Method for automatically calibrating vertical rolls of a vertical rolling mill stand and calibration device for performing the method

Abstract

The present invention relates to a method for automatically calibrating vertical rolls (7) of a vertical rolling mill stand (1), the vertical rolls being supported in vertical roll units (3) capable of adjustment relative to a predetermined centerline (2) of a plurality of components disposed in a rolling mill unit, the method comprising the following steps: a) adjusting a stop of the vertical roll unit (3) fixed at at least one position relative to the vertical rolling mill stand (1) transversely to the centerline (2) to a calibration position, the stop having a known specific orientation relative to the centerline (2); b) calculating a calibrated initial distance A between the outer edge (13) of the vertical roll pointing toward the workpiece or toward the centerline (3) and the centerline (2) in the calibration position. kal c) Adjust the vertical roller unit (3) to a defined operating position. The invention also relates to a calibration device at a vertical mill stand (1) for performing the method.

Description

TECHNICAL FIELD

[0001] The present invention relates to a method for automatic calibration of a vertical roll of a vertical rolling mill stand for flat products of rolled metal, in particular of rolled steel and non-ferrous metals. BACKGROUND

[0002] It is necessary to calibrate a vertical rolling mill stand to determine and, if necessary, to correct the position of the vertical rolls relative to the center of the rolling mill train, so that the outer edges of the vertical rolls, which are directed toward the center of the rolling mill train, have the same spacing from the center line of the rolling mill train. Calibration is required, for example, each time the vertical rolling mill stand is put back into operation after maintenance, each time the rolling mill train is started up again after a standstill or after a loss of control device signals or each time the rolling results indicate that calibration of the position of the vertical rolls is advisable.

[0003] Various methods for calibrating a vertical rolling mill stand are known from the prior art. In the methods known from the prior art, calibration of the vertical rolls in the vertical rolling mill stand is carried out using a measuring aid, i.e. for example a tape measure, a laser distance meter or other measuring devices used by the machine's operating personnel or attached to the machine for calibration. Here, the spacing of a fixed point on the machine from the respective vertical roll or from a point associated with the vertical roll, or the spacing between two vertical rolls or points associated with the vertical rolls, is usually determined in order to determine the position of the vertical rolls and, if necessary, to correct it. The described approach has the following disadvantages, among others: personnel must remain in the machine area and thus in a hazardous area during the calibration process.

[0004] A further disadvantage of the known methods for calibration in a vertical rolling mill stand can be that the known methods cannot be automated and are relatively time-consuming, thereby significantly reducing the availability of the facility.

[0005] The problem of the measurements that can be required in the machine area is described in CN 102688904 A, in which a calibration method is proposed that is carried out by means of a thin wire that is wrapped around a sleeve-shaped head of the vertical roll.

[0006] A method for calibrating the stand roll gap of a stand rolling mill is also known from CN 102989792 A. The method comprises determining and marking the center line of the rolling mill train for the upper end and the lower end of the stand roll, respectively, determining the spacing of the axis of the stand roll from the marked center line, and vertically aligning the end of the stand roll with the marked center line. Then, the spacing of the lower end of the stand roll from the lower end of the marked center line is compared with the spacing of the upper end of the stand roll from the upper end of the marked center line. Via this, the vertical orientation and centering of the stand roll is set in order to then perform the calibration via measuring the width of the roll gap. It is not described in this reference how the spacing measurement is precisely performed.

[0007] In JP 2012218060 A, a method is described in which the position of the stand roll in the stand rolling mill is determined only by means of sensors or position sensors which are provided at the reset cylinder and at the adjustment cylinder of the stand roll unit. SUMMARY

[0008] The object on which the present invention is based is to provide a method and a device for performing the method by means of which the calibration of a stand rolling mill can be performed as automatically as possible without personnel having to stay in the mill area for this purpose.

[0009] The object is achieved by means of a method for automatically calibrating stand rolls of a stand rolling mill according to the invention and a calibration device at a stand rolling mill in a rolling mill train for rolling metal products according to the invention.

