A cassette for at least one work roll in a rolling stand

Abstract

The invention relates to a cassette 100 for at least one work roll 10 in a rolling stand 50 for rolling material, in particular metal strip, which cassette has: a cassette basic body 110 with an elongated cut-out 112, which is defined by two oppositely located short sides and two oppositely located long sides, the work roll being rotatably supported on said short sides; at least one support shell 120; at least one support bridge 130 supported in the cassette basic body as a carrier for the support shell 120; and at least one pressing mechanism 140 for an articulable connection of the support bridge to one of the long sides of the cassette basic body and for pressing the support shell against the surface of the work roll with a horizontal pressing force. In order to prevent horizontal bending of the elongated work rolls even in the event of high rolling forces, the invention proposes that the bending stiffness of the support bridge 130 is greater than the bending stiffness of the pressure mechanism 140, which is in a coupled state with the long side of the cassette basic body and which houses the pressure mechanism.

Description

[Technical field]

[0001] The present invention relates to a cassette for at least one work roll in a rolling stand for rolling a rolled stock. Furthermore, the present invention relates to a rolling stand having at least one such cassette as well as to a method for pressing a pressing cylinder in such a cassette. [Background technology]

[0002] The background of the present invention is the physical fact that in conventional rolling stands with four or six rolls, without horizontal support of the work rolls, the permissible work roll diameter is limited downwards, since only work rolls with a sufficiently large roll diameter are prone to bow laterally or horizontally, even when loaded with a high contact force.

[0003] For the cold rolling of high-strength thin metal strips, however, work rolls with a large slenderness are required in order to be able to transmit large pressure forces to the high-strength thin metal strips without elastic roll flattening occurring. However, in order to be able to use also narrow or elongated work rolls in a rolling stand having four or six rolls and thus to configure this rolling stand in such a way that it is also suitable for rolling the high-strength thin metal strips described above, It is known in the prior art to horizontally support work rolls with high slenderness in the above-mentioned rolling stands; see for example unpublished German patent application no. 1020203076.6 for this purpose.

[0004] This patent describes the use of hydrostatic support shells for the work rolls, instead of the traditional chocks that would otherwise be used with the standard work rolls. Also disclosed is the integration of the small work roll with a second intermediate roll in the form of a cassette for insertion between the roll stand frames of one roll stand.

[0005] The support shell known from the above mentioned US Pat. No. 5,999,633 is relatively narrow or elongated; And when the support shell is pressed horizontally against the work roll by the operating and driving pressure cylinders, Often they are not suitable to successfully counteract or prevent horizontal curvature of the work rolls or their self-amplifying curvature as a reaction to high rolling forces. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] German Patent Application No. 1020203076.6 Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a known cassette for at least one work roll in a rolling stand, a known rolling stand having this cassette, and a known method for pressing a pressing cylinder in this cassette, To improve a rolling mill so that horizontal curvature of an elongated work roll can be effectively prevented even when a high rolling force is applied. [Means for solving the problem]

[0008] This problem is solved in relation to the cassette by the subject matter of claim 1. Accordingly, the bending stiffness of the support bridge is greater than the bending stiffness of the pressing mechanism in its coupled state with the long side of the cassette basic body which accommodates the pressing mechanism. Effect of the Invention

[0009] In other words: Even if the support shell or bridge is supported on the long sides of the cassette by two pressure contact mechanisms located at a larger distance from each other, It is proposed to design the support shell or the support bridge itself which carries the support shell so rigidly that the support shell does not yield to the large horizontal forces also acting on the support shell from the work rolls, or does not bend by itself, or only bends very slightly. Due to the claimed high bending stiffness of the support bridge as a support for the support shell, bending of this support shell is prevented even under the action of equally high horizontal forces by the work rolls, even if both pressure mechanisms carrying the support bridge with the support shell are eccentrically spaced widely apart from one another.

[0010] The key feature to make all the support mechanisms integrable into the cassette is the rigid transfer to the support bridge. The flexibility of the crimping device is deliberately accepted and is fully compensated for by suitable adjustment techniques.

