

The above calculation assumes that the calibration position is on the side of the vertical rolls facing the rolling stock. Just as functionally and technically possible within the scope of the invention is a calibration position, which is located in the outer regions of the vertical rolling stand. In this case, the reference surfaces would be located on the outer regions of the vertical rolling stand. Then the reference surfaces would touch each other, which can be provided, for example, stationary on the crossheads on the one hand and movable on the traverses on the other.

The adjustment of the vertical roller unit into the calibration position and/or the adjustment of the vertical roller unit into the defined operating position is expediently carried out by means of at least one adjustment system and/or by means of at least one return system.

The adjusting system can include at least one translationally moving element, for example an adjusting cylinder or an adjusting screw. Likewise, the return system can comprise at least one translationally moving element in the form of a screw drive or a return cylinder.

Although the adjustment system and/or the return system can in principle be designed as mechanical systems, these are preferably designed as hydraulic systems that include corresponding piston-cylinder arrangements.

The vertical roller unit is set into a defined operating position expediently by means of the at least one adjustment system and/or by means of the at least one return system.

The calibration process is preferably monitored via at least one measuring element, for example via a position sensor, in order to be able to carry out a target/actual comparison of the actual position and desired position of the vertical rollers. For this purpose, at least one position sensor can be provided in and/or on the adjustment system.

For example, reaching the defined operating position of the vertical roller unit can be monitored by means of at least one measuring element using at least one position sensor, preferably on at least one hydraulic piston-cylinder arrangement of the at least one hydraulic adjustment system and/or the at least one hydraulic return system.

A preferred variant of the method is characterized in that method step a) comprises initially at least a first reference surface of a defined position on a vertical roller unit or on a component adjacent to the vertical roller unit and movable with the vertical roller unit with at least a second in relation to the center line stationary reference surface defined position on the vertical rolling stand, preferably using an adjusting force, is brought into contact. Such a movable component can be, for example, a traverse or a chock of the vertical rolling stand.

The vertical roller unit can be adjusted according to method step a) over a first distance at an increased speed and over a second distance at a reduced speed until the first and second reference surfaces touch each other.

Thereafter, an increase in the contact force is preferably provided when the assigned measuring surfaces come into contact with one another, followed by a reset of the vertical roller unit with assigned movable components up to a defined unloaded position. The increase in the contact force as well as the duration of the effect are each limited.

The adjusting force of the mutually touching reference surfaces can be monitored and limited to a predetermined maximum value by means of at least one pressure transmitter on at least one piston-cylinder arrangement of the hydraulic adjusting system and/or the hydraulic return system. The pressure transmitter acts like a limit switch. If a mechanical adjustment system is provided, at least one pressure transmitter in the form of a pressure cell can be provided to monitor and limit the adjustment force.

If the reference surfaces on the movable and stationary components of the vertical rolling stand are arranged relative to one another in such a way that they have reached a position in which the reference surfaces touch each other in such a way that a further change in position is impossible, the actual position of an outer edge of the vertical roll directed towards the rolling stock be compared with a target position.

The calibration procedure can be carried out when the rolling stock has left the vertical stand, e.g. during a break in rolling, in repair shop or during maintenance. If the vertical roller units are adjusted into a calibration position transversely to the center line of the rolling mill against stops of the vertical rolling stand, which are provided on the crossheads of the rolling stand, the calibration process can also be carried out when the rolling stock is located within the rolling stand.

A further aspect of the invention relates to a vertical rolling stand for a rolling train for rolling metal products, preferably for carrying out the method described above, with a calibration arrangement, with at least two vertical rollers, each mounted in vertical roller units, which define a roll gap and which preferably have at least one hydraulic Adjustment system and / or at least one preferably hydraulic return system can be adjusted with respect to a predetermined center line of several components of the rolling train arranged in the rolling train, the calibration arrangement comprising at least a first reference surface of a defined position on at least one vertical roller unit or on adjacent or connected components, which is movable with the vertical roller unit and comprises at least a second reference surface that is stationary with respect to the center line and a control with which at least one position sensor of the adjustment system and / or the return system adjusts the vertical roller units transversely to the center line against the second reference surface as a stationary stop of the vertical rolling stand for determining a calibrated starting position and for calculating a calibrated initial distance between an outer edge of a vertical roll directed towards a rolling stock and the center line and bringing the vertical roll units into a defined rolling position.

