EP4363131B1 - Verfahren zum vorheizen einer walze zum walzen - Google Patents

Verfahren zum vorheizen einer walze zum walzen

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Publication number
EP4363131B1
EP4363131B1 EP22744806.5A EP22744806A EP4363131B1 EP 4363131 B1 EP4363131 B1 EP 4363131B1 EP 22744806 A EP22744806 A EP 22744806A EP 4363131 B1 EP4363131 B1 EP 4363131B1
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EP
European Patent Office
Prior art keywords
profile
rolling
eff
target
process according
Prior art date
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Application number
EP22744806.5A
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English (en)
French (fr)
Other versions
EP4363131C0 (de
EP4363131A1 (de
Inventor
Romain-Fabrice BERNES
Daniel BELLOT
Vincent Duhoux
Clement QUESTROY
Jean-François VERDIER
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Constellium Issoire SAS
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Constellium Issoire SAS
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Publication of EP4363131A1 publication Critical patent/EP4363131A1/de
Application granted granted Critical
Publication of EP4363131C0 publication Critical patent/EP4363131C0/de
Publication of EP4363131B1 publication Critical patent/EP4363131B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B27/106—Heating the rolls
    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B21B2267/19—Thermal crown

Definitions

  • the field of the invention is that of metallurgy and more precisely that of rolling processes, preferably hot, of flat metal products made in particular from an aluminum alloy.
  • a rolling process involves shaping a metal by plastic deformation to produce flat products (sheets, strips, bands, etc.), i.e. a product whose thickness is less than its width, which is also less than its length.
  • flat products sheets, strips, bands, etc.
  • the term metal strip will be used here to refer generally to a flat product.
  • a rolling mill usually comprises one or more successive rolling stands, each formed by a pair of counter-rotating rolls known as work rolls of the same diameter.
  • the metal strip is deformed by compression as it passes between the work rolls.
  • the rolling stand may comprise another pair of rolls known as support rolls, each arranged in contact with a work roll.
  • the rolled metal strip may have flatness defects, such as non-developable defects (e.g. long edges, long centers, etc.) and developable defects (e.g. bend, tile, and twist defects, etc.). These defects may arise from the deformation of the work rolls due to the high intensity of mechanical stresses, as well as from the heterogeneous thermal expansion of the work rolls along their longitudinal axis.
  • non-developable defects e.g. long edges, long centers, etc.
  • developable defects e.g. bend, tile, and twist defects, etc.
  • the support rolls mentioned above can be used to reduce the bending of the work rolls.
  • the work rolls can have a grinding crown, or grinding profile, i.e. a variation in diameter between the center of the roll and its ends, to achieve flatness of the metal strip, for example in slight long edges or long center, depending on the rolling stand considered.
  • the rolling mill can include a thermal control device adapted to cool or heat locally the working cylinders to modify the thermal expansion profile (thermal profile).
  • the document WO00/00307A1 describes a method of hot rolling a metal strip in a rolling mill having a thermal control device.
  • the thermal control device makes it possible to modify the thermal expansion profile of the work rolls at the edge of the strip.
  • the work rolls can expand due to the heat produced in the roll, and present a concave thermal expansion profile: the diameter profile of each work roll then presents an outward rounding (bulging), which leads to an increase in the thickness of the metal strip at its lateral edges. Note that, in this example, the work rolls do not present a grinding profile.
  • the thermal control device includes lateral inductors arranged opposite each working roll at the edge of the strip.
  • the activation of the lateral inductors makes it possible to modify the thermal expansion profile and more precisely to increase the thermal expansion of the working rolls at the edge of the metal strip, thus reducing the local excess thickness of the latter.
  • the document FR2375920 describes another example of a rolling mill comprising a thermal control device with inductors.
  • the inductors are regularly distributed along the longitudinal axis of the work rolls.
  • the thermal control device also comprises a downstream roller for measuring the distribution of mechanical stresses in tension present in the rolled metal strip, as well as a downstream sensor for measuring the thickness distribution of the rolled metal strip.
  • a feedback loop is provided to adapt the thermal power delivered by each inductor according to the measurement signals emitted by the downstream roller and the downstream sensor.
  • this method leads to a loss of material since, on the one hand, the thermal profile of the work rolls may not be stabilized during the rolling of the metal strip, and on the other hand, any defects are detected after the metal strip has passed through the roll clearance.
  • the thermal control device comprises nozzles for spraying a heating liquid (heating sprays) and nozzles for spraying a cooling liquid (cooling sprays), distributed along the longitudinal axis of the work rolls.
  • the thermal control device further comprises multiple sensors for measuring the surface temperature of the work roll as well as the thermal expansion of the latter. The measured values can be compared with those calculated by a predefined thermal model, to then control the thermal power delivered by each of the heating and cooling sprays.
  • this method requires the use of multiple sensors, including sensors for measuring the surface temperature of the work rolls.
  • US 2017/080467 A1 describes a method for preheating at least one working roll of a rolling mill intended to roll a metal strip so that the working roll has a target thermal expansion profile determined along Ns longitudinal segments of the working roll, the rolling mill comprising a thermal control device comprising Ni inductor spray nozzles distributed along the longitudinal axis of the working roll opposite the Ns longitudinal segments, the method comprising determining the target thermal expansion profile at a calculation time, from i) predefined values of input parameters representative of the dimensions and mechanical and thermal properties of the metal strip to be rolled, and ii) a first predefined physical model expressing a relationship between the input parameters Pe and the target thermal expansion profile.
  • the invention aims to remedy at least in part the drawbacks of the prior art, and more particularly to propose a method for preheating at least one of the working rolls of a rolling stand making it possible to expand the working roll according to a predefined target thermal expansion profile, quickly and efficiently, without it being necessary to use different types of measuring sensors.