[0011] According to a first embodiment, for the pressing of the support bridge with the support shell against the work roll, the pressing mechanism comprises at least one pressing cylinder.

[0012] According to a second embodiment, at least one toggle link is provided for the pivotal attachment of the support bridge with the support shell to one of the long sides of the cassette basic body. This is done via a first link arm of a toggle link, which with its end remote from the toggle joint is pivotally connected in an articulable manner to the long side of the cassette basic body, and the second link arm of the toggle link is formed by the support bridge itself, both link arms being articulably connected to each other via a toggle joint. The pressure cylinder is pivoted at one of the two link arms or at the toggle joint of the toggle link for operative connection with the toggle link and is supported with its other end on a long side of the cassette basic body. For this purpose, the pressure cylinder is advantageously pivoted vertically or at least with a vertical component on the long side of the cassette basic body. In this positional relationship, the pressure mechanism is formed by the toggle joint, the first link arm and the pressure cylinder. The second link arm of the toggle joint in the form of a support bridge therefore no longer belongs to the pressing mechanism, since it is used for pivoting the support bridge to the long side of the cassette basic body and for pressing it against the surface of the work roll. Essentially, the formation of the pressing mechanism in the form of a toggle link, at least in combination with the vertically pressed pressing cylinder, provides the advantage that the cassette can be held elongated in its lateral dimensions, in particular so elongated that it can be inserted into the roll stand frame window of a rolling stand in place of the conventional work roll chocks.

[0013] According to yet another embodiment, position detectors and / or force sensors are assigned to or integrated into the pressing cylinders for direct or indirect detection of the respective pressing position of the support shell against the work roll, the force sensors being used to detect the pressing forces by which the support shell is pressed against the work roll, typically via a thin film of cooling lubricant.

[0014] According to yet another embodiment, due to the action of the support shells on the opposing areas of the surface of the work roll, A respective supporting bridge with a supporting shell is pivotally attached to each of the two oppositely located long sides of the cassette basic body. The pivoting of the two support bridges to the oppositely located long sides of the cassette basic body is advantageously effected respectively via the two aforementioned pressure mechanisms.

[0015] According to yet another embodiment, above or below the work roll, an intermediate or backup roll is likewise rotatably supported on opposite short sides of the cutout in the cassette basic body. It is possible for the support bridge and the support shell to be formed as one piece. It is possible for the cassette to be configured as an exchange cassette for a rolling stand in order to insert it into or extract it from receptacles for the chocks of the older work rolls having a larger diameter in the rolling stand frames of the rolling stand.

[0016] With regard to the rolling stand, the above-mentioned object of the present invention is achieved by the subject matter of claim 11. Accordingly, the rolling stand according to the invention comprises: at least one cassette according to any one of claims 1 to 10; The work rolls are characterized in that they are rotatably supported on the short sides of the cassette basic body.

[0017] It is possible that the cassette according to the invention is rigidly installed in the roll stand between both roll stand frames, or For inserting the work rolls into and removing them from the receptacles for the chocks in the rolling stand frames, it is possible for this cassette to be designed as an exchange cassette. It is possible that an upper cassette is provided in the rolling stand for accommodating the upper work rolls and preferably the upper intermediate rolls, and / or It is possible for a lower cassette to be provided for accommodating the lower work rolls of the rolling stand and preferably the lower intermediate rolls. Otherwise the advantages of the solution for the rolling stand correspond to those stated above for the cassettes.

[0018] With regard to the method according to the invention, the above mentioned problem is solved by the method as claimed in claim 15. The method according to the invention relates to the pressing of the pressing cylinders in at least one cassette according to any one of claims 1 to 10, which is integrated in a rolling stand according to any one of claims 11 to 14. The method according to the invention comprises, as an important method step, for initialization before the start of the rolling operation: It is intended that all pressing cylinders in the cassette, on the curved side and on the opposite side, are adjusted to initial target positions, each individually, pre-given for each of them, by appropriate changes in the pressure in the pressing cylinders. This initial target position then corresponds to a working point, and each of the pressing cylinders is therefore adjusted to its respective working point. Starting from this adjustment of the working point, the target positions of all pressing cylinders on the curved side are changed, in particular increased, until the pressing forces applied individually by the pressing cylinders on the curved side reach a respectively predetermined target preload force Fv, which is advantageously predetermined in a single way for all pressing cylinders on the curved side. The target position for the pressure cylinder on the interior of the cassette, on the side lying opposite the curved side, is not affected thereby.