The vertical rolling stand in which the method according to the invention is provided and on which the calibration arrangement according to the invention is provided does not necessarily have to include a return system.

A return system is only required if the adjustment system is not firmly connected to the traverse or the chocks. A movement of the adjustment system transverse to the center line then also causes a movement of the chocks. However, movement in the direction of the crossheads does not cause a corresponding movement of the chocks. In such a case, a return system is provided which allows the chocks to follow the movement of the adjustment system. In the vertical rolling stand, the adjustment system can be firmly connected to the crossbeam or the chocks. In such a case, a separate retrieval system is not required. The adjustment system then also takes over the function of the return system.

In an expedient embodiment of the calibration arrangement according to the invention, it is provided that at least one first reference surface is arranged at least on an upper and/or a lower chock of the vertical rollers and that preferably at least on an upper and/or a lower one Roll beam of the vertical rolling stand at least a second stationary reference surface is provided.

Another expedient embodiment of the calibration arrangement provides that at least a first reference surface is arranged on a component adjacent to or connected to the vertical roller unit, for example the cross member, and that at least a second reference surface is provided on the respective corresponding crosshead of the vertical rolling stand.

Preferably, at least one of the first and/or second reference surfaces is adjustable in terms of its position.

The at least one first reference surface and/or the at least one second reference surface are expediently designed as adjustable or adjustable and/or exchangeable measuring plates.

Furthermore, the calibration arrangement according to the invention preferably comprises at least one position sensor for monitoring the position of the vertical roller units.

In addition, at least one pressure transmitter can be provided, via which a contact force of the at least one first reference surface against the at least one second reference surface can be limited.

The invention is explained below using an exemplary embodiment shown in the drawings.

Figur 1

eine schematische Ansicht eines Vertikalwalzgerüsts mit einer Kalibrieranordnung gemäß der Erfindung, teilweise im Schnitt und in Durchlaufrichtung des Walzgutes betrachtet und

Figur 2

eine Draufsicht auf das in Figur 1 dargestellte Vertikalwalzgerüst, teilweise im Schnitt.

Show it:

Figure 1

a schematic view of a vertical rolling stand with a calibration arrangement according to the invention, viewed partially in section and in the direction of travel of the rolling stock and

Figure 2

a top view of the in Figure 1 Vertical rolling stand shown, partly in section.

The vertical rolling stand 1 with the calibration arrangement according to the invention comprises two vertical roller units 3 which are adjustably arranged in a stationary roll stand. The roll stand is aligned with respect to a center line 2 of several components of a rolling train arranged in a rolling train, for example rolling stands, side guides, roller tables, etc. The drawing shows the crossheads 4, the stand beams 5 and the upper and lower rolling beams 6A and 6B of the vertical rolling stand 1. The vertical roller units 3 each include a vertical roller 7, which is mounted in an upper chock 8A and a lower chock 8B. The chocks 8A, 8B are each connected to one another via traverses 9 and are adjustable with the traverses 9 relative to one another and with respect to the center line 2. The vertical roller units 3 are adjusted via an adjustment system and a return system. The adjusting system includes on each side of the vertical rolling stand 1 (operating side and drive side) an upper and a lower adjusting cylinder 10A, 10B, which act on the upper and lower chocks 8A, 8B, respectively.

The retrieval system includes a retrieval cylinder 11 on each side, which is operatively connected to the traverse 9. The traverses 9 can be moved together with the chocks 8A, 8B.

