EP4363131A1 - Procede de prechauffage d'un cylindre de travail de laminage - Google Patents
Procede de prechauffage d'un cylindre de travail de laminageInfo
- Publication number
- EP4363131A1 EP4363131A1 EP22744806.5A EP22744806A EP4363131A1 EP 4363131 A1 EP4363131 A1 EP 4363131A1 EP 22744806 A EP22744806 A EP 22744806A EP 4363131 A1 EP4363131 A1 EP 4363131A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- rolling
- target
- metal strip
- effective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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 specifically that of rolling processes, preferably hot, of flat metal products made in particular based on an aluminum alloy.
- a rolling process carries out the shaping by plastic deformation of a metal in order to produce in particular flat products (sheets, strips, strips, etc.), that is to say a product whose thickness is less than its width, which is also less than its length.
- flat products sheets, strips, strips, etc.
- metal strip will be used here to speak generally of a flat product.
- a rolling mill usually comprises one or more successive rolling stands each formed of a pair of so-called counter-rotating work rolls of the same diameter.
- the metal strip is deformed by compression passing between the work rolls.
- the rolling stand may comprise another pair of so-called support rolls, each arranged in contact with a work roll.
- the rolled metal strip may have flatness defects, such as non-developable defects (eg long edges, long centres, etc.) and developable defects (eg bow, warp and twist defects). ). These defects can come from the deformation of the work rolls due to the high intensity of the mechanical stresses, as well as from the heterogeneous thermal expansion of the work rolls along their longitudinal axis.
- non-developable defects eg long edges, long centres, etc.
- developable defects eg bow, warp and twist defects
- the backup rolls mentioned above can be used to reduce the deflection of the work rolls.
- the work rolls can have a grinding crown, or grinding profile, that is to say a variation in the diameter between the center of the roll and its ends, to seek flatness of the metal strip, for example by slight long edges or long center, depending on the rolling stand considered.
- the rolling mill may include a thermal control device suitable for cooling or heating locally the working cylinders to modify the thermal expansion profile (thermal profile).
- the document WO00/00307A1 describes a method for hot rolling a metal strip in a rolling mill comprising a thermal control device.
- the thermal control device makes it possible to modify the thermal expansion profile of the working rolls at the edge of the strip.
- the work rolls can expand due to the heat produced in the grip, and have a thermal expansion profile of concave shape: the profile in diameter of each work roll then has a rounding towards the outside (bending), which leads to an increase in the thickness of the metal strip at its side edges. Note that, in this example, the work rolls do not have a grinding profile.
- the thermal control device comprises 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 extra thickness of the latter.
- the document FR2375920 describes another example of a rolling mill comprising an inductor thermal control device.
- 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 tensile mechanical stresses 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 process leads to a loss of material insofar as, 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 right-of-way.
- starter strips essentially intended to generate and stabilize the thermal expansion profile of the working rolls before the rolling operation, these strips starting metals are generally not recovered and can therefore be scrapped.
- the thermal control device comprises nozzles for spraying a heating liquid (heating sprayers) and nozzles for spraying a cooling liquid (cooling sprayers), distributed along the longitudinal axis of the working cylinders.
- 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 sprayers.
- this method requires the use of multiple sensors, including sensors for measuring the surface temperature of the work rolls.
- the object of the invention is 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 work roll according to a predefined target thermal expansion profile, quickly and efficiently, without the need to use different types of measurement sensors.
- the object of the invention is 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 determined target thermal expansion profile.
- the rolling mill comprising a thermal control device comprising Ni inductors distributed along the longitudinal axis of the work roll opposite the Ns longitudinal segments, the method comprising the following phases: a/ determination of the target thermal expansion profile at a moment's notice calculation t k , from predefined values of input parameters Pe representative of the dimensions and mechanical and thermal properties of the metal strip to be rolled, and from a first predefined physical model Ml expressing a relationship between the input parameters Pe and the target thermal expansion profile b/ determination of an effective average temperature profile along of Ns longitudinal segments of the working cylinder, from a power profile effective thermal generated by the Ni inductors and measured previously, and a second predefined physical model M2 expressing a relationship between the effective thermal power profile and the mean effective temperature c/ determination of a target average temperature profile along
- the average temperature target thermal expansion profiles effective and target average temperature can be determined for the longitudinal segments intended to be in contact with the metal strip to be rolled.
