EP2346625B2 - Procédé de réglage d'une épaisseur de sortie d'un matériau de laminage traversant un train de laminage à plusieurs équipements, dispositif de commande et/ou de réglage et installation de laminage - Google Patents

Procédé de réglage d'une épaisseur de sortie d'un matériau de laminage traversant un train de laminage à plusieurs équipements, dispositif de commande et/ou de réglage et installation de laminage Download PDF

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Publication number
EP2346625B2
EP2346625B2 EP09736931.8A EP09736931A EP2346625B2 EP 2346625 B2 EP2346625 B2 EP 2346625B2 EP 09736931 A EP09736931 A EP 09736931A EP 2346625 B2 EP2346625 B2 EP 2346625B2
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EP
European Patent Office
Prior art keywords
rolling
mill train
train
thickness
stand
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EP09736931.8A
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German (de)
English (en)
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EP2346625A2 (fr
EP2346625B1 (fr
Inventor
Ansgar GRÜSS
Alois Seilinger
Bernd Linzer
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Primetals Technologies Germany GmbH
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Primetals Technologies Germany GmbH
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Priority to EP09736931.8A priority Critical patent/EP2346625B2/fr
Priority to PL09736931.8T priority patent/PL2346625T5/pl
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Definitions

  • the invention relates to a method for setting an outlet thickness of a rolling stock passing through a multi-stand rolling train, in particular hot strip, a first section of the rolling stock being rolled to a first outlet thickness, a second section of the rolling stock being rolled to a second outlet thickness different from the first outlet thickness.
  • the invention also relates to a control and / or regulating device for a rolling plant comprising a multi-stand rolling train.
  • the invention also relates to a rolling plant with a multi-stand rolling train for rolling metallic rolling stock.
  • a generic method is for example from JP-A 08300010 known.
  • the present invention is in the technical field of rolling mill technology.
  • the rolling of metallic goods is generally used to manufacture semi-finished products which are subsequently used in the metalworking industry, for example in the automotive industry.
  • a rolling plant must be able to produce a wide variety of metallic semi-finished products, which differ, for example, in the metal to be processed, in the structural properties of the steel to be processed and the spatial dimensions, in particular the thickness.
  • the Japanese Patent Application Laid-Open JP 59191509 A2 discloses a method for changing material dimensions during the passage of rolling stock in a continuously operating rolling mill.
  • manipulated variables are calculated from an initial state and position tracking is carried out for the section of the strip for which the thickness is to be changed.
  • a roll gap and a roll speed are set accordingly for the respective roll stand. In particular, it is provided that there is no further thickness reduction on the last roll stand.
  • the object of the present invention is to provide an improved method for carrying out an on-the-fly change in thickness, as well as a corresponding control and / or regulating device and rolling system for this purpose.
  • the procedural part of the object is achieved by a method of the type mentioned at the outset, where a transfer from the first to the second outlet thickness takes place during rolling at an entry speed of the rolling stock into the rolling train, which is dependent on an exit speed of the rolling stock of one of the rolling train is set upstream unit in the direction of mass flow, with a first pass schedule and a second pass schedule being specified, the first run-out thickness being rolled when the first pass schedule is executed and the second run-out thickness is rolled when the second pass schedule is executed, the rolling train being operated according to the first pass schedule during rolling of a rolling stock is transferred in an operation of the rolling train according to the second pass schedule, the transfer for each rolling stand of the rolling train being carried out essentially during the rolling of a specified transfer section of the rolling stock through the respective rolling stand and de
  • the transfer section is rolled by means of a plurality of roll stands comprised by the rolling train, at least one roll stand being operated as a rolling-force-controlled roll stand during the rolling of the transfer section.
  • Such a transfer of the rolling stock from the first to the second outlet thickness during the rolling of the rolling stock is also referred to below as an on-the-fly change or change in the outlet thickness.
  • the procedure according to the invention makes it possible to keep the consumption of rolling stock for the on-the-fly change in the outlet thickness as low as possible, since only the transfer section is rejected and not the entire length of the rolling train, for example when the rolling stands are simultaneously transferred from operation according to the first pass schedule to Operation according to the second pass schedule. Accordingly, the scrap of rolling stock is reduced.
  • this method can advantageously be used in "conti" operation of a rolling train.
  • the thickness wedge is automatically detected, since when the transfer section enters the roll gap, the roll stand changes due to the changed thickness of the thickness wedge.
  • the change in rolling force at the respective roll stand depends on whether the entry thickness into the respective roll stand becomes smaller or higher as a result of the transfer. Before and after the rolling of the transfer section through the respective roll stands, these are preferably operated in a position-controlled manner.
  • the infeed speed determined serves as a fixed, not arbitrarily adaptable input variable for the rolling train, which in particular is not changed by processes downstream of the first rolling stand of the rolling train in the direction of mass flow. Rather, the entry speed of the rolling stock into the rolling train is dependent on an exit speed of the rolling stock of one or more units which are exclusively upstream of the rolling train in the direction of mass flow.
  • An actual discharge speed of the rolling stock of a unit arranged upstream of the rolling train in the direction of mass flow is preferably used as the discharge speed.
  • a target outlet speed of the rolling stock of a unit arranged upstream of the rolling train in the direction of mass flow can be used.
  • the run-out speed of that unit of the rolling system is preferably used which has the lowest time dynamics and therefore reacts more slowly to changes to its process than the other units.
  • This unit represents the limitation in the on-the-fly change of the outlet thickness. Further limitations for the on-the-fly change in the outlet thickness can result from the required or possible adjustment paths on the rolling stands and the required or possible acceleration of the work rolls of the rolling stands in the rolling train.
