EP2539089B2 - Procédé de refroidissement d'une tôle au moyen d'une branche de refroidissement, branche de refroidissement et dispositif de contrôle et/ou de régulation pour une branche de refroidissement - Google Patents

Procédé de refroidissement d'une tôle au moyen d'une branche de refroidissement, branche de refroidissement et dispositif de contrôle et/ou de régulation pour une branche de refroidissement Download PDF

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Publication number
EP2539089B2
EP2539089B2 EP11701838.2A EP11701838A EP2539089B2 EP 2539089 B2 EP2539089 B2 EP 2539089B2 EP 11701838 A EP11701838 A EP 11701838A EP 2539089 B2 EP2539089 B2 EP 2539089B2
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EP
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Prior art keywords
sheet metal
cooling
sheet
cooling section
coolant
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EP11701838.2A
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German (de)
English (en)
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EP2539089A2 (fr
EP2539089B1 (fr
Inventor
Klaus Weinzierl
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Primetals Technologies Germany GmbH
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Primetals Technologies Germany GmbH
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Classifications

    • 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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

Definitions

  • the invention relates to a method for cooling sheet metal, in particular heavy plate, by means of a cooling section, the cooling section having a plurality of coolant delivery devices for cooling the upper side of the sheet and a plurality of coolant delivery devices for cooling the underside of the plate, with a predetermined target state of the sheet being achieved at a Reference point is reached at and / or after exiting the cooling section, wherein a coolant delivery for a first and a second coolant delivery device is determined, wherein the first and the second coolant delivery device are arranged opposite each other relative to the metal sheet.
  • the invention relates to a control and/or regulating device for a cooling section.
  • the invention lies in the technical field of rolling mills, in particular heavy plate rolling mills, and relates in particular to cooling for heavy plate.
  • the cooling or the operation of the cooling section has a significant influence on the quality and properties of the sheet metal produced.
  • the cooling section of a heavy-plate mill serves in particular to set the material properties of the plate in the desired way.
  • Heavy plate usually has a thickness of 3mm or more and thus meets the definition according to EN 10029.
  • the object of the invention is to further increase the flatness of heavy plate produced during the production of heavy plate while at the same time having a high throughput of the heavy plate mill.
  • the procedural part is solved by a method for cooling a metal sheet by means of a cooling section, the cooling section having a plurality of coolant delivery devices for cooling an upper side of the metal sheet and a plurality of coolant delivery devices for cooling an underside of a metal sheet, with a predetermined target state of the metal sheet at a reference point being achieved by means of the cooling is achieved upon and/or after exiting the cooling section, with a coolant delivery for a first and a second coolant delivery device being determined, with the first and the second coolant delivery device being arranged opposite one another relative to the metal sheet, with the determination of the coolant delivery for the first and second coolant delivery device based on a predetermined heat flow to be dissipated from the sheet metal side facing the respective coolant delivery device, with a temperature, in particular surface temperature, for the respective heat flow to be dissipated , the respective side of the sheet is taken into account.
  • the inventor has recognized that, in order to maintain the flatness as well as possible, it is not sufficient merely to take into account the heat transfer coefficients for the upper side and underside and to match them to one another.
  • the temperature of the top side of the sheet and/or the temperature of the bottom side of the sheet is always greater than or equal to a predetermined limit temperature while passing through the cooling section.
  • the limit temperature can be 350° C. in particular.
  • a ratio of the heat flow to be dissipated from the upper side of the sheet metal to the lower side of the sheet metal is set as a function of the flatness of the sheet metal. This flatness can be present in particular at the entry into the cooling section.
  • the temperature of the upper side or the underside of the sheet metal can be determined by means of a measurement, for example by means of a pyrometer. Alternatively, calculated actual temperatures, e.g. known from sheet metal tracking calculations, can also be used.
  • Coolant release is understood to mean both the quantitative release of the coolant per unit of time and the manner in which the coolant is released, e.g. the setting of the application angle, etc.... Frequently, only the coolant quantity per Time unit set.
  • a device which is designed to deliver coolant onto the metal sheet is regarded as a coolant delivery device.
  • the coolant delivery device can be an individually switchable valve arrangement with one or more coolant outlets. Alternatively, this can also be a plurality of individually switchable valve outlet devices which are controlled or operated jointly.
  • the first-mentioned embodiment is preferred for the invention, since it allows more flexible adjustment or more flexible operation of the cooling section.
