Rolling mill for rolling metal strips, roll arrangement for use in such a rolling mill and method for refurbishment of a rolling mill - Patents.com

Abstract

The present invention relates to a rolling mill (1) for rolling a metal strip, the rolling mill having at least one first and one second work roll (4, 6, 6') defining a roll gap (W) therebetween, and at least one first and one second backup roll (11, 12), in a common roll stand (2), wherein at least one of the work rolls (4, 6') is supported in a work roll chock (5, 9'), and the backup rolls (11, 12) are supported in a backup roll chock (13, 14), and the work roll chocks (5, 9') relates to a rolling mill (1) characterized in that the first and / or second work rolls (4, 6') are each configured to be replaceable with a roll arrangement (10) comprising one work roll (6) of smaller diameter and at least one additional roll (8), the smaller diameter work roll (6) being supported via the additional roll (8), the additional roll being supported in an additional roll chock (7), and the smaller diameter work roll being disposed in a work roll bearing (9) of the additional roll chock (7). The invention further relates to a roll arrangement (10) for use in such a rolling mill (1) and to a method for retrofitting the rolling mill (1).

Description

[Technical field]

[0001] The present invention relates to a rolling mill for rolling metal strip having at least first and second work rolls defining a roll gap therebetween and at least first and second back-up rolls, the work rolls being supported in work roll chocks and the back-up rolls being supported in back-up roll chocks within a common roll stand. [Background technology]

[0002] For cold rolling of high strength and thin metal strips at high reductions, retrofittable roll stands with 18 or 20 rolls are often used. These roll stands have relatively small work rolls, but are technically complex and require maintenance. Retrofitting from a 4-roll configuration to a multi-roll configuration is laborious.

[0003] Since high strength, thin strip made from special alloys is a niche product, the use of specialized multi-roll stands such as Sendzimir constructions is often not economical.

[0004] What all these roll stand types have in common is that small work rolls are mounted in the roll stand without their own bearings and are fixed and guided vertically and laterally by additional devices, in particular by backup rolls. Small work rolls without bearings are manually introduced into and removed from the roll stand in the prior art. Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is therefore to provide a rolling mill of the type mentioned at the outset, which makes it possible to roll high-strength and thin metal strip at high reductions by relatively simple means.

[0006] Furthermore, the object of the present invention is to provide a rolling mill which can be retrofitted relatively easily for different requirements. [Means for solving the problem]

[0007] The problem underlying the invention is solved by the features of the independent claims. Advantageous configurations of the invention emerge from the dependent claims.

[0008] One aspect of the invention relates to a rolling mill for rolling metal strip, the rolling mill having at least first and second work rolls defining a roll gap therebetween and at least first and second backup rolls, in a common roll stand, at least one of the work rolls being supported in work roll chocks and the backup roll being supported in the backup roll chocks, the work roll chocks being configured such that the first and / or second work rolls are each exchangeable for a roll arrangement comprising one work roll of smaller diameter and at least one additional roll, the smaller diameter work roll being supported via the additional roll, the additional roll being supported in the additional roll chock, and the smaller diameter work roll being disposed in a work roll bearing of the additional roll chock.

[0009] According to the invention, it is proposed to configure the roll arrangement in such a way that a given work roll pair arrangement of a roll stand with a large roll diameter can be rearranged so that one and / or both work rolls can be replaced by one work roll with a smaller diameter and one additional roll, whereby various configurations of the rolling mill can be realized. In the case of a rolling mill variant in which both the first and the second work rolls are replaced by a roll arrangement with one work roll with a smaller diameter and one additional roll, this results in an overall symmetrical work roll pair arrangement with smaller work rolls, with which a comparatively high reduction can already be achieved.

[0010] Due to the unique support of the small diameter roll in the associated work roll bearing, the position of this work roll can be precisely defined both axially and vertically relative to the additional roll and / or to the work roll which cooperates with this additional roll to define the roll gap. This results in particularly stable rolling conditions. Due to the positional stability during rolling as well as during roll changes, the setting of the work roll pairing can be easily performed. In that respect, the invention is also particularly suitable for the modernization of existing installations in order to expand the product spectrum.