Figure 1 shows the vertical rolling stand 1 not in rolling operation, namely with a position of the vertical roll units 3 in which they are in the calibration position, in which the vertical roll units 3 move in the direction of the center line 2 of the rolling train against a stationary stop of the vertical rolling stand 1 are. The stationary stop is formed by stationary reference surfaces which have a specific and known position with respect to the center line 2, against which in Figure 1 Position shown movable reference surfaces rest on the vertical roller units 3. In the exemplary embodiment described, the stop is formed by stationary measuring plates 12A and 12B, which are provided on both sides of the upper rolling beam 6A and the lower rolling beam 6B are. For the calibration arrangement to function, it is sufficient to provide only stationary measuring plates 12 on the upper rolling beam 6A or on the lower rolling beam 6B.

On the upper chocks 8A and on the lower chocks 8B of the vertical roller units 3, upper and lower movable measuring plates 14 A, 14 B are provided as movable reference surfaces on the side of the chocks 8A, 8B facing the center line 2. These movable measuring plates are attached to the respective chocks 8A, 8B, if necessary adjustable, and are movable together with the chocks 8A, 8B. The stationary measuring plates 12A, 12B have a certain, known position with respect to the center line 2, the movable measuring plates 14A, 14B have a known, certain position with respect to the outer edges 13 of the vertical rollers 6 facing the rolling stock.

As already mentioned at the beginning, the outer edges 13 of the vertical rollers 7 directed towards the center line 2 should be in operation when the vertical rolling stand 1 is in operation, i.e. H. in the operating position of the vertical roller units 3 have the same distance from the center line 2 of the rolling mill. For this purpose, the vertical rolling stand 1 needs to be calibrated.

According to the invention, an automatic calibration is provided, including the adjustment system and the return system of the vertical rolling stand 1. The adjustment system and the return system or the associated adjustment cylinders 10A and 10B and return cylinder 11 are controlled via a controller S. At least one of the adjusting cylinders 10A includes a position sensor PG, via which a target/actual comparison of the actual position and the controlled position of the vertical roller 7 in question can be carried out in the control S. Furthermore, a pressure transmitter DG is provided, which can monitor the pressurization of the return cylinder 11. Each pressure transmitter DG can alternatively or additionally be provided on one or more adjusting cylinders 10A, 10B. The automatic calibration according to the invention is carried out for each side of the vertical rolling stand 1 (operating side and drive side) separately and independently of the other side. The sensors required for this are on each side of the vertical rolling stand 1 intended. In Figure 1 However, only one control, position monitoring and pressure monitoring are shown for one side. The exemplary embodiment is to be understood as meaning that such control, position monitoring and pressure monitoring are provided for each of the sides of the vertical rolling stand 1.

To determine a calibrated distance or initial distance A _cal , when the vertical rolling stand 1 is not in rolling operation, the control S first effects an adjustment of the upper and lower chocks 8A, 8B with the aid of the adjusting cylinders 10A, 10B and the return cylinder 11 in the direction of the center line 2 until the movable measuring plates 14A, 14B rest against the stationary measuring plates 12A, 12B. This adjustment movement takes place over a first distance at a relatively high speed and over a second distance at a relatively low speed while applying a predetermined contact force, the increase of which is monitored via the pressure transmitter DG. The process is ended when the pressure detected by the pressure transmitter DG exceeds a predetermined value. This detects the end position of the vertical roller unit 3 in the calibration position. In this position, the distances A _stat and A _bew are determined and known, so that the calibrated initial distance A _kal from the one facing the rolling stock or the center line results from the formula A _ka l=A _stat +A _bew -Dw/2 Outer edge 13 of the vertical rollers 6 can be calculated to the center line 2. The diameter D _w of the vertical roll is included in this calculation, which was preferably calculated based on a target diameter taking into account a wear-related change during the rolling process and stored in the control S.

Based on this calibrated initial distance, the same distance to the center line 2 specified for the operating position of the vertical roller units 3 can be set.