  • the outlet thickness is understood to mean the thickness of the rolling stock after the last roll stand of the rolling train, while the inlet thickness is understood to mean the thickness of the rolling stock before the first rolling stand of the rolling train.
  • the method is suitable both to convert a thinner outlet thickness into a thicker outlet thickness and vice versa. As a rule, however, changing the outlet thickness to a thinner outlet thickness is technically more demanding than converting a thinner outlet thickness into a thicker outlet thickness.
  • a unit is a device in a rolling mill that processes or produces a rolling stock, which is in an indirect or direct operative connection with the rolling train. Examples of this are reels, furnaces, roll stands, casting machines, shears, descalers, cooling sections, etc.
  • the infeed speed is usually a variable manipulated variable, with which, for example, a reaction to mass flow fluctuations or strip tension fluctuations in the rolling train - caused by the change in operation of the rolling train - by changing this manipulated variable.
  • a reaction to mass flow fluctuations or strip tension fluctuations in the rolling train - caused by the change in operation of the rolling train - by changing this manipulated variable.
  • the change in the infeed speed may be propagated to the units of the rolling train arranged upstream in the direction of mass flow. Depending on the structure of the rolling plant, this can lead to not inconsiderable problems in the process management of the processes running on the units upstream in the direction of the mass flow of the rolling train.
  • the present invention can be avoided by the present invention by determining, setting and maintaining the inlet speed of the rolling stock in the rolling train in such a way that an adaptation of a rolling stock outlet speed of a unit upstream in the direction of mass flow to the inlet speed of the rolling train is not necessary or is necessary to a lesser extent is.
  • the units upstream of the rolling train in the mass flow direction can be operated according to their setpoint values without the need to correct the setpoint values due to processes downstream in the mass flow direction, in particular due to a transfer of a rolling stock from a first outlet thickness to a second outlet thickness .
  • the invention enables the mass flow turbulence caused by the transfer in the rolling train to be completely cascaded out in the mass flow direction.
  • cascading against the direction of mass flow - as is common today - is not absolutely necessary, in that the inlet speed is either increased - for example when a first outlet thickness is transferred to a larger second outlet thickness - or decreased - for example when the first outlet thickness is transferred to a smaller second outlet thickness - becomes.
  • the inlet speed which is set as a function of an outlet speed of the rolling stock of a unit arranged upstream of the rolling train in the direction of mass flow, can be handled according to the invention as a hard boundary condition of the rolling process that must be observed.
  • the entry speed of the rolling stock into the rolling train is only changed retrospectively to processes upstream in the direction of mass flow during the transfer so that they can control the change in the feed speed in the rolling train with sufficient speed, i.e. no process disruption of the upstream processes in the direction of the mass flow Aggregates takes place.
  • the temporal dynamics of the unit are taken into account, i.e. how quickly and to what extent this unit can react to changes in the process without process disturbances occurring.
  • the present invention is applicable to both hot rolling and cold rolling of metal strips.
  • AGC Automatic Gauge Control
  • the inlet speed is set to be essentially constant as a function of an outlet speed of the rolling stock of an assembly upstream of the rolling train in the direction of mass flow.
  • Advantages according to the invention can hereby likewise be achieved in particular for slowly changing processes upstream of the rolling train. This is particularly advantageous in the case of composite casting and rolling systems, since the casting speed is usually constant and the casting unit is usually the unit with the least dynamic time.
  • the invention makes it possible to ensure a constant mass flow on the input side into the rolling mill. This leads to the corresponding planning security and a smoother flow of the processes that are upstream of the rolling train in the direction of mass flow.
  • the inlet speed is set essentially to the outlet speed of a next unit upstream of the rolling train.
  • This is particularly expedient when, for example in batch rolling, the distance between the slabs being rolled or to be rolled is very small.
  • This is also advantageous, for example, in continuous operation, "conti" operation or in “semi-endless” operation of a rolling mill. This enables the process to be carried out without being disturbed by the infeed speed of the rolling train in the units upstream of the rolling train in the direction of mass flow; in particular, there are no deviations from the desired strip tension or the desired mass flow.
  • the rolling train and at least one unit upstream of the rolling train in the direction of mass flow are coupled in terms of production technology through the rolling stock having the first and second rolling stock sections. That is to say, a change in the entry speed into the rolling train that is not caused by the upstream unit is propagated via the rolling stock into the units upstream of the rolling train in the direction of mass flow and thus has a disadvantageous influence on the processes taking place in these units.
  • units upstream of the rolling train in the direction of mass flow are not able to react to the relatively rapid changes in the infeed speed, as is customary in the prior art and is also necessary to compensate for mass flow fluctuations during the transfer.
  • the rolling stock may be incorrectly processed in at least one unit upstream of the rolling train in the direction of mass flow, if it cannot follow the changes in the inlet speed sufficiently quickly.
  • This is particularly important for composite casting and rolling systems in which, for example - as in the case of the Endless Strip Production system from Arvedi - the rolling stock extends from a casting machine through the entire rolling system, in particular through the rolling train, to a reel. There the finally rolled metal strip is wound up.
  • the casting plant is the "weakest" link in the chain with regard to the temporal dynamics of the unit.
  • the manipulated variables that can be set during casting can generally not influence the casting process as quickly as changes in the entry speed of the rolling train occur. This means that there are undesirable casting defects.
  • This also applies analogously to other units upstream of the rolling train in the direction of mass flow. All of this can be avoided by this advantageous embodiment of the invention.