[0010] According to one aspect of the invention, a method for automatically calibrating stand rolls of a stand rolling mill is proposed, wherein the stand rolls are each supported in a stand roll unit which can be adjusted relative to a predefined center line of a plurality of components of the rolling mill train which are arranged in the rolling mill train, for example the rolling mill stand, the lateral guide device, the roll table, etc., wherein first at least one stop which is fixed in position relative to the stand rolling mill is traveled or adjusted transversely to the center line of the rolling mill train, the stop having a known specific orientation relative to the center line. This position of the stand roll unit is hereinafter referred to as the calibration position. The stop can be configured, for example, as a reference surface which has already been calibrated and aligned relative to the center line when the stand rolling mill was erected in the rolling mill train. On the basis of the thus determined position of the stand roll unit, a calibrated initial spacing between the outer edge of the stand roll which is directed toward the rolled product and the center line in the calibration position is calculated. The stand roll unit is then traveled from the calibration position into the operating position. The adjustment path which is traveled here is preset or calculated for each stand roll or each stand roll unit taking into account the calibrated initial spacing.

[0011] The process can be performed fully automatically and without any manual measurement processes in the dangerous area of the vertical rolling mill stand. The method according to the application proposes that at the vertical rolling mill stand, on the one hand, reference surfaces are provided at the movable vertical roller units or at adjoining or connected components, and on the other hand, measuring surfaces or reference surfaces are provided at the stationary components of the vertical rolling mill stand. The orientation of the reference surfaces relative to the outer edge of the rolled material or the outer edge of the vertical rollers facing the rolled material can be determined relatively easily, as can the orientation of the reference surfaces relative to one another and relative to the center line of the rolling mill train. In order to determine a defined initial position for the further adjustment movement, the reference surfaces at the movable assemblies of the vertical rolling mill stand can be advanced toward the reference surfaces of the stationary assemblies, so that they come into contact and can no longer be changed in position further.

[0012] In an advantageous variant of the method, it is proposed that the calibration process is carried out separately for the first vertical roller unit and for the associated second vertical roller unit, wherein the first vertical roller unit and the second vertical roller unit are advanced into the operating position relative to the center line after the calibration process, so that the outer edge of the first and second vertical rollers facing the rolled material has the same spacing from the center line.

[0013] Within the scope of the present application, a distinction is made between the operating position and the calibration position of the vertical roller unit. The operating position in the sense of the present application is understood to mean the position of the vertical roller unit which the vertical rolling stand assumes as a target position when the vertical rolling stand is in operation. The calibration position in the sense of the present application is understood to mean, as already mentioned previously, the position of the vertical roller unit in which at least one reference surface at the movable part of the vertical rolling stand comes to rest against a reference surface of the stationary or position-fixed part of the vertical rolling stand when the vertical rolling stand is not in rolling operation.

[0014] Preferably, the calibration process is carried out separately for each vertical roller and independently of the calibration process of the respective other vertical roller.

[0015] In an advantageous variant of the method according to the application, it is proposed that the calculation of the calibrated initial spacing is based on a given diameter of the vertical roller. The given diameter can be calculated from a target diameter which takes into account changes caused by wear during the rolling process and serves as a basis for calculating the calibrated initial spacing.

[0016] The reference surfaces at the stationary components of the vertical rolling mill stand are associated with each reference surface at the movable components of the vertical rolling mill stand. The stationary components of the vertical rolling mill stand are, for example, the crosshead, the support column and the upper and lower roller beams.

[0017] The orientation of the reference surface at the movable component of the vertical rolling stand is determined and known with regard to the spacing of the outer edge of the vertical roll pointing to the rolled material. The orientation of the reference surface at the stationary component of the vertical rolling stand is determined and known with regard to the spacing from the center line of the rolling train.

[0018] For the case that both the stationary reference surface and the movable reference surface are on the side of the vertical roll pointing to the rolled material, the actual, to be calibrated spacing from the center line of the rolling train up to the outer edge of the vertical roll pointing to the rolled material can be calculated via the following equation:

[0019]

[0020]

[0021] wherein

[0022] A kal denotes the calibrated initial spacing of the outer edge of the vertical roll pointing to the rolled material from the center line of the rolling train,

[0023] A stat denotes the spacing of the stationary reference surface from the center line of the rolling train,

[0024] A bew denotes the spacing of the movable reference surface from the center line of the vertical roll, and

[0025] D W denotes the diameter of the vertical roll.

[0026] The calibrated total opening of the vertical rolling stand is derived from the sum of the individual calibration results for the first side, for example for the drive side of the vertical rolling stand, and for the second side, for example for the operating side.

