EP4072747B1 - Warmwalzgerüst für ein warmwalzwerk und zum herstellen eines metallenen flachprodukts, warmwalzwerk sowie verfahren zum betreiben eines warmwalzwerks - Google Patents

Warmwalzgerüst für ein warmwalzwerk und zum herstellen eines metallenen flachprodukts, warmwalzwerk sowie verfahren zum betreiben eines warmwalzwerks Download PDF

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Publication number
EP4072747B1
EP4072747B1 EP20830107.7A EP20830107A EP4072747B1 EP 4072747 B1 EP4072747 B1 EP 4072747B1 EP 20830107 A EP20830107 A EP 20830107A EP 4072747 B1 EP4072747 B1 EP 4072747B1
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EP
European Patent Office
Prior art keywords
roll
hot
stand
work
rolling
Prior art date
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Active
Application number
EP20830107.7A
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German (de)
English (en)
French (fr)
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EP4072747C0 (de
EP4072747A1 (de
Inventor
Jens KREIKEMEIER
Gokhan Erarslan
Stephan Fischer
Joachim Hafer
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP4072747C0 publication Critical patent/EP4072747C0/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/001—Convertible or tiltable stands, e.g. from duo to universal stands, from horizontal to vertical stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/203—Balancing rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/36—Spacers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting

Definitions

  • the invention relates to a hot rolling stand for a hot rolling mill and for producing a metal flat product, comprising an adjusting device which is intended to accommodate a pair of work rolls and to position work rolls of the pair of work rolls relative to one another while defining a roll gap.
  • the invention further relates to a hot rolling mill and a method for operating a hot rolling mill.
  • Metallic raw products are formed with the help of rolling mills.
  • starting products from a primary forming are formed to an intermediate or final dimension in the hot state.
  • the hot rolling mills can, for example, be connected directly to a continuous casting plant.
  • a hot rolling train for a flat product has a compensation or warm-up furnace for heating and / or homogenizing the preliminary product to the desired forming temperature and other units.
  • these units are then built up one after the other in a line to form a rolling train.
  • these are hot rolling stands, transport lines, cooling devices, separating devices, heating devices and / or surface treatment devices.
  • the rolling stock to be treated is formed using work rolls of a pair of work rolls, which is usually accommodated in a roll stand in combination with support rolls.
  • a roll diameter range of the work rolls is usually determined with regard to a wide variety of operating parameters of the hot rolling mill and also the parameters to be achieved of the end product to be produced.
  • the US 4,038,857 A which forms the basis for the preamble of claim 1, discloses a roll stand with an adjusting device which is intended to accommodate a pair of work rolls and to position work rolls of the pair of work rolls relative to one another while defining a roll gap.
  • a roll stand emerges which reveals a configuration change from a roll stand in a four-to-one design to a roll stand in a six-to-one design in order to be able to roll a more comprehensive range of thicknesses.
  • both an intermediate roll set and a work roll set are introduced into the installation space of the work roll set, the work rolls having a relatively small roll diameter.
  • the invention is based on the object of realizing a hot rolling stand for a hot rolling mill, wherein the hot rolling stand should be adaptable as flexibly as possible to different finished products, process controls, dimensions, materials and / or quality requirements, without an additional/further set of rolls to be included in the framework.
  • a hot rolling mill in which at least one hot rolling stand according to the invention is used is also the subject of claims and 7.
  • claims 8 to 14 relate to a method for operating a hot rolling mill.
  • a hot rolling stand comprises an adjusting device which is intended to accommodate a pair of work rolls and to position work rolls of the pair of work rolls relative to one another while defining a roll gap.
  • the adjusting device of the hot rolling stand preferably comprises a roll stand in which the pair of work rolls is mounted and in which the work rolls of the pair of work rolls are positioned relative to one another via further components of the adjusting device.
  • the pair of work rolls is particularly exposed two work rolls in the form of a lower work roll and an upper work roll together, with the individual work rolls in the assembled state in the roll stand preferably being guided in an associated guide element.
  • the respective guide element is in particular a respective chock in which the respective work roll is rotatably mounted.
  • each of the work rolls of the pair of work rolls is in contact with at least one support roll, on which the individual work roll can be supported in the course of a rolling process and the introduction of a corresponding forming force into the rolling stock to be formed.