  • the transfer section is determined in such a way that it has a length at any point in time during its passage through the rolling train which is at most equal to a distance between two adjacent rolling stands. This ensures that the on-the-fly change of the outlet thickness of the rolling train takes place particularly quickly and easily. If the thickness wedge is located in two roll stands at the same time, this means a considerable additional effort for the control of the on-the-fly change of the outlet thickness. It is therefore advantageous to determine the length of a transfer section in such a way that at a specific point in time during the transfer the thickness wedge is always processed in only one roll stand of the rolling train.
  • this condition is met when the length of the transfer section between the last and penultimate rolling mill stand in the rolling train causing a change in the thickness of the rolling stock is not greater than a distance between these two rolling stands.
  • the length of the transfer section to be determined depends on the number of roll stands in the rolling train, as well as the thickness of the entry of the rolling stock into the rolling train and the desired thickness of the exit thickness of the rolling stock from the rolling train.
  • the rolling force controller now tries to set the desired nominal rolling force again according to the first pass schedule for this roll stand.
  • the setpoint rolling force to be set is continuously changed in the direction of the rolling force setpoint according to the second pass schedule.
  • a so-called “ramp in” takes place from the nominal rolling force of the second pass schedule into the nominal rolling force of the first pass schedule.
  • a transfer of the operation of the rolling stand according to the first to a second pass schedule is handled analogously, in which the first outlet thickness from the rolling train is less than the second outlet thickness.
  • the first outlet thickness from the rolling train is less than the second outlet thickness.
  • an actual process variable set on the basis of the first pass schedule is continuously converted into a setpoint process variable determined on the basis of the second pass schedule.
  • process variables that experience a continuous change during the rolling of the transition section are, for example: setting position, setting force, peripheral speed of the work rolls, acceleration rate, etc. This is particularly advantageous for the change in the rolling force mentioned above during the rolling of the transfer section.
  • a continuous transfer i.e. jump-free or bump-free change in the process variables, simplifies the handling of the rolling stock for units downstream of the rolling train in the direction of mass flow and reduces the load on the system.
  • compliance with plant-related restrictions is checked when rolling the transfer section and the transfer from operation of the rolling train according to the first pass schedule to operation of the rolling train according to the second pass schedule is interrupted if the restrictions are violated or expected to be violated.
  • Plant-related restrictions are understood to be limiting boundary conditions, in particular of a technical nature, given by the plant, which must be complied with so that a plant can be operated as planned over a longer period of time and a desired product can be manufactured. Examples of system-related restrictions are, for example, maximum pitching speeds of the roll stands, maximum permissible drive loads, etc ..
  • the continuous review of the system-related restrictions which is preferably carried out during operation of the system, ensures that any overloads that may occur due to the rolling of the transfer section do not lead to a system defect and thus to system downtimes.
  • An interruption of the transfer is understood to mean any directed deviation from the planned execution, advantageously this is usually the fastest possible execution of the transfer.
  • a slowed down execution of the transfer can also be viewed as an interruption of the scheduled transfer. This allows gradients to be reduced when setting manipulated variables and process variables, which means that system restrictions can be complied with if necessary.
  • the rolling force and / or the roll gap of a roll stand to be passed through next by the transfer section is in addition to the first and second pass schedule depending on the strip tension between this roll stand and the roll stand upstream of this roll stand in the direction of mass flow. Due to the on-the-fly change in the outlet thickness in the rolling train, depending on the type of transfer, i.e. from a smaller outlet thickness to a higher outlet thickness or from a higher outlet thickness to a smaller outlet thickness, over-tension in the strip or loss of strip tension can occur between the rolling stands come. These can be caused by mass flow turbulence between the rolling stands of the rolling train.
  • a strip tension can be detected, for example, by means of a loop lifter between the individual roll stands of the rolling train.
  • the adjustment of the rolling stand through which the transfer section is next changed is now changed.
  • the aim of changing the pitch can be to adjust the roll gap or to adjust a desired rolling force for the rolling stock. If, for example, a voltage drop is detected, the roll gap of the roll stand next to which the transfer section will pass is opened in order to restore the strip tension, since more material can be transported through the next roll stand.
  • the adjustment is closed in order to reduce the strip tension between the roll stand to be passed through by the transfer section and the roll stand upstream of this roll stand in the direction of mass flow.
  • each roll stand of the rolling train is operated such that each roll stand achieves the same relative change in the thickness of the rolled stock.
  • a change in the relative change in the thickness of the rolled stock is understood here to be a measure of the ratio of the outlet thickness of the respective roll stand according to the first and second pass schedules. This allows the respective drives of the rolling stands to be accelerated uniformly during the transition from operation of the rolling train according to the first pass schedule to operation of the rolling train according to the second pass schedule.
  • the change in thickness is initiated by adjusting a first roll stand with simultaneous acceleration or deceleration of the following forming steps with the corresponding increase in the exit speed from the first adjusted roll stand of the rolling train and the relative exit thickness change for the respective rolling stand is followed up in the following rolling stands of the rolling train, so the entire rolling train can be converted to the second outlet thickness of the rolling train with little effort. Since each roll stand achieves the same relative change in the thickness of the rolling stock during the rolling of the transfer section, the drives of the entire rolling train need only be accelerated or decelerated when the respective roll stands are changed for the first time.
  • a redistribution of drive loads from the roll stand drives assigned to the rolling train during the rolling of the second outlet thickness may not be optimized for stationary operation of the rolling train to generate the second outlet thickness, but is optimized for the most problem-free implementation of the conversion of the first outlet thickness into the second outlet thickness. Therefore, a redistribution of the drive loads after the transfer has taken place can lead to a permanent reduction in the drive loads, which increases operational reliability.