- the step of determining the target thermal power profile can include the following steps: identification of the longitudinal segment, of index jmax, for which the deviation is maximum, and definition of the target thermal power at a maximum value; determination of the target thermal power of others longitudinal segments such that
- An index inductor j can only be activated when the ratio 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 roll opposite the Ns longitudinal segments.
- the method may include a step of activating the coolers based on the difference between the profile target average temperature profile and the effective average temperature profile
- the phase of determining the average effective temperature profile can be carried out by numerical simulation, the cylinder of work being discretized according to an axisymmetric mesh 2D.
- the metal strip can be made of an aluminum alloy.
- Another object of the invention is a rolling process comprising the following steps a) the preheating of at least one working roll, preferably the two working rolls, of a rolling mill intended to roll a metal strip according to the method according to the invention, b) the rolling of the metal strip with at least the working roll thus preheated, preferably the two working rolls.
- Figure IA is a schematic and partial view of a rolling stand of a rolling mill according to one embodiment, in section along the longitudinal axis of the rolling mill, illustrating the thermal control device
- Figure IB is a schematic and partial view of a work roll of the rolling stand of fig.lA, in section along the longitudinal axis of the work roll, illustrating the segmentation of the work roll into Ns longitudinal segments and the longitudinal distribution of the Ni inducers
- FIG. 2A is a schematic and partial view of a working roll, in section along its longitudinal axis, showing an example of thermal expansion profile
- FIG. 2B illustrates an example of a target thermal expansion profile of the working cylinder, as well as the parameters A, B, xx and u making it possible to characterize it
- FIG. 3 is a flowchart of a preheating process implemented by the rolling mill of FIG. 1A according to one embodiment.
- the invention relates to a method for preheating at least one work roll of a rolling stand, making it possible to thermally expand the work roll locally, according to a predetermined target profile, before the metal strip to be rolled not be brought into the right-of-way.
- the metal strip is made from aluminium, without however the invention being limited to this type of material.
- the target thermal expansion profile of the 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 essentially resulting from the deformation of the metal band in the right-of-way. 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. [0026]
- the target thermal expansion profile is predefined so that, during the rolling operation, the rolled metal strip has, at the exit from the grip, the desired thickness profile and flatness.
- the profile of a physical quantity associated with the working cylinder is the variation (or the 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.
- Figure IA 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 a rolling stand 10 is shown.
- Figure IB is a schematic and partial view of the rolling stand 10, in section along the longitudinal axis of the work roll.
- XYZ a direct three-dimensional orthogonal reference XYZ, where the X axis is oriented along the rolling direction and corresponds to the longitudinal axis of the rolling mill 1 and the metal strip 2 in progress rolling, the Y axis corresponds to the longitudinal axis of the rolls, 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 axis longitudinal of the rolling mill 1, that is to say here at 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 work 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 here comprises a pair of work 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 cages, among others.
- Each work roll 11 of the rolling stands 10 can be equipped with inductors 21 and possibly with coolers 22 of the thermal control device 20.
- the rolling mill 1 can however comprise, upstream of the rolling stands 10, at least one stand reversible not equipped with inductors of the thermal control device.
- the work rolls 11 are equipped here with inductors 21 and coolers 22.
- the thermal control device 20 comprises a plurality of inductors 21 and optionally 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 at the work roll 11 considered which is substantially equal to a predetermined target profile.
- the work roll 11 is discretized over its entire length, along the longitudinal axis Y, in Ns successive longitudinal segments They, preferably of the same size.
- the working roll 11 can be discretized into several longitudinal segments They of width equal to approximately 20 mm along the Y axis.
- the thermal control device 20 comprises Ni inductors 21, here with Ni£Ns. They are distributed along the longitudinal axis Y facing the Ns successive longitudinal segments, here at the rate of 1 inductor for several successive longitudinal segments They. All the longitudinal segments They do not necessarily include inductors 21, in particular the longitudinal segments They located at the edge of the working roll 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 work cylinder 11. In this example, Ni inductors are located upstream and Ni inductors are located downstream of the work cylinder 11.
- the inductors 21 are adapted to transmit thermal energy in the longitudinal segments They of the working cylinder 11. This is 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) They opposite which it is arranged.