[0011] Preferably, the position of the work roll bearings within the roll arrangement is adjustable, and therefore the position of the small diameter work rolls. In accordance with the invention, the work roll bearings fulfill the function of small "work roll chocks" movable within and with the additional roll chocks.

[0012] Particularly preferably, the position of the work roll bearings is adjustable axially and / or laterally relative to the longitudinal extent of the roll gap.

[0013] This ensures that the position of the axis of rotation of the work roll in the roll arrangement is adjustable or settable relative to the position of the axis of rotation of the additional roll.

[0014] Such an adjustment may be necessary, for example, to set a so-called offset, which is understood to be an axial center offset or offset of the longitudinal center axis of the additional roll on the one hand and the longitudinal center axis of the work roll on the other hand, which improves the stability of the arrangement against horizontal displacements. In principle, the offset can be set by wear plates or shims of different thicknesses, which are respectively arranged in pockets or recesses of the work roll chocks of the roll arrangement. Alternatively, a hydraulic piston-cylinder arrangement can be provided for this purpose.

[0015] The work roll bearings may be supported on viscoelastic buffers that lift the work roll of the roll set from the add-on roll as soon as they are no longer under load, thereby avoiding surface contact between the work roll and add-on roll of the roll set during assembly and disassembly of the roll set.

[0016] In an advantageous and preferred variant of the roll arrangement according to the invention, either the first or the second work roll is replaced by a roll arrangement with a work roll of smaller diameter and an additional roll. Particularly preferably, according to the invention, a rolling mill is provided with a first upper work roll of a relatively large diameter and a lower roll arrangement with a work roll of smaller diameter. This asymmetric arrangement of the work rolls with a first upper work roll of a relatively large diameter and a second lower work roll of a relatively small diameter has proven to be particularly advantageous in view of the reduction rates to be achieved. Such a diameter ratio of the work rolls is advantageous in that a rolling result can be achieved which corresponds to a rolling pass in which each work roll has a work roll pair arrangement corresponding to the arithmetic mean of the diameters of the large and small work rolls.

[0017] Preferably, the additional rolls have a larger diameter than the work rolls of the roll unit.

[0018] In a preferred and expedient variant of the rolling mill according to the invention, it is provided that the first or second work roll is configured as a small or large diameter work roll, and that the small diameter work roll has a diameter that is less than half the diameter of the large work roll.

[0019] Expediently, the rolling mill according to the invention is designed such that the additional roll chocks of the roll unit have an outer contour that approximately corresponds to the outer contour of the work roll chocks for one work roll with a larger diameter. This configuration ensures, in particular, a simple retrofitting capability of the rolling mill. It can thus be ensured that the additional roll chocks of the roll unit can be accommodated interchangeably in the mounting space of the work roll chocks in the roll stand of the rolling mill. No reconfiguration work is required in the stand area.

[0020] In an advantageous embodiment of the rolling mill according to the invention, it is provided that the first or second work roll is supported in a pocket or recess on the side facing the roll gap at the mounting location of the additional roll chock of the roll arrangement, thereby ensuring that no further adaptation of bending or balancing devices provided for the work rolls and / or the backup rolls is necessary.

[0021] The inventive configuration of the roll device formed as an independent functional unit allows roll changes, which at the same time are also configuration changes, to be realized simply, quickly and preferably fully automated by conventional means.

[0022] Essentially, it may be contemplated to support the small diameter work roll along at least a portion of the roll barrel on one or both sides, the small diameter work roll tending to bend transversely to the direction of strip travel over the length of the barrel transverse to its longitudinal axis.

[0023] According to the invention, this can be taken into account in that the first or second work roll is supported in an additional roll chock of the roll arrangement so as to be movable transversely to the axis of rotation and is supported on at least one side parallel to the axis of rotation over at least a part of its length by at least one fluid-supported bearing, the setting of the offset also being realised by means of a fluid-supported bearing.

[0024] In this embodiment variation, the fluid support bearing is endowed with a dual function: it compensates for small work roll deflections and sets the axial position of the work roll's axis of rotation relative to the axis of rotation of the additional roll.

[0025] Preferably, the fluid support bearing comprises at least one support shell extending over a substantial portion of the barrel length of the work roll of the roll arrangement. The support shells preferably each have a terminal end connected to the barrel of the work roll of the roll arrangement. Vibration Rest Alternatively, the support shell can be sealed against the spacer in the region of the bearing of the work rolls of the roll arrangement.