  • All coolant delivery devices of the cooling line are preferably designed as individually switchable valve arrangements with associated coolant outlets.
  • a desired temperature to be reached or also a desired microstructure or a desired phase composition of the sheet metal can be regarded as the end state for a sheet metal.
  • the final state ensures that a desired product is actually made available through the cooling section of the heavy-plate mill. If the final state is not reached, the manufactured product is usually of inferior quality or discarded as scrap.
  • the cooling section can contribute to maintaining the product quality, since on the one hand unflat sheet metal can be converted into flat sheet metal, and on the other hand sheet metal entering the cooling section flat also exits the cooling section flat again.
  • control and/or regulating device for the cooling section can advantageously be operatively connected to a flatness measuring device upstream of the cooling section, so that the cooling section can be controlled and/or regulated accordingly depending on the flatness recorded, in particular in such a way that the unflatness of a Unplanar sheet metal entering the cooling section can be reduced and sheet metal entering the cooling section remains flat.
  • the ratio of the heat flow to be dissipated from the upper side and the heat flow to be dissipated from the underside is essentially equal to one for a flat sheet, in particular a sheet entering the cooling section flat. This means that the heat dissipated per unit of time on the upper side is equal to the heat dissipated per unit of time on the underside. Due to the possibly different temperatures and the different coolant dwell times on the sheet, in particular for the top and bottom of the sheet, this means that different amounts of coolant must be applied for the top and bottom.
  • the ratio is set in such a way that the unplanarity of the sheet after passing through the cooling section is reduced relative to the unplanarity of the sheet before passing through the cooling section.
  • the respective heat flow can be modeled using an empirical, physical or empirical-physical model. A person skilled in the art can determine this, for example, with the help of metal sheets that have been cooled in the past.
  • the model of the heat flow is usually at least a function of the respective temperature of the side of the sheet, the respective temperature of the coolant used for cooling, the speed of the sheet and the amount of coolant. Other parameters can occur, such as speed, with which the coolant hits the sheet metal surface.
  • a coolant quantity for a coolant delivery device can then be determined on the basis of the above equation system in order to set a desired heat flow.
  • a surface temperature of the metal sheet is preferably used as the limit temperature.
  • the limit temperature can be selected from a temperature range of 420°C to 300°C.
  • this surface temperature range of the metal sheet depending on the respective cooling conditions in a cooling section, there is a change in the behavior of the coolant when cooling the metal sheet, particularly on the upper side, which is accompanied by a change in the cooling mechanism or cooling principle. This change leads to cooling conditions that are difficult to control, which means that the sheet metal can exit the cooling section in an uneven manner.
  • the coolant delivery is determined for at least one of the coolant delivery devices independently of the coolant delivery of the coolant delivery device located opposite relative to the metal sheet.
  • the determination is made in such a way that the metal sheet - in particular without explicit calculation of the point mentioned above - is divided essentially parallel to the top or bottom into a first upper metal sheet and a second lower metal sheet, with the coolant delivery being separate for the first and the second sheet is determined, wherein a heat exchange between the first sheet and the second sheet is not taken into account in the respective determination.
  • the division is made according to a numerical value x, which means the ratio of the thickness of the lower sheet relative to the total thickness.
  • This virtual division is carried out depending on the flatness of the metal sheet, which is measured as it enters the cooling zone. In this configuration, too, it is taken into account that the temperature of the top side of the sheet and/or the temperature of the bottom side of the sheet is always greater than or equal to a predetermined limit temperature while passing through the cooling section.
  • the limit temperature can be 350° C. in particular.
  • the term "virtual" means that the sheet metal is only divided from a calculation perspective. There is therefore no actual, i.e. physical, division of the sheet metal.
  • the procedure is advantageously such that for the first sheet and the second sheet, an individual, in particular time, curve of a variable describing an energetic state of the sheet is determined, on the basis of which a heat flow to be dissipated for the respective upper side and the lower side of the sheet are determined.
  • an actual temperature curve, an actual enthalpy curve or a curve of another suitable variable, in particular a calculated one can be used as the variable describing the energetic state.
  • this is preferably specified individually for a large number of defined sheet metal sections, so that the greatest possible dynamics are achieved for the cooling and the entire sheet has the desired properties throughout.
  • a surface temperature of the metal sheet is preferably used as the limit temperature.