  • These support rollers are also each preferably guided in an associated guide element, which is preferably also a chock.
  • the "adjusting device" of the hot rolling stand is a device via which the work rolls of the pair of work rolls can be positioned relative to one another, if necessary indirectly via intermediate support rolls, to form a desired roll gap.
  • the adjusting device comprises, in addition to two roll stands, further components which can include a wedge adjustment of a lower work roll of the work roll pair and/or a hydraulic adjustment of an upper work roll of the work roll pair and/or a work roll bending of the lower and/or the upper work roll.
  • the wedge adjustment, the hydraulic adjustment and the respective work roll bending can each have additional individual components.
  • the rolling stand according to the invention is designed as a hot rolling stand for use in hot rolling, ie for a rolling process of a rolling stock at a temperature above the recrystallization temperature of a metal to be processed.
  • a “roll gap” between the work rolls of the pair of work rolls is understood to mean a distance between the work rolls from one another.
  • the invention now includes the technical teaching that the adjusting device is set up to accommodate different roll diameter ranges in the pair of work rolls in an interchangeable manner with corresponding work rolls.
  • the adjusting device in the hot rolling stand according to the invention is designed to accommodate work rolls of a pair of work rolls, whereby the work rolls can be replaced in pairs while changing the roll diameter range.
  • the work rolls mounted in the hot rolling stand always correspond to each other with regard to the selected roll diameter range.
  • the selectable (working) roll diameter ranges differ from each other in that the diameter deviation goes (significantly) beyond the usual roll grinding.
  • Such a design of a hot rolling stand has the advantage that, due to the pairwise interchangeability of the work rolls of the pair of work rolls, the hot rolling stand can be adapted to the desired operating parameters.
  • This adjustment can be made by suitable selection of the roll diameter range with regard to a respective product to be manufactured, a respective process control, respective dimensions, respective materials and / or respective quality requirements, so that the spectrum of products that can be produced increases.
  • This adjustment can be done faster and more easily without having to bring additional rollers into the stand.
  • the introduction of an additional set of rolls would lead to extensive further adjustments with regard to the dimensions of the rolling stock in a hot rolling mill, e.g. the inlet guides, the drive train, but also the adjusting device, which e.g. B. must be carried out during a maintenance shutdown.
  • the invention can be used to realize a flexibly adjustable hot rolling stand, which can also be used to create a flexibly manageable hot rolling mill by selecting a roll diameter range of the replaceable work rolls with regard to the planned operating parameters.
  • the hot rolling stand according to the invention can be adapted to the production parameters to be represented, such as the product to be manufactured, a respective process control, respective dimensions, respective materials and / or respective quality requirements, without any compromise must be taken into account when choosing a roll diameter for the work rolls.
  • the hot rolling stand is designed in such a way that the work rolls of the pair of work rolls can be installed interchangeably and correspondingly with different roll diameter ranges.
  • at least two different roll diameter ranges can preferably be realized for the individual work roll of the work roll pair.
  • the work rolls of the work roll pair are always assembled with corresponding roll diameter ranges, i.e. the currently assembled work rolls always have the same roll diameter range.
  • the work rolls are replaced in the hot rolling stand preferably laterally and essentially perpendicularly, particularly preferably perpendicularly, to the longitudinal extent of a throughput section.
  • a “roll diameter range” is to be understood as meaning a diameter range of the individual work roll, which is characterized by a nominal roll diameter and a grinding area.
  • the grinding area defines a permissible decrease in diameter of the respective roller Operating time.
  • the selectable roller diameter ranges differ from each other in that the diameter deviation goes (significantly) beyond the usual roller grinding.
  • a deviation between the different roll diameter ranges is ⁇ 6%, preferably ⁇ 10%.
  • a deviation between the roll diameter ranges that can be represented by replacement is at least 6% between a small roll diameter range and a large roll diameter range, but preferably at least 10%. This has the advantage that with a deviation of this magnitude, the different requirements and also different relationships between rolling parameters and rolling diameter can be taken into account by changing.
  • a respective lower work roll of the pair of work rolls can be adjusted with its upper edge via the adjusting device at the level of a desired pass line.
  • a passline fluctuation is less than +/- 20 mm, preferably +/- 15 mm, particularly preferably +/- 10 mm.