[0026] The lateral seals of the support shell are used to maintain a constant pressure of hydraulic medium between the support shell and the work rolls, such as rolling emulsions or rolling oils typically used for roll cooling and roll lubrication.

[0027] In an advantageous embodiment of the roll arrangement according to the invention, it is provided that the support shell is adjusted and / or held relative to the work roll via at least one, preferably hydraulic, adjusting device, which can be provided as an additional or external device to the rolling mill.

[0028] for example 、 At least one guide element for the rolled stock, which is provided in the rolling mill or rolling mill, can be provided or formed as adjustment device.

[0029] In a particularly advantageous embodiment of the rolling mill according to the invention, it is provided that at least one adjustment device is provided in a movable table or strip deflector associated with the rolling mill and arranged at the inlet and / or outlet side. It is expedient to integrate the adjustment device in the respective guide table for the rolled material.

[0030] The adjustment device can have a number of adjustment cylinders which act on the support shell by means of adjustment elements.

[0031] At least one additional roll chock of the roll set and / or at least one work roll bearing of the roll set may have at least one media coupling for lubricant and / or coolant and / or other hydraulic media.

[0032] The invention further relates to a roll arrangement for use in a rolling mill for rolling metal strip of the above-mentioned type, the roll arrangement having at least one additional roll and at least one work roll, the additional roll being supported in an additional roll chock and the work roll being arranged in a work roll bearing of the additional roll chock.

[0033] Preferably, the additional roll has a larger diameter than the work roll.

[0034] To ensure that the roll arrangement has a configuration that closely matches that of the work roll to be replaced, the invention provides that the work roll bearings are arranged in pockets on the side facing the roll gap at the mounting location of the additional roll chocks.

[0035] The work roll can be, for example, supported in a work roll bearing so as to be movable transversely to the longitudinal extent of the roll gap and supported on at least one side parallel to the axis of rotation over at least part of its length by at least one fluid-support bearing.

[0036] The work rolls may be laterally and / or vertically adjustable relative to the attachment rolls.

[0037] For this reason, the work roll bearings Append It may be contemplated that the roll chocks may be laterally and / or vertically adjustable.

[0038] Expediently, at least one additional roll chock and / or at least one work roll bearing, preferably both in each case, are provided with at least one medium coupling or medium connection for introducing a hydraulic medium, which can be a lubricant and / or a rolling emulsion as a medium for cooling and lubricating the work rolls and for maintaining the fluid pressure in the fluid support bearings.

[0039] The rolling device according to the invention preferably comprises one or more of the features previously disclosed in connection with the rolling device according to the invention.

[0040] The invention finally relates to a method for retrofitting a rolling mill for rolling metal strips, the rolling mill having at least one first and second work roll defining a roll gap therebetween, the rolling mill further having at least one first and second backup roll, the work rolls being supported in work roll chocks and the backup rolls being supported in backup roll chocks in a common roll stand, the first and / or second work roll being replaced by a roll arrangement having an additional roll supporting the work roll arranged in a work roll bearing, the diameter of the work roll of the roll arrangement being smaller than the diameter of the work roll to be replaced, and the external dimensions of the additional roll chocks of the roll arrangement substantially corresponding to the external dimensions of the work roll chocks of the work roll to be replaced.

[0041] The invention will now be described with reference to illustrative embodiments shown in the drawings. [Brief description of the drawings]

[0042] [Figure 1] FIG. 1 is a schematic and simplified view of a rolling mill according to the invention; [Figure 2A] Diagram of a conventional work roll pair [Figure 2B] Roll device according to the present invention [Diagram 3] FIG. 2B shows an enlarged view of the support of the work roll of the roll unit according to FIG. [Figure 4] FIG. 1 is a perspective view of a roll device according to the present invention; [Diagram 5] 5 is a perspective view of the rolling mill according to FIG. 4 from the drive side; [Figure 6] FIG. 1 shows a perspective view of a guide table for guiding a rolling stock having an adjustment device according to the invention [Figure 7] FIG. 7 is another perspective view of the guide table according to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] The rolling mill 1 according to the invention comprises a roll stand 2 having a roll housing 3 in which an upper (large) work roll 4, a lower (small) work roll 6 and an additional roll 8 are supported in an upper work roll chock 5. Between the work rolls 4, 6, roll A gap W is defined, through which roll gap a rolled material (not shown) in the form of a metal strip is guided.