  • Roll stand drives are those drives that drive the work rolls of the respective roll stands of the rolling train.
  • changes in the manipulated variables required due to the changed outlet thickness of the rolling train for at least one unit downstream of the rolling train in the direction of mass flow occur while the transfer section is being influenced by this at least one unit.
  • the coolant flow in the cooling section can be adapted accordingly to the new outlet thickness from the rolling train.
  • the torque and / or the speed of rotation of the reel can be adapted to the new outlet thickness from the rolling train.
  • This adjustment of the respective manipulated variables is preferably carried out precisely when the transfer section of the rolling stock is being influenced by changing this manipulated variable.
  • control and / or regulating device for a rolling plant comprising a multi-stand rolling mill, with a machine-readable program code which has control commands which the control and / or regulating device when it is executed cause a method according to one of claims 1 to 12 to be carried out.
  • a rolling plant with a multi-stand rolling train for rolling metallic rolling stock with a control and / or regulating device according to claim 13, with a device for supplying the outlet speed of the rolling stock of a unit upstream of the rolling train in the direction of mass flow to the control and / or regulating device according to claim 13, wherein the rolling stands of the rolling train are operatively connected to the control and / or regulating device.
  • a rolling plant is provided by means of which an on-the-fly change in the outlet thickness of a rolling train can be carried out easily.
  • a rolling plant is understood to mean any plant which comprises a rolling train, preferably for processing metallic rolled stock, in particular also composite cast and rolling plants.
  • the rolling train is a high reduction mill and / or a finishing train that is arranged downstream of a casting unit in the direction of mass flow.
  • a high reduction mill is a rolling train consisting in the present case of several stands, which rolls the rolling stock with a strong decrease in thickness while it is still very hot.
  • the rolling stock in the high reduction mill still had a liquid core, considerable process disruptions would be expected due to the high forces in the high reduction mill. Thanks to the high reduction mill, large reductions in the thickness of the rolled stock can be achieved in soft core reduction with comparatively low rolling forces.
  • the method according to the invention can advantageously be used for such a multi-stand high reduction mill.
  • the rolling train can alternatively or additionally be designed as a multi-stand finishing train, which rolls the rolling stock to the desired final dimensions.
  • the FIG 1 a system shown schematically for performing an embodiment of the method according to the invention. It also shows thickness profiles of a rolling stock rolled by the rolling train during the transfer of the rolling train operation according to a first pass schedule to a rolling train operation according to the second pass schedule for differently advanced transfer states of the rolling stock. It also shows FIG 1 Rolling force and circumferential speed curves as a function of time for the individual rolling stands of the rolling train.
  • FIG 1 shows a section from a rolling mill 1, which comprises a three-stand rolling train 2.
  • the rolling train 2 can be designed, for example, as a high reduction mill for a system for endless strip production.
  • the rolling train 2 can alternatively or additionally be designed as a multi-stand, for example five-stand, finishing train of a rolling mill 1.
  • the rolling train 2 comprises a first roll stand 3, a second roll stand 4, and a third roll stand 5.
  • FIG 1 shows the rolling mill 1 in a state in which the rolling stock G passes through the rolling mill 1, in particular the rolling train 2.
  • the entire rolling mill is coupled by the rolling stock G passing through the rolling mill, since the rolling mill 1 is constructed in one piece from the beginning to the end and different sections of the rolling mill G are located in other units of the rolling mill 1 for processing them.
  • the invention can be used particularly advantageously for this operating mode, ie for the "endless process". However, this invention is not limited to this mode of operation.
  • the rolling train 2 rolls a first section G-1 of the rolling stock to a first outlet thickness H3 of the rolling train 2.
  • outlet thickness is to be changed without, for example, interrupting the casting process, this can be done with the present method during the rolling of the rolling stock G which is coupled to the plant.
  • the outlet thickness from the rolling train 2 is to be converted from a first outlet thickness H3 for a first section G-1 of the rolling stock G to a second, thinner outlet thickness H3 'for a second section G-2 of the rolling stock G.
  • loop lifters 7, in particular for a rolling train 2 designed as a finishing train, are arranged. These are used to check the strip tension of the rolling stock G passing through the rolling train 2.
  • FIG 1 also shows a unit 6 arranged upstream of the rolling train 2 in the direction of mass flow, which unit is designed as a casting unit for casting steel.
  • FIG 1 also shows FIG 1 also a unit 8 which is arranged downstream of the rolling train in the direction of mass flow and which is designed, for example, as a cooling section.
  • the rolling stock G cast by the casting unit 6 couples in the stationary Operation of all units of the rolling mill 1 shown influencing the strip with one another.
  • a control and / or regulating device 9 controls or regulates the operation of the units 6, 2 or 8, in particular the operation of the rolling train 2, and is enabled by a machine-readable program code to carry out the on-the-fly change of the outlet thickness.
  • the machine-readable program code comprises control commands which, when executed, cause the control and / or regulating device 9 to carry out the method.
  • the rolling train 2 rolls a first run-out thickness H3 according to a first pass schedule.
  • the rolling stock G-1 enters the rolling train 2 or the first rolling stand 3 of the rolling train 2 with a thickness h0.
  • the first roll stand 3 rolls the rolling stock G-1 to a thickness H1.
  • the rolling stock of the thickness h1 then runs into the second roll stand 4 of the rolling train 2 and is rolled by this to your thickness H2.
  • the rolling stock G-1 then runs into the third roll stand 5 with the thickness H2 and is rolled by this to an outlet thickness H3.