[0019] By the method steps described so far, all pressing cylinders inside the cassette are accordingly adjusted to their intended target positions before the start of the rolling process.

[0020] During the rolling process, A differential force between the pressure cylinders arranged opposite each other in a pair inside the cassette is detected on the curved side and the side located opposite to it, and to a given predicted value for the differential force, This is adjusted by a suitable change in the target position of at least one of the respective associated, oppositely positioned pressing cylinders. In this way, the stability of the rolling process is continuously monitored and maintained.

[0021] Furthermore, by proper control of the pressing cylinders, each and every one within the cassette, throughout the rolling process, The possibility exists of varying the roll gap, adjusting the tilt position of the upper and lower work rolls relative to one another and / or of varying the roll gap profile as well.

[0022] Otherwise, the advantages of the method according to the invention correspond to those stated above for the cassette.

[0023] This specification is accompanied by seven figures. [Brief description of the drawings]

[0024] [Figure 1] 1A-1D are views of a rolling stand with a cassette according to the invention in two variants, each in a transverse section; [Diagram 2] FIG. 2 is a perspective view of a cassette according to the present invention. [Diagram 3] FIG. 2 is a longitudinal cross-sectional view of a cassette according to the invention; [Figure 4] FIG. 2 is a transverse cross-sectional view of a cassette according to the present invention; [Diagram 5] FIG. 2 shows a pressure mechanism according to the invention with a support bridge according to the invention as a carrier for the support shells on both sides of the work roll, on the one hand in an unloaded state and on the other hand in a state with a horizontal load. [Figure 6] FIG. 2 is a diagram of a position adjustment circuit according to the present invention. [Figure 7] FIG. 2 shows a setpoint calculation device with a process model for the forming-technical representation of a rolling process for the calculation of various position and force setpoints. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The invention will now be described in detail by way of example with reference to the figures mentioned above, in which like technical elements are designated with like reference numerals, in which:

[0026] 1 shows a schematic view of a rolling stand in the form of a number of rolls arranged vertically one above the other, each of which defines a rolling nip 10 for rolling a material, in particular a metal strip, which is not shown in FIG. In the rolling stand 50 shown in the left hand side drawing of FIG. 1, the upper work rolls 10 are supported in the horizontal direction by support shells 120. These support shells 120 are mounted on bending-resistant supports, so-called support bridges 130, and are pressed against the surface of the upper work rolls 10 by means of positioning cylinders 142 which press against these support bridges 130. The upper work roll 10 is supported vertically by the upper intermediate roll 20 . The upper intermediate roll 20, the upper work roll 10 and the support shell 120 with the support bridge 130 and the positioning cylinder 142 are assembled in a compact structural manner in the upper cassette 100-o.

[0027] The support shells 120 in particular press with their long sides against the surface of the upper work roll 10 not directly, but rather indirectly, via a thin film of cooling lubricant, for example hydraulic oil, which is also the meaning given in the present specification when it is casually said that one of the support shells presses or is pressed against the work roll. The supply of cooling lubricant into the lubrication gap between the work rolls and the support shells takes place through oil conduits 170 shown in FIG. 1, which are likewise connected to an oil pump P. In order to prevent the cooling lubricant from escaping from the gap between one of the support shells and the work rolls at the end sides of the support shells 120, shields, for example in the form of sheets, can be installed at both end sides of each support shell. The shields, at their edge portions facing the work roll, are preferably shaped complementarily to the surface of this work roll, and in order to effectively prevent the escape of the cooling lubricant, the shields can then, in particular during the rolling operation, with their preferably complementarily shaped edge portions - preferably via a sealing lip - directly on the surface of the work roll, outside the material to be rolled.