[0044] The rolling mill 1 comprises, in a known manner, both bending and balancing cylinders by means of which the bending of the work rolls and the weight of the backup rolls can be compensated for, these devices being not shown in the drawings for reasons of simplicity. Furthermore, the rolling mill according to the invention comprises means for axially displacing the work rolls 4, 6, which are likewise not shown in the drawings for reasons of simplicity.

[0045] An axial movement or adjustment in the sense of this patent application is to be understood as a movement in the direction of the longitudinal axis of the roll in question, whereas a vertical movement or adjustment in the sense of this patent application is to be understood as an adjustment transverse to the longitudinal extent of the roll gap W.

[0046] In the vertical direction, the upper work roll 4 is supported on an upper backup roll 11, whereas the lower work roll 6 is supported on a lower additional roll 8. The additional roll 8 is supported on a lower backup roll 12. The upper backup roll 11 is supported in an upper backup roll chock 13, and the lower backup roll 12 is supported in a lower backup roll chock 14. The combination of the lower work roll 6 and the additional roll 8 constitutes a roll arrangement 10 within the meaning of the present invention. The roll arrangement 10 has an additional roll chock 7, in which a small diameter under The work roll 6 is supported via a work roll bearing 9 of an additional roll chock 7.

[0047] The work rolls 4, 6 perform the reduction of the rolled material in a manner known per se. The rolling mill 1 according to the invention is preferably configured as an apparatus for cold rolling metal strip and is designed for relatively high reductions.

[0048] In order to stabilize the entire roll set, both the upper backup roll chock 13 and the lower backup roll chock 14 are subjected to a force parallel to their longitudinal central axis in the roll housing 3 by a pusher cylinder 15, known per se, which opposes the transverse displacement of the backup rolls 11, 12. Such a stabilization is particularly advantageous for an odd number of rolls in a roll set. By means of the pusher cylinder 15, in a known manner, an offset of the longitudinal central axis of the backup rolls 11, 12 relative to the longitudinal central axis of the work rolls 4, 6 (longitudinal central offset) can be set. Due to the possible variable offset direction, the acting direction of the pusher cylinder 15 has to be calculated anew for each use and load moment. This is carried out via the control unit S of the rolling mill 1.

[0049] In the configuration of the rolling mill 1 shown in FIG. 1, it is provided that the lower work roll 6 has a diameter approximately half that of the upper work roll 4. The diameter of the additional roll 8 is slightly smaller than that of the upper work roll 4. As will be explained further below, the rolling mill 1 according to the invention can be retrofitted between different configurations having different roll pair arrangements. This has the advantage that, when a high-strength and thin strip made of special alloys is to be rolled at a high reduction, the rolling mill 1 can be retrofitted by simple means with a roll pair arrangement for rolling a less strong strip at a relatively low reduction.

[0050] The different roll pair arrangements of the rolling mill can be seen in particular from Figures 2A and 2B. Figure 2A shows an end view of a conventional work roll pair with a first upper work roll 4 and a second lower work roll 6', the upper work roll 4 being supported in an upper work roll chock 5 and the lower work roll 6' being supported in a lower work roll chock 9'. Both work rolls 4, 6' have the same diameter and accordingly constitute a symmetrical work roll pair arrangement.

[0051] According to the invention, it is contemplated that a rolling mill 1 according to the invention may be retrofitted such that either the upper work rolls 4 with their associated upper work roll chocks 5 or the lower work rolls 6' with their associated lower work roll chocks 9' are replaced with a roll arrangement 10 according to Figure 2B. This arrangement is illustrated in Figure 1.

[0052] The roll arrangement 10 according to FIG. 2B has external dimensions and a geometry that corresponds approximately to the geometry of the work roll chocks 4, 6' of a conventional work roll pair arrangement according to FIG. 2A. AppendThe upper work roll 6 has roll chocks 7. This is made possible in particular by the fact that an additional roll 8, the diameter of which corresponds approximately to or is slightly smaller than the diameter of the upper work roll 4, is supported in the lower additional roll chock 7 in correspondence with the upper work roll 4 in the upper work roll chock. The lower work roll 6 is supported in work roll bearings 9 which are respectively arranged in upper pockets 26 facing the roll gap W of the additional roll chocks 7.

