EP2376664A1 - Method for cooling a moving metal belt - Google Patents

Method for cooling a moving metal belt

Info

Publication number
EP2376664A1
EP2376664A1 EP10702914A EP10702914A EP2376664A1 EP 2376664 A1 EP2376664 A1 EP 2376664A1 EP 10702914 A EP10702914 A EP 10702914A EP 10702914 A EP10702914 A EP 10702914A EP 2376664 A1 EP2376664 A1 EP 2376664A1
Authority
EP
European Patent Office
Prior art keywords
cooling
section
band
strip
outlet
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.)
Withdrawn
Application number
EP10702914A
Other languages
German (de)
French (fr)
Inventor
Stéphane Mehrain
Christian Gaillard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Stein SA
Original Assignee
Fives Stein SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fives Stein SA filed Critical Fives Stein SA
Publication of EP2376664A1 publication Critical patent/EP2376664A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • 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
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details

Definitions

  • the present invention relates to improvements made to the cooling sections of the continuous treatment lines of metal strips, especially annealing, galvanizing or ter blanc.
  • a line of continuous treatment of metal strips is composed of a succession of heat treatment sections, in particular heating, holding, cooling, aging, etc.
  • the present invention relates to the cooling sections of the treatment lines. continuous and especially the rapid cooling sections, regardless of the cooling mode implemented, for example radiation, convection or any other cooling mode.
  • the cooling of the metal strip can be obtained by blowing a gas on the strip, for example air, but more generally a mixture of nitrogen and hydrogen.
  • the hydrogen content of the mixture is generally at least equal to 5% so as to limit the oxidation of the strip. Higher hydrogen contents are frequently used to improve cooling performance due to the gain on the exchange coefficient resulting from the physical properties of hydrogen.
  • the cooling can also be obtained by the projection on the band of a liquid.
  • This liquid is frequently water, which can be previously treated, for example to extract dissolved oxygen or mineral salts, and may contain additives to improve the heat exchange or limit the oxidation of the strip.
  • Cooling of the web may also be achieved by spraying a mixture of a gas and a liquid on the web.
  • the gas used is generally nitrogen but can also be composed of a mixture of nitrogen and hydrogen, or any other gas.
  • the coolant is frequently water, optionally treated as previously described.
  • the quality of cooling has a significant impact on the mechanical properties of the strip and its surface condition.
  • the cooling of a metal band is usually accompanied by metallurgical transformations with phase changes so as to obtain the desired mechanical properties, for example in terms of mechanical strength or drawability.
  • the nature of the phases formed, their proportion and their morphology depend on the temperatures and the cooling slopes. A good homogeneity of temperature on the bandwidth along the cooling section is thus crucial for the metallurgical transformations obtained to be those aimed at.
  • the continuous treatment lines have high band speeds, for example from 100 to 800 m / min, the band traveling on transport rollers. Guiding the moving tape in the different sections of the line is crucial to prevent the tape from coming into contact with the walls. Length differences in the bandwidth, for example long or short banks from the center of the band, affect the quality of the web guidance. It is understood that a difference in cooling intensity over the bandwidth leads to a difference in temperature and therefore a contraction difference of the band over its width having an impact on the guidance of the band.
  • the band After leaving the cooling section, the band travels in the downstream sections where the thermal path of the strip continues. It can for example cross an aging section with a maintenance of it at an appropriate temperature for several seconds to several minutes. During its passage in the section of the furnace located downstream of the cooling section, the band will see its average temperature evolve with a rise in temperature if it is a heating section or a temperature drop. it is a cooling section. The average temperature of the strip may also be kept constant if it is a holding section. Depending on the nature, the geometry, the means implemented for heating or cooling and the control mode of the section located downstream of the cooling section, the transverse temperature profile of the strip may change between the inlet and the outlet. the output of this section due to a different heat exchange on the bandwidth.
  • a perfectly homogeneous temperature band at the outlet of the cooling section may have warmer or colder edges than the center at the outlet of the downstream chamber. It is easy to understand that the temperature profile of the strip at the outlet of the section situated downstream of the The cooling section will also be linked to the temperature profile of the strip at the outlet of the cooling section. It is therefore possible to influence the temperature profile of the strip at the outlet of the downstream section according to the temperature profile of the strip at the outlet of the cooling section.
  • the purpose of the invention is, above all, to improve the cooling control over the bandwidth to meet these requirements, so that the cooling curve at each point of the width of the strip along the cooling section that is the target.
  • the invention thus relates to a method for cooling a moving metal strip, in a continuous treatment line, by spraying a gas, a liquid or a mixture consisting of a gas and a liquid, the treatment line comprising a cooling section followed by a downstream section having a thermal effect on the strip, the inlet of the downstream section corresponding to the outlet of the cooling section.
  • the method of the invention is characterized in that:
  • the change in the transverse temperature profile of the band between the input and the output of the downstream section is evaluated in real time by means of a calculator from mathematical models according to the format of the band, the speed of the scrolling and the transverse temperature profile of the band at the inlet of the downstream section,
  • a transverse temperature profile adapted to the input of the downstream section is obtained from a transverse profile of the desired temperature at the outlet of the downstream section to obtain the desired profile at the output
  • the cooling capacity is thus adjusted by taking into account in advance the future evolution of the transverse temperature profile of the strip during its stay in the section of the line located downstream of the cooling section.
