Method and equipment for hot rolling of a rolled metal product

Abstract

The invention relates to a method for hot rolling of metallic strips with the use of multiple rolling mills arranged in a rolling line, which method comprises the provision of a semi-finished product having a thickness of 150 mm or more as strip, which is rolled in the rolling line from an initial large initial pass cross-sectional area with progressive thickness reductions to a comparatively smaller target cross-sectional area, in which the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area is achieved exclusively by a single rolling mill or by a number of identical rolling mills of the type of a single rolling stand. The invention further relates to a hot rolling installation for the implementation of this method.

Description

Technical Field

[0001] The present invention relates to a method for hot rolling a metallic rolled material under the use of at least one rolling device, wherein the method includes the preparation of a semi-finished product having a thickness of 150 mm or more as the rolled material, and the rolled material is rolled from an initially large initial pass cross-sectional area to a relatively smaller target cross-sectional area under progressive thickness reduction.

Background Art

[0002] In the prior art, flat or plate-shaped metal plates are often produced by hot rolling from continuously cast slabs having a relatively large initial thickness or a large initial cross-sectional area. During the production of metal plates, various process steps are necessary for shaping, but also for achieving the mechanical and industrial-technical properties of the metal plates. In a rolling mill, first of all, the slab as the raw material is heated and rolled into a sheet metal panel. For a final rolling thickness of up to about 200 mm, slabs having a thickness typically from 300 to 500 mm are used in that case. In most cases, continuously cast slabs are rolled, and these continuously cast slabs are provided from a pre-arranged steelworks or are additionally purchased. Optionally, the slabs are rolled from cast ingots having a thickness of up to about 1000 mm.

[0003] Based on the requirements for rolling ingots or slabs having a high initial thickness, for example for the production of thick metal plates, these ingots or slabs are first subjected to an initial thickness reduction in a so-called rough rolling stand. The rough rolling stands are usually configured to be able to roll a larger initial pass cross-sectional area of the rolled material. It is possible that these rough rolling stands are arranged within a group of rough rolling stands in one rolling line and are prepared such that a large roll-up process of the work rolls is ensured. In subsequent manufacturing steps, the slab is rolled down to the desired target thickness in a so-called finishing rolling stand. In doing so, the task of ensuring the thickness tolerance required for the finished product and the desired flatness by means of appropriate measures for adjusting the thickness and profile of the roll gap is imposed on the finishing rolling stand.

[0004] The structure of such a rolling line includes the provision of at least two different rolling mills having different rolling stand types. The investment costs for such a prepared production line / rolling line are high. Relatively high labor is required for maintenance and servicing.

[0005] In order to maintain the desired temperature range for the deformation process, it is necessary to heat the rolled material between them according to the number and spacing of the roughing stand and the finishing rolling stand relative to each other. This results in a high energy consumption.

[0006] In order to improve the productivity of the rolling line, it is basically desirable to process semi-finished products having the largest possible initial pass cross-sectional area. For this purpose, for example, in Patent Document 1, one method has been proposed, in which the heated rolled material is rolled down from a pusher furnace in the extension of the rolling line on the side facing away from the rolling line into the initial pass cross-sectional area of a continuous or semi-continuous rolling line in a reversible pass, and is initially passed in the first rolling stand of the rolling line under the guidance of through-pass through this pusher furnace.

[0007] A rolling stand having a work roll-bending system and a high upward process of the work roll with a moving system is basically known from the prior art, for example from Patent Document 2. The method according to the generic concept of claim 1 is known, for example, from Patent Document 3. Yet another prior art is known from Patent Documents 4, 5, 6, 7, 8, 9.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Patent Document 9

Summary of the Invention

Problems to be Solved by the Invention

[0009] The underlying problem of the present invention is to provide an economical rolling method for the production of metal sheets, which is characterized by low investment costs during procurement, as well as low energy consumption and, consequently, reduced CO2 emissions.

Means for Solving the Problems

[0010] The underlying problem of the present invention is solved by the features of claims 1 and 8. Advantageous embodiments of the present invention are given by the dependent claims.

Effects of the Invention

[0011] The aspect of the present invention relates to a method for hot rolling a metallic rolled material under the use of at least one rolling device, wherein the method includes the preparation of a semi-finished product having a thickness of 150 mm or more as the rolled material, wherein the rolled material is rolled in a rolling line from an initial large initial pass cross-sectional area to a relatively smaller target cross-sectional area under a progressive thickness reduction, wherein the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area, is achieved solely by a single rolling device or by a number of homogeneous rolling devices of a single rolling stand type.