As already mentioned in the introduction, it is just as functionally and technically possible within the scope of the invention to alternatively or additionally provide a calibration position, which is located in the outer regions of the vertical rolling stand 1. In this case, the reference surfaces are located on the outer areas of the vertical rolling stand 1. This is only hinted at in the figures with dashed lines. The upper and lower movable measuring plates in this alternative embodiment are designated 14A' and 14B'. The upper and lower stationary measuring plates are designated 12A' and 12B' in this alternative embodiment. In the alternative embodiment, the upper and lower movable measuring plates 14A' and 14B' are provided on the sides of the traverses 9 facing away from the vertical rollers 7. The upper and lower stationary measuring plates 12A 'and 12B', on the other hand, are provided on the sides of the crossheads 4 of the vertical rolling stand 1 facing the vertical rollers 7. This means that a calibration position is the position in which the vertical rollers 7 are completely moved apart.

Reference symbol list

1

Vertical rolling stand

2

Center line of the rolling mill

3

Vertical roller unit

4

Crossheads of the vertical rolling stand

5

Stand bars

6A

upper rolling beam

6 B

lower rolling beam

7

Vertical rolling

8A

upper chocks

8B

lower fittings

9

Trusses

10A

upper adjusting cylinders

10B

lower adjusting cylinders

11

return cylinder

12A

upper stationary measuring plates

12B

lower stationary measuring plates

12A'

upper stationary measuring plates, alternative arrangement

12B'

lower stationary measuring plates, alternative arrangement

13

outer edges of the vertical rolls facing the rolling stock

14A

upper movable measuring plates

14B

lower movable measuring plates

14A'

upper movable measuring plates, alternative arrangement

14B'

lower movable measuring plates, alternative arrangement

S

steering

PG

Positioner

DG

Pressure transmitter

Akal

calibrated initial distance

Astatine

Distance of the stationary reference surface from the center line of the rolling train

Abew

Distance of the movable reference surface from the center line of the vertical roller

Dw

Diameter of the vertical roller

Claims (19)

1. Method for automatic calibration of vertical rollers (7) of a vertical roll stand (1), which are each mounted in a vertical roller unit (3) which is adjustable with respect to a predetermined centre line (2) of a plurality of components arranged in a rolling train, characterised in that the method comprises the following method steps:

   a) adjusting the vertical roller units (3) into a calibration setting transversely to the centre line (2) against at least one stationary abutment, which has a defined known position with respect to the centre line (2), of the vertical roll stand (1),

   b) calculating a calibrated initial spacing A_kal between an outer edge (13), which faces towards a rolling material or the centre line (2), of a vertical roller and the centre line (2) in the calibrating setting and