  • the magnitude of the limit temperature is determined, for example, in such a way that the cooling effect principle is the same for the entire cooling section. If the cooling effect principle for the sheet changes while it is passing through the cooling section, the cooling becomes difficult to control. For this reason, it is provided that the cooling section is operated in such a way that this limit temperature is preferably not fallen below either by the upper side of the sheet or by the underside of the sheet while passing through the cooling section. With this method, the specified boundary surface temperature is simply taken into account as a secondary condition when determining the respective heat flow.
  • the cooling mechanism is usually determined by the behavior of the coolant on the sheet, e.g. the formation of vapor cushions with water cooling, the way the vapor is distributed on the sheet, etc. If there is a change in the behavior of the sheet due to the temperature profile of the surface of the sheet Coolant of the sheet and thus to a change in the cooling mechanism, this leads to poor controllability of the cooling and thus to a product that does not usually correspond to customer requirements.
  • this is particularly the case on the upper side if, away from the immediate point of impact or in the immediate vicinity of the coolant jet, excess coolant draining off the upper side is no longer separated from the surface of the sheet by a vapor layer, but spills over in an uncontrolled manner in the liquid phase moves the sheet and gradually evaporates.
  • changing the cooling mechanism can result in an unflat product, since the heat flow is difficult to calculate and predict due to the change in the cooling mechanism, especially on the upper side of the sheet. This leads to corresponding temperature deviations, which cause material stresses. These cause the sheet metal to warp and become unplanar.
  • This problem can be avoided by considering a limit temperature when determining the coolant output, which improves the flatness of the sheet metal while at the same time ensuring a high throughput.
  • control and/or regulating device for a cooling section with a machine-readable program code which includes control commands which cause the control and/or regulating device to carry out the method according to one of claims 1 to 5 when it is executed.
  • the invention also extends to machine-readable program code for a control and/or regulating device for a cooling section, the program code having control commands which cause the regulating and/or control device to carry out the method according to one of claims 1 to 5.
  • the invention extends to a storage medium with a machine-readable program code stored thereon according to claim 7.
  • All storage media on which the corresponding program code can be stored come into consideration as a storage medium, for example CDs, DVDs, flash storage media such as USB sticks, or memory cards.
  • the object is also achieved by a cooling section for cooling sheet metal, the cooling section having a plurality of coolant delivery devices for cooling the upper side of a sheet and a plurality of coolant delivery devices for cooling the underside of a metal sheet, the cooling section being operatively connected to a control and/or regulating device according to claim 7 is, wherein the coolant delivery devices by means of the control and / or regulating device according to claim 7 can be controlled and / or regulated.
  • This provides a cooling section by means of which the flatness of the metal sheet to be cooled is improved.
  • FIG 1 shows an exemplary cooling section 1 for cooling heavy plate B. This is part of a heavy-plate train that is not shown in detail.
  • the cooling section 1 comprises a multiplicity of coolant delivery devices 2 which are arranged both above and below the plate B. Their coolant output can be set individually, which allows the cooling section 1 to be as flexible and dynamic as possible.
  • Each coolant delivery device 2 of the cooling section 1 is often assigned a directly opposite coolant delivery device 2 . If these coolant delivery devices, which are arranged directly opposite one another, are in operation, then they each cool the same sheet metal section.
  • the coolant dispensing device 2 arranged above the metal sheet cools an upper side O of the sheet metal section, while the coolant dispensing device 2 arranged below the metal sheet B cools an underside U of the sheet metal section.
  • cooling line 1 is preceded by a flatness measuring device 3 in the mass flow direction, by means of which a flatness of the metal sheet B entering the cooling line 1 can be detected.
  • the cooling line 1 is also preceded by two temperature measuring devices 4 and 5, of which the temperature measuring device 4 arranged above the sheet B records the temperature of the upper side O of the sheet and the temperature measuring device 5 arranged below the sheet B the temperature of the lower side of the sheet U.
  • the temperature be determined by means of a model from the upper side of the sheet O and/or from the lower side of the sheet U before entering the cooling section 1 .
  • sheet B is usually divided into a large number of sheet metal sections for calculation purposes and each of these sheet metal sections is tracked for calculation purposes, the actual temperature of the upper side of the sheet and/or the underside of the sheet metal for a respective sheet section at a definable reference point in front of the cooling section can also be determined using the sheet tracking calculation be determined.
  • the calculated by a model temperature distribution over the sheet thickness based on the temperature measurement is first adapted in such a way that measured and calculated temperature match on the side of the measurement. The calculated value can then be taken from the model on the opposite side on which the measurement is missing.
