Cassette for at least one work roll within 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 rolled materials. Furthermore, the present invention relates to a rolling stand having at least one such cassette, and to a method for pressing a pressing cylinder in such a cassette.

Background Art

[0002] The background of the present invention is a physical matter that in a conventional rolling stand having four or six rolls without horizontal support of the work roll, the allowable work roll diameter is limited downward. This limitation is given because only work rolls with a sufficiently large roll diameter do not tend to bend laterally or horizontally even under a load with a similarly high pressing force.

[0003] Regarding the cold rolling of high-strength thin metal strips, however, a work roll having a large aspect ratio is required in order to be able to transmit a large pressing force to the high-strength thin metal strip without elastic roll flattening occurring at that time. However, in order to be able to use similarly thin or slender work rolls in a rolling stand having four or six rolls, and accordingly, in order to form this rolling stand to be suitable for rolling high-strength thin metal strips as described above as well, In the prior art, it is known to horizontally support a work roll having a high aspect ratio in the rolling stand described above; for this purpose, for example, refer to the German Patent Application No. 1020203076.6 (Patent Document 1) which is not published.

[0004] This patent document 1 discloses not only the use of a hydrostatic support shell for a work roll, but also the integration of a small work roll and a second intermediate roll in the form of a cassette for insertion between the rolling stand pedestals of a rolling stand, instead of the conventional chucks with standard work rolls that would otherwise be used.

[0005] The support shell known from the above-mentioned patent document 1 is relatively thin or elongated; and thus, even when this support shell is pressed horizontally against the work roll by the nip cylinders on the operating side and the drive side, it is often not suitable for successfully canceling out the horizontal curvature of the work roll or preventing the self-amplifying curvature of this work roll as a reaction to a large rolling force.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The underlying problem of the present invention is to improve 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 the nip of nip cylinders in this cassette, such that the horizontal curvature of the elongated work roll is effectively prevented even during high rolling forces.

Means for Solving the Problems

[0008] This problem is solved by the subject matter of claim 1 with respect to the cassette. Accordingly, the bending rigidity of the support bridge is greater than the bending rigidity of the pressure contact mechanism, which is in a coupled state with the long side surface of the cassette base body that houses the pressure contact mechanism.

Advantages of the Invention

[0009] In other words: That is, the present invention Even if the support shell or the support bridge is supported on the long side surface of the cassette by two pressure contact mechanisms that are positioned relative to each other at a greater interval, It is proposed to form the support shell or the support bridge itself that carries this support shell to be rigid such that this support shell does not yield to a large horizontal force that is also applied from the work roll to this support shell, or does not bend itself, or bends only very slightly. Even when both pressure contact mechanisms that carry the support bridge having the support shell are widely spaced from each other eccentrically, based on the claimed large bending rigidity of the support bridge as a carrier for the support shell, the bending of this support shell is prevented even under the action of a similarly large horizontal force by the work roll.

[0010] An important feature for making it possible to incorporate all support mechanisms into the cassette is the transfer of rigidity to the support bridge. The bendability of the pressure contact device is intentionally tolerated and is sufficiently compensated by an appropriate adjustment method.

[0011] According to the first embodiment, for the pressure contact of the support bridge having the support shell against the work roll, the pressure contact mechanism has at least one pressure contact cylinder.

[0012] According to the second embodiment, at least one toggle link is provided for the pivoting of the support bridge having the support shell with respect to one of the long side surfaces within the long side surface of the cassette base body. This is done via the first link arm of the toggle link, and this first link arm is pivotally attached to the long side surface of the cassette base body in a joint-movable manner with an end far from the toggle joint of this first link arm. The second link arm of the toggle link is formed by the support bridge itself. Both link arms are joint-movably coupled to each other via a toggle joint. The pressing cylinder is pivotally attached 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 on the long side surface of the cassette base body with the other end of this pressing cylinder. For this purpose, the pressing cylinder is preferably pivotally attached to the long side surface of the cassette base body in the vertical direction or at least having a vertical component. In this positional relationship, the pressing mechanism is formed by the toggle joint, the first link arm, and the pressing cylinder. The second link arm of the toggle joint in the form of the support bridge no longer belongs to the pressing mechanism. This is because this second link arm is used for pivotally attaching the support bridge to the long side surface of the cassette base body and pressing against the surface of the work roll. Basically, the formation of the pressing mechanism in the form of a toggle link in a coupled state with a pressing cylinder that presses at least in the vertical direction provides the advantage that the cassette can be held elongated in the lateral dimension of this cassette, especially such that this cassette can be inserted into the rolling stand window of the rolling stand instead of the conventional work roll chock.

[0013] According to yet another embodiment, for the direct or indirect detection of the respective pressing positions of the support shells against the work roll, a position detector and / or a force sensor is assigned to or incorporated in the pressing cylinders. The force sensors are used for the detection of the pressing forces by which the support shells are typically pressed against the work roll via a thin film consisting of a cooling lubricant.

[0014] According to yet another embodiment, for the action of the support shell in the regions of the surface of the work roll that are opposite each other, One support bridge is pivotally mounted on each of the long side faces of both of the opposite long side faces of the cassette base body, each having one support shell. The pivotal mounting of both support bridges on the opposite long side faces of the cassette base body is advantageously effected via the two pressing mechanisms described above, respectively.