  • Target thermal expansion profiles ⁇ d i c 1 ⁇ i ⁇ Ns , of effective average temperature T ⁇ i eff t k 1 ⁇ i ⁇ Ns , and target average temperature T ⁇ i c t k 1 ⁇ i ⁇ Ns can be determined for the longitudinal segments intended to be in contact with the metal strip to be rolled.
  • An inductor of index j can only be activated when the ratio ⁇ T (j) (t k )/ ⁇ T (jmax) (t k ) is greater than or equal to a predefined threshold value R T , otherwise it remains inactive.
  • the thermal control device may comprise coolers distributed along the longitudinal axis of the working cylinder opposite the Ns longitudinal segments.
  • the method may comprise a step of activating the coolers from the difference ⁇ T (t k ) between the target mean temperature profile T ⁇ i c t k 1 ⁇ i ⁇ Ns and the effective mean temperature profile T ⁇ i eff t k 1 ⁇ i ⁇ Ns .
  • the phase of determining the effective average temperature profile T ⁇ i eff t k 1 ⁇ i ⁇ Ns can be carried out by numerical simulation, the working cylinder being discretized according to a 2D axisymmetric mesh.
  • the metal strip can be made of an aluminum alloy.
  • the invention relates to a method for preheating at least one working roll of a rolling stand, making it possible to thermally expand the working roll locally, according to a predetermined target profile, before the metal strip to be rolled is introduced into the grip.
  • the metal strip is made from aluminum, without the invention being limited to this type of material.
  • the target thermal expansion profile of preheating takes into account the characteristics of the metal strip to be rolled, and corresponds substantially to that generated during the actual rolling operation, by the heat input resulting mainly from the deformation of the metal strip in the roll. Also, at the end of the preheating operation, the work roll then has a thermal stability close to or substantially identical to what it will be during the rolling operation.
  • the target thermal expansion profile is predefined so that, during the rolling operation, the rolled metal strip has, at the exit of the grip, the desired thickness profile and flatness.
  • the profile of a physical quantity associated with the working cylinder is the variation (or distribution) of this physical quantity along the longitudinal axis of the cylinder.
  • the profile of the metal strip is the variation (or distribution) of thickness in a cross-section along a transverse axis (width direction) of the metal strip.
  • FIG. 1A is a schematic and partial view of a rolling mill 1 comprising several successive rolling stands 10, in section along the longitudinal axis of the rolling mill. Here only one rolling stand 10 is shown.
  • the Figure 1B is a schematic and partial view of the rolling stand 10, in section along the longitudinal axis of the working cylinder.
  • a direct three-dimensional orthogonal reference frame XYZ is defined, where the X axis is oriented along the rolling direction and corresponds to the longitudinal axis of the rolling mill 1 and of the metal strip 2 being rolled, the Y axis corresponds to the longitudinal axis of the cylinders, and the Z axis is oriented along the height of the rolling stand 10.
  • the terms 'upstream' and 'downstream' are defined with reference to the longitudinal axis of the rolling mill 1, i.e. here to the X axis.
  • the rolling mill 1 may comprise several successive rolling stands 10 for rolling the same metal strip 2. It also comprises a thermal control device 20 adapted to control the thermal expansion profile of at least one of the working rolls 11 by means of a plurality of inductors 21 and possibly coolers 22.
  • Each rolling stand 10 is here of the 'quarto' type and comprises here a pair of working rolls 11 (lower and upper rolls), and a pair of support rolls 12 (lower and upper). Of course, other configurations are possible, such as 'sexto' or 'Sendzimir' type stands, among others.
  • Each working roll 11 of the rolling stands 10 can be equipped with inductors 21 and possibly coolers 22 of the thermal control device 20.
  • the rolling mill 1 can however comprise, upstream of the rolling stands 10, at least one reversible stand not equipped with inductors of the thermal control device.
  • the thermal control device 20 comprises a plurality of inductors 21 and possibly a plurality of coolers 22, connected to a processing unit 23. It makes it possible to generate, within the framework of the preheating of the working cylinder 11 considered, and therefore before the rolling operation, a thermal expansion profile for the working cylinder 11 considered which is substantially equal to a predetermined target profile.
  • the working cylinder 11 is discretized over its entire length, along the longitudinal axis Y, into Ns successive longitudinal segments 11s, preferably of the same dimension.
  • the working cylinder 11 can be discretized into several longitudinal segments 11s of width equal to approximately 20 mm along the Y axis.
  • the thermal control device 20 comprises Ni inductors 21, with here Ni ⁇ Ns. They are distributed along the longitudinal axis Y opposite the Ns successive longitudinal segments, here at a rate of 1 inductor for several successive longitudinal segments 11s. Not all the longitudinal segments 11s necessarily comprise inductors 21, in particular the longitudinal segments 11s located at the edge of the working cylinder 11 and which are not intended to form the grip (no contact with the metal strip 2).
  • the inductors 21 can be placed upstream and/or downstream of the working cylinder 11. In this example, Ni inductors are located upstream and Ni inductors are located downstream of the working cylinder 11.
  • the inductors 21 are adapted to transmit thermal energy into the longitudinal segments 11s of the working cylinder 11. This involves electromagnetic induction heating, in the sense that each inductor 21 generates a magnetic field which induces an alternating electric current in the longitudinal segment(s) 11s opposite which it is arranged. The electromagnetic power received by the longitudinal segments 11s is converted by the Joule effect into heat power, which thus leads to an increase in the average temperature of the longitudinal segments 11s concerned.
  • the inductors 21 are activated and deliver thermal power in response to a control signal from the control unit 23 which defines a target value of the thermal power. However, it appears that the inductors 21 may not actually deliver the target value of the thermal power. Also, they each comprise a sensor (not represented) adapted to provide the processing unit 23 with a measurement of the thermal power actually delivered.