  • the "passline" is to be understood as a difference in height between the lower work roll of the pair of work rolls and an adjacent roll of a roller table, whereby the fluctuation of the passline should be as low as possible, otherwise there will be difficulties in threading the rolling stock between the work rolls or even a Collision of the rolling stock with the lower work roll could occur.
  • the hot rolling stand is designed as a rough rolling stand.
  • the hot rolling stand is designed so that it is used within a hot rolling mill as a roughing stand for rolling the rolling stock on the input side in the hot rolling mill.
  • the hot rolling stand is designed as a finish rolling stand, which is used within a hot rolling mill in particular for gradually forming the rolled stock to a predetermined size.
  • the adjusting device comprises as components a wedge adjustment of a lower work roll of the pair of work rolls and / or a hydraulic adjustment of an upper work roll of the pair of work rolls and / or a work roll bend of the lower and / or the upper work roll, the components of the adjusting device each each have an adjustment range for interchangeably accommodating the corresponding work rolls with different roll diameter ranges. This creates the possibility of being able to accommodate work rolls with different roll diameter ranges in the hot rolling stand, since the components individually or in total can represent the strokes required for this.
  • the hot rolling stand is designed for reversing operation or one-way operation.
  • a design for a reversing operation means that the rolling stock is guided through the hot rolling stand several times and in a reversing manner, i.e. with opposite conveying directions, while in a one-way operation the rolling stock is passed through the hot rolling stand only in one direction and only once.
  • the invention also relates to a hot rolling mill which comprises at least one hot rolling stand which is designed according to one or more of the aforementioned variants.
  • the hot rolling mill is preferably composed of several units, which can include a preheating unit, a roughing train, an intermediate heating unit, a finishing rolling train, a transport unit, a winding unit and/or various separation units.
  • the hot rolling mill can have additional units, such as scale washers, possible induction heating devices, etc. exhibit.
  • a roughing mill with at least one roughing stand and a finishing mill with at least one finishing mill are provided in a hot rolling mill, with at least one roughing mill of the roughing mill and/or at least one finishing mill of the finishing mill being each a hot rolling mill according to one or more of the aforementioned Variants are executed.
  • work rolls of the respective pair of work rolls can be changed in pairs while changing the roll diameter range.
  • operating parameters of a production sequence to be represented by the hot rolling mill are first recorded.
  • the operating parameters define the process steps and process parameters of the hot rolling mill and the rolled stock necessary to produce a target product from a starting product Process steps. These operating parameters include the stitch decrease and operating mode parameters.
  • at least one hot rolling stand which is designed according to one or more of the aforementioned variants, a current roll diameter range of work rolls of a pair of work rolls of this hot rolling stand is determined. It is then checked whether the desired operating parameters can be achieved with the current roll diameter range of the at least one hot rolling stand. If this is the case, a rolling process is carried out without making any changes.
  • the work rolls of the work roll pair are changed in pairs while changing the roll diameter range and / or the operating parameters of the production sequence are changed in order to adjust the operating parameters and the Roll diameter range of the work rolls of the at least one hot rolling stand must be coordinated with one another.
  • the testing process is then repeated until the production sequence with the operating parameters in conjunction with the determined work roll diameter range match and the rolling process is then initiated.
  • the hot rolling mill can be used for a wide range of production without having to compromise on the operating parameters. If it is determined that the desired operating parameters cannot be achieved or not optimally with the currently installed work rolls, then as an alternative or in addition to changing the operating parameters, a modification of the roll diameter range of the pair of work rolls in the at least one hot rolling stand can also be carried out in order to achieve this Parameters can still be achieved or better. Overall, this enables flexible use of the hot rolling mill while at the same time reliably achieving the desired operating parameters.
  • a change is made to a smaller roll diameter range if there is a pass reduction of ⁇ 40% in the hot rolling mill, especially preferably ⁇ 50%, ⁇ 60% or very particularly preferably ⁇ 70% is determined.
  • Stitch reductions of this magnitude with work rolls with a smaller roll diameter range have the advantage that the system load, heat flow from the rolling stock into the respective roll and also energy consumption are reduced due to the reduced forming work.
  • the “stitch reduction” is to be understood as the thickness ratio of the rolling stock entering the roll gap to the rolling stock leaving the roll gap.