[0015] According to yet another embodiment, an intermediate roll or a backup roll is rotatably supported above or below the work roll, likewise, on the opposite short side faces of the notch in the cassette base body. It is possible that the support bridge and the support shell are formed as one piece. The cassette can be formed as an exchange cassette for the rolling stand for insertion into or withdrawal from the receiving portion for the chucks of the conventional work roll having a larger diameter within the rolling stand pedestal (Walzenstaendern) of the rolling stand.

[0016] With regard to the rolling stand, the above-described problem of the present invention is solved by the subject matter of claim 11. Accordingly, a rolling stand according to the present invention has at least one cassette) according to any one of claims 1 to 10; The work roll is characterized in that it is rotatably supported on the short side surface of the cassette base body.

[0017] It is possible for the cassette according to the invention to be firmly incorporated into the rolling stand between both of the rolling stand pedestals (Walzenstaender), or for insertion of the work roll into the receiving part for the chuck of the work roll in the rolling stand pedestals (Walzgerueststaendern), or for pulling out from these receiving parts, this cassette can be formed as an exchange cassette. It is possible to provide an upper cassette in the rolling stand for accommodation of the upper work roll and preferably also the upper intermediate roll, and / or It is possible to provide a lower cassette for accommodation of the lower work roll of the rolling stand and preferably also the lower intermediate roll. In other respects, the advantages of the solution for the rolling stand correspond to the above-mentioned advantages described with respect to the cassette.

[0018] Regarding the method according to the invention, the above-mentioned problem is solved by the method 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 incorporated in the rolling stand according to any one of claims 11 to 14. The method according to the invention, as an important method step, for initialization before the start of the rolling operation, intends that all the pressing cylinders in the cassette on the curved side and on the side located opposite thereto are adjusted to their respective initial target positions given in advance for each of these pressing cylinders by appropriate changes in the pressure in the pressing cylinders. At that time, this initial target position corresponds to the working point. Each of these welding cylinders is accordingly adjusted to the respective working point of this welding cylinder. Starting from this adjustment of the working point, the target positions of all the welding cylinders on the curved side are changed, in particular increased, by the respective welding cylinders on the curved side until the respective applied welding force reaches one pre-given target preloading force Fv. This target preloading force is preferably pre-given singly for all the welding cylinders on the curved side. The target position for the welding cylinder on the side located opposite to the curved side inside the cassette is not affected thereby.

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

[0020] Throughout the rolling operation, the differential force of the welding forces of the welding cylinders arranged opposite to each other in a paired state inside the cassette is detected on the side located opposite to the curved side, and is adjusted to a pre-given predicted value for the differential force by appropriate changes in the target positions of at least one of the welding cylinders located opposite to each other involved therein. In this way, the stability of the rolling process is continuously monitored and maintained.

[0021] Furthermore, throughout the rolling process, by appropriate control of the welding cylinders in the cassette respectively, there is a possibility of changing the rolling roll gap, adjusting the inclination states of the upper and lower work rolls relative to each other, and / or similarly changing the profile of the rolling roll gap.

[0022] In other respects, the advantages of this method according to the invention correspond to the above-mentioned advantages described with respect to the cassette.

[0023] Seven figures are attached to this specification.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments of the Invention

[0025] The present invention will be described in detail below in connection with the above-described figures in the manner of examples. In all the figures, the same technical elements are denoted by the same reference numerals.

[0026] FIG. 1 shows a schematic view of a rolling stand in the form of a plurality of rolls arranged vertically overlapping each other. The work rolls 10 each define a rolling roll gap for the rolling of a rolling material, in particular a metal strip, not shown in FIG. 1. In the rolling stand 50 shown in the left-hand subfigure of FIG. 1, the upper work roll 10 is supported horizontally by the support shell 120. These support shells 120 are assembled on a carrier formed with bending resistance, a so-called support bridge 130, and are pressed against the surface of the upper work roll 10 using a position adjustment cylinder 142 that presses 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 having the support bridge 130 and the position adjustment cylinder 142 are assembled in the upper cassette 100-o in a compact structural style.

[0027] The support shell 120 presses, in particular, not directly against the surface of the upper work roll 10, but rather indirectly through a thin film consisting of a cooling lubricant, for example hydraulic oil, by the long side surfaces of these support shells. This significance also means, in the same way, in this specification of the present application, when the words that one of these support shells presses against, or is pressed against, the work roll are used casually. The supply of the cooling lubricant into the lubrication gap between the work roll and the support shell is carried out through the oil conduits 170 shown in FIG. 1, and these oil conduits 170 are also connected to the oil pump P. In order to prevent the cooling lubricant from flowing out of the gap between one of the support shells inside the support shell and the work roll at the end side surfaces of the support shell 120, it is possible that shielding bodies, for example in the form of thin plates, are assembled at both end side surfaces of each support shell. These shielding bodies are preferably shaped complementary to the surface of the work roll at the edge portion of these shielding bodies facing the work roll. In order to effectively prevent the outflow of the cooling lubricant, in that case, these shielding bodies can be brought into contact directly on the surface of the work roll outside the rolling material to be rolled, preferably via a sealing lip, by means of the preferably complementary shaped edge portions of these shielding bodies, especially throughout the rolling operation.