  • the thermal control device 10 may also comprise coolers 22, distributed along the working cylinder 11. Each cooler 22 may be a nozzle for spraying a coolant. These coolers 22 thus make it possible to reduce the average temperature of the longitudinal segments 11s of the working cylinder. They may be more or less numerous than the inductors 21. In addition, the longitudinal arrangement of the coolers 22 may not coincide with that of the inductors 21.
  • the processing unit 23 is adapted to carry out calculations at different successive calculation times t k , and to control the inductors 21 and where appropriate the coolers 22 so that the effective average temperature profile of the longitudinal segments 11s (and therefore the effective thermal expansion profile) is substantially equal to the target average temperature profile (and therefore to a target thermal expansion profile).
  • the processing unit 23 comprises a programmable processor capable of executing instructions recorded in an information recording medium. It further comprises a memory containing the instructions necessary for implementing the preheating method. It is also adapted to store the information calculated at each calculation instant t k . It also implements two predefined physical models M1 and M2.
  • the first predefined physical model M1 expresses a relationship between, on the one hand, input parameters Pe representative of dimensions and mechanical and thermal properties of the metal strip 2 to be rolled, and on the other hand, a target thermal expansion profile of the working cylinder defined at the level of the Ns longitudinal segments 11s.
  • the predefined physical model M1 can be a database (abacus) obtained previously, for example experimentally and/or numerically.
  • the predefined physical model M1 establishes a relationship between the target thermal expansion profile necessary to obtain these properties of the metal strip 2, and the input parameters Pe.
  • the input parameters Pe relate in particular to the mechanical characteristics of the metal strip 2 to be rolled such as the type of aluminum alloy, the thermal characteristics such as the temperature of the metal strip 2 at the inlet of the rolling stand 10 and the desired winding temperature, the dimensions of the metal strip 2 to be rolled such as its width W, the initial thickness H and the output thickness h. Other characteristics can be taken into account.
  • These input parameters Pe make it possible to estimate the rolling force and therefore the heat produced in the grip during the rolling of the metal strip 2, as well as the bending of the working rolls under the mechanical force, these thermal and mechanical expansions being intended to be compensated by the preheating method according to the invention.
  • the target thermal expansion profile corresponds to the distribution along the longitudinal axis Y of the local variation ⁇ d th (y) in diameter of the working roll 11 due to a temperature variation ⁇ T between two successive calculation times t k . It is therefore a variation in diameter relative to the reference profile d ref (y), whether or not it includes the grinding component ⁇ d rec (y).
  • the target thermal expansion profile is independent of the calculation time t k , and is determined at the start of the preheating process (it can however be adjusted according to the thermal state of the preceding rolling mills (e.g. roughing stand).
  • ⁇ d th c y when the profile is defined along the continuous abscissa y along the longitudinal axis Y, and is noted ⁇ d th i c 1 ⁇ i ⁇ Ns or more simply ⁇ d th c (vector of Ns values) when defined along the Ns longitudinal segments 11s.
  • the Figure 2A illustrates a schematic and partial view, in section along the longitudinal axis Y, of a working cylinder 11 having a thermal expansion profile ⁇ d th (y).
  • the thermal expansion profile ⁇ d th c y corresponds to the deviation from the reference profile d ref (y).
  • the reference profile d ref (y) is constant (no rectification component).
  • the thermal expansion profile ⁇ d th c y is not to scale to favor clarity of the figure.
  • FIG. 2B illustrates an example of a target thermal expansion profile ⁇ d th (y) of a working cylinder 11 determined by the predefined physical model M1, highlighting the parameters making it possible to characterize such a profile, the values of these parameters being stored in the predefined physical model M1.
  • These parameters are denoted here A, B, u and xx.
  • A is equal to 0.2mm
  • B is equal to 0.18mm
  • xx to 500mm u to 400mm
  • Pe for a set of predefined input parameters Pe, including a width W of the metal strip 2 to be rolled equal to 2000mm.
  • the target thermal expansion profile ⁇ d th (y) is here a parabola over a distance W/2-xx from the center of the working cylinder 11 along the longitudinal axis Y (more precisely from the center of the cylinder table 11), with an amplitude A at the center, and an amplitude B at the abscissa xx. Then, between the position xx and the end of the cylinder table, the profile has a decrease given by a function erf.
  • the parameter u makes it possible to calculate the abscissa W/2-xx+u from the center of the cylinder table for which the profile is B/2.
  • these parameters are given for illustrative purposes and other parameters can be used to characterize the target thermal expansion profile.
  • the predefined physical model M1 may in particular provide for an update of the values of the parameters A, B, xx and u as a function of the amplitude of the thermal expansion profile of the working rolls 11 of the reversible stand.
  • the value of this amplitude is known and is subtracted from the value of the parameter A.
  • the reversible stand is an upstream stand which is not thermally controlled by the thermal control device 20, in the sense that it does not comprise inductors 21. On the other hand, it comprises coolers 22 here.
  • the processing unit 23 performs its discretization according to the Ns longitudinal segments 11s.
  • the predefined physical model M2 expresses, for each calculation instant t k , a relationship between a measured profile of effective thermal power P Q i eff t k 1 ⁇ i ⁇ N and an effective mean temperature profile T ⁇ i eff t k 1 ⁇ i ⁇ N of the working cylinder 11. Subsequently, we use the vector notation for these profiles: P Q eff t k And T eff (t k ), where the vectors have Ni and Ns values respectively.
  • the effective thermal power profile P Q eff t k corresponds to the measurements made by the sensors of the Ni inductors 21 at the calculation time t k and transmitted to the processing unit 23. From these measurements, the predefined physical model M2 determines the thermal energy average received by the longitudinal segments 11s considered between the two consecutive calculation times.
  • the predefined physical model M2 can be a database (abacus) obtained previously for example experimentally and/or numerically.