  • a reduction in thickness of the first section G-1 of the rolling stock G according to the first pass schedule is shown directly below the schematically illustrated rolling mill 1.
  • a rolling operation of the rolling train 2 is carried out from a rolling operation according to the first pass schedule to a rolling operation of the rolling train 2 according to the second pass schedule during the rolling of rolling stock.
  • the usual calculation methods can be used to calculate pass schedules.
  • Such a calculation method can, for example, be the DE 37 21 744 A1 can be removed.
  • a transfer section X0 is first determined in front of the first roll stand.
  • the transfer section is a section of the rolling stock between the first and second sections G-1 or G-2 of the rolling stock G, which is usually used exclusively to transfer the rolling operation of the rolling train 2 according to a first pass schedule to an operation of the rolling train 2 according to the second pass schedule .
  • the start of a transfer section is usually processed according to a first pass schedule, the end of the transfer section according to a second pass schedule.
  • the transfer section X0 is in particular determined in such a way that it has a length during the transfer of the rolling operation according to the first pass schedule to the rolling operation according to the second pass schedule that is no greater than the distance between two roll stands at any time during the transfer. This ensures that the transfer is comparatively easy to handle in terms of control technology, because the transfer section is never located in two roll stands at the same time during the transfer.
  • the thickness wedge is rolled simultaneously in two or more adjacent roll stands during the transfer. This makes it possible to reduce the requirements for the rolling train, for example, with regard to adjustment paths and acceleration for the respective rolling stands of the rolling train and thus a transfer of the rolling train
  • the second runout thickness H3 'rolled according to the second pass schedule is less than the first runout thickness H3 rolled according to the first pass schedule, then it is necessary to select the transfer section X0 correspondingly short. Since this mass flow caused in the rolling stands is significantly lengthened in the transport direction of the rolling stock G, this ensures that the transfer section X2 to be processed by the last rolling stand 5 of the rolling train 2 has already run out of the rolling stand 4 upstream of this rolling stand 5 in the direction of mass flow.
  • the length of the transfer section X0 in front of the first stand of the finishing train is approx. 1m for normal outlet thicknesses at the end of the rolling train. It can thus be ensured that the length of the transfer section between the fourth and fifth roll stands is no longer than the distance between these roll stands, which is approximately 4.70 m, for example.
  • the transfer section X0 can also be selected to be correspondingly larger, since the mass flow in the transport direction of the strip is correspondingly lower.
  • Lengthening the transfer section X0 has the advantage that there is more time for the transfer, which means that the changes for the actuators for adapting the process variables are correspondingly lower and the probability of violating the boundary conditions given by the rolling mill 1 is reduced.
  • the transfer step S1 the transfer of the operation of the first roll stand 3 of the rolling train 2 according to the first pass schedule to a rolling operation according to the second pass schedule is shown.
  • the rolling force curve over time and the circumferential speed of the work rolls over time in particular during the transition from rolling operation of the roll stand 3 according to the first pass schedule to rolling operation according to the second pass schedule, are shown.
  • the first roll stand 3 is operated according to the first pass schedule, ie with the rolling force F1 and the working roll peripheral speed V1.
  • the first roll stand 3 is operated according to the second pass schedule, ie with the rolling force F1 'and the work roll peripheral speed V1'.
  • the Automatic Gauge Control or AGC for short, is preferably switched off. This has the advantage that the risk is avoided that the AGC tries to regulate the roll gap on the first roll stand 3 to the first pass schedule and thus counteracts the transfer of operation of the roll stand 3 from operation according to the first to the second pass schedule.
  • the work roll circumferential speed V1 'on the first roll stand 3 after the transfer is generally dependent on the change in thickness on the first roll stand 3.
  • the peripheral speed of the work rolls of the roll stand 3 increased in order to keep the mass flow through the rolling train 2 constant.
  • the difference ⁇ V1 between the circumferential speed V1 according to the first pass schedule and the circumferential speed V1 'according to the second pass schedule is passed on to the roll stands 4 or 5 downstream of the first roll stand 3 or the work roll peripheral speeds of the roll stands 4 or 5 downstream of the first roll stand 3 are based on the change in the rotational speed first roll stand 3 tracked.
  • the third roll stand 5 also has a work roll peripheral speed of V3 + ⁇ V1 during the above-mentioned period.
  • the rolling forces F2 and F3 for the roll stand 4 and 5 are kept essentially constant.
  • a transfer section X1 is created which has a thickness profile, also called a thickness wedge. This is shown, for example, in transfer step S2, which shows the thickness profile of the rolling stock G after the first roll stand has been transferred from rolling operation according to the first pass schedule to rolling operation according to the second pass schedule.
  • the first roll stand 3 can be operated only position-controlled SC or only rolling force-controlled FC.
  • a position-controlled operation of a roll stand is in FIG 1 marked with SC, a rolling force-controlled operation of a roll stand with FC.
  • This position-controlled or rolling force-controlled operation is in FIG 1 related to the time axis of the rolling force curve and the circumferential speed curve of the work rolls.
  • transfer step S1 shortly before the entry of the transfer section X0, the operation of the first roll stand 3 is changed from a position-controlled SC operation to a rolling force-controlled FC operation.
  • the change from rolling force-regulated operation to position-regulated operation and vice versa takes place on the basis of the strip tracking by means of which the transfer section is tracked. If the transfer section X0 has passed the first roll stand 3, the operation of the roll stand 3 is changed from a rolling force-controlled operation back to a position-controlled SC operation.