[0028] Whereas the left-hand subfigure in FIG. 1 shows the use of the upper cassette 100-o having a horizontal support only for the upper work roll, It is recognizable that in the right-hand subfigure of FIG. 1, the similarly configured lower cassette 100-u can likewise be used for the horizontal support of the lower work roll 10. Although not shown in FIG. 1, it goes without saying that the use of the above-described cassette solely for the support of the lower work roll is likewise theoretically possible.

[0029] FIG. 2 shows a cassette 100 known from FIG. 1. Since the upper cassette 100-o and the lower cassette 100-u are basically the same or similarly configured in terms of the structural structure of this cassette, hereinafter, instead of distinguishing between them any further, rather, only the term cassette 100 will be used generally. In FIG. 2, it is recognizable that the cassette 100 basically consists of a cassette base body 110, in which a longitudinally extending notch 112 is formed. The longitudinally extending notch 112 is defined by two opposing short side faces and two opposing long side faces. The intermediate roll 20 recognizable in FIG. 2 is rotatably supported on the opposing short side faces. Cassette 100 is shaped such that it can be inserted into the receiving portion for the work roll chock within the window of the rolling stand frame with respect to the outer dimensions of this cassette, and in particular with respect to the geometric shape of the end face side of this cassette on the short side face.

[0030] Figure 3 shows the known cassette 100 from Figure 2 in a longitudinal cross-section. Not only the intermediate roll 20 but also the work roll 10 is recognizable, and this work roll is supported vertically by this backup roll 20 and is rotatably supported on the short side face of the notch 112.

[0031] Figure 4 shows the above-described cassette 100, similar to Figure 1, but here in a somewhat more detailed and faithful manner, in a transverse cross-section. It can be recognized that the center points or axes of rotation of the work roll 10 and the backup roll 20 are precisely aligned. In particular, when the resulting vertical rolling force is particularly large and the slenderness ratio of the work roll is large in comparison to that of the intermediate roll 20, in this positional relationship, an unstable or only approximately stable equilibrium state exists, and thus the work roll 10 has a tendency to bend slightly in the horizontal direction. To prevent such bending of the work roll 10, this work roll is supported horizontally on the side using a support shell 120. The support shells 120 are each coupled to a carrier 130 on their own, and this carrier, together with the coupled support shells 120 via a pressing mechanism, is pressed against the surface of the work roll in the horizontal direction. In the embodiment according to FIG. 4, the pressing mechanism is formed by a pressing cylinder 142, a toggle joint 144, and a first link arm 145. This toggle joint 144 forms a toggle link 143 together with the first link arm 145 and a carrier 130 as a second link arm. Both link arms of the first link arm 145 and the second link arm 130 are joined to each other via the toggle joint 144 in a manner that allows articulation at the ends near the toggle joint of these first and second link arms. The first link arm 145 is pivotally attached to the long side surface of the cassette base body 110 in a manner that allows articulation at the end of this first link arm far from the toggle joint. The pressing cylinder 142 is incorporated into the long side surface of the set base body 110 or pivotally attached to this long side surface, and at least on one side, it is supported by this long side surface. Ultimately, for the pressing of the support shell 120 against the surface of the work roll 10, with the other end of the pressing cylinder, this pressing cylinder 142 is operatively coupled to the toggle link 143. At this time, the substantially vertical movement of the position adjustment cylinder 142 is redirected, using the toggle link 143, into a horizontal movement or a pressing force for the support shell. For the realization of the above-described operative coupling between the toggle link and the pressing cylinder, it is possible for the pressing cylinder 142 to be operatively engaged in a manner that allows articulation at the toggle joint 144 as well, similar to in one of the two link arms 145, 130. However, in the particular case in question here, the direct pivotal attachment of the pressing cylinder 142 at the toggle joint 144 shown in FIG. 4 seems particularly advantageous. In FIG. 4, it can also be recognized that a position detector 150 and / or a force sensor 160 are attached to the pressing cylinder 142. The position detector 150 detects the position si of the pressing cylinder 142, where 1 ≦ i ≦ l, and here l is a natural number

Number

[0032] The support shell 120 is typically attached to the support bridge; however, it is also possible that these support shells are formed to consist of the support bridge and one member. According to the present invention, it is of great significance that the support bridge 130 has bending rigidity, and this bending rigidity is greater than the bending rigidity of the pressing mechanism 140 in a coupled state with the long side surface of the cassette base body that houses or supports the pressing mechanism. In other words, the support bridge needs to be bend-resistant enough so that it does not yield to the curvature of the work roll in the horizontal direction, that is, it does not bend by itself, especially under the load of the horizontal force on the work roll. The force required for the support bridge to resist and hold the support shell that tends to bend needs to be accommodated by the toggle link 143, the pressing cylinder, and the long side surface of the cassette base body that houses or supports this pressing cylinder.