[0028] While the left-hand side illustration in FIG. 1 shows the use of an upper cassette 100-o having horizontal support for only the upper work roll, In the accompanying drawing on the right side of FIG. 1, it can be seen that a similarly constructed lower cassette 100-u can likewise be utilized for horizontal support of the lower work roll 10. Similarly, although not shown in FIG. 1, it goes without saying that the use of the above-described cassette solely for supporting the lower work roll is also theoretically possible.

[0029] FIG. 2 shows the cassette 100 known from FIG. Since the upper cassette 100-o and the lower cassette 100-u are basically configured identically or similarly in terms of the structural structure of the cassettes, no distinction will be made between them in the following, but rather, only the term cassette 100 will be used in general. It can be seen in Fig. 2 that the cassette 100 essentially consists of a cassette basic body 110 in which an elongated recess 112 is formed. The elongated recess 112 is delimited by two oppositely located short sides and two oppositely located long sides. The intermediate roll 20, which can be seen in Fig. 2, is rotatably supported on the oppositely located short sides. The cassette 100 is shaped with respect to its outer dimensions and with respect to the geometric shape of its end faces, in particular on the short sides, so that it can be inserted into the receptacles for the work roll chocks in the windows of the rolling stand frame.

[0030] Figure 3 shows the cassette 100 known from Figure 2 in a longitudinal section. Not only the intermediate roll 20 but also the work roll 10 can be seen, which is supported vertically by the backup roll 20 and rotatably mounted at the short side of the cutout 112.

[0031] FIG. 4 shows the above-described cassette 100 in transverse cross-section, similar to FIG. 1, but here in somewhat greater detail. It can be seen that the centres or axes of rotation of the work roll 10 and the backup roll 20 are precisely aligned. In particular, when the resulting vertical rolling forces are particularly high and the slenderness of the work rolls is large in comparison with the slenderness of the intermediate roll 20, an unstable or only approximately stable equilibrium state exists in this positional relationship and therefore the work roll 10 tends to bow slightly in the horizontal direction. To prevent such bending of the work roll 10, the work roll is supported horizontally at its sides by means of support shells 120. The support shells 120 are themselves respectively connected to carriers 130, which are pressed horizontally together with the connected support shells 120 against the surface of the work roll via a pressing mechanism. 4, the pressure mechanism is formed by a pressure cylinder 142, a toggle joint 144 and a first link arm 145, which together with the first link arm 145 and the carrier 130 as a second link arm form a toggle link 143. Both link arms, the first link arm 145 and the second link arm 130, are articulably connected to each other via the toggle joint 144 at their ends near the toggle joint of the first link arm and the second link arm. The first link arm 145, at its end remote from the toggle joint, is pivotally connected in an articulable manner to the long side of the cassette base body 110. The pressure cylinder 142 is integrated into or pivotally connected to the long side of the set base body 110 and is supported at least on one side by the long side. Finally, for the pressing of the support shell 120 against the surface of the work roll 10, at its other end this pressing cylinder 142 is operatively connected to a toggle link 143. By means of the toggle link 143, the essentially vertical movement of the position adjusting cylinder 142 is thereby redirected into a horizontal movement or pressing force for the support shell. For the realization of the above-mentioned operative connection between the toggle link and the pressure cylinder, it is basically possible for the pressure cylinder 142 to be articulably engaged at the toggle joint 144 as well as at one of the two link arms 145, 130. In the case at issue here, however, a pivoting of the pressure cylinder 142 directly at the toggle joint 144, as shown in FIG. 4, appears particularly advantageous. 4, it can further be seen that the pressure cylinder 142 is provided with a position detector 150 and / or a force sensor 160. The position detector 150 detects the position si of the pressure cylinder 142, where 1≦i≦l, where l is a natural number.

number

[0032] The support shells 120 are typically attached to the support bridge; and it is possible, however, that they are formed in one piece with the support bridge as well. It is essential according to the invention that the support bridge 130 has a bending stiffness which is greater than the bending stiffness of the pressure contact mechanism 140 which is in connection with the long side of the cassette basic body which contains or supports it. In other words, the support bridge must be so bending-resistant that it does not succumb to the bending of the work roll in the horizontal direction, i.e. it does not bend, especially on its own, even under the load of horizontal forces on the work roll. The necessary force for the counter-holding of the support shell with the support bridge against the support shell, which has a tendency to bend, must be accommodated by the toggle link 143 and the pressure cylinder, as well as by the long side of the cassette basic body which accommodates or supports this pressure cylinder.