  • the cooling section has a temperature measuring device 6 which is arranged behind the cooling section 1 in the mass flow direction. These temperature values recorded after cooling section 1 can be used to correct the calculation of the coolant delivery, e.g. as part of a model adaptation.
  • the coolant dispensing device 2, the temperature detection devices 4, 5 and 6, and the flatness measuring device 3 is or are operatively connected to a control and/or regulating device 10.
  • the operation of the cooling section 1, in particular the coolant delivery, is controlled or regulated by means of the control and/or regulating device 10.
  • the corresponding calculation methods for determining the coolant delivery are therefore stored on this control and/or regulating device 10 .
  • control and/or regulating device 10 has a machine-readable program code 12 .
  • the machine-readable program code 12 is stored, for example, using a storage medium 11, such as a CD, a DVD, a flash memory device, e.g. a USB stick, or other data carriers.
  • the machine-readable program code 12 can be supplied to the open-loop and/or closed-loop control device 10 via a network.
  • the machine-readable program code 12 is stored on a storage medium which is part of the open-loop and/or closed-loop control device 10 .
  • FIG 2 shows a flowchart according to which the coolant delivery, in particular the coolant quantity to be delivered per unit of time, is determined for a pair of coolant delivery devices arranged directly opposite one another.
  • a method step 100 the temperature To of the upper side of the sheet and the temperature Tu of the lower side of the sheet are determined. This can be done, for example, by means of a measurement, as shown in FIG FIG 1 , alternatively these temperatures can be determined from the concurrent model calculations.
  • a total heat flow is determined which is required to move the sheet metal from its known initial state in front of the two opposite coolant delivery devices to the desired final state behind the two opposite coolant dispensers, eg to a desired initial state before the next two opposite coolant dispensers or the cooling stop temperature. Because the temperature of the top and bottom of the sheet is known, this can be done with increased accuracy.
  • This required total heat flow is now to be distributed to the individual pairs of coolant delivery devices, taking into account that the temperature of the top and bottom of the sheet metal must not fall below a predetermined limit. Furthermore, it is taken into account that the heat flow that can be dissipated is strongly temperature-dependent. Furthermore, the flatness of the sheet before it enters the cooling section is taken into account.
  • the total heat flow j tot determined in method step 101 is distributed to the two coolant delivery devices.
  • x designates the constant calculated in step 102 .
  • a number a , 0 ⁇ a ⁇ 1 is calculated in such a way that when using the heat flows aj above instead of j above and/or aj below instead of j below with the greatest possible value of a, this limit temperature is just maintained. The procedure then continues with step 103 with these heat flows.
  • the quantities of coolant for the coolant delivery device above the metal sheet and below the metal sheet for the respective pair of coolant devices can then be determined from this. This takes place in a method step 104.
  • the heat flow is adjusted, taking into account the different temperatures of the top and bottom of the sheet, so that the same heat flow is dissipated from the top and bottom of the sheet. Because the temperature of the upper side of the sheet and the lower side of the sheet is usually different, this requires a change in the coolant quantities for the coolant delivery device arranged above the plate and for the coolant delivery device arranged below the plate compared to the coolant quantities determined according to the prior art. However, uniform cooling is only possible if the heat flow is the same on the upper side and underside of the sheet metal, which is achieved by a procedure according to one of the embodiments of the method according to the invention.
  • a targeted non-uniform cooling of the top and bottom of the sheet may also be desired, for example if the sheet enters the cooling line unevenly. This is recorded by the flatness measuring device. The result of the flatness measurement is included in the further operation of the cooling section, with the cooling being adjusted in such a way that the sheet is counteracted if it is not flat.
  • Another reason for an uneven setting of the heat flow for the upper and lower sides of the sheet can also be an excessive temperature difference between the upper and lower sides of the sheet.
  • this can lead to imperfections in the sheet metal in the cooling section. For example, if the temperature differences between the top and bottom of the sheet are too great, it may no longer be possible to cool the sheet in such a way that the surface temperature always remains above a limit temperature, but at the same time greater heat dissipation is required to obtain a flat sheet that meets the desired requirements Target status also achieved.
  • the targeted unequal distribution of the heat flow between the top and bottom of the sheet is suitable for reducing such temperature differences and producing a flat sheet.
  • This procedure is carried out in this way for all opposite coolant delivery devices.