[0033] Figure 5 shows a horizontal cross-sectional view of the cassette 100 incorporated in the rolling stand. It can be recognized that the support shell, together with the support bridge 130, advantageously extends over at least, but over most of the entire length of the work roll 10. Furthermore, it can be recognized that, in order to press the support bridge 130 and the support shell against the work roll 10 in the horizontal direction, advantageously two pressing mechanisms are provided for each support bridge and support shell 120, that is, four pressing mechanisms are provided for each cassette. In the simplest case, these pressing mechanisms can also be formed in the form of one pressing cylinder 142 each, - without toggle links - and, as shown in Figure 5, this pressing cylinder presses the support bridge 130 against the work roll 10 in the horizontal direction under the support against the long side surface of the cassette base body. However, this structural configuration has the disadvantage that this structural configuration is relatively wide, that is, it requires a large space in the width direction. Particularly for this reason, instead, a configuration according to the embodiment shown in Figure 4 can be advantageously handled, in which the pressing cylinder is not extended in the horizontal direction, but rather is incorporated in the vertical direction and, in that case, presses against the support bridge 130 via the shown toggle link 143. Therefore, the embodiment of the pressing mechanism shown in Figure 4 is configured more compactly in the width direction compared to the embodiment shown in Figure 5 and, therefore, provides the advantage of allowing the desired insertion of the cassette into the accommodation part of the exactly narrow rolling stand bench window of the rolling stand.

[0034] In Figure 5, furthermore, the conceptual "drive side" and "operation side" are specifically described. The drive side indicates the side where the drive device for the work roll is typically provided, and the operation side indicates the side without the drive device, from where roll change is typically performed. The left-hand illustration in FIG. 5 shows the cassette or rolling stand 50 in the unloaded state, i.e., in a state in which no horizontal force whatsoever is acting on the work roll. The right-hand illustration in FIG. 5, in contrast, shows the horizontal loading state. The original rolling force acting in the vertical direction, during the slightly asymmetrical vertical support of the intermediate roll 20 and the work roll 10, and in particular also in the case of the high slenderness ratio of the work roll 10, sometimes gives rise to a horizontal force that causes the work roll 10 to curve horizontally, as shown in the right-hand illustration in FIG. 5. Precisely in order to prevent this horizontal curvature, the invention is intended to form the support bridge 130 with a bending stiffness that is greater than the bending stiffness of at least one of the pressing mechanisms in the state of connection with the long side surface of the cassette base body 110 that houses the pressing mechanism, as described above.

[0035] A method according to the invention for the pressing of the pressing cylinders 142 in the cassette 100 will be described below.

[0036] Prior to the rolling operation, the following steps: namely, identification of the curved side as the long side surface of the cassette base body 110, towards which horizontal curvature of the work roll 10 is predicted; and, adjustment of all the pressing cylinders 142 in the cassette 100, on the curved side and on the side located opposite thereto, to the initially predefined target positions s1soll... s4soll, by means of a suitable change in the pressure in the pressing cylinders. are initiated. This adjustment corresponds to a kind of operating point adjustment. The corresponding control circuit is schematically illustrated in FIG. 6.

[0037] Similarly, even prior to the start of the rolling operation, then, On the bending side, the target positions of all the clamping cylinders 142 are - typically starting from the initial target position - while the clamping forces individually applied by the clamping cylinders 142 on the bending side 120 are each increased, particularly, until they each reach a single - preferably for all the clamping cylinders 142 on the bending side - pre - given target pre - load force Fv.

[0038] Throughout the rolling operation, first of all, differences in the clamping forces F3 - F1, F4 - F2 of at least one pair of the clamping cylinders arranged opposite each other with respect to the opposing support shells are detected. Subsequent adjustment of the differences to a pre - given predicted value for the differential force by appropriate changes in the target positions S3, S1; S4, S2 of at least one of the clamping cylinders involved among the clamping cylinders arranged opposite each other is carried out. The clamping mechanism 140 formed with lower bend resistance compared to the prior art is at least partially compensated by this adjustment.

[0039] The above - mentioned initial target position values s1soll... s4soll for the clamping cylinders, the target value for the pre - load force Fv, and / or the target value for the predicted value of the differential force ΔF are calculated using a process model based on at least one of the following input variables: namely, the pre - calculated rolling force, the pre - calculated rolling torque, the pre - calculated strip tension of the rolled material to be rolled by the rolling stand, the geometric shape of the support shell 120, the wear state of the support shell, the roll diameter, the target value for the fluid pressure p between the support shell 120 and the work roll; see Figure 7.

[0040] The following describes a special operating method for a rolling stand, starting from the fact that in this rolling stand, the upper cassette 100-o and the lower cassette 100-u according to the invention are incorporated. Each of the two cassettes is provided with nip cylinders on the operating side and the drive side, respectively, on the curved side and the non-curved side. At least the nip cylinder 142 on the non-curved side is adjusted at the initial target positions s1soll... s4soll of this nip cylinder as the working points.

[0041] For realizing the expansion or reduction of the rolling roll gap defined by the work roll 10, The target positions of all the nip cylinders 142 of both cassettes 100-o, 100-u on the non-curved side are increased or decreased, preferably by the same amount, with respect to the initial target positions of these nip cylinders.