- the electromagnetic power received by the longitudinal segments They is converted by the Joule effect into calorific power, which thus leads to an increase in the average temperature of the longitudinal segments They concerned.
- the inductors 21 are activated and deliver a 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 have a sensor (not shown) adapted to provide the processing unit 23 with a measurement of the thermal power actually delivered.
- the thermal control device 10 can also include coolers 22, distributed along the working cylinder 11. Each cooler 22 can be a coolant spray nozzle. These coolers 22 thus make it possible to reduce the average temperature of the longitudinal segments They of the working roll. 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 perform calculations at different successive calculation instants t k , and to control the inductors 21 and, where applicable, the coolers 22 so that the effective average temperature profile of the longitudinal segments They (and therefore the effective thermal expansion profile) is substantially equal to the target average temperature profile (and therefore a target thermal expansion profile).
- the processing unit 23 includes a programmable processor capable of executing instructions recorded in an information recording medium. It further comprises a memory containing the instructions necessary for the implementation of the preheating method. It is also adapted to store the information calculated at each instant of calculation 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 representing dimensions and mechanical and thermal properties of the metal strip 2 to be rolled, and on the other hand, a profile target thermal expansion of the working cylinder defined at the level of the Ns longitudinal segments They.
- the predefined physical model M1 can be a database (abacus) obtained beforehand, 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 entrance to the stand rolling 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 Features 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 work rolls under the mechanical force, these thermal expansions and mechanical 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 Ad th (y) in diameter of the working cylinder 11 due to a temperature variation DT between two calculation instants t successive k . It is therefore a variation in diameter with respect to the reference profile d ref (y), whether or not the latter comprises the rectification component Ad rec (y).
- the target thermal expansion profile is independent of the calculation instant t k , and is determined at the start of the preheating process (it can however be adjusted according to the thermal state of the previous rolling mills (e.g. roughing stand It is noted when the profile is defined along the abscissa y continuous along the axis longitudinal Y, and is denoted or more simply (vector of Ns values) when it is defined along the Ns longitudinal segments They.
- Figure 2A illustrates a schematic and partial view, in section along the longitudinal axis Y, of a working roll 11 having a thermal expansion profile
- the thermal expansion profile corresponds to the deviation from the reference profile d ref (y).
- the reference profile is constant (no rectification component).
- the thermal expansion profile is not to scale for clarity of figure.
- FIG. 2B illustrates an example of target thermal expansion profile ⁇ d th (y) of a working roll 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 noted here A, B, u and xx.
- A is equal to 0.2mm
- B is equal to 0.18mm
- xx to 500mm u to 400mm
- 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 roll 11 along the longitudinal axis Y (more precisely from the center of the table of the cylinder 11), with an amplitude A at the center, and an amplitude B at the abscissa xx. Then, between position xx and the end of the table of the cylinder, the profile has a decrease given by a function erf.
- the parameter u is used 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 can in particular provide for an updating of the values of the parameters A, B, xx and u according to 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 cage is an upstream cage which is not thermally controlled by the thermal control device 20, in the direction where it does not include inductors 21. On the other hand, it includes coolers 22 here.
- the processing unit 23 performs its discretization along the Ns longitudinal segments They.
- the predefined physical model M2 expresses, for each instant of calculation t k , a relationship between a measured effective thermal power profile and an effective average temperature profile of the working cylinder 11. Subsequently, for these profiles, vector notation: where the vectors have respectively Ni and Ns values.
- the effective thermal power profile corresponds to the measurements carried out by the sensors of the Ni inductors 21 at the calculation instant t k and transmitted to the processing unit 23. From these measurements, the predefined physical model M2 determines the thermal energy mean received by the longitudinal segments They considered between the two consecutive calculation instants.
- the predefined physical model M2 can be a database (abacus) obtained beforehand, for example experimentally and/or numerically.
- the effective average temperature profile corresponds to the average temperature of the Ns longitudinal segments They at the time of calculation t k , and depends in particular on the average thermal energy received from the inductors 21 (and if necessary on the average thermal energy lost due to the coolers 22), and therefore of the measured profile of effective thermal power
- This is an average temperature of the longitudinal segments They of the working cylinder 11, and not only of the average temperature of the surface of the cylinder 11 in the longitudinal segments They.
- the average temperature is therefore constant at any point in the volume of each longitudinal segment They considered.