[0033] 5 shows a horizontal section of the cassette 100, installed in a rolling stand. It can be seen that the support shell together with the support bridge 130 advantageously extends over the entire length of the work roll 10, at least, but over a large part of this work roll. It can further be seen that, for pressing the support bridge 130 and the support shell in the horizontal direction against the work roll 10, preferably two pressing mechanisms are provided per support bridge and support shell 120, i.e. four pressing mechanisms per cassette. These can also in the simplest case be formed in the form of a pressing cylinder 142 in each case - without toggle links - which, as shown in FIG. 5, presses the support bridge 130 in the horizontal direction against the work roll 10, with support against the long sides of the cassette basic body. This structural arrangement, however, has the disadvantage that it is relatively wide, i.e. requires a large amount of space in the width direction. In particular therefore, instead of the above, an arrangement according to the embodiment shown in Fig. 4 can be advantageously used, in which the pressure cylinder does not extend in the horizontal direction but is rather mounted vertically and in that case presses against the support bridge 130 via the toggle link 143 shown. Therefore, the embodiment of the pressing mechanism shown in FIG. 4 is configured more compactly in the width direction than the embodiment shown in FIG. 5 and therefore offers the advantage of allowing the desired insertion of the cassette into the receiving portion of the very narrow roll stand frame window of the roll stand.

[0034] 5 further illustrates the concepts "drive side" and "operating side." The drive side refers to the side where the drive for the work rolls is typically located, and the operating side refers to the side without the drive, from which roll changing typically occurs. The left hand side view in Fig. 5 shows the cassette or rolling stand 50 in an unloaded state, i.e. without any particular horizontal force acting on the work rolls, whereas the right hand side view in Fig. 5 shows a horizontally loaded state. The actual vertically acting rolling forces, in the case of a slightly asymmetrical vertical support of the intermediate roll 20 and the work roll 10, sometimes give rise to horizontal forces which, in particular also in the case of a high slenderness of the work roll 10, cause a horizontal curvature of the work roll 10, as shown in the appendix to the right of FIG. 5. Precisely, in order to prevent this horizontal bending, the present invention contemplates forming the support bridge 130 with a bending stiffness greater than the bending stiffness of at least one of the pressure contact mechanisms in its combined state with the long side of the cassette basic body 110, which houses the pressure contact mechanism, as described above.

[0035] A method according to the invention for crimping the crimping cylinder 142 in the cassette 100 will now be described.

[0036] Prior to the rolling operation, the following steps are carried out: Identifying the curved side as the long side of the cassette base body 110, toward which the horizontal curvature of the work roll 10 is predicted; and by a suitable change in the pressure in the pressing cylinders, respectively individually to a predetermined initial target position s1soll...s4soll for each pressing cylinder of the pressing cylinders 142, Adjustment of all the pressing cylinders 142 in the cassette 100 on the curved side and on the opposite side; Step 3 starts. This regulation corresponds to a kind of working point regulation. A corresponding control circuit is diagrammatically illustrated in FIG.

[0037] Similarly, before the rolling operation has commenced, then The target positions of all the pressing cylinders 142 on the curved side are - typically starting from the initial target positions - The pressing force exerted individually by each pressing cylinder 142 on the curved side 120 is varied, in particular increased, until a respectively - advantageously single - predetermined target preload force Fv is reached.

[0038] During the rolling process, first of all, The pressure force differences F3-F1, F4-F2 of at least one oppositely disposed pair of the pressure cylinders against the oppositely located support shell are detected. A differential adjustment to a pre-given predicted value for the differential force is subsequently performed by appropriate change of the target position S3, S1; S4, S2 of at least one of the engaged oppositely located compression cylinders. The lower bending resistance of the crimping mechanism 140 compared to the prior art is at least partially compensated for by this adjustment.