[0042] For realizing the tilting states of the upper and lower work rolls relative to each other, - The target positions of the nip cylinders 142 on the operating side of the upper and lower cassettes, respectively, on the non-curved side are changed relative to the target positions of the nip cylinders 142 on the drive side of the upper and lower cassettes, respectively, on the non-curved side. For example, the target positions of both nip cylinders 142 on the operating side of the upper and lower cassettes, respectively, on the non-curved side are changed by +Δs. Preferably, then, the target positions of both nip cylinders 142 on the drive side of the upper and lower cassettes, respectively, on the non-curved side are changed by -Δs.

[0043] For realizing the change of the profile of the rolling roll gap defined by the work roll, on the one hand, the target positions of the nip cylinder on the operating side of the upper cassette and the nip cylinder on the drive side of the lower cassette are increased or decreased, preferably by the same amount, respectively, on the non-curved side, with respect to their initial target positions. On the other hand, the target positions of the pressing cylinder on the driving side of the upper cassette and the pressing cylinder on the operating side of the lower cassette are each on the non-curved side and are each advantageously reduced or increased by the same amount with respect to these initial target positions.

[0044] The amount of change Δs is the amount of position adjustment in each case. For example, in combination with a strip thickness measuring device or a flatness measuring roller, it is possible for these amounts of position adjustment to be given in advance by a thickness adjustment system or a flatness adjustment system. In comparison with the main position adjustment with greater hysteresis, a more direct treatment (Durchgriff) closer to the metal strip is advantageous. Note that although this application relates to the invention described in the claims, the following may also be included as other aspects. 1. A cassette (100) for at least one work roll (10) in a rolling stand (50) for rolling rolled materials, particularly metal strips, wherein this cassette - has a cassette base body (110) having a vertically long notch (112), this notch being defined by two short side faces located opposite each other and two long side faces located opposite each other, and the work roll being rotatably supported on these short side faces; - has at least one support shell (120); - has at least one support bridge (130) supported in the cassette base body as a carrier for the support shell (120); and, - has at least one pressing mechanism (140) for the articulatable connection of the support bridge to one of these long side faces of the cassette base body and for the pressing contact of the support shell by a horizontal pressing force against the surface of the work roll; In the above cassette (100), the bending rigidity of the support bridge (130) is greater than the bending rigidity of the pressing mechanism (140) in a state of connection with the long side face of the cassette base body that houses the pressing mechanism, characterized cassette (100). 2. For the pressing contact of the support bridge (130) having the support shell (120) against the work roll (10), the pressing mechanism (140) has at least one pressing cylinder (142), characterized by the cassette (100) according to 1 above. 3. At least one toggle link (143) is provided, this toggle link having a toggle joint (144) and a first link arm and a second link arm (130), both of these link arms being articulately connected to each other via the toggle joint at the ends of these link arms near the toggle joint; and, The first link arm (145) is pivotally attached to the long side surface of the cassette base body (110) with an end far from the toggle joint of the first link arm, such that it can perform articulating movement; and, the second link arm is formed by the support bridge (130); and, the pressing cylinder (142) is incorporated in or pivotally attached to the long side surface of the cassette base body (110), and, for pressing the support bridge (130) having the support shell (120) against the work roll (10), it is in an operative connection state with the toggle link (143); and, the pressing mechanism (140) is formed by the toggle joint (144), the first link arm (145), and the pressing cylinder (142). The cassette (100) according to 2 above, characterized in that. 4. For the connection of the support bridge to the long side surface of the cassette base body (110), The cassette (100) according to any one of 1 to 3 above, characterized in that a plurality of, preferably two, pressing mechanisms (140) are provided along the longitudinal extension of the support bridge (130). 5. For the direct or indirect detection of the respective pressing positions of the support shell (120) against the work roll (10), The cassette (100) according to any one of 1 to 4 above, characterized in that at least one position detector (150, s) incorporated, for example, in the pressing cylinder (142) is provided. 6. The cassette (100) according to any one of 1 to 5 above, characterized in that at least one force sensor (160, F) is provided for detecting the pressing force with which the support shell (120) is pressed against the work roll (10). 7. For the pressing of the support shell against the regions of the surface of the work roll (10) that face each other, for each of the opposite long side surfaces of the cassette base body (110), preferably, via two of the pressing mechanisms in each of the pressing mechanisms (140), The cassette (100) according to any one of the above 1 to 6, characterized in that one support bridge (130) is pivotally attached to each having one support shell (120). 8. For the support of the work roll (10), an intermediate roll or backup roll (20) is provided, this intermediate roll or backup roll, The cassette (100) according to any one of the above 1 to 7, characterized in that it can be rotatably supported above or below the work roll (10) and also on the opposite short side surfaces of the notch (112). 9. The cassette (100) according to any one of the above 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 of one member. 10. For insertion into or withdrawal from the housing for chocking the work roll within the rolling stand housing of the rolling stand, The cassette (100) according to any one of the above 1 to 9, characterized in that it is formed as an exchange cassette for the rolling stand (50). 