  • the aforementioned changes are made analogously for the subsequent roll stands 4 and 5, if the transfer section X1 or X2 is processed by them.
  • the roll stand 3 is rolled with the thickness distribution shown.
  • the roll stand 3 there is a decrease in thickness from the rolling stock thickness H0 to a new rolling stock outlet thickness H1 ′ from the first rolling stand 3.
  • the transfer step S2 the transfer of the operation of the second roll stand 4 of the rolling train 2 according to the first pass schedule to a rolling operation according to the second pass schedule is shown, the first roll stand already being operated stationary according to the second pass schedule.
  • the roll stand 4 Until the thickness wedge or the transfer section X1 enters the second roll stand 4, the roll stand 4 must pull in the rolling stock thickness H1 on the inlet side and roll this to an outlet thickness H2 on the second roll stand 4, but the work rolls of the second roll stand 4 have a peripheral speed of V2 + ⁇ V1 have due to the changed operation of the first roll stand 3.
  • the required loads or overloads of the drives are preferably taken into account when calculating the new pass schedule, so that they do not occur as planned when the rolling mill is switched from operation according to the first pass schedule to operation according to the second pass schedule.
  • the rolling force F2 is changed to a rolling force F2 'during the rolling of the transfer section.
  • the rolling force F2 is changed to a rolling force F2 'during the rolling of the transfer section.
  • the portion of the roller circumferential speed V2 ' is due to the changed outlet thickness H2' on the roll stand 4.
  • the rolling of the transfer section X1 in the second roll stand 4 takes place, as described above, with rolling force control FC.
  • a position-controlled SC operation of the roll stand 4 preferably takes place.
  • the transfer section X1 is transferred to the transfer section X2. Due to the change made to the roller circumferential speed in the second roll stand 4, the roller circumferential speed of the work rolls in the third roll stand 5 is to be adapted accordingly to the exit speed of the second section G-2 of the rolling stock G, which is now processed according to the second pass schedule.
  • the course of the thickness of the rolling stock G is shown after the transfer section X2 has emerged from the second roll stand 4.
  • a thickness wedge between the second roll stand 4 and the third roll stand 5 the thickness wedge having a thickness profile from a "new" outlet thickness H2 ', rolled according to the second pass schedule, to an "old" outlet thickness H2, rolled according to the first pass schedule , having.
  • the peripheral speed V3 of the work rolls of the third roll stand 5 is adapted to the exit speed of the rolling stock G from the second roll stand 4.
  • S5 shows the rolling force curve over time and the curve of the work roll circumferential speed for the respective roll stands, while the transfer section passes through the third roll stand 5. Meanwhile, the first and the second roll stand are already being operated in a stationary mode according to the second pass schedule.
  • the transfer section X2 or the thickness wedge has a length in front of the last roll stand 5 of the rolling train 2 which is less than the distance between the last roll stand and the penultimate roll stand of the rolling train, in the present embodiment thus the second roll stand 4 and the third roll stand 5.
  • the third is located Roll stand 5 before the thickness distribution shown.
  • the thickness wedge is also visible in the thickness distribution according to S6, which has a thickness profile from thickness H3 'to thickness H3.
  • the progression over time of the rolling force or the roll peripheral speed for the respective roll stands 3 to 5 is shown.
  • the roll stands 3 to 5 are now operated in a stationary, position-controlled manner according to the second pass schedule.
  • the rolling forces on the respective roll stands and the peripheral speeds of the work rolls of the roll stands are essentially constant - within the scope of the AGC that is then switched on again.
  • the invention is not restricted to use on three-stand rolling mills 2, but can be used particularly advantageously in four-, five-, six- and seven-stand rolling mills 2.
  • the process can also be used in batch operation, in semi-endless operation or in endless operation of a rolling mill or a composite casting and rolling plant.
  • a continuous check is carried out to determine whether the planned transfer of the rolling mill operation violates system restrictions in order to avoid damage to the rolling mill or to components of the rolling mill .
  • the rolling mill is operated according to the first pass schedule into operation according to the second Pass schedule interrupted, ie the planned transfer is deviated from in such a way that the corresponding system-related restrictions are not violated.
  • the unit upstream of the rolling train 2 in the direction of mass flow is a casting unit 6. This pours at a casting speed V0, which is used as the entry speed into the rolling train 2.
  • the inlet speed is therefore adapted to the casting speed V0 of the casting unit.
  • the casting unit is designed as a mold.
  • a casting unit In the case of a multi-stand finishing train, a casting unit is usually not arranged directly upstream of the finishing train in the direction of the mass flow. In such a case, however, it is nevertheless expedient to adjust the entry speed into the rolling train as a function of the casting speed V0 in such a way that the casting speed is essentially free of reaction from the entry speed of the rolling stock into the rolling train. Because the casting unit is only a small temporal dynamic with regard to control interventions. Because of this inertia, the casting unit is often the limiting unit.
  • the thickness wedge is transported away in the direction of mass flow.
  • the old outlet thickness H3 is to be processed up to a certain point in time, then the transfer section X3, and then the new outlet thickness H3 '.
  • the conversion of a unit from the processing of rolling stock according to the first pass schedule to the processing of rolling stock according to the second pass schedule takes place while the transfer section X3 is influenced by the respective unit.
  • the cooling section 8 Since the cooling section 8 is usually longer than the transfer section X3, when the cooling section 8 passes through the transfer section X3, part of the cooling section is operated in such a way that it cools the first section G-1 of the rolling stock G as planned and that it cools the second Section G-2 also cools according to plan, but in a different manner tailored to the product in question.