[0012] The present invention can be summarized in that a semi-finished product having a large initial cross-sectional area and a large initial thickness according to the present invention is finish-rolled from the initial pass cross-sectional area or the initial pass thickness to the target thickness solely in a single rolling stand or exclusively within rolling stands of the same type, wherein, according to the present invention, no division of the rolling line into a roughing stand and a finishing stand is intended. Thereby, the investment costs for the rolling equipment can be clearly reduced. This is ensured in particular by the use of a rolling stand having a particularly high roll ascending process.

[0013] Advantageously, as the rolled material, a semi-finished product in the form of a slab having a thickness of 550 mm or more obtained by an ingot casting method or a continuous casting method is prepared.

[0014] Within the scope of the present invention, it is advantageous if the thickness reduction of the rolled material from the initial pass cross-sectional area to the target cross-sectional area is achieved at the sole heat of the rolled material, i.e., if all rolling passes are carried out within the desired temperature range without further heating of the rolled material.

[0015] An advantageous variant of the method according to the present invention is characteristically Comprising an axial movement and bending device for work rolls, and, more preferably, having roll camber, and particularly preferably having S-shaped grinding, and being constituted exclusively by the use of at least one pair of work rolls. By moving the work rolls in the reverse direction, the effect of a continuously variable profile of the rolling roll gap is obtained.

[0016] Thereby, a purposeful adjustment of the rolling roll gap profile can be carried out within one rolling line from the first rolling stand to the last rolling stand, or from the first rolling device to the last rolling device. Thereby, a higher pass thickness reduction rate or thickness reduction is achieved, which overall reduces the number of rolling devices required within the rolling line.

[0017] Advantageously, this method is characterized by the use of a rolling device having a maximum roll lift of at least 900 mm, preferably at least 1000 mm.

[0018] For the rolling of thick metal sheets, particularly those having a final rolling thickness of 150 mm and above, a high initial thickness of the rolled material is required. This is because, for good core properties of this metal sheet, the ratio of the initial thickness to the final rolling thickness should not fall below a predetermined ratio. Therefore, when the method according to the invention is intended such that the ratio (degree of deformation) of the initial thickness of the cross-sectional area of the rolled material to the target thickness of the target cross-sectional area of the rolled material is between 2 and 3, preferably between 2 and 5, it is advantageous.

[0019] According to the invention, this method includes a method carried out by using at least one upper and lower work roll, and at least one upper and lower backup roll, wherein the work roll and the backup roll are supported within a common rolling stand. The work rolls are adjustable relative to each other for adjusting a preset rolling roll gap. Each of the work rolls is operatively coupled to at least one bending device. One first bending device is assigned to the upper work roll and one second bending device is assigned to the lower work roll. The second bending device comprises bending cylinders. These bending cylinders are arranged in a vertically fixed position and the upper work roll is adjustable or drivable in the vertical direction for adjusting the height of the rolling roll gap between rolling passes using the first bending device. Post-adjustment is adjustable or drivable. The rolling mill according to the invention is characterized in particular in that the first bending device comprises bending arms which cooperate with bending cylinders arranged in a fixed position and in that the work rolls are advantageously adjustable in the axial and vertical directions.

[0020] In the context of the invention, a coupling element can be understood under the bending arms, which bridges the spatial separation from the bending cylinder to the point of action of the bending force on the work roll chuck. The structural and spatial separation of the first bending device from the second bending device enables a maximum roll travel of 900 mm, advantageously 1200 mm, particularly advantageously 1350 mm.

[0021] For the driving of the upper work roll during the adjustment of the rolling roll gap, the lifting stroke of the first bending device follows the vertical adjustment travel path of the height of the rolling roll gap, and thus the profile between the upper work roll and the work rolls is ensured for the rolling process. In this case, the first bending device is structurally separated from the roll position adjusting device.

[0022] In the rolling stand used for the method according to the invention, basically, the separation of the bending device for the upper work roll from the balance system for the upper backup roll is intended. By arranging the bending cylinder of the first bending device vertically, in a position-fixed manner, and preferably clearly above the work roll chuck, a relatively high roll lifting process is ensured during the guiding of this work roll chuck within the rolling stand housing window. This separation facilitates the accessibility of both devices for maintenance purposes.