11. A rolling stand (50), the rolling stand having, one rolling stand housing on the operating side and one rolling stand housing on the drive side; and at least one work roll (10) carried by these rolling stand housings, in the rolling stand, having at least one cassette (100) according to any one of the above 1 to 10; The rolling stand (50), characterized in that the work roll is rotatably supported on the short side surface of the cassette base body (110). 12. Having an intermediate roll (20) for supporting the work roll, The rolling stand (50) according to the above 11, characterized in that this intermediate roll is rotatably supported above or below the work roll and also on the short side surface of the cassette base body (110). 13. The cassette (100) is firmly incorporated into the rolling stand between both of the rolling stand housings; or For insertion of the chucks of the work rolls into the receiving portions for the chucks of the work rolls in the rolling stand housing, or for withdrawal from these receiving portions, the cassette (100) is formed as an exchange cassette. The rolling stand (50) according to claim 11 or 12, characterized in that. 14. An upper cassette (100-o) is provided for receiving the upper work roll (10) of the rolling stand, and preferably also the upper intermediate roll (20); and / or The rolling stand (50) according to any one of claims 11 to 13, characterized in that a lower cassette (100-u) is provided for receiving the lower work roll (10) of the rolling stand (50), and preferably also the lower intermediate roll (20). 15. In a method for pressing of the pressing cylinders (142) in at least one cassette (100) according to any one of claims 1 to 10 incorporated in the rolling stand (50) according to any one of claims 11 to 14, This method has the following steps: namely, Before the start of the rolling operation: Identifying the curved side as the long side of the cassette base body (110) where the horizontal curvature of the work roll (10) is predicted towards the long side; and, By appropriate changes in the pressure in the pressing cylinders, for each of the pressing cylinders (142) to the initially given initial target positions (s1soll... s4soll), Adjustment of all the pressing cylinders (142) in the cassette (100) on the curved side and on the side opposite thereto. A method characterized by having 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 - Each time the pressing force applied individually to the work roll by the pressing cylinder (142) on the curved side (120) reaches a single - preferably single for all the pressing cylinders on the curved side - pre - given target pre - load force (Fv), the target positions change, in particular increase. The method according to claim 15, characterized in that. 17. The method according to claim 15 or 16, wherein In the method in which the butt-welding cylinders are arranged opposite each other in a paired state on the curved side and the non-curved side located opposite thereto, During the rolling operation, the following steps: namely, Detection of the difference in the butt-welding force (F3 - F1, F4 - F2) of at least one pair of the butt-welding cylinders arranged opposite each other with respect to the regions of the surface of the work roll located opposite each other; and, Adjustment of the difference to a pre-given predicted value for the differential force by appropriate changes in the target positions (S3, S1; S4, S2) of at least one of the butt-welding cylinders among the butt-welding cylinders located opposite each other involved, A method characterized by having the steps of. 18. The following input quantities: namely, Pre-calculated rolling force, Pre-calculated rolling torque, Pre-calculated strip tension of the rolled material to be rolled by the rolling stand, Geometric shape of the support shell (120), Wear state of the support shell, Roll diameter of the work roll, Based on at least one of the input quantities of the target value for the fluid pressure (p) between the support shell (120) and the work roll, Having a process model for calculating the initial target position value (s1soll... s4soll) for the butt-welding cylinder, the target value for the preload force (Fv), and / or the predicted value for the differential force (ΔF) as initial quantities, The method according to any one of the above 15 to 17, characterized in that. 19. For realizing an increase or decrease in the rolling roll gap defined by the work roll (10), The target positions of all the butt-welding 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 butt-welding cylinders, The method according to any one of the above 15 to 18, characterized in that. 20. The method according to any one of the above 15 to 19, In the method in which the upper and lower cassettes (100) are each provided with and equipped with butt-welding cylinders (142) on the operation side and the drive side, at least on the non-curved side, For realizing the inclined positions of the upper and lower work rolls relative to each other, Advantageously, in all of the said welding cylinders (142), starting from the initial target positions of these welding cylinders, - for each of the upper and lower cassette operating-side welding cylinders (142) on the non-curved side thereof, the said target positions are - for each of the upper and lower cassette drive-side welding cylinders (142) on the non-curved side thereof, relatively changed, A method characterized by this. 21. When the said method is implemented by both of the said cassettes, The welding cylinders of the upper cassette and the lower cassette are advantageously each moved by the same amount having the same sign. The method according to any one of the above 15 to 20, characterized by this. 22. The method according to any one of the above 15 to 21, An upper cassette and a lower cassette each having one operating-side welding cylinder and one drive-side welding cylinder are provided on the curved side and the non-curved side. In the said method, For the realization of the change in the profile of the rolling roll gap defined by the said work roll, The target positions of the operating-side welding cylinder of the upper cassette and the drive-side welding cylinder of the lower cassette are each on the non-curved side, relative to their initial target positions, each advantageously increased or decreased by the same amount; And, The target positions of the drive-side welding cylinder of the upper cassette and the operating-side welding cylinder of the lower cassette are each on the non-curved side, each relative to their initial target positions, advantageously decreased or increased by the same amount, The method according to any one of the above 15 to 21 Characterized by this.