[0027] The above calculation is based on the calibration position being on the side of the vertical roll pointing to the rolled material. Within the scope of the present application, it is equally feasible functionally and technically to have the following calibration positions, which are respectively at the outer region of the vertical rolling stand. In this case, the reference surfaces are respectively located at the outer region of the vertical rolling stand. Then, the contact reference surfaces, which can be provided, for example, on the one hand statically at the crosshead and on the other hand movably at the crossbeam, are contacted.

[0028] The adjustment of the vertical roll unit into the calibration position and / or the adjustment of the vertical roll unit into a defined operating position is advantageously carried out by means of at least one adjustment system and / or by means of at least one reset system.

[0029] The adjustment system can comprise at least one element which moves in translation, for example an adjustment cylinder or an adjustment screw. Likewise, the reset system can comprise at least one element which moves in translation, in the form of a screw drive or a return cylinder.

[0030] Although the adjustment system and / or the reset system can in principle be configured as a mechanical system, they are preferably configured as a hydraulic system comprising the respective piston cylinder devices.

[0031] Advantageously, the vertical roll unit is adjusted into the defined operating position by means of the at least one adjustment system and / or by means of the at least one reset system.

[0032] Preferably, the calibration process is monitored via at least one measuring element, for example via a position sensor, so that a target / actual comparison of the actual position of the vertical roll and the desired position can be carried out. To this end, at least one position sensor can be provided in and / or at the adjustment system.

[0033] For example, the reaching of the defined operating position of the vertical roll unit can be monitored by means of at least one position sensor by means of at least one measuring element, preferably at the at least one hydraulic piston cylinder device of the at least one hydraulic adjustment system and / or of the at least one hydraulic reset system.

[0034] One preferred variant of the method is characterized in that the method step a) comprises, firstly, preferably with an adjustment force, bringing at least one first reference surface of a defined orientation at the vertical roll unit or at a movable component adjoining the vertical roll unit into abutment with at least one second reference surface of a defined orientation at the vertical roll stand which is fixed relative to the center line position. Such a movable component can be, for example, a crosspiece or a fitting of the vertical roll stand.

[0035] The adjustment of the vertical roll unit according to the method step a) can be carried out with increasing speed over a first path and with decreasing speed over a second path until the first reference surface and the second reference surface come into contact with one another.

[0036] Thereafter, preferably, upon the measuring surfaces corresponding to one another coming into contact with one another, an increased adjustment force is provided, and the vertical roll unit is subsequently reset by means of the associated movable component until the defined unloading position. The increase in the adjustment force and the duration of the action are each limited in themselves.

[0037] The adjustment force of the reference surfaces coming into contact with one another can be monitored by means of at least one pressure sensor at the at least one piston cylinder device of the hydraulic adjustment system and / or of the hydraulic reset system and limited to a predefined maximum value. The pressure sensor acts like a limit switch. If a mechanical adjustment system is provided, at least one pressure sensor in the form of a pressure measuring tank can be provided to monitor and limit the adjustment force.

[0038] If the reference surfaces at the movable and stationary components of the vertical rolling stand are arranged relative to each other such that they have reached a position in which a further change in position is not possible upon reference surface contact, the actual position of the outer edge of the vertical roll pointing towards the rolled material can be compared with the target position.

[0039] The calibration method can be performed if the rolled material leaves the vertical rolling stand, for example during a rolling gap, in a maintenance operation or during maintenance. The calibration method can also be performed when the rolled material is located in the rolling stand, if the vertical roll unit is adjusted into the calibration position relative to a stop of the vertical rolling stand transversely to the center line of the rolling mill train, wherein the stop is arranged at the crosshead of the rolling stand.