   c) adjustment of the vertical roller units (3) into a defined operating setting.
2. Method according to claim 1, characterised in that in each instance a calibrating process for a first vertical roller unit (3) and for an oppositely arranged second vertical roller unit (3) is carried out, wherein the first and the second roller units (3) are so moved with respect to the centre line (2) into the operating setting after the calibration process that the outer edges (13), which face the rolling material, of the vertical rollers (7) have the same spacing from the centre line (2).
3. Method according to one of claims 1 and 2, characterised in that the calibrating process for each vertical roller (7) is carried out separately and independently of the calibrating process for the opposite vertical roller (7).
4. Method according to any one of claims 1 to 3, characterised in that the calculation of the calibrated initial spacing A_kal is carried out in each instance on the basis of a given diameter D_w of the vertical rollers (7).
5. Method according to any one of claims 1 to 4, characterised in that the diameter Dw of the vertical rollers (7) is calculated starting from a target diameter taking into account a wear-induced change during the rolling process and is based on the calculation of the calibrated initial spacing A_kal.
6. Method according to any one of claims 1 to 5, characterised in that the adjustment of the vertical roller unit (3) according to method step a) is carried out with the help of at least one adjusting system and/or with the help of at least one restoring system.
7. Method according to any one of claims 1 to 6, characterised in that attainment of the defined operating setting is monitored by means of at least one measuring element, preferably by means of a position transmitter PG, at at least one hydraulic piston-cylinder arrangement of the at least one adjusting system and/or of the at least one restoring system.
8. Method according to any one of claims 1 to 7, characterised in that the method step a) comprises initially bringing at least one first reference surface of defined position at a vertical roller unit (3) or at a component adjoining the vertical roller unit (3) and movable with the vertical roller unit (3) into contact with at least one second reference surface, which is stationary with respect to the centre line (2), of defined position at the vertical roll stand (1), preferably with use of an adjusting force.
9. Method according to claim 8, characterised in that the adjustment of the vertical roller unit (3) according to method step a) is carried out over a first travel path at an increased speed and over a second travel path at a reduced speed until the first and second reference surfaces contact one another.
10. Method according to one of claims 8 and 9, characterised in that the adjusting force of the mutually contacting reference surfaces is monitored by means of at least one pressure transmitter (DG), preferably at at least one piston-cylinder arrangement of the hydraulic adjusting system and/or of the hydraulic restoring system, and is limited to a predetermined maximum value.
11. Method according to any one of claims 1 to 10, characterised in that the adjustment of the vertical roller unit (3) into a defined operating setting is carried out by means of at least one hydraulic adjusting system and/or by means of at least one hydraulic restoring system, wherein attainment of the defined operating setting is monitored by means of at least one measuring element, preferably by means of a position transmitter PG at at least one hydraulic piston-cylinder arrangement of the at least one hydraulic adjusting system and/or the at least one hydraulic restoring system
12. Method according to any one of claims 1 to 11, characterised in that this is performed during idling of the vertical roll stand (1).
13. Vertical roll stand (1) for a rolling train for rolling metal products, with a calibration arrangement, preferably for carrying out the method with the features of any one of claims 1 to 12, with at least two vertical rollers (7), which are respectively mounted in vertical roller units (3) and which define a rolling gap and are adjustable by at least one preferably hydraulic adjusting system and/or at least one preferably hydraulic restoring system with respect to a predetermined centre line (2) of a plurality of components arranged in the rolling train, characterised in that the calibration arrangement comprises at least one first reference surface of defined position at at least one vertical roller unit (3) or at a component movable therewith, which is movable with the vertical roller unit (3), and at least one second reference surface, which is stationary with respect to the centre line (2), as well as a control S, with which by at least one position transmitter PG of the adjusting system and/or of the restoring system an adjusting of the vertical roller units transversely to the centre line (2) against the second reference surface as stationary abutment of the vertical roll stand (1) for determination of a calibrated start position and for calculation of a calibrated initial spacing A_kal between an outer edge (13), which is oriented towards a rolling material or the centre line (2), of a vertical roller (7) and the centre line (2) and an adjustment of the vertical roller units (3) into a defined rolling position are produced.
14. Vertical roll stand according to claim 13, characterised in that at least one first reference surface is provided at least at, respectively, an upper and/or a lower chock (8A, 8B) of the vertical rollers (7) and/or at an adjoining component movable with the vertical roller unit (3).
15. Vertical roll stand according to one of claims 13 and 14, characterised in that at least one second, stationary reference surface is provided at least at an upper and/or a lower rest bar (6) of the vertical roll stand (1) and/or respectively at crossheads (4) of the vertical roll stand (1).
16. Vertical roll stand according to any one of claims 13 to 15, characterised in that at least one of the first and/or second reference surfaces is adjustable with respect to the position thereof.
17. Vertical roll stand according to any one of claims 13 to 16, characterised in that the at least one first reference surface and/or the at least one second reference surface is or are constructed as adjustable or settable and/or exchangeable measuring plates (12A, 12B; 14A, 14B).
18. Vertical roll stand according to any one of claims 13 to 17, characterised in that this comprises at least one position transmitter PG for monitoring the position of the vertical roller units (3).
19. Vertical roll stand according to any one of claims 13 to 18, characterised in that at least one pressure transmitter DG is provided, by way of which an adjusting force of the at least one first reference surface against the at least one second reference surface can be limited.

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