Explanation of Symbols

[0045] 10 work roll 20 backup roll or intermediate roll 50 Rolling Stand 100 Cassette 100-o Upper Cassette 100-u Lower Cassette 110 Cassette Base Body 112 Vertically Long Notch Portion in Cassette Base Body 120 Support Shell 130 Support Bridge, Second Link Arm 140 Pressing Mechanism 142 Pressing Cylinder 143 Toggle Link 144 Toggle Joint 145 First Link Arm 150 Position Detector 160 Force Sensor 170 Oil Conduit F Pressing Force on Work Roll (=Rolling Force) F, Fi Target Pressing Force of Support Shell on Work Roll Soll-Fv Target Preloading Force p Target Value of Fluid Pressure si Target Position of Support Shell P Pump

Claims

1. A cassette (100) for at least one work roll (10) within a rolling stand (50) for rolling a rolled material, i.e., a metal strip, wherein the cassette has - a cassette base body (110) having a vertically elongated notch (112), the notch being defined by two opposing short side faces and two opposing long side faces, and the work roll being rotatably supported at these short side faces; - at least one support shell (120) that horizontally sandwiches and supports the work roll (10); - at least one support bridge (130) supported within the cassette base body as a carrier for the support shell (120); and - at least one pressing mechanism (140) for the articulatable connection of the support bridge to one of these long side faces of the cassette base body and for the pressing contact of the support shell by a horizontal pressing force against the surface of the work roll; in the above cassette (100), even when both of the pressing mechanisms (140) carrying the support bridge (130) having the support shell (120) are eccentrically and widely spaced from each other, based on the large bending stiffness of the support bridge (130) as a carrier for the support shell (120), the bending of the support shell (120) is prevented to such an extent that it is not affected even under the action of a large horizontal force by the work roll (10), the bending stiffness of the support bridge (130) is greater than the bending stiffness of the pressing mechanism (140) in a state of being coupled to the long side face of the cassette base body that houses the pressing mechanism, and at least one toggle link (143) is provided, the toggle link having a toggle joint (144) and a first link arm and a second link arm (130), both of these link arms being articulately coupled to each other via the toggle joint at the ends of these link arms near the toggle joint; and The first link arm (145) is pivotally attached to the long side surface of the cassette base body (110) in a manner that allows articulation, with an end that is far from the toggle joint of the first link arm; and, The second link arm is formed by the support bridge (130); A cassette (100) characterized by the above.

2. For the purpose of pressing the support bridge (130) having the support shell (120) against the work roll (10), The pressing mechanism (140) has at least one pressing cylinder (142), and the cassette (100) according to claim 1 is characterized by this.

3. The pressing cylinder (142) is incorporated in the long side surface of the cassette base body (110) or pivotally attached to this long side surface, and For the purpose of pressing the support bridge (130) having the support shell (120) against the work roll (10), it is in a state of operative connection with the toggle link (143); and The pressing mechanism (140) is formed by the toggle joint (144), the first link arm (145), and the pressing cylinder (142), The cassette (100) according to claim 2 is characterized by this.

4. For the connection of the support bridge to the long side surface of the cassette base body (110), A plurality of or two pressing mechanisms (140) are provided along the longitudinal extension of the support bridge (130), and the cassette (100) according to any one of claims 1 to 3 is characterized by this.

5. For the direct or indirect detection of the respective pressing positions of the support shell (120) against the work roll (10), At least one position detector (150, s) incorporated in the pressing cylinder (142) is provided, and the cassette (100) according to any one of claims 1 to 4 is characterized by this.

6. At least one force sensor (160, F) is provided for detecting the pressing force with which the support shell (120) is pressed against the work roll (10), and the cassette (100) according to any one of claims 1 to 5 is characterized by this.

7. For pressing the support shell in the regions of the surface of the work roll (10) that are opposite to each other, With respect to each of the long side surfaces of both of the opposite long side surfaces of the cassette base body (110), Via two of the pressing mechanisms respectively within the pressing mechanism (140), The cassette (100) according to any one of claims 1 to 6, characterized in that one support bridge (130) is pivotally attached to each having one support shell (120).

8. An intermediate roll or backup roll (20) is provided for supporting the work roll (10), This intermediate roll or backup roll, The cassette (100) according to any one of claims 1 to 7, characterized in that it can be rotatably supported above or below the work roll (10), and similarly, on the short side surfaces of the notch (112) that are opposite to each other.

9. The 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 of one member.

10. For insertion into the accommodating portion for chucking the work roll within the rolling stand housing of the rolling stand, or for pulling out from these accommodating portions, The cassette (100) according to any one of claims 1 to 9, characterized in that it is formed as an exchange cassette for the rolling stand (50).

11. A rolling stand (50), this rolling stand having, One rolling stand housing on the operating side and one rolling stand housing on the drive side; and, In the rolling stand, having at least one work roll (10) carried by these rolling stand housings, Having at least one cassette (100) according to any one of claims 1 to 10; The rolling stand (50), characterized in that the work roll is rotatably supported on the short side surface of the cassette base body (110).