  • the effective mean temperature profile T eff (t k ) corresponds to the average temperature of the Ns longitudinal segments 11s at the calculation time t k , and depends in particular on the average thermal energy received from the inductors 21 (and where appropriate the average thermal energy lost due to the coolers 22), and therefore on the measured profile of effective thermal power P Q eff t k .
  • This is an average temperature of the longitudinal segments 11s of the working cylinder 11, and not just the average temperature of the surface of the cylinder 11 in the longitudinal segments 11s. The average temperature is therefore constant at any point in the volume of each longitudinal segment 11s considered.
  • the effective mean temperature profile T eff (t k ) is here determined by means of numerical simulation software by solving the predefined physical model M2 where the working cylinder 11 is discretized into an axisymmetric mesh, where the meshes are formed along the longitudinal axis Y of the Ns longitudinal segments 11s. It may preferably be a 1D axisymmetric mesh where each mesh corresponds to a longitudinal segment, or even a 2D axisymmetric mesh, i.e. along the longitudinal axis Y (longitudinal segments) and along a radial axis.
  • the predefined physical model M2 is a physical model that performs a balance of incoming and outgoing heat flows, and takes into account thermal diffusion along the longitudinal axis Y.
  • the predefined physical model M2 (e.g. 2D axisymmetric model) is solved by numerical simulation, for example in finite differences, and makes it possible to determine the effective average temperature profile T eff (t k ) of the Ns longitudinal segments.
  • FIG 3 illustrates a flowchart of a method for preheating a working roll 11 of a rolling mill 1 according to one embodiment.
  • the method can concern the two working rolls 11 of the rolling stand considered, as well as all the rolling stands of the rolling mill 1.
  • the method is implemented before the actual rolling operation of the metal strip 2, and stops when the rolling operation begins. Preheating can, however, be activated again when the convergence criterion mentioned below is no longer verified.
  • the preheating process comprises a preliminary phase 10 of determining the target thermal expansion profile ⁇ d c of the working cylinder, followed by several phases carried out at each calculation instant t k , namely a phase 20 of determining the effective average temperature profile T eff (t k ) of the working cylinder, a phase 30 of determining the target average temperature profile T c (t k ) of the working cylinder, then, based on a deviation between the two average temperature profiles T eff (t k ) and T c (t k ) determined, of an activation phase or not of the inductors on the basis of a target thermal power profile P Q eff t k having been determined.
  • the working cylinder 11 is discretized into Ns longitudinal segments 11s, and the thermal control device 20 comprises Ni inductors 21 distributed along the longitudinal axis Y, with here Ns ⁇ Ni.
  • the coolers 22 that the thermal control device 20 may comprise are not taken into account.
  • Phase 10 Determination of a target thermal expansion profile ⁇ d th i c 1 ⁇ i ⁇ Ns of the working cylinder 11. We subsequently use vector notation ⁇ d th c .
  • input parameters Pe are defined, representative of the mechanical characteristics of the metal strip 2 to be rolled, such as the type of aluminum alloy, thermal characteristics such as the temperature of the metal strip at the inlet of the rolling stand and the desired winding temperature, and the dimensions of the metal strip 2 to be rolled, such as its width W, the initial thickness H and the outlet thickness h.
  • the processing unit 23 determines the target thermal expansion profile ⁇ d th c from the defined input parameters Pe and by means of the predefined physical model M1 implemented in the memory of the processing unit 23.
  • step 13 the target thermal expansion profile is discretized ⁇ d th c y on the Ns longitudinal segments 11s, to obtain the profile ⁇ d th i c 1 ⁇ i ⁇ Ns (note ⁇ d th c ).
  • thermal expansion profile ⁇ d th c can only be defined for the longitudinal segments 11s intended to be in contact with the metal strip 2, that is to say here for the longitudinal segments 11s with index ranging from iwi to iwf.
  • each iteration of rank k is associated with a calculation instant t k also called the current instant.
  • Phase 20 Determination of an effective mean temperature profile T ⁇ i eff t k 1 ⁇ i ⁇ Ns (and noted T eff (t k )) of the Ns longitudinal segments 11s of the working cylinder 11.
  • step 21 the effective average temperature profile is determined T eff (t k ) of the working cylinder 11.
  • T eff (t k ) of the working cylinder 11 is the average temperature of each longitudinal segment 11s of the working cylinder 11 (constant temperature on the surface and in the volume of the longitudinal segment), and not just the surface temperature. This average temperature is responsible for the (average) thermal expansion of the longitudinal segment 11s considered.
  • This profile is determined from an effective thermal power profile P Q i eff t k ⁇ 1 1 ⁇ i ⁇ Ni (and noted in a vector manner P Q eff t k delivered by the inductors 21 and previously measured by the sensors of the inductors 21 at the calculation instant t k-1 , and by means of the second predefined physical model M2 expressing a relationship between the effective thermal power profile P Q eff t k and the effective mean temperature profile T eff (t k ).
  • Phase 30 Determination of a target average temperature profile T ⁇ i c t k 1 ⁇ i ⁇ Ns (and noted T c (t k )) of the Ns longitudinal segments 11s of the working cylinder 11.
  • the target average temperature profile is determined T c (t k ) of the Ns longitudinal segments 11s of the working cylinder 11, from the effective average temperature profile T eff (t k ) and the target thermal expansion profile ⁇ d th c .
  • T c (t k ) of the Ns longitudinal segments 11s of the working cylinder 11, from the effective average temperature profile T eff (t k ) and the target thermal expansion profile ⁇ d th c .
  • d ref (j) is the reference diameter at index j
  • ⁇ is the average thermal expansion coefficient of the working cylinder 11.
  • Phase 40 determination of a deviation ⁇ T (t k ) between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ).