  • the changeover of the operation of the cooling section therefore always takes place for the section of the cooling section 8 which is currently influencing the transfer section X3.
  • the scrap of rolling stock is kept low, since the units downstream of the rolling train 2 in the direction of mass flow move from operation according to a first product plan to operation according to a second product plan, the first pass plan being assigned to the first product and the second pass plan to the second product , is changed.
  • each roll stand of the rolling train is operated in such a way that each roll stand makes the same relative change in the thickness of the rolled stock. That is, the relative change in thickness to get from the first outlet thickness of the rolling train to the second outlet thickness of the rolling train is distributed equally over all the rolling stands of the rolling train.
  • the following table contains a first pass schedule and a second pass schedule, as well as information about the relative change in thickness during the transition from operation of the rolling mill according to the first pass plan to operation of the rolling mill according to the second pass plan:
  • Outlet thickness [mm] Roller circumferential speed Vi [m / s]
  • Outlet thickness according to the second pass plan / outlet thickness according to the first pass plan
  • Roll stand i 1 15.00 50.00 7.50 2.00
  • Roll stand i 2 7.50 40.00 4.50 3.33
  • Roll stand i 3 4.50 25.00 3.38 4.44
  • Roll stand i 4 3.38 10.00
  • FIG 2 shows a further possibility for implementing the invention for rolling mill 1 comprising a two-roll casting machine 6 ', the cast rolling stock G then passing through a multi-stand, ie at least two-stand, rolling train 2.
  • Rolling stock G is generally produced in an endless operation by means of a two-roller casting machine 6 '.
  • the advantage of this type of system is that it is even more compact than an endlessly working system, which by means of mold 6, cf. FIG 1 . pours. Furthermore, the consumption of energy and resources is further reduced.
  • the rolling train 2 In order to convert the outlet product from a first outlet thickness to a second outlet thickness by means of a rolling train 2 downstream of the two-roller casting machine 6 ', the rolling train 2 can be operated in accordance with the explanations given in FIG FIG 1 be converted during operation in such a way that this goal is achieved.
  • the remarks on FIG 1 apply analogously to FIG 2 .

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Claims (12)

  1. Procédé de réglage d'une épaisseur (H3, H3') de sortie d'un produit (G) à laminer, notamment d'un feuillard à chaud, traversant un train de laminoir (2) à plusieurs cages, dans lequel on lamine un premier tronçon (G-1) du produit (G) à laminer à une première épaisseur (H3) de sortie, un deuxième tronçon (G-2) du produit (G) à laminer étant laminé à une deuxième épaisseur (H3') différente de la première épaisseur (H3) de sortie,
    caractérisé
    - en ce que l'on effectue un passage, s'effectuant pendant le laminage, de la première à la deuxième épaisseur de sortie à une vitesse (V0) d'entrée du produit (G) à laminer dans le train (2) de laminoir, qui est réglé en fonction d'une vitesse (Vg) de sortie du produit (G) à laminer d'un groupe (6) en amont dans la direction du flux massique du train (2) de laminoir,
    - en ce que l'on prescrit une première séquence des passes et une deuxième séquence des passes, en laminant, lors de l'exécution de la première séquence des passes, la première épaisseur (H3) de sortie et, lors de l'exécution de la deuxième séquence des passes, la deuxième épaisseur (H3') de sortie, un fonctionnement du train (2) de laminoir suivant la première séquence des passes devenant, pendant le laminage d'un produit (G) à laminer, un fonctionnement du train (2) de laminoir selon la deuxième séquence des passes, le passage pour chaque cage (3, 4, 5) du train (2) de laminoir s'effectuant essentiellement pendant le laminage d'un tronçon (X0, X1, X2) de passage fixé du produit (G) à laminer dans la cage (3, 4, 5) de laminoir respective et
    - en ce que l'on lamine le tronçon (X0, X1, X2) de passage au moyen d'une multiplicité de cages (3, 4, 5) comprises par le train (2) de laminoir, au moins une cage (3, 4, 5) de laminoir fonctionnant pendant le laminage du tronçon de passage en tant que cage (3, 4, 5) de laminoir à force de laminage régulée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que l'on règle la vitesse (V0) d'entrée essentiellement sur la vitesse de sortie d'un groupe (6) en amont le plus proche du train (2) de laminoir.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que l'on couple, du point de vue de la technique de fabrication, le train (2) de laminoir et au moins un groupe (6) en amont dans la direction de flux massique du train (2) de laminoir, de préférence, un groupe (6) de coulée, par le produit (G) à laminer ayant le premier et le deuxième tronçons de produits à laminer.
  4. Procédé selon la revendication 1, 2 ou 3,
    caractérisé en ce que l'on détermine le tronçon (X0, X1, X2) de passage de manière à ce qu'il ait à chaque instant pendant qu'il passe dans le train (2) de laminoir une longueur qui est au plus égale à une distance entre deux cages de laminoir voisines.
  5. Procédé selon l'une des revendications 1 à 4,
    caractérisé en ce que, lors du laminage du tronçon (X0, X1, X2) de passage, on passe continuellement d'une grandeur de processus réelle réglée sur la base de la première séquence des passes à une grandeur de processus de consigne déterminée sur la base de la deuxième séquence des passes.
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que, lors du laminage du tronçon (X0, X1, X2) de passage, on contrôle le respect d'une restriction du point de vue de la technique d'installation et, s'il est porté atteinte, aux restrictions ou si l'on s'attend à ce qu'il y soit porté atteinte on interrompt le passage du fonctionnement du train de laminoir suivant la première séquence des passes en le fonctionnement du train (2) de laminoir suivant la deuxième séquence des passes.