[0023] Purposefully, when the height of the rolling roll gap is adjusted vertically, it is intended that the bending arm of the first bending device carries along the upper work roll.

[0024] The height of the rolling roll gap is pre-adjusted before the start of rolling (rolling pass). For this purpose, the upper roll position adjusting device moves the upper backup roll to the position at which the upper roll position adjusting device is held against gravity by the backup roll balance. The upper work roll follows this horizontal movement, whereupon this upper work roll is held by the arm of the bending device. The bending cylinder, and accordingly also the upper work roll, first follow the movement of the upper backup roll during these rolling passes. The additional lifting stroke of the bending cylinder causes the bending of the work roll and, accordingly, the desired adjustment of the profile of the rolling roll gap throughout this pass. Additionally, the rolling roll gap profile can be adjusted by the axial movement of the deflected work roll.

[0025] A further aspect of the invention relates to a hot rolling plant for carrying out the method according to the invention. This hot rolling plant is characterized by a single rolling device or a number of homogeneous rolling devices of a single rolling stand type, The rolling devices are preferably arranged directly one behind the other in one rolling line, and the rolling line is formed by rolling devices of only one rolling stand type and exclusively of the same type. "Directly one behind the other" in the sense of the present invention means that there is no intervening machine unit such as a furnace or the like between the individual rolling stands. However, it is possible for a side guide device for the rolled material to be provided between these rolling stands.

[0026] Preferably, at least one of these rolling devices has an axial movement and bending device for the work rolls, and even more preferably, is formed with at least one work roll pair having roll camber, particularly preferably having S-shaped grinding.

[0027] The hot rolling facility in the manner described above is provided with at least one rolling device having at least one upper and one lower work roll, and at least one upper and one lower backup roll, wherein the work roll and the backup roll are supported in a common rolling stand, the work rolls are position-adjustable relative to each other for adjusting a preset rolling roll gap, the work rolls are each operatively coupled with at least one bending device, one first bending device is assigned to the upper work roll and one second bending device is assigned to the lower work roll, the second bending device comprises bending cylinders, these bending cylinders are arranged in a vertically fixed position, and the upper work roll is adjustable or drivable in the vertical direction for adjusting the height of the rolling roll gap between rolling passes using the first bending device Post-adjustment is possible or feasible. The rolling mill according to the present invention is characterized in that, in particular, the first bending device includes a bending arm, these bending arms cooperate with a bending cylinder arranged in a fixed manner, and the work roll is advantageously characterized in that it is adjustable in position in the axial direction and the vertical direction.

[0028] The present invention will be described below based on the embodiments illustrated in the drawings.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0030] First of all, FIG. 1 is referred to. The layout of the rolling facility 100 with the only rolling mill 1 is illustrated, and a semi-finished product having a thickness of 150 mm or more is supplied as a rolled material through the supply roller table 101. The rolled material is reduced, for example, to a final thickness of 5 mm in the reversibly operated rolling mill 1 having a plurality of passes. The width of the rolled material is set through the edger 102 arranged in the rolling line behind the rolling mill 1. Through the output side roller table 103, the product rolled to the finished state first reaches the pre-correction machine 104 and then reaches the hot correction machine 105. The normal mechanism units for scale removal of the raw material in front of the rolling mill 1 and for cooling of the product rolled to the finished state are not shown in more detail in this embodiment.

[0031] FIG. 2 shows the rolling mill 1 for use in the method according to the invention and in a rolling facility. The rolling mill 1 comprises a rolling stand 2 having two work rolls 3 and 4 and two backup rolls 5, 6. The rolling stand 2 described in the embodiment is formed as a four-high rolling stand, which, however, can also have other configurations. A rolling roll gap 7 is formed between the work roll 3 and the work roll 4, and the rolled material is drawn into the rolling roll gap 7 during the operation of the rolling mill 1. The height 8 of the rolling roll gap 7, also referred to as the roll ascending process, can be adjusted in the rolling mill 1 according to the invention via the upper roll position adjusting device 28 and a lower roll position adjusting device (not shown). Furthermore, the work rolls 3, 4 can also be adjusted in the axial direction as will be further described below, and thus, the contour of the rolling roll gap 7 can also be adjusted through the relative axial position adjustment of the work rolls 3, 4.