- the effective average temperature profile is here determined by means of a digital 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 They. It can preferably be a 1D axisymmetric mesh where each mesh corresponds to a longitudinal segment, or even a 2D axisymmetric mesh, that is to say along the longitudinal axis Y (longitudinal segments) and along an axis radial.
- the predefined physical model M2 is a physical model which performs a balance of the incoming and outgoing heat fluxes, and takes into account the thermal diffusion along the longitudinal axis Y.
- the physical model predefined M2 (eg axisymmetric 2D model) is solved by numerical simulation, for example in finite differences, and makes it possible to determine the effective mean temperature profile of the Ns longitudinal segments.
- Figure 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 relate to the two work 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 strip metal 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 for determining the target thermal expansion profile of the working roll, followed then several phases carried out at each calculation instant t k , namely a phase 20 for determining the effective average temperature profile of the working cylinder, a phase 30 of determining the target average temperature profile of the cylinder of work, then, on the basis of a difference between the two profiles of average temperature and determined, of an activation phase or not of the inductors on the basis of a profile of target thermal power having been determined.
- the work roll 11 is discretized into Ns longitudinal segments They, and the thermal control device 20 comprises Ni inductors 21 distributed along the longitudinal axis Y, here with Ns>Ni.
- the coolers 22 that the thermal control device 20 may include are not taken into account.
- Phase 10 determination of a target thermal expansion profile of the work cylinder 11.
- input parameters Pe are defined which are 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 strip metal at the entrance to 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 exit thickness h.
- the processing unit 23 determines the target thermal expansion profile from the defined input parameters Pe and by means of the model predefined physics M1 implemented in the memory of the processing unit 23.
- the profile of the target thermal expansion is discretized on the Ns longitudinal segments They, to thus obtain the profile
- the thermal expansion profile as well as the temperature profiles target and actual average can be set only for segments longitudinal segments They intended to be in contact with the metal strip 2, that is to say here for the longitudinal segments They with an index ranging from iwi to iwf.
- the following phases 20 to 60 are carried out iteratively at different successive instants, the time being discretized at a predefined calculation frequency, for example all the 45 seconds.
- a calculation instant t k also called current instant.
- Phase 20 determination of an effective average temperature profile of the Ns longitudinal segments They of the working cylinder 11.
- the effective average temperature profile is determined of the working cylinder 11. As indicated above, this is the average temperature of each longitudinal segment They of the working cylinder 11 (constant temperature on the surface and in the volume of the longitudinal segment), and not only the temperature of surface. This average temperature is responsible for the (average) thermal expansion of the longitudinal segment They considered.
- Phase 30 determination of a target average temperature profile (and noted Ns longitudinal segments They of the working cylinder 11.
- the target average temperature profile of the Ns longitudinal segments They of the working cylinder 11, from the effective mean temperature profile and the target thermal expansion profile For this, we take as a reference a longitudinal segment 11, here of index iwi, where one of the side edges of the metal strip 2 is located. Then, the average target temperature is calculated from the following relationship: where d ref (j) is the reference diameter at index j, and where ⁇ is the average coefficient of thermal expansion of the working cylinder 11. Of course, other calculations are possible. [0069] Phase 40: determination of a difference between the average temperature profile target and effective average temperature profile
- a maximum difference is determined here between the profile of target mean temperature and effective mean temperature profile
- index jmax located between iwi and iwf for which the temperature difference is maximum:
- the objective is here 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 difference Ec(t k ) representative of the difference between the profile of target average temperature and the average effective temperature profile
- This difference Ec(t k ) is therefore also representative of the difference between the target thermal expansion profile and the effective thermal expansion profile
- the deviation Ec(t k ) can be defined in different ways. This can be the local maximum value between the target average temperature profile and the mean effective temperature It can also be a point-by-point comparison point between the target average temperature profile and the average temperature profile effective, for example an average or a possibly weighted sum of the difference in absolute value between these two profiles. It can also be a duration of activation of the inductor 21 associated with the longitudinal segment of index jmax, that is to say the one for which the difference in temperature is maximal.
- the convergence criterion is considered verified when the difference Ec(t k ) is less than or equal to the threshold value zero, in which case the preheating of the working roll(s) is considered to be finished (step 70). Information can then be given to the user of rolling mill 1, for example the difference Ec(t k ) in question, or information on the remaining heating time (ratio between the difference in temperature 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 zero, 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 of 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 noted and activation of inductors accordingly.