  • a maximum deviation ⁇ is determined here T (jmax) (t k ) between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ).
  • the objective here is to identify the inductor 21 closest to this longitudinal segment of index jmax whose target thermal power will be brought to a maximum value.
  • Phase 50 convergence criterion
  • a convergence criterion is determined in which a deviation Ec(t k ) representative of the deviation ⁇ is compared to a predefined threshold value ⁇ T (t k ) between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ).
  • This deviation Ec(t k ) is therefore also representative of the deviation between the target thermal expansion profile ⁇ d c (t k ) and the actual thermal expansion profile ⁇ d eff (t k ).
  • the deviation Ec(t k ) can be defined in different ways. It can be the local maximum value ⁇ T (jmax) (t k ) between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ). It can also be a point-by-point comparison between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ), for example an average or a possibly weighted sum of the difference in absolute value between these two profiles. It can also be an activation duration of the inductor 21 associated with the longitudinal segment of index jmax, that is to say the one for which the temperature difference ⁇ T (jmax) (t k ) is maximal.
  • the convergence criterion is considered to be verified when the deviation Ec(t k ) is less than or equal to the threshold value ⁇ , in which case the preheating of the working roll(s) is considered to be complete (step 70). Information can then be given to the user of the rolling mill 1, for example the deviation Ec(t k ) in question, or information on the remaining heating time (ratio between the temperature deviation and the thermal power injected).
  • the convergence criterion is considered not to be verified when the deviation Ec(t k ) is greater than the threshold value ⁇ , in which case the preheating process continues with phase 60.
  • phase 50 is carried out here between phases 40 and 60, but it can obviously be carried out at other times in the process, for example after phase 60. In the case where the convergence criterion is not verified, we continue with phase 60.
  • Phase 60 Determination of a target thermal power profile P Q i c t k 1 ⁇ i ⁇ Ni (and noted P Q c t k ) and activation of the inductors accordingly.
  • the target thermal power profile is determined.
  • P Q c t k to be delivered by the inductors 21 It is therefore possible to provide for activating only the inductors 21 intended to be opposite the metal strip during the rolling operation, i.e. those located opposite the longitudinal segments 11s with indices between iwi and iwf.
  • the target thermal power of the inductor 21 with index jmax is defined at 100% of the maximum thermal power P Q,max .
  • the target thermal power is then defined P Q j eff t k to be delivered by the other inductors 21 of index j as being equal to the maximum thermal power P Q,max modulated by the ratio ⁇ T (j) (t k )/ ⁇ T (jmax) (t k ).
  • an activation threshold can be taken into account: thus, when the ratio ⁇ T (jmax) (t k )/ ⁇ T (jmax) (t k ) is lower than a predefined threshold R T , the inductor 21 of index j considered is not activated.
  • a predefined threshold R T a predefined threshold
  • a control signal is transmitted by the processing unit 23 to the inductors 21 so that they deliver a target thermal power P Q c t k .
  • the inductors 21 activate or not and deliver (or attempt to deliver) the determined target thermal power.
  • a control signal can be transmitted to the coolers 22 when the local effective average temperature is higher than the local target average temperature, so as to reduce the corresponding deviation.
  • each sensor of the inductors 21 measures the thermal power P Q j eff t k actually delivered, here simultaneously with their operation, and transmits the measured value to the processing unit 23. These values thus form an effective thermal power profile P Q eff t k .
  • this phase 60 may not have been carried out, and the information is given to the operator of rolling mill 1 that the effective average temperature profile T eff (t k ) has converged to the target mean temperature profile T c (t k ), and therefore that the effective thermal expansion profile ⁇ d th eff t k converged to the target thermal expansion profile ⁇ d th c t k .
  • the rolling operation of the metal strip 2 can therefore start and the inductors 21 can be deactivated, immediately (or not), to the extent that the heat produced by the rolling of the metal strip 2 in the grip will cause a thermal expansion of the working cylinder 21 corresponding to the target profile target thermal expansion ⁇ d th c .
  • the preheating method according to the invention makes it possible to preheat the working cylinder(s) 11 simply and efficiently before the actual rolling of the metal strip 2 is carried out.
  • the use of inductors 21 and a predefined physical model M2 receiving the measurements of the effective thermal power of the inductors 21 make it possible to quickly and precisely modify the effective average temperature profile so that it tends towards the target average temperature profile.
  • the inductors 21 modify the average surface and volume temperature of the longitudinal segments 11s, and not only the surface temperature like the spray nozzles of a heating liquid, which makes it possible to use a simplified predefined physical model M2, for example a 2D axisymmetric type model, which directly determines the average temperature of the longitudinal segments of the working cylinder without going through the measurement of the surface temperature.
  • a simplified predefined physical model M2 for example a 2D axisymmetric type model, which directly determines the average temperature of the longitudinal segments of the working cylinder without going through the measurement of the surface temperature.
  • the physical model needs to be more complex and must determine the average temperature from the measurement of the surface temperature (hence the use of dedicated sensors).
  • the injected thermal power is transmitted directly into the longitudinal segments of the working cylinder, without an exchange coefficient, since there is heating by the Joule effect of the induced eddy currents.
  • a heating liquid water for example
  • energy efficiency is impacted by the exchange coefficient, and the maximum heating is limited by the boiling temperature of the liquid.
  • the thermal control device may comprise coolers distributed along the longitudinal axis Y of the working cylinder, and the processing unit may transmit a control signal to the coolers on the basis of the difference ⁇ T (t k ) between the target mean temperature profile T c (t k ) and the effective mean temperature profile T eff (t k ).