  • a query is made in a method step 105 in each case as to whether this is to be done for further coolant delivery devices arranged opposite one another.
  • a quantity of coolant to be delivered individually by the respective coolant delivery device is determined, which ensures that the target state of the sheet metal is reached while corresponding boundary conditions are observed.
  • the coolant delivery devices of the cooling section are then adjusted accordingly in the manner described above, so that the desired final state of the sheet metal is achieved.
  • a calculation method is used to determine the coolant delivery for the coolant delivery devices above and below the sheet, which determines the coolant delivery or quantity separately for the upper side and underside of the sheet.
  • the plate is divided into an upper and a lower plate for calculation purposes, with heat exchange between this upper and lower plate being disregarded.
  • the sheet is then virtually divided at height x into an upper sheet and a lower sheet. Where x means the ratio of the thickness of the lower sheet relative to the total sheet thickness. The division takes place virtually at the height x times the sheet thickness, measured from the underside of the sheet upwards.
  • a method step 200 the temperature of the upper side of the sheet and the lower side of the sheet are determined upstream of the cooling section. From this and with knowledge of the temperature profile in the direction of the thickness of the metal sheet, an average temperature for the upper metal sheet and an average temperature for the lower metal sheet are determined.
  • a method step 201 for example, an average temperature profile over time for a specific sheet section of the sheet is specified for the upper sheet, so that this is transferred from a known average initial temperature before the start of cooling to an average desired end temperature.
  • the specified temperature curves are usually different for the upper sheet and the lower sheet due to the different initial temperature and the different coolant behavior on the top and bottom of the sheet.
  • the end state to be achieved is usually the same for the upper and lower sheet.
  • a local temperature profile can also be specified for the two sheets. It is also conceivable to specify a temporal or local enthalpy profile for the upper and lower metal sheet, so that the metal sheet reaches a desired end state.
  • a respective heat flow for the upper or lower sheet is determined from the respectively specified course, which is required to set the desired course for the upper sheet or the lower sheet. This is done using the usual physical equations that describe temperature development and heat transfer.
  • the coolant delivery in particular coolant quantity per unit of time, for the coolant delivery device arranged above the plate and for the coolant delivery device arranged below the plate is determined from the determined heat flows for the upper plate and the lower plate.
  • a method step 207 the coolant delivery devices of the cooling section are adjusted accordingly in the above manner, so that the desired final state of the sheet metal is achieved.
  • FIG 4 shows a flowchart which takes into account a limit temperature when determining a coolant delivery for a coolant delivery device.
  • the consideration of such a limit temperature is very advantageous because - depending on the coolant used - the cooling effect depends significantly on the behavior of the coolant.
  • the behavior of the coolant can change due to the temperature of the sheet metal, for example.
  • the coolant can be discharged taking into account a limit temperature, which must not be fallen below during cooling, at least not on the upper side of the sheet and possibly not on the underside of the sheet either.
  • a method step 300 the temperature of the upper side of the sheet and/or the temperature of the underside of the sheet is determined. This can be model-based, as described above, or by means of a measurement.
  • the coolant release can be determined according to any method, preferably according to one of the methods described above. This is done according to FIG 4 in a method step 301.
  • a surface temperature is precalculated, which occurs when the quantity of coolant per unit of time calculated according to method step 301 is applied to the surface of the sheet metal or sheet metal section.
  • a method step 303 compliance with the limit temperature is checked.
  • the cooling output is redistributed or reduced in a method step 304, for example to subsequent coolant delivery devices in the direction of mass flow.
  • a coolant release is then determined again on the basis of the redistributed or reduced cooling capacity, according to method step 301. This results in a new surface temperature, which is compared with the limit temperature. If this continues to fall below, the cooling capacity is redistributed or reduced until the limit temperature is maintained.
  • the temperature of the metal sheet is preferably taken into account and it is determined how the cooling capacity of the subsequent coolant delivery devices is to be adjusted in order, for example, to dissipate a desired heat flow, to maintain the limit temperature and to achieve the desired end state.
  • the redistribution of the cooling power to the downstream coolant delivery devices causes the limit temperature to be reached on the one hand and the target state of the sheet metal to be reached after it has been cooled on the other hand.
  • the check for compliance with the limit temperature can be carried out successively, i.e. gradually for each coolant delivery device, or calculated in total for the entire cooling section.
  • a method step 305 the coolant discharges determined according to the above method are set in the cooling section.