- the target thermal power profile is determined at delivered by the inductors 21. Provision can be made in this regard to activate only the inductors 21 intended to face the metal strip during the rolling operation, that is to say those located opposite the segments longitudinal They have indices between iwi and iwf. For this, the target thermal power of the inductor 21 of index jmax is defined at 100% of the maximum thermal power P Q,max .
- the target thermal power to be delivered by the other inductors 21 of index j is equal to the maximum thermal power P Q,max modulated by the ratio
- an activation threshold can be taken into account: thus, when the ratio is lower than a predefined threshold R T , the inductor 21 of index j considered is not activated. This gives the target thermal power profile of the inductors 21.
- a control signal is transmitted by the processing unit 23 to the inductors 21 so that they deliver a target thermal power Depending on the value of the target thermal power the inductors 21 are activated or not and deliver (or attempt to deliver) the determined target heat output. Equivalently, 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 actually delivered, here simultaneously with their operation, and in transmits the measured value to the processing unit 23.
- phases 20 to 50 are then repeated, and the time of calculation t k is incremented.
- this phase 60 may not have been carried out, and the information is given to the operator of the rolling mill 1 that the effective average temperature profile has converged towards the temperature profile target average and therefore the effective thermal expansion profile has converged to the expansion profile thermal target
- the rolling operation of the metal strip 2 can therefore start and the inductors 21 can be deactivated, immediately (or not), insofar as the heat produced by the rolling of the metal strip 2 in the grip will cause a thermal expansion of the work roll 21 corresponding to the target profile target thermal expansion Ad (h ).
- the use of inductors 21 and of 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 profile target average temperature.
- the inductors 21 modify the average temperature at the surface and in volume of the longitudinal segments They, and not only the surface temperature like the nozzles for spraying a heating liquid, which makes it possible to use a model simplified predefined physics M2, for example a model of the 2D axisymmetric type, which directly determines the average temperature of the longitudinal segments of the working cylinder without going through the measurement of the surface temperature.
- a model simplified predefined physics M2 for example a model of the 2D axisymmetric type, 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 user of dedicated sensors).
- the thermal control device can comprise coolers distributed along the longitudinal axis Y of the work roll, and the processing unit can transmit a control signal to the coolers on the basis of the difference between the profile of target mean temperature and effective mean temperature profile
- the metal strip comprises an aluminum alloy, preferably the aluminum alloy is an alloy chosen, according to the designation of the aluminum association, from among the AA2014 alloy, YY2017, YY2024, YY2027, YY2046, AA2050, AA2056, AA2060, AA2074, AA2098, AA2139, AA2195, AA2198, AA2214, AA2219,
- AA5005 AA5049, AA5050, AA5052, AA5083, AA5086, AA5088, AA5150, AA5154, AA5182,
- the metal strip is a clad aluminum alloy.
- the aluminum alloy is plated on at least one side, preferably two sides, with an alloy of the 1000 series according to the association of aluminum, preferably the alloy AA1050 or with the alloy AA7072.
- the central portion of the clad aluminum is AA2024 or AA2524 alloy and the clad is a 1000 series alloy, preferably AA1050.
- the central portion of the clad aluminum is AA7075, AA7175 or AA7475 alloy and the clad is AA7072 alloy.
- Clad aluminum alloys are known as clad product in standard 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 plated, 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 plated, before its hot rolling is at least 370° C. and at most 510° C. or 490° C. or 470° C. or 450° C. C or 430°C or 410°C or 390°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 390° C. and at most 510° C. or 490° C. or 470° C.
- the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 410° C. and at most 510° C. or 490° C. or 470° C. or 450° C. C or 430°C.
- the temperature of the aluminum alloy, optionally plated, before its hot rolling is at least 430° C. and at most 510° C. or 490° C. or 470° C. or 450° C. vs.
- the temperature of the aluminum alloy, possibly plated, before its hot rolling is at least 450°C and at most 510°C or 490°C or 470°C.
- 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, possibly 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. C or 290°C or 270°C. In another embodiment, the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 270° C. and at most 370° C. or 350° C. or 330° C. or 310° C. C or 290°C.