[0039] The above-mentioned initial target position values ​​s1soll...s4soll for the pressure cylinder, the target value for the preload force Fv and / or the target value for the predicted value for the differential force ΔF are The following input quantities: Pre-calculated rolling force, Pre-calculated rolling torque, a pre-calculated strip tension of the material to be rolled by the rolling stand; the geometric shape of the support shell 120; a wear state of the support shell; Roll diameter, a target value for the fluid pressure p between the support shell 120 and the work roll; , . . . are calculated using a process model based on at least one input quantity; see FIG.

[0040] In the following, a special operating method for a rolling stand is described, starting from the fact that an upper cassette 100-o and a lower cassette 100-u according to the invention are installed in the rolling stand. Each of the two cassettes is equipped with an operating and a drive-side pressure cylinder, respectively on the curved side and on the non-curved side. At least the non-curved side pressure cylinder 142 is adjusted with an initial initial target position s1soll...s4soll of this pressure cylinder as a working point.

[0041] In order to realize the widening or narrowing of the rolling roll gap defined by the work rolls 10, The target positions of all the pressing cylinders 142 of both cassettes 100-o, 100-u on the non-curved side are advantageously increased or decreased by the same amount with respect to the initial target positions of these pressing cylinders.

[0042] To realize the inclined positions of the upper and lower work rolls relative to each other, The target positions of the pressure cylinders 142 on the operating sides of the upper and lower cassettes - respectively on the non-curved sides - are changed relative to the pressure cylinders 142 on the drive sides of the upper and lower cassettes - respectively on the non-curved sides. For example, the target positions of the pressure cylinders 142 on both the operating sides of the upper and lower cassettes - respectively on the non-curved side - are changed by +Δs. Advantageously, then the target positions of the pressure cylinders 142 on the drive sides of both the upper and lower cassettes - respectively on the non-curved side - are changed by -Δs.

[0043] In order to realize the change in the profile of the roll gap defined by the work rolls, on the one hand, the target positions of the pressing cylinders on the operating side of the upper cassette and of the pressing cylinders on the drive side of the lower cassette are each increased or decreased, preferably by the same amount, on the non-curved side, respectively, relative to their initial target positions. On the other hand, the target positions of the pressing cylinder on the drive side of the upper cassette and the pressing cylinder on the operating side of the lower cassette are each reduced or increased, preferably by the same amount, on the non-curved side, respectively, relative to their initial target positions.

[0044] The variation Δs is a position adjustment, which can be predefined by a thickness adjustment system or a flatness adjustment system, for example in combination with a strip thickness measuring device or a flatness measuring roller. In comparison with a main position adjustment with a larger hysteresis, a more direct treatment in the vicinity of the metal strip is advantageous. [Explanation of symbols]

[0045] 10 Work roll 20 Backup or intermediate rolls 50 Rolling Stand 100 cassettes 100-o Upper Cassette 100-u Lower Cassette 110 Cassette base body 112 Vertically elongated notch in cassette base body 120 Support Shell 130 Support bridge, second link arm 140 Pressure Welding Mechanism 142 Pressure Cylinder 143 Toggle Link 144 Toggle joint 145 First link arm 150 Position detector 160 Force Sensor 170 Oil conduit F Pressure force against the work roll (= rolling force) F, Fi Target pressure of the support shell against the work roll Soll-Fv target preload force p Fluid pressure target value si Target position of the support shell P-Pump

Claims

1. A cassette (100) for at least one work roll (10) in a rolling stand (50) for rolling a material, in particular a metal strip, comprising: This cassette is - has a cassette basic body (110) with a longitudinal cutout (112), the cutout is defined by two oppositely positioned short sides and two oppositely positioned long sides, the work roll being rotatably supported on the short sides; - has at least one supporting shell (120); - at least one support bridge (130) supported in the cassette basic body as a support for the support shell (120); and - at least one pressing mechanism (140) for articulable connection of the support bridge to one of the long sides of the cassette basic body and for pressing the support shell with a horizontal pressing force against the surface of the work roll; In the cassette (100), the bending stiffness of the support bridge (130) is greater than the bending stiffness of the pressure contact mechanism (140) in a coupled state with the long side of the cassette base body, which accommodates the pressure contact mechanism; A cassette (100).