  • a further reason for changing to a smaller roll diameter range can be that a number of tappings of the individual work roll is smaller than a number of fully wound coils.
  • endless operation or semi-endless operation of the hot rolling mill in which the use of work rolls with a small roll diameter range is advantageous.
  • the same is preferably also carried out when a rolling stock to be rolled is rolled endlessly and, accordingly, de facto endless operation of the hot rolling mill takes place.
  • a change is made to a larger roll diameter range when a roll stand is tapped for each fully wound coil.
  • One tapping of a roll stand for each finished coil means a single operation or batch operation of the hot rolling mill, in which the use of work rolls with a larger roll diameter range is advantageous due to the greater thickness of the rolling stock.
  • the pressure angle can be kept small and slipping of the rolling stock can be avoided.
  • the method steps are guided by a system configurator.
  • This is a higher-level control unit provided, which carries out the process steps and can accordingly initiate and coordinate the change in a roll diameter range of the work rolls in the at least one hot rolling stand and / or a change in the production sequence to be presented if the appropriate requirements are met.
  • a calculation is carried out by the system configurator taking into account geometric limits based on the support rolls currently located in the individual roll stand.
  • the background here is that in a roll stand, the support rolls currently located in the roll stand in conjunction with the work rolls currently located in the roll stand define the geometric relationships and thus, if necessary, stroke limitations of the adjusting device are taken into account. For example, in the area of the ground support roll located in the stand, changing the work rolls to a different roll diameter range without simultaneously changing the support rolls can make it impossible due to the change in the lifting range.
  • changing the support rolls is significantly more complex than changing the work rolls, a necessary change of the backup rolls of a hot rolling stand and the associated effort can already compensate for the benefit of changing the roll diameter range of the work rolls.
  • a calculation is carried out by the system configurator taking into account process parameters such as gripping conditions, rolling speed, roll speed, drive speed, drive torque.
  • FIG. 1 shows a schematic view of a hot rolling mill 1, which is designed according to a preferred embodiment of the invention.
  • This hot rolling mill 1 can be connected in a production plant, in particular to an upstream continuous casting plant - not shown here - and includes a roughing train 2, a finishing train 3, a coiler system 4 and shears 5 and 6.
  • the input-side roughing train 2 which is composed of several roughing stands 8 arranged one behind the other, is followed by the shear 5, which is arranged in the main transport direction 7 between the roughing train 2 and the finishing rolling train 3.
  • the finishing rolling mill has several finishing rolling stands 9 arranged one behind the other, which are followed within the hot rolling mill 1 in the main transport direction 7 by the shears 6 and at the end by the coiling system 4.
  • other known components such as scale scrubbers, heating devices, cooling devices, etc. are not shown.
  • the Fig. 2 and 3 show views of a hot rolling stand 10, which can specifically be one of the roughing stands 8 of the roughing train 2 and/or one of the finishing rolling stands 9 of the finishing rolling train 3.
  • the hot rolling stand 10 is designed as a four-roll stand and comprises two roll stands 11, only one of which is visible in this view, an adjusting device 12, a pair of support rolls and a pair of work rolls 17.
  • the pair of support rolls consists of an upper support roll 13 and a lower one Support roller 14 together, each of which is rotatably accommodated in an associated chock 15 or 16.
  • the support rolls 13 and 14 of the pair of support rolls support the pair of work rolls 17, with which the rolling stock fed to the hot rolling stand 10 is formed.
  • 10 work rolls 18 and 19 as well as 20 and 21 with different roll diameter ranges can be accommodated in the hot rolling stand, whereby in Fig. 3 In the left half a shot of the work rolls 18 and 19 with a large roll diameter range is shown and in the right half a shot of the work rolls 20 and 21 with a small roll diameter range is shown.
  • the currently mounted work rolls 18 and 19 or 20 and 21 of the pair of work rolls are always designed to have the same roll diameter range, with a change in the roll diameter range causing the work rolls 18 and 19 or 20 and 21 to be changed in pairs.
  • a deviation between the small roll diameter range and the large roll diameter range is ⁇ 6%, preferably ⁇ 10%.
  • the individual work roll 18 or 19 or 20 or 21 is rotatably guided in an associated chock 22 or 23 or 24 or 25.