- the temperature of the aluminum alloy, optionally plated, after its hot rolling is at least 290° C. and at most 370° C. or 350° C. or 330° C. or 310° C. vs. In another embodiment, the temperature of the aluminum alloy, optionally plated, 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 working 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. °C.
- the surface roll temperature during hot rolling is a minimum of 220°C and a maximum of 320°C or 300°C or 280°C or 260°C or 240°C.
- the surface roll temperature during hot rolling is a minimum of 240°C and a maximum of 320°C or 300°C or 280°C or 260°C.
- the surface roll temperature during hot rolling is a minimum of 260°C and a maximum of 320°C or 300°C or 280°C. In another embodiment, the surface roll temperature during hot rolling is a minimum of 280°C and a maximum of 320°C or 300°C. In another embodiment, the surface roll temperature during hot rolling is a minimum of 300°C and a maximum of 320°C.
- the rolling of the metal strip is cold rolling. Preferably, 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 working roll is at least 100°C and at most 200°C or 180°C or 160°C or 140°C or 120°C.
- the surface roll temperature during cold rolling is a minimum of 120°C and a maximum of 200°C or 180°C or 160°C or 140°C.
- the surface roll temperature during cold rolling is a minimum of 140°C and a maximum of 200°C or 180°C or 160°C.
- the surface roll temperature during cold rolling is a minimum of 160°C and a maximum of 200°C or 180°C.
- the surface roll temperature during cold rolling is a minimum of 180°C and a maximum of 200°C.
- the two working rolls, 700 mm in diameter, of a hot rolling mill were each equipped with 33 inductors of 80 mm along the length of said rolls.
- the working rolls were discretized into segments of 20 mm in length for the implementation of the preheating method according to the invention.
- the use of the roll preheating process has eliminated the use of metal starter strips to stabilize the thermal profile required for hot rolling aluminum alloys. This improvement concerns in particular the AA5083, AA5086, AA5088, AA5182, AA5052, AA5754, AA2098, AA2198, AA2195, AA2024 and AA2524 alloys.
- This improvement also concerns plated aluminum alloys, the central part being an AA2024 or AA2524 aluminum alloy and the plating being I ⁇ A1050.
- This improvement also concerns clad aluminum alloys whose central part is an aluminum alloy AA7075 or AA7175 and whose plating is I ⁇ A7072.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4363131A1 true EP4363131A1 (fr) | 2024-05-08 |
| EP4363131C0 EP4363131C0 (fr) | 2025-08-06 |
| EP4363131B1 EP4363131B1 (fr) | 2025-08-06 |
Family
ID=77180246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22744806.5A Active EP4363131B1 (fr) | 2021-07-02 | 2022-06-28 | Procede de prechauffage d'un cylindre de travail de laminage |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240286181A1 (fr) |
| EP (1) | EP4363131B1 (fr) |
| ES (1) | ES3046915T3 (fr) |
| FR (1) | FR3124747B1 (fr) |
| WO (1) | WO2023275488A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023112623A1 (de) * | 2023-02-16 | 2024-08-22 | Achenbach Buschhütten GmbH & Co. KG | Temperiervorrichtung und Verfahren zur Erwärmung von Arbeitswalzen |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 (fr) * | 1987-05-09 | 1991-01-16 | Kleinewefers GmbH | Procédé pour l'exploitation d'une calandre et dispositif de contrôle pour l'application du procédé |
| 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 |
| DE19830034A1 (de) | 1998-06-26 | 1999-12-30 | Mannesmann Ag | Verfahren und Vorrichtung zum Walzen von Warmbändern |
| 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 |
| DE102006001195A1 (de) * | 2006-01-10 | 2007-07-12 | Sms Demag Ag | Verfahren zum Gieß-Walzen mit erhöhter Gießgeschwindigkeit und daran anschließendem Warmwalzen von relativ dünnen Metall-,insbesondere Stahlwerkstoff-Strängen,und Gieß-Walz-Einrichtung |
| KR101322179B1 (ko) * | 2011-08-01 | 2013-10-28 | 주식회사 포스코 | 마모에 의한 이상 두께 프로파일 방지 기능을 구비한 열간압연장치 및 열간압연방법 |
| GB2502156B (en) * | 2012-05-19 | 2014-08-20 | David James Littler | Rolling mill temperature control |
| NO2755812T3 (fr) * | 2013-03-12 | 2018-06-30 | ||
| 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 |
-
2021
- 2021-07-02 FR FR2107217A patent/FR3124747B1/fr active Active
-
2022