[0040] A further aspect of the application relates to a calibration device at a vertical rolling stand in a rolling mill train for rolling metal products, which calibration device is preferably used to perform the above-described method, the calibration device having at least two vertical rolls each supported in a vertical roll unit, the vertical rolls defining a roll gap and the vertical rolls being adjustable relative to a predefined center line of a plurality of components of the rolling mill train arranged in the rolling mill train by means of at least one preferably hydraulic adjustment system and / or at least one preferably hydraulic reset system, wherein the calibration device comprises at least one first reference surface at a component adjacent to or connected to the vertical roll unit at the vertical roll unit or movable therewith and at least one second reference surface stationary relative to the center line and a control device by means of which the adjustment of the vertical roll unit transversely to the center line relative to the second reference surface of a stationary stop of the vertical rolling stand can be caused by means of at least one position sensor of the adjustment system and / or the reset system in order to ascertain a calibrated initial position and to calculate a calibrated initial spacing between the outer edge of the vertical roll pointing towards the rolled material and the center line and the vertical roll unit can be caused to be adjusted into a defined rolling position.

[0041] The vertical rolling stand in which the method according to the application is provided and at which the calibration device according to the application is provided does not necessarily have to comprise a reset system.

[0042] The reset system is only required if the adjustment system is not fixedly connected to the cross member or the insert. The movement of the adjustment system transversely to the center line then also causes a movement of the insert. However, a movement in the direction of the crosshead does not cause a corresponding movement of the insert. In this case, a reset system is provided which follows the movement of the adjustment system with the insert. In the vertical rolling stand, the adjustment system can be fixedly connected to the cross member or the insert. In this case, a separate reset system is not required. The adjustment system then also assumes the function of the reset system.

[0043] In an advantageous design of the calibration device according to the application it is proposed that at least one first reference surface is provided at least at the upper and / or lower fitting of the vertical roll, and preferably at least one second stationary reference surface is provided at the upper and / or lower roll beam of the vertical rolling mill stand.

[0044] A further advantageous design of the calibration device proposes that at least one first reference surface is provided at a component adjoining or connected to the vertical roll unit, for example a cross beam, and at least one second reference surface is provided at the respective corresponding cross head of the vertical rolling mill stand. Preferably, at least one of the first reference surface and / or the second reference surface is adjustable in its orientation.

[0045] Advantageously, the at least one first reference surface and / or the at least one second reference surface is designed as an adjustable or settable and / or replaceable measuring plate.

[0046] Furthermore, the calibration device according to the application preferably comprises at least one position sensor for monitoring the position of the vertical roll unit.

[0047] Additionally, at least one pressure sensor can be provided, via which an adjustment force of the at least one first reference surface relative to the at least one second reference surface can be limited. BRIEF DESCRIPTION OF DRAWINGS

[0048] The application is explained below on the basis of the embodiments shown in the drawings.

[0049] The drawings show:

[0050] Figure 1 a schematic view of a vertical rolling mill stand with a calibration device according to the application, partially in cross section and viewed in the direction of travel of the rolled piece, and

[0051] Figure 2 a top view of the vertical rolling mill stand shown, partially in cross section. Figure 1 a top view of the vertical rolling mill stand shown, partially in cross section. DETAILED DESCRIPTION

[0052] The vertical rolling stand 1 with the calibration device according to the application comprises two vertically adjustable roller units 3 which are arranged in position-fixed roller supports. The roller supports are aligned relative to the center line 2 of a plurality of components of the rolling train which are arranged in the rolling train, for example rolling stands, lateral guide devices, roller tables and the like. In the drawing a crosshead 4, a support bar 5 and upper and lower roll chocks 6A and 6B of the vertical rolling stand 1 are shown. The vertical roller units 3 each comprise a vertical roller 7 which is supported in an upper and a lower mounting 8A and 8B. The mountings 8A, 8B are connected to each other via a crossbar 9 and can be adjusted relative to each other and relative to the center line 2 by means of the crossbar 9. The adjustment of the vertical roller units 3 takes place via an adjustment system and via a reset system. The adjustment system comprises on each side (operational side and drive side) of the vertical rolling stand 1 an upper and a lower adjustment cylinder 10A, 10B which act on the upper and lower mountings 8A, 8B, respectively.

[0053] The reset system comprises on each side a return cylinder 11 which is operatively connected to the crossbar 9, respectively. The crossbar 9 can be moved together with the mountings 8A, 8B.