[0053] In the case of a variant of the rolling mill 1 according to FIG. 1, it is provided that the position of the axis of rotation of the lower work roll 6 is adjustable by means of an exchangeable wear plate 16 .

[0054] In the variation of the roll device 10 shown in FIG. 2B, it is provided that the lower work roll 6 is supported for movement transversely to its longitudinal axis and is centered by a hydrodynamic bearing 17 in a pocket 26.

[0055] As can be seen in particular from FIG. 3, which shows a detailed view from FIG. 2B, the hydrodynamic bearing 17 has two support shells 18 which extend over substantially the entire length of the cylinder of the lower work roll 6, which support shells are sealed against the lower work roll 6. Via a media connection, which will be described below, the hydrodynamic bearing 17 is acted upon by a cooling / lubricant, e.g. a rolling emulsion, so that it is ensured that the support shells 18 enclose the work roll 6 between them, so that they do not rest on the surface of the work roll 6. In addition, a lateral seal, not shown, of the support shells 18 is provided, which seals against the lower work roll 6. Vibration Rest Being supported on seats ensures that the support shell 18 does not abut against the work roll 6 when the medium pressure is not established.

[0056] The additional roll chocks 7 furthermore comprise, in the region below the pockets 26, accommodations for viscoelastic buffers 27 which lift the small work roll 6 together with the associated work roll bearings 9 as soon as they are no longer loaded. This prevents the work roll 6 and the associated work roll bearings 9 from collapsing during a roll change, which could impair the surface quality of the small work roll 6. Append It is ensured that no surface contact between the rolls 8 occurs.

[0057] In the embodiment described, the small work roll 6 is equipped with two hydrodynamic bearings 17, one at the entry and one at the exit of the rolling mill 1. Working on one or both sides of the support shell 18 can be performed selectively. In other embodiments, a one-sided arrangement is also possible.

[0058] 4 shows a perspective view of a roll device 10 according to the present invention. Append The roll chock 7 includes a first medium coupling 24 for pressure supply to the hydrodynamic bearing 17 and a lower work roll 6 and Append A second media coupling 25 is provided for providing cooling and / or lubrication to the rolling bearings of the roll 8 .

[0059] The rolling emulsion is, for example, fed into the fluid axis with a volume flow of about 1000 l / min as a medium for pressure supply. Receiving It can be cycled through 17.

[0060] As can be seen from Figure 5, the rolling mill 1 according to the invention has, at least on one side, a guide table 19 for guiding the rolled material, the guiding plane of which extends approximately up to the height of the side of the lower work roll 6. The guide table 19 is provided, according to the invention, with means for adjusting and / or centering the support shell 18 of the hydrodynamic bearing 17 in the form of an adjusting bar 20 arranged movably relative to the guide table 19 by means of a feed cylinder 21.

[0061] The guide table 19 is shown in an enlarged perspective view in Figures 6 and 7. A guide table 19 is disposed under the guide table 19 (see Figure 7). FeedBy means of the cylinders 21, the adjusting bar 20 can be positioned relative to the support shell 18. The adjusting bar 20 further comprises a number of adjusting cylinders 22 which act by means of plungers 23 on the associated support shells of the hydrodynamic bearings 17. By means of the adjusting cylinders 22, the back pressure on the support shells 18 of the hydrodynamic bearings 17 can be set over the entire length of the cylinder of the lower work roll 6. In the case of the rolling mill 1 according to the invention, guide tables 19 can be provided both on the inlet and on the outlet.