  7. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce que l'on règle la force de laminage et/ou l'emprise d'une cage (3, 4, 5) de laminoir la prochaine à être traversée par le tronçon (X0, X1, X2) de passage supplémentairement à la première et à la deuxième séquence des passes en fonction de la tension de feuillard entre cette cage (4, 5) de laminoir et la cage (3, 4) de laminoir en amont dans le sens du flux massique de cette cage de laminoir.
  8. Procédé selon l'une des revendications 1 à 7,
    caractérisé en ce que, pendant le passage du fonctionnement du train (2) de laminoir suivant une première séquence des passes au fonctionnement du train de laminoir suivant une deuxième séquence des passes, on fait fonctionner chaque cage (3, 4, 5) du train (2) de laminoir de manière à ce que la variation relative de la première à la deuxième épaisseur de sortie soit sensiblement constante pour chaque cage (3, 4, 5) du train (2) de laminoir.
  9. Procédé selon l'une des revendications 1 à 8,
    caractérisé en ce qu'après le passage du fonctionnement du train (2) de laminoir suivant une première séquence des passes à un fonctionnement du train (2) de laminoir suivant une deuxième séquence des passes, on effectue, pendant le laminage de la deuxième épaisseur (H3') de sortie, une re-répartition des charges des entraînements de cage de laminoir associés au train de laminoir.
  10. Procédé selon l'une des revendications 1 à 9,
    caractérisé en ce que l'on effectue une modification, nécessaire en raison de la modification de l'épaisseur (H3, H3') de sortie du train (2) de laminoir, de grandeurs de réglage d'au moins un groupe (8) en aval dans le sens du flux massique du train (2) de laminoir, pendant que le tronçon (X3) de passage est influencé par cet au moins un groupe (8).
  11. Dispositif (9) de commande et/ou de régulation d'une installation (1) de laminage, comprenant un train (2) de laminoir à plusieurs cages, comprenant un code de programme pouvant être exploité par une machine, qui a des instructions de commande, lesquelles, lors de sa réalisation, font que le dispositif (9) de commande et/ou de régulation provoque l'exécution d'un procédé selon l'une des revendications 1 à 10.
  12. Installation de laminage comprenant un train (2) de laminoir à plusieurs cages pour laminer du produit (G) à laminer métallique, comprenant un dispositif (9) de commande et/ou de régulation suivant la revendication 11, comprenant un dispositif pour envoyer la vitesse de sortie du produit (G) à laminer d'un groupe (6) en amont dans le sens du flux massique du train (2) de laminoir au dispositif (9) de commande et/ou de régulation suivant la revendication 11, les cages de laminoir (3, 4, 5) du train (2) de laminoir étant en liaison active avec le dispositif (9) de commande et/ou de régulation.
EP09736931.8A 2008-10-30 2009-10-15 Procédé de réglage d'une épaisseur de sortie d'un matériau de laminage traversant un train de laminage à plusieurs équipements, dispositif de commande et/ou de réglage et installation de laminage Active EP2346625B2 (fr)

Priority Applications (2)

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EP09736931.8A EP2346625B2 (fr) 2008-10-30 2009-10-15 Procédé de réglage d'une épaisseur de sortie d'un matériau de laminage traversant un train de laminage à plusieurs équipements, dispositif de commande et/ou de réglage et installation de laminage
PL09736931.8T PL2346625T5 (pl) 2008-10-30 2009-10-15 Sposób nastawiania grubości wylotowej materiału walcowanego przebiegającego przez wieloklatkowy zespół walcowniczy, urządzenie sterujące i/lub regulujące oraz instalacja walcownicza

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EP08018949 2008-10-30
PCT/EP2009/063508 WO2010049280A2 (fr) 2008-10-30 2009-10-15 Procédé de réglage d'une épaisseur de sortie d'un produit laminé passant à travers un train de laminage à plusieurs cages, système de commande et/ou de réglage et installation de laminage
EP09736931.8A EP2346625B2 (fr) 2008-10-30 2009-10-15 Procédé de réglage d'une épaisseur de sortie d'un matériau de laminage traversant un train de laminage à plusieurs équipements, dispositif de commande et/ou de réglage et installation de laminage

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EP2346625A2 EP2346625A2 (fr) 2011-07-27
EP2346625B1 EP2346625B1 (fr) 2013-05-29
EP2346625B2 true EP2346625B2 (fr) 2021-02-17

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EP (1) EP2346625B2 (fr)
JP (1) JP2012506776A (fr)
KR (1) KR101331324B1 (fr)
CN (1) CN102271833B (fr)
BR (1) BRPI0921435B1 (fr)
PL (1) PL2346625T5 (fr)
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EP2346625A2 (fr) 2011-07-27
KR20110079767A (ko) 2011-07-07
BRPI0921435A2 (pt) 2016-01-05
RU2477661C2 (ru) 2013-03-20
PL2346625T3 (pl) 2013-10-31
CN102271833B (zh) 2014-01-29
US20110289993A1 (en) 2011-12-01
US9314828B2 (en) 2016-04-19
PL2346625T5 (pl) 2024-04-29
KR101331324B1 (ko) 2013-11-20
WO2010049280A3 (fr) 2010-07-15
EP2346625B1 (fr) 2013-05-29
BRPI0921435B1 (pt) 2020-09-15
CN102271833A (zh) 2011-12-07
WO2010049280A2 (fr) 2010-05-06
JP2012506776A (ja) 2012-03-22
RU2011121671A (ru) 2012-12-10

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