[0054] Figure 1 The vertical rolling stand 1 is shown in a position in which it is not in rolling operation, more precisely with the vertical roller units 3 in a position in which they are in a calibration position in which the vertical roller units 3 are advanced relative to the position-fixed stop of the vertical rolling stand 1 in the direction of the center line 2 of the rolling train. The position-fixed stop is formed by a stationary reference surface which has a specific and known orientation relative to the center line 2, at which the vertical roller units 3 are in the calibration position. The position of the vertical roller units 3 is shown in the drawing by the position of the vertical rollers 7. Figure 1 The movable reference surface at the vertical roller units 3 is shown in the position in which it is in abutment with the stationary reference surface. In the described embodiment, the stop is formed by position-fixed or stationary measuring plates 12A and 12B which are arranged on both sides of the upper and lower roll chocks 6A and 6B, respectively. It is sufficient for the function of the calibration device that only one of the stationary measuring plates 12 is provided at the upper roll chock 6A or at the lower roll chock 6B.

[0055] An upper and a lower movable measuring plate 14A, 14B is provided as a movable reference surface at the upper and lower mountings 8A, 8B of the vertical roller units 3 on the side of the mountings 8A, 8B which faces the center line 2, respectively. The movable measuring plates 14A, 14B are fixed on the respective mountings 8A, 8B in an adjustable manner, if necessary, and are movable together with the mountings 8A, 8B. The stationary measuring plates 12A, 12B have a known specific orientation relative to the center line 2, the movable measuring plates 14A, 14B have a known specific orientation relative to the outer edge 13 of the vertical rollers 6 which faces the rolled material.

[0056] As already mentioned at the outset, the outer edge 13 of the vertical roll 7, which is directed towards the centre line 2, should have the same spacing from the centre line 2 of the rolling mill stand in the operation of the vertical rolling mill stand 1, i.e. in the operating position of the vertical roll unit 3. For this purpose, the vertical rolling mill stand 1 needs to be calibrated.

[0057] According to the application, an automatic calibration is proposed, which comprises an adjustment system and a return system of the vertical rolling mill stand 1. The adjustment system and the return system or the adjustment cylinders 10A and 10B and the return cylinder 11 belonging thereto are operated via a control device S. At least one of the adjustment cylinders 10A comprises a position sensor PG via which an actual position and a position to be operated of the vertical roll 7 concerned can be compared target / actual. Furthermore, a pressure sensor DG is provided, which can monitor the pressure loading of the return cylinder 11. Alternatively or additionally, a pressure sensor DG can be provided at one or more adjustment cylinders 10A, 10B, respectively. The automatic calibration according to the application is carried out separately for each side (operating side and drive side) of the vertical rolling mill stand 1 and independently of the respective other side. The sensor devices required for this are provided on each side of the vertical rolling mill stand 1. However, in the Figure 1 the control device, the position monitoring device and the pressure monitoring device are only shown for one side. This embodiment is to be understood in such a way that for each side of the vertical rolling mill stand 1 such a control device, position monitoring device and pressure monitoring device are provided.

[0058] In order to determine the calibrated spacing or the initial spacing A kal When the vertical rolling mill stand 1 is not in the rolling operation, the control device S first causes an adjustment of the upper and lower infeed 8A, 8B in the direction of the centre axis 2 by means of the adjustment cylinders 10A, 10B and the return cylinder 11 until the movable measuring plates 14A, 14B abut against the stationary measuring plates 12A, 12B. The adjustment movement takes place at a relatively high speed on a first path and at a relatively low speed on a second path with the application of a preset adjustment force, the rise of which is monitored via the pressure sensor DG. When the pressure detected by the pressure sensor DG exceeds a preset value, the process is ended. By this, the end position of the vertical roll unit 3 in the calibration position is detected. In this position, the spacing A stat and A bew is determined and known, from which the calibrated initial spacing A kal of the outer edge 13 of the vertical roll 6 directed towards the rolling object or the centre line from the centre line 2 can be calculated from the formula A stat = A bew + D W / 2. The diameter D kal of the vertical roll. WIncluded in the calculation, the diameter is preferably calculated with the target diameter taking into account changes caused by wear during the rolling process and stored in the control device S.

[0059] From the calibrated initial spacing, the same spacing from the center line 2 can be set for the operating position preset of the vertical roller unit 3, respectively.