[0062] The setting of the support shell 18 of the hydrodynamic bearing 17 is performed by an adjustment bar fixed to the guide table 19, so there is no need for additional adjustment means to be provided in the roll device 10. This allows the roll device 10 to be formed compactly and without additional adjustment means. 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 mill (1) for rolling a metal strip, comprising at least one first and second work rolls (4, 6, 6') defining a roll gap (W) therebetween, and at least one first and second backup rolls (11, 12), in a common roll stand (2), at least one of the work rolls (4, 6') being supported in a work roll chock (5, 9') and the backup rolls (11, 12) being supported in a backup roll chock (13, 14), and the work roll chocks (5, 9') is a rolling mill (1), characterized in that the first and / or second work rolls (4, 6') are formed so as to be exchangeable with a roll arrangement (10) comprising one work roll (6) of smaller diameter and at least one additional roll (8), respectively, the work roll of smaller diameter (6) being supported via the additional roll (8), the additional roll being supported in an additional roll chock (7), and the work roll of smaller diameter being arranged in a work roll bearing (9) of the additional roll chock (7). 2. 2. The rolling apparatus (1) according to claim 1, characterized in that the position of the work roll bearings (9) in the roll device (10) is adjustable. 3. 3. The rolling mill (1) according to claim 2, characterized in that the position of the work roll bearings is adjustable axially and / or laterally with respect to the longitudinal extent of the roll gap (W). 4. 4. The rolling apparatus (1) according to any one of the above items 1 to 3, wherein the additional roll (8) has a diameter larger than that of the work roll (6) of the roll device (10). 5. 5. The rolling apparatus (1) according to any one of 1 to 4 above, characterized in that the first or second work roll (4, 6, 6') is formed as a work roll having a small or large diameter, and the small diameter work roll (6) has a diameter equal to or less than half the diameter of the large diameter work roll (4, 6'). 6. 6. The rolling apparatus (1) described in the above item 5, characterized in that the diameter of the additional roll (8) is equal to or smaller than the diameter of the larger diameter work roll (4, 6'). 7. 7. The rolling mill (1) according to any one of 1 to 6 above, characterized in that the additional roll chock (7) of the roll unit (10) has an outer contour that substantially matches the outer contour of the work roll chock (5, 9') for one work roll (4, 6') of larger diameter. 8. The rolling apparatus (1) according to any one of 1 to 7 above, characterized in that the work roll bearing (9) is arranged in a pocket (26) on the side facing the roll gap (W) at the attachment position of the additional roll chock (7). 9. 9. The rolling apparatus (1) according to any one of 1 to 8 above, wherein the work roll (6) of the roll device (10) is supported on at least one side parallel to its axis of rotation over at least a portion of its length by at least one fluid support bearing (17). 10. The rolling apparatus (1) according to any one of 1 to 9 above, characterized in that the position of the rotation axis of the work roll (6) in the work roll bearing (9) of the roll device (10) is adjustable relatively to the position of the rotation axis of the additional roll (8). 11. 11. The rolling mill (1) according to claim 9 or 10, characterized in that the work roll (6) is movably supported in a work roll bearing (9) of the roll device (10) transversely to its axis of rotation and can be positioned by a support shell (18) of a fluid support bearing (17). 12. 12. The rolling apparatus (1) according to any one of claims 9 to 11, characterized in that the support shell extends over a substantial portion of the barrel length of the work roll (6). 13. 13. The rolling mill (1) according to claim 11 or 12, characterized in that the support shell (18) is adjusted and / or held relative to the work roll (6) via at least one preferably hydraulic adjusting device. 14. 14. The rolling device (1) according to claim 13, characterized in that as the adjustment device at least one guide element for the rolled material is provided. 15. 15. The rolling mill (1) according to claim 13 or 14, characterized in that the adjusting device comprises a number of adjusting cylinders (22) acting on the support shell (18) by means of adjusting elements (23). 16. 16. The rolling mill (1) according to any one of 1 to 15 above, characterized in that at least one roll chock (7) and / or at least one work roll bearing (9) of the roll unit (10) has at least one media coupling (24, 25). 17. A roll device (10) for use in a rolling mill (1) having any one of the features 1 to 16 above, characterized in that the roll device (10) has at least one additional roll (8) and at least one work roll (6), the additional roll (8) is supported in an additional roll chock (7), and the work roll (6) is disposed in a work roll bearing (9) of the additional roll chock (7). 18. 18. The roll device (10) according to claim 17, wherein the additional roll (8) has a larger diameter than the work roll (6). 19. 19. The roll device (10) according to claim 17 or 18, characterized in that the work roll bearing (9) is arranged in a pocket (26) on the side facing the roll gap (W) at the mounting position of the additional roll chock (9). 20. 20. The roll device (10) according to any one of claims 17 to 19, wherein the work roll (6) is supported on at least one side parallel to the axis of rotation over at least a portion of its length by at least one fluid support bearing (17). 21. 21. The roll device (10) according to claim 19 or 20, characterized in that the work roll bearing (9) is movably supported in a pocket (26) of the additional roll chock (7). 22. 22. The roll device (10) according to any one of the above 17 to 21, characterized in that at least one additional roll chock and / or at least one work roll bearing (9) is provided with at least one media coupling (24, 25) or media connection portion. 23. 1. A method for retrofitting a rolling mill for rolling metal strip, the rolling mill having at least first and second work rolls (4,6') defining a roll gap therebetween, and at least first and second backup rolls (11,12), in a common roll stand (2), at least one of the work rolls (4,6') being supported in a work roll chock (5,9') and the backup rolls (11,12) being supported in a backup roll chock (13,14), the method comprising the steps of: 1. A method according to claim 1, wherein the first and / or second work roll (4, 6') is replaced by a roll arrangement (10) having an additional roll (8) supporting a work roll (6) arranged in a work roll bearing (9), the diameter of the work roll (6) of the roll arrangement (10) being smaller than the diameter of the work roll (6') to be replaced, and the external dimensions of the additional roll chocks (7) of the roll arrangement (10) substantially correspond to the external dimensions of the work roll chocks (5) of the work roll (6') to be replaced. 24. 24. The method according to claim 23, characterized by the use of a roll device having one or more of the features of claims 17 to 22. [Explanation of symbols]