[0032] The work rolls 3, 4 and backup rolls 5, 6 are held within the rolling stand 2, which comprises two rolling stand pedestals 31, one on the operator side and one on the drive side. These rolling stand pedestals 31 are configured as closed frames, within which all rolling forces are held in equilibrium via internal forces. The rolling stand 2 houses backup roll chucks 9, 10 and work roll chucks 11, 12, which are each movably arranged inside window portions 32 formed by the rolling stand pedestals. The backup roll chucks 9, 10 support the lower backup roll 5 and the upper backup roll 6, with the backup roll chuck 10 shown in the figure supporting the upper backup roll 6 and the backup roll chuck 9 supporting the lower backup roll 5.

[0033] Between the backup roll chuck 9 and the backup roll chuck 10, there are arranged a work roll chuck 11 and a work roll chuck 12, within which the work rolls 3, 4 are supported. The upper work roll chuck 12 supports the upper work roll 4, while the lower work roll chuck 11 supports the lower work roll 3.

[0034] The work roll chuck 11 that houses the lower work roll 3 is movably arranged within a position-fixed block 13. To enable the bending of the lower work roll 3, these blocks 13 house bending cylinders 14. These bending cylinders 14, which act on the lower work roll chuck 11 for the lower work roll 3, are part of the lower second bending device. Optionally for these blocks 13, the rolling stand 2 can also have a thickened portion for housing the bending cylinders 14 (not shown).

[0035] In the backup roll chuck 10 for the upper backup roll 6, the balance arm 33 is engaged, and through these balance arms, the self-weight of the backup roll 6 can be compensated using a balance cylinder (not shown). For this purpose, the balance arm 33 is provided with hook-shaped thick portions, and these thick portions engage the corresponding protrusions of the backup roll chuck 10 from below.

[0036] The work roll bending and / or work roll balance of the upper work roll 4 is realized through the bending cylinders 15, and these bending cylinders are operatively coupled to the upper work roll 4 through the bending arms 16. The bending cylinders 15 and the bending arms 16 are part of the upper first bending device. These bending cylinders 15 are supported in a position-fixed manner in the upper lateral head 34 of the rolling stand frame 31, or are supported on the upper lateral head 34 of this rolling stand frame 31 and penetrate the notch 35 of this rolling stand frame 31. These bending cylinders 15 basically extend in the vertical direction. Within the extension of these bending cylinders 15, the bending arms 16 are fixed to this bending cylinder, and these bending arms each have a thick portion 17 at the lower end. The thick portions 17 of these bending arms 16 engage the lateral ear-shaped protrusions of the upper work roll chuck 12 of the upper work roll 4 from below. The bending cylinders are preferably configured for a large lifting stroke that exceeds the work roll wear including the roll upward movement process.

[0037] The bending arm 16 is guided vertically, using the guide element 18, within the notch 36 of the rolling stand 2 or within the rolling stand pedestal 31 of this rolling stand 2. When the height 8 of the rolling roll gap 7 is adjusted, the upper work roll 4 and the upper backup roll 6 are carried along via the bending arm 16 engaging the work roll chuck 12 with the thickened part 17 from below.

[0038] The bending cylinders 14, 15 act on the outer edge regions of the work rolls 3, 4 and, accordingly, act with a force oriented vertically and outward from the rolling roll gap 7 within the edge regions of these work rolls 3, 4, corresponding to the force of the rolled material, in order to prevent the work rolls 3, 4 from being bent away from each other by the rolled material in the intermediate region between these work rolls 3, 4.

[0039] The bending cylinders 14, 15 are utilized in the first embodiment of the invention illustrated in FIG. 2 to achieve so-called positive work roll bending. Additional piston cylinder systems 19, 20 are provided for increasing the profile adjustment by means of so-called negative work roll bending, and these act vertically respectively.

[0040] FIG. 5 shows a second embodiment of the rolling device 1 according to the invention. The same structural members are provided with the same reference signs. Different from the embodiment according to FIG. 2, there, the bending cylinder 15 of the first bending device partially dips from below into the arrow-shaped notch 35 of the upper lateral head 34 of the rolling stand 2 within the upper region of the window 32.