  • the metal strip comprises an aluminum alloy, preferably the aluminum alloy is an alloy chosen, according to the designation of the aluminum association, from the alloy AA2014, AA2017, AA2024, AA2027, AA2046, AA2050, AA2056, AA2060, AA2074, AA2098, AA2139, AA2195, AA2198, AA2214, AA2219, AA2519, AA2524, AA2618, AA2654, AA3003, AA3004, AA3005, AA3103, AA3104, AA3105, AA5005, AA5049, AA5050, AA5052, AA5083, AA5086, AA5088, AA5150, AA5154, AA5182, AA5186, AA5200, AA5251, AA5252, AA5254, AA5383, AA5454, AA5456, AA5657, AA5754, AA6016,
  • the metal strip is a clad aluminum alloy.
  • the aluminum alloy is clad on at least one face, preferably two faces, with a 1000 series alloy depending on the aluminum combination, preferably the AA1050 alloy or with the AA7072 alloy.
  • the central portion of the clad aluminum is the AA2024 or AA2524 alloy and the cladding is a 1000 series alloy, preferably AA1050.
  • the central portion of the clad aluminum is the AA7075, AA7175 or AA7475 alloy and the cladding is the AA7072 alloy.
  • Clad aluminum alloys are known as clad product in NF EN 12258-1.
  • the rolling of the metal strip is hot rolling.
  • the hot rolling is carried out with a rolling mill which is part of a plurality of hot rolling mills operating in tandem, preferably preceded by a reversible hot rolling mill.
  • the temperature of the aluminum alloy, optionally clad, before its hot rolling is at least 350°C and at most 510°C or 490°C or 470°C or 450°C or 430°C or 410°C or 390°C or 370°C. In another embodiment, the temperature of the aluminum alloy, optionally clad, before its hot rolling is at least 370°C and at most 510°C or 490°C or 470°C or 450°C or 430°C or 410°C or 390°C.
  • the temperature of the aluminum alloy, optionally clad, before its hot rolling is at least 390°C and at most 510°C or 490°C or 470°C or 450°C or 430°C or 410°C. In another embodiment, the temperature of the aluminum alloy, optionally clad, before its hot rolling is at least 410°C and at most 510°C or 490°C or 470°C or 450°C or 430°C. In another embodiment, the temperature of the aluminum alloy, optionally clad, before its hot rolling is at least 430°C and at most 510°C or 490°C or 470°C or 450°C.
  • the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 450°C and at most 510°C or 490°C or 470°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 470°C and at most 510°C or 490°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 490°C and at most 510°C.
  • the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 230°C and at most 370°C or 350°C or 330°C or 310°C or 290°C or 270°C or 250°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 250°C and at most 370°C or 350°C or 330°C or 310°C or 290°C or 270°C. In another embodiment, the temperature of the aluminum alloy, optionally clad, after its hot rolling is at least 270°C and at most 370°C or 350°C or 330°C or 310°C or 290°C.
  • the temperature of the aluminum alloy, optionally clad, after its hot rolling is at least 290°C and at most 370°C or 350°C or 330°C or 310°C. In another embodiment, the temperature of the aluminum alloy, optionally clad, after its hot rolling is at least 310°C and at most 370°C or 350°C or 330°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 330°C and at most 370°C or 350°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 350°C and at most 370°C.
  • the surface temperature of the preheated work roll is at least 200°C and at most 320°C or 300°C or 280°C or 260°C or 240°C or 220°C. In another embodiment, the surface temperature of the rolls during hot rolling is at least 220°C and at most 320°C or 300°C or 280°C or 260°C or 240°C. In another embodiment, the surface temperature of the rolls during hot rolling is at least 240°C and at most 320°C or 300°C or 280°C or 260°C. In another embodiment, the temperature of the surface rolls during hot rolling is at least 260°C and at most 320°C or 300°C or 280°C. In another embodiment, the temperature of the surface rolls during hot rolling is at least 280°C and at most 320°C or 300°C. In another embodiment, the temperature of the surface rolls during hot rolling is at least 300°C and at most 320°C. In another embodiment, the temperature of the surface rolls during hot rolling is at least 300°C and at
  • the rolling of the metal strip is cold rolling.
  • the cold rolling is carried out with a rolling mill which is part of a plurality of cold rolling mills operating in tandem.
  • the surface temperature of the preheated work roll is at least 100°C and at most 200°C or 180°C or 160°C or 140°C or 120°C. In another embodiment, the surface temperature of the rolls during cold rolling is at least 120°C and at most 200°C or 180°C or 160°C or 140°C. In another embodiment, the surface temperature of the rolls during cold rolling is at least 140°C and at most 200°C or 180°C or 160°C. In another embodiment, the surface temperature of the rolls during cold rolling is at least 160°C and at most 200°C or 180°C. In another embodiment, the surface temperature of the rolls during cold rolling is at least 180°C and at most 200°C.
  • the two working rolls, with a diameter of 700 mm, of a hot rolling mill were each equipped with 33 inductors of 80 mm depending on the length of said rolls.
  • the working rolls were discretized into segments of 20 mm in length for the implementation of the preheating process according to the invention.
  • the use of the roll preheating process made it possible to eliminate the use of starting metal strips to stabilize the thermal profile necessary for hot rolling aluminum alloys. This improvement concerns in particular the alloys AA5083, AA5086, AA5088, AA5182, AA5052, AA5754, AA2098, AA2198, AA2195, AA2024 and AA2524.