2. For the pressing of the support bridge (130) with the support shell (120) against the work roll (10), 2. The cassette (100) of claim 1, wherein said crimping mechanism (140) comprises at least one crimping cylinder (142).

3. At least one toggle link (143) is provided; The toggle link has a toggle joint (144), a first link arm and a second link arm (130); both link arms are articulably coupled to each other at ends of the link arms proximate the toggle joint via a toggle joint; and the first link arm (145) is pivotally connected to the long side of the cassette base body (110) in an articulable manner at an end of the first link arm remote from a toggle joint; and the second link arm being formed by the support bridge (130); and The pressure cylinder (142) is incorporated into or pivotally attached to the long side of the cassette basic body (110); and in operative connection with said toggle link (143) for pressure application of said support bridge (130) with said support shell (120) against said work roll (10); and the toggle joint (144), the first link arm (145), and the pressure cylinder (142) form the pressure mechanism (140); 3. The cassette (100) of claim 2.

4. For the connection of the support bridge to the long side of the cassette basic body (110), 4. A cassette (100) according to any one of claims 1 to 3, characterized in that a plurality of, preferably two, pressure contact mechanisms (140) are provided along the longitudinal extension of the support bridge (130).

5. for direct or indirect detection of the respective pressing positions of said support shells (120) against said work rolls (10), 5. A cassette (100) according to any one of the preceding claims, characterized in that it is provided with at least one position detector (150,s), for example integrated in the pressing cylinder (142).

6. 6. A cassette (100) according to any one of claims 1 to 5, characterized in that at least one force sensor (160, F) is provided for detecting the pressure with which the support shell (120) is pressed against the work roll (10).

7. For pressing the support shells against the opposing areas of the surface of the work roll (10), For each of the two opposing long sides of the cassette basic body (110), Advantageously, each of said pressure contact mechanisms (140) is connected via two of said pressure contact mechanisms:

7. A cassette (100) according to claim 1, characterized in that each supporting bridge (130) with one supporting shell (120) is pivotally mounted.

8. An intermediate or backup roll (20) is provided for supporting the work roll (10), This intermediate roll or backup roll is 8. A cassette (100) as claimed in any one of claims 1 to 7, characterized in that it can be rotatably supported above or below the work roll (10), as well as on opposite short sides of the cutout portion (112).

9. 9. A cassette (100) according to any one of claims 1 to 8, characterized in that at least one of the support bridges (130) and at least one of the support shells (120) are each formed from a single member.

10. for inserting the work rolls into and withdrawing them from receptacles for the chocks in the roll stand frame of the roll stand, 10. The cassette (100) according to claim 1, characterized in that the cassette (100) is designed as a replacement cassette for a rolling stand (50).

11. A rolling stand (50), comprising: having one roll stand frame at the operating side and one roll stand frame at the drive side; and The rolling stand has at least one work roll (10) carried by the rolling stand frames, Comprising at least one cassette (100) according to any one of claims 1 to 10; A rolling stand (50) characterized in that the work rolls are rotatably supported on the short sides of the cassette basic body (110).

12. The work roll is supported by an intermediate roll (20).

12. The rolling stand (50) according to claim 11, characterized in that the intermediate rolls are rotatably supported above or below the work rolls as well as on the short sides of the cassette basic body (110).

13. the cassette (100) is rigidly mounted into the roll stand between both roll stand frames; or the cassette (100) is configured as an exchange cassette for inserting the work rolls into and extracting them from the receptacles for the chocks in the rolling stand frame, 13. A rolling stand (50) according to claim 11 or 12.

14. an upper cassette (100-o) is provided for accommodating the upper work rolls (10) and preferably the upper intermediate rolls (20) of the rolling stand; and / or a lower cassette (100-u) is provided for accommodating the lower work rolls (10) and preferably the lower intermediate rolls (20) of the rolling stand (50); 14. A rolling stand (50) according to any one of claims 11 to 13.