12. Having an intermediate roll (20) for supporting the work roll, The rolling stand (50) according to claim 11, characterized in that this intermediate roll is rotatably supported above or below the work roll and, similarly, on the short side surface of the cassette base body (110).

13. The cassette (100) is firmly incorporated into the rolling stand between both of the rolling stand mounts; or The cassette (100) is formed as an exchange cassette for insertion into or withdrawal from a receiving portion for chocking the work roll in the rolling stand mount. The rolling stand (50) according to claim 11 or 12, characterized by the above.

14. An upper cassette (100-o) is provided for accommodating the upper work roll (10) and the upper intermediate roll (20) of the rolling stand; and / or A lower cassette (100-u) is provided for accommodating the lower work roll (10) and the lower intermediate roll (20) of the rolling stand (50), the rolling stand (50) according to any one of claims 11 to 13, characterized by the above.

15. In a method for pressing of the pressing cylinder (142) in at least one cassette (100) according to any one of claims 1 to 10 incorporated in the rolling stand (50) according to any one of claims 11 to 14, this method has the following steps: namely, Before the start of the rolling operation: Identification of the curved side as the long side surface of the cassette base body (110) where a horizontal convex curvature of the work roll (10) is predicted towards the long side surface; and Adjustment of all the pressing cylinders (142) in the cassette (100) on the curved side and on the side opposite thereto to the initially given target positions (s1 soll... s4 soll) for each of the respective pressing cylinders by appropriate changes in the pressure in the pressing cylinders. The method is characterized by having the step of. The target positions of all the pressing cylinders (142) on the curved side start from - the initial target positions -

16. ​ By means of the respective press cylinders (142) on the curved side (120), the pressing force individually applied to the work roll changes or increases until the pressing force for each reaches a single, pre-given target preloading force (Fv) for all the press cylinders on the curved side. The method according to claim 15, characterized in that.

17. The method according to claim 16, wherein in the method in which the press cylinders are arranged opposite each other in a paired state on the curved side and the non-curved side located opposite thereto, during the entire rolling operation, the following steps: namely, detecting the difference in the pressing force (F3 - F1, F4 - F2) of at least one pair of the press cylinders arranged opposite each other with respect to the regions of the surface of the work roll located opposite each other; and adjusting the difference to a pre-given predicted value for the differential force by appropriately changing the target positions (S3, S1; S4, S2) of at least one of the press cylinders among the press cylinders arranged opposite each other involved, characterized in that the method has the steps.

18. The following input quantities: namely, the pre-calculated rolling force, the pre-calculated rolling torque, the pre-calculated strip tension of the rolled material to be rolled by the rolling stand, the geometric shape of the support shell (120), the wear state of the support shell, the roll diameter of the work roll, based on at least one of the input quantities of the target value for the fluid pressure (p) between the support shell (120) and the work roll, having a process model for calculating the initial target position values (s1 soll... s4 soll) for the press cylinders, the target value for the preloading force (Fv), and / or the predicted value for the differential force (ΔF) as initial quantities, The method according to any one of claims 15 to 17, characterized in that.

19. For realizing the expansion or reduction of the rolling roll gap defined by the work roll (10), the target positions of all the press cylinders (142) of the upper cassette (100 - o) and the lower cassette (100 - u) on the non-curved side are increased or decreased by the same amount with respect to the initial target positions of these press cylinders. The method according to claim 17, characterized in that.

20. The method according to claim 17, wherein the upper and lower cassettes (100) each are provided with and equipped with a pressure contact cylinder (142) on at least the non-curved side between an operation side and a drive side, in the method, the target positions of the pressure contact cylinders (142) on both the operation sides of the upper and lower cassettes on the non-curved side are each changed by an amount of change +Δs, then, the target positions of the pressure contact cylinders (142) on both the drive sides of the upper and lower cassettes on the non-curved side are each changed by an amount of change -Δs, in such a manner that for realizing the inclined states of the upper and lower work rolls relative to each other, in all of the pressure contact cylinders (142), starting from the initial target positions of these pressure contact cylinders, - for each of the non-curved sides - the target positions of the pressure contact cylinders (142) on the operation sides of the upper and lower cassettes - for each of the non-curved sides - are changed relative to the target positions of the pressure contact cylinders (142) on the drive sides of the upper and lower cassettes, the method being characterized in that.

21. When the method is implemented by both of the cassettes, the pressure contact cylinders of the upper cassette and the lower cassette are each moved by the same amount having the same sign, the method according to any one of claims 15 to 20, characterized in that.

22. The method according to claim 17, wherein an upper cassette and a lower cassette each having one pressure contact cylinder on an operation side and a pressure contact cylinder on a drive side are provided on the curved side and the non-curved side, in the method, for realizing a change in the profile of the rolling roll gap defined by the work roll, the target positions of the pressure contact cylinder on the operation side of the upper cassette and the pressure contact cylinder on the drive side of the lower cassette are each increased or decreased by the same amount relative to their initial target positions on the non-curved side; and the target positions of the pressure contact cylinder on the drive side of the upper cassette and the pressure contact cylinder on the operation side of the lower cassette are each decreased or increased by the same amount relative to their initial target positions on the non-curved side, the method being characterized in that.

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