  • This improvement also applies to clad aluminum alloys with the core being AA2024 or AA2524 aluminum alloy and the cladding being AA1050. This improvement also applies to clad aluminum alloys with the core being AA7075 or AA7175 aluminum alloy and the cladding being AA7072.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (15)

  1. Verfahren zum Vorwärmen mindestens einer Arbeitswalze (11) eines Walzwerks (1) zum Walzen eines Metallbandes (2), damit die Arbeitswalze (11) ein Ziel-Wärmeausdehnungsprofil aufweist, das entlang Ns Längssegmenten der Arbeitswalze Δd i c 1 ≤ i ≤ Ns bestimmt ist, wobei das Walzwerk (1) eine Vorrichtung zur Prüfung der Wärme (20) aufweist, die Ni Induktoren (21) aufweist, die entlang der Längsachse der Arbeitswalze (11) gegenüber den Ns Längssegmenten (11s) verteilt sind, wobei das Verfahren folgende Phasen umfasst:
    a. Bestimmung (10) des Ziel-Wärmeausdehnungsprofils Δd i c 1 ≤ i ≤ Ns zu einem Berechnungszeitpunkt tk,
    • ausgehend von vordefinierten Werten von Eingangsparametern Pe, die die Abmessungen und die thermischen und mechanischen Eigenschaften des zu walzenden Metallbands repräsentieren,
    • und ein erstes vordefiniertes physikalisches Bezugsformstück M1, das eine Beziehung zwischen den Eingangsparametern Pe und dem Ziel-Wärmeausdehnungsprofil Δd i c 1 ≤ i ≤ Ns ausdrückt;
    b. Bestimmung (20) eines effektiven mittleren Temperaturprofils T ¯ i eff t k 1 ≤ i ≤ Ns entlang Ns Längssegmenten der Arbeitswalze,
    • ausgehend von einem effektiven Wärmeleistungsprofil, das von den Ni Induktoren erzeugt und zuvor P Q i eff t k − 1 1 ≤ i ≤ Ni gemessen wurde,
    • und ein zweites vordefiniertes physikalisches Modell M2, das ein Verhältnis zwischen dem effektiven Wärmeleistungsprofil P Q i eff t k 1 ≤ i ≤ Ni und dem effektiven mittleren Temperaturprofil T ¯ i eff t k 1 ≤ i ≤ Ns ausdrückt;
    c. Bestimmung (30) eines mittleren Ziel-Temperaturprofils T ¯ i c t k 1 ≤ i ≤ Ns entlang der Ns Längssegmente der Arbeitswalze, ausgehend von dem Δd i c t k 1 ≤ i ≤ Ns bestimmten Ziel-Wärmeausdehnungsprofil und dem T ¯ i eff t k 1 ≤ i ≤ Ns bestimmten effektiven mittleren Temperaturprofil;
    d. Bestimmung (40) einer Abweichung zwischen ΔT(tk) dem mittleren Ziel-Temperaturprofil T ¯ i c t k 1 ≤ i ≤ Ns T ¯ i eff t k 1 ≤ i ≤ Ns und dem effektiven mittleren Temperaturprofil;
    e. Bestimmung (50) eines Konvergenzkriteriums ausgehend von der ΔT(tk) ermittelten Abweichung und Stoppen des Vorwärmens (70), wenn das Konvergenzkriterium überprüft ist, und Fortsetzen der Phasen des Vorwärmens, wenn das Konvergenzkriterium nicht überprüft ist;
    f. Aktivierung (60) der Induktoren, die folgende Schritte umfasst:
    • Bestimmung eines von den Ni Induktoren P Q i c t k 1 ≤ i ≤ Ni zu liefernden thermischen Zielleistungsprofils ausgehend von der ΔT(tk) bestimmten Abweichung;
    • Aktivierung der Induktoren, so dass sie das bestimmte thermische Zielleistungsprofil P Q i c t k 1 ≤ i ≤ Ni liefern;
    • Messung eines effektiven Wärmeleistungsprofils, das von den Induktoren tatsächlich P Q i eff t k 1 ≤ i ≤ Ni abgegeben wird;
    g. Wiederholung der Schritte b/ bis f/, bis das Konvergenzkriterium überprüft ist, indem der Berechnungszeitpunkt tk erhöht wird.
  2. Verfahren zum Vorwärmen nach Anspruch 1, wobei die Ziel-Wärmeausdehnungsprofile Δd i c 1 ≤ i ≤ Ns , der effektiven mittleren Temperatur T ¯ i eff t k 1 ≤ i ≤ Ns und der mittleren Zieltemperatur für die Längssegmente bestimmt T ¯ i c t k 1 ≤ i ≤ Ns werden, die dazu bestimmt sind, mit dem zu walzenden Metallband (2) in Kontakt zu stehen.
  3. Verfahren zum Vorwärmen nach Anspruch 1 oder 2, wobei der Schritt zur Bestimmung des thermischen Zielleistungsprofils folgende Schritte P Q i c t k 1 ≤ i ≤ Ni umfasst:
    • Identifizierung des Längssegments mit dem Index jmax, für das die Abweichung am höchsten ΔT (jmax)(tk) ist, und Festlegung der thermischen Zielleistung P Q jmax c t k auf einen maximalen Wert;
    • Bestimmung der thermischen Zielleistung der weiteren Längssegmente wie P Q j c t k = P Q jmax c t k × Δ T ¯ j t k / Δ T ¯ jmax t k .
  4. Verfahren zum Vorwärmen nach Anspruch 3, wobei ein Induktor (21) mit Index j nur aktiviert wird, wenn das Verhältnis größer oder gleich einem vorgegebenen Schwellenwert RT ΔT (j)(tk)/ΔT (jmax)(tk) ist, andernfalls bleibt er inaktiv.
  5. Verfahren zum Vorwärmen nach einem der Ansprüche 1 bis 4, wobei die Vorrichtung zur thermischen Prüfung (20) Kühler (23) umfasst, die entlang der Längsachse der Arbeitswalze (11) gegenüber den Ns Längssegmenten (11s) verteilt sind, und umfassend einen Schritt zur Aktivierung der Kühler (23) ausgehend von der Differenz zwischen ΔT(tk) dem mittleren Ziel-Temperaturprofil T ¯ i c t k 1 ≤ i ≤ Ns T ¯ i eff t k 1 ≤ i ≤ Ns und dem effektiven mittleren Temperaturprofil.