15. A method for pressing the pressing cylinders (142) in at least one cassette (100) according to any one of claims 1 to 10, which is installed in a rolling stand (50) according to any one of claims 11 to 14, comprising: The method comprises the following steps: Before the start of the rolling operation: Identification of the curved side as the long side of the cassette basic body (110), towards which horizontal curvature of the work roll (10) is predicted; and by a suitable change in the pressure in the pressing cylinders, respectively individually to a predetermined initial target position (s1soll...s4soll) for each pressing cylinder (142), Adjustment of all the pressing cylinders (142) in the cassette (100) on the curved side and on the opposite side; A method comprising the steps of:

16. The target positions of all the pressing cylinders (142) on the curved side are - typically starting from the initial target positions - the pressing force exerted individually by each of the pressing cylinders (142) on the curved side (120) against the work roll is varied, in particular increased, until a respectively - preferably a single - predetermined target preload force (Fv) is reached for all pressing cylinders on the curved side, 16. The method of claim 15 .

17. 17. The method of claim 15 or 16, In the above method, the pressing cylinder is disposed opposite the curved side and a non-curved side located opposite the curved side, During the rolling process, the following steps are carried out: Detecting the difference (F3-F1, F4-F2) of the pressing forces of at least one pair of the pressing cylinders arranged oppositely for oppositely located areas of the surface of the work roll; and - adjusting the differential force to a pre-given predicted value for the differential force by appropriate change of the target position (S3, S1; S4, S2) of at least one of the engaged opposing pressing cylinders, A method comprising the steps of:

18. The following input quantities: Pre-calculated rolling force, Pre-calculated rolling torque, a pre-calculated strip tension of the material to be rolled by the rolling stand; The geometric shape of the support shell (120); a wear state of the support shell; A roll diameter of the work roll; a target value for the fluid pressure (p) between the support shell (120) and the work roll; Based on at least one input quantity of a process model for the calculation of initial target position values ​​(s1soll...s4soll) for the pressure cylinder as initial quantities, a target value for the preload force (Fv) and / or a predicted value for the differential force (ΔF), 18. The method according to any one of claims 15 to 17.

19. To achieve the widening or narrowing of the rolling gap defined by the work rolls (10), the target positions of all the pressing cylinders (142) of the upper cassette (100-o) and the lower cassette (100-u) on the non-curved side are advantageously increased or decreased by the same amount, for example, with respect to the initial target positions of these pressing cylinders; 19. The method according to any one of claims 15 to 18.

20. 20. The method according to any one of claims 15 to 19, The method, wherein the upper and lower cassettes (100) are provided and equipped with operating and driving side pressure cylinders (142) at least on the non-curved side, To realize the inclined positions of the upper and lower work rolls relative to each other, Advantageously, for all said pressing cylinders (142), starting from an initial target position of said pressing cylinders: the target positions of the pressing cylinders (142) on the operating sides of the cassette - on the upper and lower - on the non-curved side respectively; - changed relative to the pressing cylinders (142) of the drive sides of the cassette - upper and lower - of the non-curved side respectively, A method comprising:

21. When the method is carried out by both cassettes, The pressing cylinders of the upper cassette and the lower cassette are advantageously respectively displaced by the same amount having the same sign, 21. The method according to any one of claims 15 to 20.

22. 22. The method of any one of claims 15 to 21, comprising: an upper cassette and a lower cassette each having an operating side pressure cylinder and a driving side pressure cylinder are provided on the curved side and the non-curved side; In the method, To realize a change in the profile of the rolling gap defined by the work rolls, the target positions of the pressing cylinders on the operating side of the upper cassette and of the pressing cylinders on the drive side of the lower cassette are respectively increased or decreased, preferably by the same amount, on the non-curved side with respect to their initial target positions; and, the target positions of the pressing cylinders on the drive side of the upper cassette and of the pressing cylinders on the operating side of the lower cassette are respectively reduced or increased, preferably by the same amount, on the non-curved side, respectively, with respect to their initial target positions, 22. The method according to any one of claims 15 to 21, characterized in that

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