  • the adjusting device 12 includes the roll stands 11 as components a wedge adjustment 26 of the lower support roll 14 and the lower work roll 18 or 20, a hydraulic adjustment 27 of the upper support roll 13 and the upper work roll 19 or 21, as well as a work roll bend 28 or 29 of the upper work roll 19 or 21 and the lower work roll 18 and 20.
  • the wedge adjustment 26, the hydraulic adjustment 27 and the work roll bends 28 and 29 each have an adjustment range in order to accommodate the different strokes to represent the interchangeable recording of the work rolls 18 and 19 or 20 and 21 with the to be able to realize different roll diameter ranges.
  • a roller balancing 30 is assigned to the upper support roller 13.
  • the respective lower work roll 18 or 20 is positioned with its upper edge at the level of one inch Fig. 2 indicated, desired pass line 31, while the respective upper work roll 19 or 21 is aligned with the lower work roll 18 or 20 while defining the desired roll gap. If necessary, the roll gap is initially chosen to be larger for threading the rolling stock and then reduced.
  • FIG. 2 A drive for the mounted work rolls 18 and 19 or 20 and 21 can also be seen, with the view in Fig. 2 the work rolls 18 and 19 with the small roll diameter range are indicated by dashed lines.
  • two drive motors 32 and 33 are provided, which are connected in tandem.
  • a clutch 45 can be provided between the drive motors 32, 33.
  • the drive motors 32 and 33 are connected on the output side to a transmission gear 34, which may be designed as a manual transmission, which transmits a drive movement of the drive motors with translation to a comb roller gear 35, via which the translated drive movement is transmitted by means of spindles 36 and 37 to the associated, mounted work roll 18 or 19 or 20 or 21 is transmitted.
  • the work rolls 18 and 19 or 20 and 21 each have roller hits 38 and 39 or 40 and 41, which are picked up by associated hits 42 and 43 of the spindles 36 and 37.
  • roller diameters of the work rolls result not only in lifting movements H1, H2 of the hydraulic adjustment 27 and the wedge adjustment 26, but also in lifting movements (H3, H4) of the roller hits 38, 39, 40, 41 and the work roll chocks 22 , 23, 24, 25, which must be compensated for by the work roll bends 28,29.
  • the spindles 36, 37 used for both roll diameter ranges must be designed for a deflection resulting from the strokes.
  • production can also take place in an endless operation, in which the rolling stock is guided through the individual rolling stands as an endless belt.
  • the roll gap of each roll stand involved is set to the target thickness, with the first target thickness being chosen so large that the tapping can be carried out in a process-technically uncomplicated manner.
  • a transition piece is produced which has a wedge-shaped thickness gradient over its length.
  • the rolling stock/strip is separated only once by the scissors 6 and wound into individual coils via the coiling system 4.
  • the hot rolling mill 1 has a system configurator 44, which in Fig. 1 is indicated schematically.
  • this system configurator 44 is able, when the hot rolling mill 1 is in operation, to operate the hot rolling mill 1 according to a method according to the invention, the sequence of which is shown in the flow chart in Fig. 4 is indicated.
  • step S1 operating parameters of the production sequence currently to be displayed are determined, these operating parameters preferably including the parameters stitch decrease and operating mode. Upstream, downstream or parallel to this, it is also determined in a step S2 which roll diameter range of work rolls 18 and 19 or 20 and 21 of the work roll pair 17 of a hot rolling stand 10 is currently implemented, with this hot rolling stand 10, as described above, being replaced in pairs Work rolls 18 and 19 or 20 and 21 to work rolls with a different roll diameter range is possible.
  • one or more of the rough rolling stands 8 and/or one or more of the finishing rolling stands 9 can be designed in this way with replaceable work rolls.
  • step S3 the system configurator 44 then checks whether the operating parameters recorded in step S1 match the respective roll diameter range of the individual hot rolling stand 10 determined in step S2. If this is answered in the affirmative, a rolling process is carried out without change in a step S4.
  • step S3 if the result from step S3 is negative, the process goes to step S5 and/or step S6.
  • step S5 a change to the production sequence and thus the desired operating parameters is made, while in step S6 the system configurator 44 changes the roll diameter range by changing the work rolls in pairs.