[0041] The embodiment according to FIG. 5 further differs from the embodiment according to FIG. 2 in that window-shaped notches 36 are provided within the bending arm 16, and correspondingly formed edges (Leisten) 37 of the upper work roll chuck 12 for the upper work roll 4 engage into these notches. Accordingly, the upper work roll chucks 12 for the upper work roll 4 are fixed in a direction of moving away from each other in the vertical direction. Therefore, the upper work roll 4 can be bent in the positive and negative directions using the bending cylinder 15.

[0042] FIG. 6 shows an alternative exemplary embodiment of the fixed position fixing of the bending cylinder 15 in the rolling stand 2. Here, a plurality of bending cylinders 15 are arranged on the outside on the rolling stand base 31 of the rolling stand 2 and act on the extension 30 of the bending arm 16 respectively.

[0043] The rolling mill 1 according to the present invention similarly includes an axial movement device 21, and these axial movement devices are respectively arranged in the outer edge regions of the work rolls 3 and 4.

[0044] The axial movement device 21 for the axial movement of the work rolls 3 and 4 is provided on the work roll chucks 11 and 12 on the operating side and includes a piston cylinder unit that can be operated hydraulically. At this time, the piston of the piston cylinder unit is coupled to a holding arm 24 guided in the corresponding chuck respectively. The locking members arranged outside both lateral beams of the rolling stand base on the operating side prevent the horizontal movement of these holding arms 24 during the entire rolling operation, and accordingly, prevent the axial movement of the piston 22 of the piston cylinder unit. Axial movement is achieved for the work rolls 3 and 4 supported in the work roll chucks 11 and 12 by the pressure load on the piston side or the rod side of the piston cylinder unit.

[0045] FIG. 3 shows a cross-sectional view of the rolling mill 1 according to FIG. 5 along line B-B in FIG. 5, and this cross-sectional view illustrates the structure of the axial movement device 21 and the cooperative action of these axial movement devices with the upper work roll 4. The axial movement device 21 includes at least one hydraulically acting piston 22 arranged on the holding arm 24 via a reaction support 25. The holding arm 24 is arranged in a horizontally sliding state within the work roll chucks 11, 12 and is gripped from the surroundings by the lateral holding devices 29, which are fixed outside the rolling stand 2 and prevent the horizontal movement of the holding arm 24 in the direction of the roll axis 23. Accordingly, similarly, the piston 22 of the axial movement device 21 is fixed in the axial direction. These holding arms 24 are vertically movable within the lateral holding devices 29.

[0046] From the cross-sectional view shown in FIG. 3, the interaction of the profiled outer guide element 18 of the bending arm with the correspondingly formed guide recess 38 of the rolling stand pedestal 31 or the cross beam of this rolling stand pedestal 31 can also be recognized.

[0047] FIG. 4 shows an alternative embodiment of the axial movement device 21. The same structural members are provided with the same reference numerals in FIG. 4. The axial movement device 21 according to FIG. 4 differs from the axial movement device illustrated in FIG. 3 in that the holding device 29 is fixed on the bending arm 16 and, accordingly, is involved in the adjustment of the height 8 of the rolling roll gap 7.