  6. Verfahren zum Vorwärmen nach einem der Ansprüche 1 bis 5, wobei die Phase der Bestimmung des effektiven mittleren Temperaturprofils durch numerische Simulation durchgeführt T ¯ i eff t k 1 ≤ i ≤ Ns wird, wobei die Arbeitswalze (11) nach einem 2D-Achsennetz diskretisiert sind.
  7. Verfahren zum Vorwärmen nach einem der Ansprüche 1 bis 6, wobei das Metallband (2) aus einer Aluminiumlegierung hergestellt ist.
  8. Walzverfahren mit folgenden Schritten
    a. Vorwärmen mindestens einer Arbeitswalze, vorzugsweise der beiden Arbeitswalzen, eines Walzwerks, das dazu bestimmt ist, ein Metallband nach dem Verfahren nach einem der Ansprüche 1 bis 7 zu walzen,
    b. das Walzen des Metallbandes mit der mindestens so vorgewärmten Arbeitswalze, vorzugsweise den beiden Arbeitswalzen.
  9. Walzverfahren nach Anspruch 8, dadurch gekennzeichnet, dass das Metallband eine Aluminiumlegierung umfasst, vorzugsweise ist die Aluminiumlegierung eine Legierung, die aus der Legierung AA2014, AA2017, AA2024, AA2027, AA2046, AA2050, AA2056, AA2060, AA2074, AA2098, AA2139, AA2195, AA2198, AA2214, AA2219, AA2519, AA2524, AA2618, AA2654, AA3003, AA3004, AA3005, AA3103, AA3104, AA3105, AA5005, AA5049, AA5050, AA5052, AA5083, AA5086, AA5088, AA5150, AA5154, AA5182, AA5186, AA5200, AA5251, AA5252, AA5254, AA5383, AA5454, AA5456, AA5657, AA5754, AA6016, AA6056, AA6060, AA6061, AA6063, AA6082, AA6156, AA6182, AA6909, AA7010, AA7011, AA7017, AA7019, AA7020, AA7021, AA7022, AA7039, AA7040, AA7049, AA7050, AA7056, AA7072, AA7075, AA7079, AA7099, AA7122, AA7150, AA7175, AA7178, AA7449, AA7450 oder AA7475 ausgewählt ist.
  10. Walzverfahren nach Anspruch 9, dadurch gekennzeichnet, dass die Aluminiumlegierung mindestens einseitig, vorzugsweise zweiseitig mit einer Legierung der Serie 1000 gemäß der Aluminiumzusammensetzung, vorzugsweise mit der Legierung AA1050 oder mit der Legierung AA7072 plattiert wird.
  11. Walzverfahren nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass das Walzen des Metallbandes ein Warmwalzen ist.
  12. Walzverfahren nach Anspruch 11, dadurch gekennzeichnet, dass die Temperatur der eventuell plattierten Aluminiumlegierung vor dem Warmwalzen mindestens 350 °C und höchstens 510 °C beträgt.
  13. Walzverfahren nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass die Oberflächentemperatur der vorgewärmten Walzen mindestens 200°C und höchstens 320 °C beträgt.
  14. Walzverfahren nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass das Walzen des Metallbandes ein Kaltwalzen ist.
  15. Walzverfahren nach Anspruch 14, dadurch gekennzeichnet, dass die Oberflächentemperatur der vorgewärmten Arbeitswalze mindestens 100 °C und höchstens 200 °C beträgt.
EP22744806.5A 2021-07-02 2022-06-28 Verfahren zum vorheizen einer walze zum walzen Active EP4363131B1 (de)

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FR2107217A FR3124747B1 (fr) 2021-07-02 2021-07-02 Procede de prechauffage d’un cylindre de travail de laminage
PCT/FR2022/051290 WO2023275488A1 (fr) 2021-07-02 2022-06-28 Procede de prechauffage d'un cylindre de travail de laminage

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US2088241A (en) * 1935-01-03 1937-07-27 Jay S Irvin Temperature control means for rolling mills
AT345237B (de) 1976-12-28 1978-09-11 Voest Ag Vorrichtung zum walzen von band- oder tafelfoermigem walzgut
EP0290637B1 (de) * 1987-05-09 1991-01-16 Kleinewefers GmbH Verfahren zum Betrieb einer Walzenmaschine und Steueranordnung zur Durchführung dieses Verfahrens
WO1988009229A1 (fr) * 1987-05-26 1988-12-01 Nippon Kokan Kabushiki Kaisha Procede de laminage a chaud et installation pour bandes fragiles
DE19503363A1 (de) * 1994-02-15 1995-09-07 Siemens Ag Einrichtung und Verfahren zum Regeln der Planheit und/oder Spannungsverteilung von gewalzten Metallbändern
AT408623B (de) * 1996-10-30 2002-01-25 Voest Alpine Ind Anlagen Verfahren zur überwachung und steuerung der qualität von walzprodukten aus warmwalzprozessen
JP3495909B2 (ja) * 1998-03-30 2004-02-09 株式会社東芝 圧延ロールのプロフィール制御装置
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JP3994902B2 (ja) * 2003-04-02 2007-10-24 Ｊｆｅスチール株式会社 熱間仕上圧延ワークロールのサーマルクラウン予測方法および熱間圧延方法
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ES2821326T3 (es) * 2015-09-21 2021-04-26 Novelis Inc Precalentamiento y control térmico de rodillos de trabajo en procedimientos de laminación de metales y sistema de control de los mismos

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EP4363131C0 (de) 2025-08-06
WO2023275488A1 (fr) 2023-01-05
US20240286181A1 (en) 2024-08-29
FR3124747A1 (fr) 2023-01-06
EP4363131A1 (de) 2024-05-08
ES3046915T3 (en) 2025-12-02

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