  • the aim of the system configurator 44 is to coordinate the operating parameters and the respective roll diameter range.
  • step S6 the system configurator 44 takes into account geometric limits based on the support rolls 13 and 14 currently located in the individual hot rolling stand 10, since only a corresponding stroke range can be represented via the support rolls 13 and 14 of the respective hot rolling stand 10 and additional replacement of the support rolls 13 and 14 is very complex is.
  • the system configurator also takes into account 44 process parameters such as gripping conditions, rolling speed, roll speed, drive speed, etc.
  • the function of the invention is described using the example of a three-stand roughing train 2 with a roll diameter range 18.19 of 850 mm or a roll diameter range 20.21 of 1050 mm, which can be used in the hot rolling mill 1 with the two operating modes batch and endless.
  • the permissible grinding range of both roller diameter ranges is 100 mm.
  • the rolling stock is a simple carbon steel.
  • the system configurator 44 usually assigns various general parameters to the operating modes: Operating mode Strip thickness entrance to the roughing stand Belt speed Finished strip thickness Endless Small Small amount small Batch large high medium to large
  • the absolute stitch reduction is 70%
  • the mass flow (strip thickness times strip speed) and the rolling torque are relatively high.
  • the forming temperatures only change slightly due to the high belt speed.
  • the system configurator 44 checks the operating parameters (initial thickness, strip speed, roll speed, rolling torque and forming temperature) that arise in the intended "Batch" operating mode with a work roll diameter of 1050 mm used, based on the calculation model it itself or a connected calculation model, and comes to the conclusion that that the intended operating parameters and the roll diameter range used are suitable and the rolling process can be carried out under the planned conditions.
  • the mass flow and the rolling torque are relatively low, namely 22% of the comparison value for the batch operating mode.
  • the strip temperature changes significantly more, by an amount of 159 °C.
  • the system configurator 44 checks the operating parameters (initial thickness, strip speed, roll speed, rolling torque and forming temperature) that arise in the intended "endless" operating mode with a work roll diameter of 850 mm used, based on the calculation model it itself or a connected calculation model, and comes to the conclusion that that the intended operating parameters and the roll diameter range used are suitable and the rolling process can be carried out under the planned conditions.
  • the system configurator 44 can suggest with a changed switching stage of the transmission gear 34 or only with one Drive motor 33 to roll in order to realize the lower speeds and moments with optimal utilization of the motor.
  • the comparable speed would be 3.45 and would put a strain on the motor design.
  • the heat transfer would cause the forming temperature to drop even further, so that in an unfavorable case, undesirable structural changes could occur.
  • the system configurator 44 would come to the conclusion that either the intended rolling program needs to be adjusted or the use of a smaller roll diameter range should be used to improve the unfavorable operating conditions.
  • the two calculation examples shown are designed for a standard product.
  • the variance with regard to the alloy, temperature range, rolling stock width and input and output thickness results in significantly larger diversifications, which must be taken into account in the design and calculations of the system configurator.
  • a hot rolling mill By means of the design of a hot rolling stand according to the invention, a hot rolling mill can be realized which can be flexibly adapted to different finished products, process procedures, dimensions, materials and/or quality requirements.

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EP20830107.7A 2019-12-11 2020-12-11 Warmwalzgerüst für ein warmwalzwerk und zum herstellen eines metallenen flachprodukts, warmwalzwerk sowie verfahren zum betreiben eines warmwalzwerks Active EP4072747B1 (de)

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EP4072746B1 (de) 2019-12-11 2025-04-09 SMS group GmbH Modulare walzstrasse, insbesondere warmwalzstrasse, vorzugsweise in verbindung mit einer vorgeschalteten giesseinrichtung
CN119702702B (zh) * 2023-09-26 2025-11-14 宝山钢铁股份有限公司 一种控制热连轧机入口机架动态咬钢打滑方法

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EP4072747C0 (de) 2024-02-07
CN114786832A (zh) 2022-07-22
DE102020215769A1 (de) 2021-06-17
US20230060110A1 (en) 2023-02-23
JP2023510090A (ja) 2023-03-13
WO2021116460A1 (de) 2021-06-17
EP4072747A1 (de) 2022-10-19
US12343776B2 (en) 2025-07-01

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