[0060] Alternatively or additionally, as already mentioned in the introduction, it is within the scope of the application to functionally and technically provide a calibration position, which is respectively located at the outer region of the vertical rolling mill stand 1. In this case, the reference surface is respectively located at the outer region of the vertical rolling mill stand 1. This is only shown in the drawings in a schematic manner with dashed lines. The upper and lower movable measuring plates in the alternative design are denoted with 14A' and 14B'. In the alternative design, the upper and lower stationary measuring plates are denoted with 12A' and 12B'. In the alternative design, the upper and lower movable measuring plates 14A' and 14B' are arranged on the side of the crosshead 9 facing away from the vertical roller 7. In contrast, the upper and lower stationary measuring plates 12A' and 12B' are arranged on the side of the crosshead 4 of the vertical rolling mill stand 1 facing towards the vertical roller 7. It follows therefrom that the calibration position is the position in which the vertical roller 7 is completely moved away.

[0061] List of reference signs

[0062] 1 vertical rolling mill stand

[0063] 2 center line of the rolling mill train

[0064] 3 vertical roller unit

[0065] 4 crosshead of the vertical rolling mill stand

[0066] 5 support rod

[0067] 6A upper roller beam

[0068] 6B lower roller beam

[0069] 7 vertical roller

[0070] 8A upper inlay

[0071] 8B lower inlay

[0072] 9 crosshead

[0073] 10A upper adjustment cylinder

[0074] 10B lower adjustment cylinder

[0075] 11 return cylinder

[0076] 12A upper stationary measuring plate

[0077] 12B lower stationary measuring plate

[0078] 12A' upper stationary measuring plate, alternative arrangement

[0079] 12B' lower stationary measuring plate, alternative arrangement

[0080] 13 outer edge of the vertical roll facing the rolled material

[0081] 14A upper movable measuring plate

[0082] 14B lower movable measuring plate

[0083] 14A' upper movable measuring plate, alternative arrangement

[0084] 14B' lower movable measuring plate, alternative arrangement

[0085] S control device

[0086] PG position sensor

[0087] DG pressure sensor

[0088] A kal calibrated initial spacing

[0089] A stat spacing of the stationary reference surface from the center line of the rolling mill train

[0090] A bew spacing of the movable reference surface from the center line of the vertical roll

[0091] D W diameter of the vertical roll

Claims

1. A method for automatically calibrating vertical rolls (7) of a vertical rolling mill stand (1), which vertical rolls are each supported in a vertical roll unit (3) that can be adjusted relative to a predefined center line (2) of a plurality of components arranged in a rolling mill train, comprising the following method steps: a) adjusting the vertical roll unit (3) relative to at least one positionally fixed stop of the vertical rolling mill stand (1) transversely to the center line (2) into a calibration position, the positionally fixed stop having a known specific orientation relative to the center line (2); b) adjusting the vertical roll unit (3) into a defined operating position, c) adjusting the vertical roll unit (3) into a defined operating position, the vertical rolls each having a respective positionally fixed stop, the calibration process for each vertical roll (7) being carried out individually and independently of the calibration process for the opposite vertical roll (7). The calibration process is carried out for a first vertical roll unit (3) and for a second vertically oppositely arranged vertical roll unit (3), wherein the first and the second vertical roll unit (3) are brought into the operating position relative to the center line (2) after the calibration process, such that the vertical rolls (7) have the same spacing from the center line (2) toward the outer edge (13) of the rolled material. The vertical roll unit (3) is adjusted according to method step a) by means of at least one adjustment system and by means of at least one reset system. b) calculating a calibrated initial spacing A between the outer edge (13) of the pointing roll or pointing the center line (2) in the calibration position kal ; and Whether the defined operating position is reached is monitored at the at least one hydraulic piston-cylinder device of the at least one adjustment system and of the at least one reset system by means of at least one measuring element. wherein The at least one measuring element is a position sensor (PG).

2. The method of claim 1, wherein, The method step a) comprises, first, abutting at least one first reference surface of defined orientation at the vertical roll unit (3) or at a component movable with the vertical roll unit (3) adjoining the vertical roll unit (3) against at least one second reference surface of defined orientation at the vertical rolling mill stand (1) that is positionally fixed relative to the center line (2).

3. The method according to claim 1 or 2, characterized in that, calibrated initial distance A kal The calculations are made on the basis of the given diameter D of the vertical roller (7) W respectively.

4. The method according to claim 1 or 2, characterized in that, The diameter D of the vertical roller (7) is calculated on the basis of the target diameter taking into account the changes caused by wear during rolling W and as a basis for calculating the calibrated initial spacing A kal .