[0063] 1. Rolling equipment 2 Roll Stand 3 Roll Housing 4 Upper work roll 5. Upper work roll chock 6 Lower work roll 6' Conventional work roll vs. under-knit work roll 7 Additional Roll Chocks 8 Additional Rolls 9 Work roll bearings 9' Lower Work Roll Chock 10 Roller device 11. Backup role on 12 Lower backup roll 13. Upper backup roll chock 14 Lower backup roll chock 15 Pusher cylinder 16 Wear Plate 17 Fluid bearings 18 Support shell 19 Guide Table 20 Adjustment Bar 21 Feed cylinder 22 Adjustment cylinder 23 Plunger 24 First medium coupling 25 Second medium coupling 26 Pockets 27 Viscoelastic Buffer S Control Device W Roll Gap O Offset

Claims

1. A rolling mill (1) for rolling a metal strip, comprising at least first and second work rolls (4, 6, 6') defining a roll gap (W) therebetween, and at least first and second backup rolls (11, 12), in a common roll stand (2), at least one of the work rolls (4, 6') being supported in a work roll chock (5, 9') and the backup rolls (11, 12) being supported in a backup roll chock (13, 14), the work roll chocks (5, 9') are formed in such a way that the first and / or second work rolls (4, 6') are replaceable by a roll arrangement (10) comprising one work roll (6) of a smaller diameter and at least one additional roll (8), the work roll of the smaller diameter (6) being supported via the additional roll (8), the additional roll being supported in the additional roll chock (7), the work roll of the smaller diameter being arranged in a work roll bearing (9) of the additional roll chock (7); the position of the work roll bearings (9) in the roll arrangement (10) is adjustable, the position of the work roll bearings (9) being adjustable axially and / or in the strip movement direction such that the position of the axis of rotation of the work roll (6) in the work roll bearings (9) of the roll arrangement (10) is adjustable relative to the position of the axis of rotation of the additional roll (8); and A rolling mill (1), characterized in that the external contour of the additional roll chock (7) of the roll unit (10) is formed so that the work roll chock (5, 9') for the work roll (4, 6') to be replaced can be replaced by the additional roll chock (7) of the roll unit (10) without changing the installation space in the roll stand of the rolling mill.

2. 2. The rolling mill (1) according to claim 1, characterized in that the additional rolls (8) have a larger diameter than the work rolls (6) of the roll arrangement (10).

3. 3. A rolling mill (1) according to claim 1 or 2, characterized in that the first or second work roll (4, 6, 6') is configured as a small or large diameter work roll, and the small diameter work roll (6) has a diameter which is less than half the diameter of the large diameter work roll (4, 6').