[0048] FIG. 7 shows an alternative embodiment of the guide of the bending arm 16 inside the rolling stand 2. On the side of the bending arm facing the cross beam of the rolling stand pedestal 31, the bending arm 16 is provided with guide recesses 38 that grip the corresponding guide profile 39 of the cross beam of the rolling stand pedestal 31 from the surroundings. Note that this application relates to the invention described in the claims, but may also include the following as other aspects. 1. A method for hot rolling a metallic rolled material under the use of at least one rolling device, wherein this method includes the preparation of a semi-finished product having a thickness of 150 mm or more as the rolled material, in the method wherein the rolled material is rolled from an initial large initial pass cross-sectional area to a relatively smaller target cross-sectional area under progressive thickness reduction, the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area, is achieved exclusively by a single rolling device or by a number of homogeneous rolling devices of a single roll stand type, characterized by the method. 2. The method according to 1 above, characterized in that a semi-finished product in the form of a slab having a thickness of 550 mm or more, obtained by an ingot casting method or a continuous casting method, is prepared as the rolled material. 3. The method according to 1 or 2 above, characterized in that the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area is achieved at the only heat of the rolled material. 4. Having an axial movement and bending device for the work roll, Advantageously having a roll crown, particularly advantageously performed by the exclusive use of a pair of work rolls having an S-shaped ground roll shape, characterized by the method according to any one of 1 to 3 above. 5. The method according to any one of 1 to 4 above, characterized in that it is performed by the use of a rolling device having a maximum roll up process of at least 900 mm, advantageously at least 1000 mm. 6. The method according to any one of 1 to 5 above, characterized in that the ratio of the initial thickness of the initial cross-sectional area of the rolled material to the target thickness of the target cross-sectional area of the rolled material is between 2 and 5, advantageously between 2 and 3. 7. A method performed by the use of at least one rolling device (1) having at least one upper and lower work roll (3, 4), and at least one upper and lower backup roll (5, 6), wherein the work roll (3, 4) and the backup roll (5, 6) are supported within a common rolling stand (2), The work rolls (3, 4) are adjustable relative to each other for adjusting a preset rolling roll gap (7), the work rolls (3, 4) are each operatively coupled to at least one bending device, at least one first bending device is assigned to the upper work roll (4), and at least one second bending device is assigned to the lower work roll (3), the second bending device comprises a bending cylinder (14), these bending cylinders are arranged in a vertically fixed position, and the upper work roll (4) is rear-adjustable or drivable using the first bending device for vertically adjusting the height (8) of the rolling roll gap (7), the first bending device comprises bending arms (16), these bending arms cooperate with a bending cylinder (15) arranged in a fixed position, and the work rolls (3, 4) are preferably adjustable in the axial and vertical directions, A method according to any one of the above 1 to 6, characterized in that. 8. The method according to 7 above, characterized in that when the height (8) of the rolling roll gap (7) is adjusted, the bending arms (16) of the first bending device carry along the upper work roll (4). 9. A hot rolling facility preferably for implementing the method according to any one of the above 1 to 8, provided with a single rolling device, or a number of like rolling devices of a single rolling stand type, preferably arranged directly one behind the other within one rolling line, A hot rolling facility, characterized in that the rolling line is formed exclusively by like rolling devices of a single rolling stand type. 10. At least one of these rolling devices within the rolling line, has an axial movement and bending device for the work roll, preferably having a roll camber, particularly preferably having a roll shape ground in an S-shape, together with a work roll pair, A hot rolling facility according to 9 above, characterized in that. 11. At least one rolling device (1) is provided, having at least one upper and lower work roll (3, 4), and at least one upper and lower backup roll (5, 6), The work rolls (3, 4) and the backup rolls (5, 6) are supported within a common rolling stand (2), the work rolls (3, 4) are relatively position - adjustable with respect to each other for adjusting a preset rolling roll gap (7), the work rolls (3, 4) are each operatively coupled to at least one bending device, at least one first bending device is assigned to the upper work roll (4), and at least one second bending device is assigned to the lower work roll (3), the second bending device comprises a bending cylinder (14), these bending cylinders are arranged in a vertically fixed position, and the upper work roll (4) is rear - adjustable or trainable for vertical adjustment of the height (8) of the rolling roll gap (7) using the first bending device, the first bending device comprises bending arms (16), these bending arms cooperate with a fixedly arranged bending cylinder (15), and the work rolls (3, 4) are preferably position - adjustable in the axial and vertical directions, a hot rolling facility according to claim 9 or 10 above, characterized in that.

Explanation of Symbols

[0049] 1 Calendering device 2 Calendering stand 3 Lower work roll 4 Upper work roll 5 Lower backup roll 6 Upper backup roll 7 Roll gap for calendering 8 Height of roll gap for calendering 9 Backup roll chuck 10 Backup roll chuck 11 Work roll chuck 12 Work roll chuck 13 Bending block 14 Bending cylinder of lower work roll 15 Bending cylinder of upper work roll 16 Bending arm 17 Thick part of bending arm 18 Guide element 19 Piston cylinder system 20 Piston cylinder system 21 Axial direction moving device 22 Piston 23 Axis of work roll 24 Holding arm 25 Reaction force supporting part 26 Bearing 27 Cylinder housing 28 Upper roll position adjusting device 29 Lateral holding device 30 Extension part of bending arm 31 Calendering stand pedestal 32 Window part 33 Balance arm of SW (backup roll chuck) 34 Lateral head 35 Notch part of QH (lateral head) 36 Notch part of WS (calendering stand pedestal) 37 Frame edge 38 Guide recess 39 Guide contour part 100 Rolling equipment 101 Supply roller table 102 Edger 103 Output side roller - Table 104 Pre - straightening machine 105 Hot straightening machine