5. The method according to claim 1 or 2, characterized in that, The method step a) comprises, first, abutting at least one first reference surface of defined orientation at the vertical roll unit (3) or at a component movable with the vertical roll unit (3) adjoining the vertical roll unit (3) against at least one second reference surface of defined orientation at the vertical rolling mill stand (1) that is positionally fixed relative to the center line (2) with the use of an adjustment force.

6. The method of claim 1 or 2, wherein, The adjustment of the vertical roll unit (3) according to method step a) is carried out with increasing speed over a first path and with decreasing speed over a second path until the first and the second reference surface come into contact with one another.

7. The method of claim 6, wherein, The adjustment force of the reference surfaces in contact with one another is monitored by means of at least one pressure sensor (DG) and is limited to a predefined maximum value.

8. The method of claim 1 or 2, wherein, ​ 9. The method of claim 1 or 2, wherein, ​ 10. The method of claim 8, wherein, ​ 11. The method of claim 10, wherein, ​ 12. The method of claim 11, wherein, The adjustment forces of the reference surfaces in contact with each other are monitored by means of at least one pressure sensor (DG) at at least one hydraulic piston-cylinder device of the hydraulic adjustment system and the hydraulic return system.

13. The method of claim 1 or 2, wherein, The vertical roll unit (3) is adjusted into a defined operating position by means of at least one hydraulic adjustment system and by means of at least one hydraulic return system, wherein it is monitored by means of at least one measuring element whether the defined operating position is reached.

14. The method of claim 13, wherein, It is monitored by means of a position sensor (PG) at at least one hydraulic piston-cylinder device of at least one hydraulic adjustment system and at least one hydraulic return system whether the defined operating position is reached.

15. The method of claim 1 or 2, wherein, The method is carried out when the vertical rolling mill stand (1) is idling.

16. Calibration device at an upright rolling stand (1) in a rolling mill train for rolling metal products, for carrying out the method according to any one of claims 1 to 15, having exactly two upright rolls (7) each supported in an upright roll unit (3), which define a roll gap and which can be adjusted with respect to a pre-set center line (2) of a plurality of components provided in the rolling mill train by means of at least one adjustment system and at least one reset system, wherein the calibration device comprises at least one first reference surface of defined position at or movable with the at least one upright roll unit (3) and at least one second reference surface stationary with respect to the center line (2) and a control device (S), wherein the first reference surface is movable with the upright roll unit (3), wherein by means of the control device by means of at least one position sensor (PG) of the adjustment system and the reset system an adjustment of the upright roll unit transversely to the center line (2) with respect to the second reference surface as a position-fixed stop of the upright rolling stand (1) can be caused in order to find a calibrated initial position and to calculate a calibrated initial spacing A between an outer edge (13) of the upright roll (7) pointing in the direction of rolling or pointing in the direction of the center line (2) and the center line (2) kal and to cause an adjustment of the upright roll unit (3) into a defined operating position.

17. The calibration device of claim 16, wherein, The at least one adjustment system is a hydraulic adjustment system and the at least one return system is a hydraulic return system.

18. The calibration device of claim 16, wherein, At least one first reference surface is provided at least at the upper mounting part (8A) and / or at the lower mounting part (8B) of the vertical roll (7) respectively and / or at an adjoining component which is movable with the vertical roll unit (3).

19. The calibration device according to any one of claims 16 to 18, characterized in that At least one stationary second reference surface is provided at least at the upper roll beam and / or at the lower roll beam (6) of the vertical rolling mill stand (1) respectively at the crosshead (4) of the vertical rolling mill stand (1).

20. The calibration device of any one of claims 16 to 18, wherein, The orientation of at least one of the first reference surface and the second reference surface can be adjusted.

21. The calibration device of any one of claims 16 to 18, wherein, At least one of the first reference surface and / or at least one of the second reference surface is configured as an adjustable or exchangeable measuring plate (12A, 12B; 14A, 14B).

22. The calibration device of any one of claims 16 to 18, wherein, The calibration device comprises at least one position sensor (PG) for monitoring the position of the vertical roll unit (3).

23. The calibration device of any one of claims 16 to 18, wherein, At least one pressure sensor (DG) is provided via which the adjustment forces of at least one first reference surface relative to at least one second reference surface can be limited.

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