  • This method is preferably carried out online, i.e. while the heavy plate is being cooled, so that the cooling process is optimized in real time and accordingly no rejects are generated if the temperature falls below the limit.
  • a coolant delivery in particular coolant quantity to be delivered per unit of time, is preferably already determined before the metal sheet enters the cooling section in such a way that the limit temperature is already taken into account and this is not undershot. This is less time consuming since no control loops are required. The calculated coolant output is then switched on at the correct time as the sheet passes through the cooling section.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Metal Rolling (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (9)

  1. Procédé pour le refroidissement d'une tôle (B) au moyen d'une branche de refroidissement (1),
    - dans lequel la branche de refroidissement (1) comprend une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face supérieure de tôle (O) et une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face inférieure de tôle (U),
    - dans lequel, au moyen du refroidissement, un état cible prédéfini de la tôle (B) est atteint en un point de référence lors de et/ou après la sortie de la branche de refroidissement (1),
    - dans lequel une distribution de réfrigérant est déterminée pour un premier et un deuxième dispositif de distribution de réfrigérant (2),
    - dans lequel le premier et le deuxième dispositif de distribution de réfrigérant (2) sont disposés à l'opposé par rapport à la tôle (B),
    - dans lequel la détermination de la distribution de réfrigérant pour le premier et le deuxième dispositif de distribution de réfrigérant (2) s'effectue à l'aide d'un flux de chaleur prédéfini à dissiper de la face de tôle (O, U) orientée vers le dispositif de distribution de réfrigérant (2) respectif,
    - dans lequel, pour le flux de chaleur à dissiper respectivement, une température, en particulier température de surface (To, Tu), de la face de tôle (O, U) respective est prise en considération,
    - dans lequel la détermination de la distribution de réfrigérant pour le premier et le deuxième dispositif de distribution de réfrigérant (2) s'effectue à l'aide des équations 0 = x · j oben − 1 − x ⋅ j unten
    Figure imgb0009
     et j ges = j oben + j unten ,
    Figure imgb0010
     dans lesquelles x est un facteur pouvant être prédéfini compris entre 0 et 1, joben est un flux de chaleur à dissiper de la face supérieure de la tôle, junten est un flux de chaleur à dissiper de la face inférieure de la tôle et jges est un flux de chaleur total à dissiper et à prédéfinir,
    - dans lequel, lors de la détermination de la distribution de réfrigérant, il est pris en considération le fait que, pendant la traversée de la branche de refroidissement (1), la température de la face supérieure de tôle (O) et/ou la température de la face inférieure de tôle (U) sont respectivement toujours supérieures ou égales à une température limite prédéfinie, en particulier 350 °C,
    - dans lequel un rapport du flux de chaleur à dissiper de la face supérieure de tôle (O) à la face inférieure de tôle (U) est ajusté en fonction d'une planéité, en particulier existant lors de l'arrivée dans la branche de refroidissement (1), de la tôle (B).
  2. Procédé selon la revendication 1,
    caractérisé en ce que, dans le cas d'une tôle (B) plane, en particulier arrivant de manière plane dans la branche de refroidissement (1), le rapport est essentiellement égal à un.
  3. Procédé selon la revendication 1,
    caractérisé en ce que, dans le cas d'une tôle (B) non plane, en particulier arrivant de manière non plane dans la branche de refroidissement (1), le rapport est ajusté de telle sorte que la non-planéité de la tôle après la traversée de la branche de refroidissement soit réduite par rapport à la non-planéité de la tôle (B) avant la traversée de la branche de refroidissement (1).