4. 4. The rolling mill (1) according to claim 3, characterized in that the diameter of the additional roll (8) is equal to or smaller than the diameter of the larger diameter work roll (4, 6').

5. The rolling apparatus (1) according to any one of claims 1 to 4, characterized in that the work roll bearings (9) are arranged in pockets (26) on the side facing the roll gap (W) at the mounting position of the additional roll chocks (7).

6. 6. The rolling mill (1) according to claim 1, wherein the work roll (6) of the roll unit (10) is supported on at least one side parallel to its axis of rotation over at least a portion of its length by at least one fluid support bearing (17).

7. 7. The rolling mill (1) according to claim 6, characterized in that the work rolls (6) of the roll unit (10) are supported in a movable manner in the strip movement direction in work roll bearings (9) of the roll unit (10) and can be positioned by support shells (18) of fluid support bearings (17).

8. 8. Rolling mill (1) according to claim 6 or 7, characterised in that the support shell extends over a substantial part of the barrel length of the work roll (6).

9. 9. Rolling mill (1) according to claim 7 or 8, characterized in that the support shell (18) is adjusted and / or held relative to the work rolls (6) via at least one adjustment device.

10. 10. The rolling mill (1) according to claim 9, characterized in that as adjustment device at least one guide element for the rolled stock is provided.

11. 11. Rolling mill (1) according to claim 9 or 10, characterized in that the adjustment device comprises a number of adjustment cylinders (22) acting on the support shell (18) by means of adjustment elements (23).

12. 12. The rolling mill (1) according to any one of claims 1 to 11, characterized in that at least one roll chock (7) and / or at least one work roll bearing (9) of the roll unit (10) has at least one media coupling (24, 25).

13. A roll arrangement (10) for use in a rolling mill (1) having any one of the features of claims 1 to 12, 1. A roll arrangement (10) comprising at least one additional roll (8) and at least one work roll (6), the additional roll (8) being supported in an additional roll chock (7), the work roll (6) being arranged in a work roll bearing (9) of the additional roll chock (7), and the work roll bearing (9) being adjustable axially and / or in the strip movement direction in a pocket (26) of the additional roll chock (7).

14. 14. The roll arrangement (10) according to claim 13, characterized in that the additional roll (8) has a larger diameter than the work roll (6).

15. 15. The roll device (10) according to claim 13 or 14, characterized in that the work roll bearings (9) are arranged in pockets (26) on the side facing the roll gap (W) at the mounting position of the additional roll chocks (7).

16. 16. The roll arrangement (10) according to any one of claims 13 to 15, characterized in that the work roll (6) is supported on at least one side parallel to the axis of rotation over at least a part of its length by at least one fluid support bearing (17).

17. 17. The roll arrangement (10) according to any one of claims 13 to 16, characterized in that at least one additional roll chock and / or at least one work roll bearing (9) comprises at least one media coupling (24, 25) or media connection.

18. A method for retrofitting a rolling mill for rolling metal strip, the rolling mill having at least first and second work rolls (4, 6') defining a roll gap therebetween and at least first and second backup rolls (11, 12), at least one of the work rolls (4, 6') being supported in a work roll chock (5, 9') and the backup rolls (11, 12) being supported in a backup roll chock (13, 14) in a common roll stand (2), comprising: the first and / or second work roll (4, 6') is replaced by a roll arrangement (10) having an additional roll (8) supporting the work roll (6) arranged in a work roll bearing (9), the diameter of the work roll (6) of the roll arrangement (10) being smaller than the diameter of the work roll (6') to be replaced; the position of the work roll bearings (9) in the roll arrangement (10) is adjustable, the position of the work roll bearings (9) being adjustable axially and / or in the strip movement direction such that the position of the axis of rotation of the work roll (6) in the work roll bearings (9) of the roll arrangement (10) is adjustable relative to the position of the axis of rotation of the additional roll (8); and the additional roll chocks (7) of the roll unit (10) have external dimensions such that the work roll chocks (5, 9') for the work rolls (4, 6') to be replaced can be replaced by the additional roll chocks (7) of the roll unit (10) without changing the installation space in the roll stand of the rolling mill.

19. Method according to claim 18, characterized by the use of a roll device having any one of the features of claims 13 to 17.

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