- 2022-06-28 EP EP22744806.5A patent/EP4363131B1/fr active Active
- 2022-06-28 ES ES22744806T patent/ES3046915T3/es active Active
- 2022-06-28 US US18/574,344 patent/US20240286181A1/en active Pending
- 2022-06-28 WO PCT/FR2022/051290 patent/WO2023275488A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3124747B1 (fr) | 2023-06-30 |
| EP4363131C0 (fr) | 2025-08-06 |
| WO2023275488A1 (fr) | 2023-01-05 |
| US20240286181A1 (en) | 2024-08-29 |
| EP4363131B1 (fr) | 2025-08-06 |
| FR3124747A1 (fr) | 2023-01-06 |
| ES3046915T3 (en) | 2025-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3046703B1 (fr) | Procédé de contrôle de la densité d'énergie d'un faisceau laser par analyse d'image et dispositif correspondant | |
| EP0841112B1 (fr) | Procédé de coulée continue entre cylindres | |
| EP0719607B1 (fr) | Procédé de régulation pour la coulée continue entre cylindres | |
| FR2575686A1 (fr) | Procede de soudage a haute frequence au moyen d'une resistance electrique et utilisant une exposition a un faisceau laser | |
| EP4363131B1 (fr) | Procede de prechauffage d'un cylindre de travail de laminage | |
| US20100140236A1 (en) | Laser machining system and method | |
| EP0047218B1 (fr) | Procédé de contrôle et de régulation de paramètres de marche d'une machine de coulée continue de bandes entre cylindres | |
| FR2823300A1 (fr) | Procede de detection de defauts de planeite | |
| EP1199543A1 (fr) | Procédé et dispositif de detection de planéité | |
| EP2802427B1 (fr) | Dispositif de refroidissement a double jet pour moule de coulee semi-continue verticale | |
| EP0041025B1 (fr) | Procédé et dispositif pour le laminage sans contrainte de métaux | |
| EP2560785B1 (fr) | Procede et dispositif de controle d'un cycle thermique d'une soudure par raboutage d'extremites de bandes | |
| EP1342529B1 (fr) | Procédé et dispositif de contrôle du processus de soudage par étincelage de deux pièces métalliques | |
| CA3021395A1 (fr) | Procede et dispositif pour le moulage en coquille d'un alliage metallique | |
| FR2513548A1 (fr) | Procede de laminage a chaud de feuillards et laminoir a chaud pour feuillards | |
| FR3113851A1 (fr) | Procede de fabrication d’une piece metallique par fusion selective en lit de poudre | |
| CH513682A (fr) | Procédé de laminage d'une ébauche et laminoir pour sa mise en oeuvre | |
| EP0407323B1 (fr) | Procédé et dispositif de coulée continue entre cylindres de produits métalliques minces aptes au laminage à froid direct | |
| EP0000855A1 (fr) | Procédé de préréglage d'un train continu à cages tandem pour le laminage à chaud de produits métalliques | |
| Auzinger et al. | Application of advanced technology packages for improved strip profile and flatness in hot-strip-mills | |
| WO2001027341A1 (fr) | Procede de rechauffage par induction de materiaux thixotropes | |
| JP4846680B2 (ja) | サーマルクラウン予測方法及びサーマルクラウン予測装置 | |
| FR2849197A1 (fr) | Procede et dispositif de controle photothermique de flans d'aciers colles | |
| FR2862011A1 (fr) | Procede et dispositif de coupe des extremites d'ebauches avant laminage a chaud de finition | |
| FR3105747A1 (fr) | Procédé et installation de fabrication additive de pièce métallique |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20240124 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
| INTG | Intention to grant announced |
Effective date: 20250228 |
|
| GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602022019009 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: FRENCH |
|
| U01 | Request for unitary effect filed |
Effective date: 20250826 |
|
| U07 | Unitary effect registered |
Designated state(s): AT BE BG DE DK EE FI FR IT LT LU LV MT NL PT RO SE SI Effective date: 20250901 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 3046915 Country of ref document: ES Kind code of ref document: T3 Effective date: 20251202 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20251206 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20251106 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20250806 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20251107 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20250806 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20251106 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20250806 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20250806 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20250806 |