  4. Procédé pour le refroidissement d'une tôle (B) au moyen d'une branche de refroidissement (1),
    - dans lequel la branche de refroidissement (1) comprend une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face supérieure de tôle (O) et une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face inférieure de tôle (U),
    - dans lequel, au moyen du refroidissement, un état cible prédéfini de la tôle (B) est atteint en un point de référence lors de et/ou après la sortie de la branche de refroidissement (1),
    - dans lequel une distribution de réfrigérant est déterminée pour un premier et un deuxième dispositif de distribution de réfrigérant (2),
    - dans lequel le premier et le deuxième dispositif de distribution de réfrigérant (2) sont disposés à l'opposé par rapport à la tôle (B),
    - dans lequel la détermination de la distribution de réfrigérant pour le premier et le deuxième dispositif de distribution de réfrigérant (2) s'effectue à l'aide d'un flux de chaleur prédéfini à dissiper de la face de tôle (O, U) orientée vers le dispositif de distribution de réfrigérant (2) respectif,
    - dans lequel, pour le flux de chaleur à dissiper respectivement, une température de la face de tôle (O, U) respective est prise en considération,
    - dans lequel, pour au moins l'un des dispositifs de distribution de réfrigérant (2), la distribution de réfrigérant est déterminée indépendamment de la distribution de réfrigérant du dispositif de distribution de réfrigérant opposé par rapport à la tôle,
    - dans lequel la détermination s'effectue de telle sorte qu'une valeur numérique x soit déterminée avec 0 < x < 1 et la tôle (2) soit partagée de manière essentiellement parallèle à la face supérieure (O) ou la face inférieure (U) virtuellement en une première tôle supérieure et une deuxième tôle inférieure,
    - dans lequel x désigne le rapport de l'épaisseur de la tôle inférieure par rapport à l'épaisseur de tôle totale,
    - dans lequel la division virtuelle est entreprise en fonction d'une planéité de la tôle (B) mesurée lors de l'arrivée dans la branche de refroidissement (1),
    - dans lequel la distribution de réfrigérant est déterminée respectivement de manière séparée pour la première et la deuxième tôle,
    - dans lequel, lors de la détermination respective, un échange de chaleur entre la première tôle et la deuxième tôle n'est pas pris en considération,
    - dans lequel, lors de la détermination de la distribution de réfrigérant, il est pris en considération le fait que, pendant la traversée de la branche de refroidissement (1), la température de la face supérieure de tôle (O) et/ou la température de la face inférieure de tôle (U) sont respectivement toujours supérieures ou égales à une température limite prédéfinie, en particulier 350 °C.
  5. Procédé selon la revendication 4,
    caractérisé en ce que, pour la première tôle et la deuxième tôle, il est déterminé respectivement une variation individuelle dans le temps d'une grandeur décrivant un état énergétique de la tôle (B), à l'aide de laquelle il est déterminé un flux de chaleur à dissiper pour la face supérieure de tôle (O) respective et la face inférieure de tôle (U).
  6. Dispositif de commande et/ou de régulation (10) pour une branche de refroidissement (1), avec un code de programme lisible par machine (12), lequel comporte des instructions de commande qui, lors de leur exécution, amènent le dispositif de commande et/ou de régulation (10) à la mise en œuvre du procédé selon l'une des revendications précédentes.
  7. Code de programme lisible par machine (12) pour un dispositif de commande et/ou de régulation (10) pour une branche de refroidissement (1), le code de programme comprenant des instructions de commande qui amènent le dispositif de commande et/ou de régulation (10) à la mise en œuvre du procédé selon l'une des revendications 1 à 5.
  8. Support de stockage (11) sur lequel est stocké un code de programme lisible par machine selon la revendication 7.
  9. Branche de refroidissement (1) pour le refroidissement d'une tôle (B), la branche de refroidissement (1) comprenant une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face supérieure de tôle (O) et une pluralité de dispositifs de distribution de réfrigérant (2) pour le refroidissement d'une face inférieure de tôle (U), avec un dispositif de commande et/ou de régulation (10) selon la revendication 6, dans laquelle les dispositifs de distribution de réfrigérant (2) sont en liaison fonctionnelle avec le dispositif de commande et/ou de régulation (10) et sont commandables et/ou régulables avec celui-ci.
EP11701838.2A 2010-02-26 2011-02-04 Procédé de refroidissement d'une tôle au moyen d'une branche de refroidissement, branche de refroidissement et dispositif de contrôle et/ou de régulation pour une branche de refroidissement Active EP2539089B2 (fr)

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PCT/EP2011/051663 WO2011104103A2 (fr) 2010-02-26 2011-02-04 Procédé de refroidissement d'une tôle au moyen d'une branche de refroidissement, branche de refroidissement et dispositif de contrôle et/ou de régulation pour une branche de refroidissement

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US20120318478A1 (en) 2012-12-20
US10220425B2 (en) 2019-03-05
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CN102770221B (zh) 2015-05-20
EP2539089B1 (fr) 2014-06-25
WO2011104103A2 (fr) 2011-09-01
BR112012021178A2 (pt) 2016-05-17
KR20120139754A (ko) 2012-12-27
RU2562565C2 (ru) 2015-09-10

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