Claims

1. A method for hot rolling a metallic rolled material under the use of at least one rolling device, comprising: preparing a semi-finished product having a thickness of 150 mm or more as the rolled material; rolling the rolled material from an initial large initial pass cross-sectional area to a relatively smaller target cross-sectional area under progressive thickness reduction; the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area is achieved by a single rolling device or by a number of homogeneous rolling devices of a single rolling stand type; in the method, at least one of the rolling devices (1) has at least one upper and lower work roll (3, 4); the rolling device (1) is provided with at least one upper and lower backup roll (5, 6); the work rolls (3, 4) and the backup rolls (5, 6) are supported in a common rolling stand (2); the work rolls (3, 4) are relatively position-adjustable with respect to each other for adjusting a preset rolling roll gap (7); the work rolls (3, 4) are each operatively coupled to at least one bending device; at least one first bending device is assigned to the upper work roll (4), and at least one second bending device is assigned to the lower work roll (3); the second bending device comprises a bending cylinder (14); these bending cylinders are arranged in a vertically fixed position, and the upper work roll (4) is adjustable for vertical adjustment of the height (8) of the rolling roll gap (7) using the first bending device; the first bending device comprises a bending arm (16); these bending arms cooperate with a fixedly arranged bending cylinder (15), and the work rolls (3, 4) are position-adjustable in the axial and vertical directions; these bending cylinders (15) of the first bending device are fixedly supported or supported on the upper lateral head (34) of the rolling stand housing (31) and penetrate vertically through a notch (35) formed in a quiver shape in the rolling stand housing (31); characterized by the method.

2. The method according to claim 1, characterized in that a semi-finished product in the form of a slab having a thickness of 550 mm or more, obtained by an ingot casting method or a continuous casting method, is prepared as the rolled material.

3. The method according to claim 1, characterized in that the thickness reduction from the initial pass cross-sectional area to the target cross-sectional area is achieved at the sole heat of the rolled material.

4. Having an axial movement and bending device for the work roll, or by using a rolling mill having a work roll pair having a roll camber, or having a roll shape polished in an S shape, as claimed in claim 1.

5. Performed by using a rolling mill having a maximum roll lift of at least 900 mm, or at least 1000 mm, the roll lift being position adjustable via an upper roll position adjusting device (28) and a lower roll position adjusting device, The method according to claim 1, characterized in that.

6. The method according to claim 1, characterized in that the ratio of the initial thickness of the initial cross-sectional area of the rolled material to the target thickness of the target cross-sectional area of the rolled material is between 2 and 5, or between 2 and 3.

7. The method according to claim 1, characterized in that when the height (8) of the rolling roll gap (7) is adjusted, the bending arm (16) of the first bending device follows the upper work roll (4).

8. A hot rolling facility for carrying out the method according to any one of claims 1 to 7, comprising a sole rolling mill or a number of like rolling mills of a sole rolling stand type arranged directly one behind the other within one rolling line, the rolling mill further comprising at least one of the rolling mills within the rolling mill (1) having at least one upper and one lower work roll (3, 4), and at least one upper and one lower backup roll (5, 6), the work roll (3, 4) and the backup roll (5, 6) being supported within a common rolling stand (2), the work roll (3, 4) being relatively position adjustable with respect to each other for adjustment of a preset rolling roll gap (7), the work roll (3, 4) being operatively coupled to at least one bending device respectively, At least one first bending device is assigned to the upper work roll (4), and at least one second bending device is assigned to the lower work roll (3). The second bending device includes a bending cylinder (14). These bending cylinders are arranged in a vertically fixed position in the vertical direction, and the upper work roll (4) is adjustable using the first bending device for vertical adjustment of the height (8) of the rolling roll gap (7). The first bending device includes bending arms (16). These bending arms cooperate with a bending cylinder (15) arranged in a fixed position, and the work rolls (3, 4) are adjustable in the axial and vertical directions. These bending cylinders (15) of the first bending device are supported in a fixed position on the upper lateral head (34) of the rolling stand frame (31), or are supported on the upper lateral head (34) of the rolling stand frame (31) and penetrate vertically through a notch (35) formed in a quiver shape in this rolling stand frame (31). A hot rolling facility characterized by the above.

9. At least one of these rolling devices in the rolling line has an axial movement and bending device for the work roll, and has a work roll pair having a roll camber or a roll shape polished in an S shape, The hot rolling facility according to claim 8.

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