  • the control of the temperature profile over the width of the web resulting from the adjustment of the cooling capacity to the bandwidth is intended to allow to improve the guidance of the web on the transport rollers by obtaining banks long or short compared to the center of the strip.
  • Adjustment of the cooling capacity can be achieved by splitting a cooling device into a plurality of units in the width direction and in the length direction of the cooling section. Each unit may be provided with regulating means to vary its cooling capacity independently of the other units.
  • the control of the regulating members can be ensured from a computer in which is installed a suitable program for controlling the cooling units.
  • the computer receives information provided by temperature sensors distributed in the cooling section and by temperature sensors distributed in the downstream section, and the computer, based on this information, checks whether the cooling is carried out. the desired manner, and possibly corrects the progress of the cooling, according to the width of the strip and along its length to obtain the desired profile.
  • Fig. 1 is a schematic vertical section of a section of cooling and a downstream section of a line of continuous treatment of a metal strip.
  • FIG. 2 is a horizontal section along line H-II of FIG. 1, of the cooling section
  • FIG. 3 is a diagram illustrating the variations of the transverse temperature profile of the strip, plotted on the ordinate, according to the width of the strip on the abscissa.
  • FIG. 1 a cooling section 1 of a line of continuous treatment of a metal strip 2 scrolling.
  • the cooling section 1 is vertical but it could be horizontal, or inclined relative to the vertical.
  • the band 2 passes on return rollers 3 to engage in a downstream section 4 also shown vertical in the example, but which can be arranged differently, especially horizontally.
  • the width (FIG 2) of the strip 2 is perpendicular to the plane of FIG. 1.
  • the cooling of the strip 2 is ensured by projecting on each side of the strip a gas, a liquid or a mixture consisting of a gas and a liquid, with the aid of nozzles 5 distributed in the walls of section 1 parallel to the strip 2, on each side of this strip.
  • the nozzles 5 are oriented so as to direct at least one jet of cooling fluid against the band 2, in particular in a direction substantially orthogonal to this band.
  • the nozzles 5 are supplied with cooling fluid by ducts 6.
  • the inlet 4a of the downstream section corresponds to the outlet 1b of the cooling section.
  • the band 2 has a transverse profile of temperature P (FIG 3) which depends on the zone considered of the band 2.
  • the profile P represents the variation of the temperature of a point of the band along its width, which corresponds to a orthogonal direction in the direction of movement of the band.
  • the changing the transverse temperature profile between the inlet 4a and the outlet 4b of the downstream section depending on the format of the strip 2, in particular according to its width, its thickness and its nature, and as a function of the transverse temperature profile of the strip at the inlet 4a of the downstream section.
  • This cross-sectional profile change can be evaluated from mathematical models for calculating thermal exchanges between band 2 and section 4, possibly supplemented by previous measurements. Then, from a desired transverse profile P4b (FIG. 3) of the outlet temperature 4b of the downstream section, the transverse temperature profile P4a at the inlet 4a of the downstream section is deduced by a reverse approach. which is adapted to obtain the desired profile P4b at the output.
  • the desired P4b profile at the output is a nominative profile according to the width, that is to say that the temperature of the strip is constant from one shore to the other.
  • the downstream section 4 has heating on the strip more marked on the left bank than in the center and on the other side.
  • the profile P4a at the entrance of the section, adapted to give the profile P4b, will have a convex shape upward on the left bank, corresponding to a lower band temperature on the left bank.
  • the transverse profile P4a at the inlet of the downstream section 4a which is also the profile P1b at the outlet 1b of the cooling section
  • the transverse temperature profile P1a is known. at the entrance of the cooling section.
  • the profile P1a is concave upwards, which corresponds to strip edges that are hotter than the center.
  • the transverse temperature profile P1a at the inlet is known using temperature sensors distributed over the width of the strip, at the inlet 1a.
  • Adjustment of cooling capacity over the width of the web can be achieved by many known means.
  • this adjustment of the cooling capacity is obtained by splitting a cooling device R into a plurality of Ryz units in the direction of the width and in the lengthwise direction of the cooling section 1, that is to say in the vertical direction according to the example considered.
  • the index y of Ryz can vary from 1 to m, m being the number of units according to the width of the band, while the index z can vary from 1 to n, n being the number of units following the length of the cooling section 1.
  • each Ryz unit is equipped with a member, for example a control valve 7, for varying the flow rate of the cooling means, gas, liquid or gas / liquid mixture.
  • a control valve may be required on each fluid.
  • Each unit is thus equipped with the necessary equipment to vary its cooling capacity independently of the other units.
  • each cooling unit Ryz comprises two nozzles 5, having the same position according to the width, but offset vertically along the length. The nozzles 5 of the same unit are fed in parallel from the same pipe 6 on which is disposed a control valve 7 controlling the flow rate of the gas or the flow rate of the cooling liquid ⁇
  • the control of the regulating members, such as the valves 7 is provided from a computer A in which is installed a suitable program for controlling the cooling units.
  • the computer A further receives information provided by temperature sensors 8 distributed in the cooling section and by temperature sensors 9 distributed in the downstream section.
  • the computer A from this information, checks whether the cooling is carried out in the desired manner, and possibly corrects the progress of cooling, according to the width of the strip and along its length to obtain the desired profile.
  • each unit may for example be equipped with a flow control member only on the gas, the flow rate of the liquid being constant, or a flow control member only on the liquid, the gas flow rate being constant, or two control members for varying the gas flow rate and the flow rate of the liquid.
  • Each unit may also be equipped with a device G for varying the temperature of the gas, the liquid or the mixture consisting of a gas and a liquid so as to vary its cooling capacity.
  • This variation of the temperature of the cooling means can be carried out for a constant flow rate of the cooling means or combined with a variation of the flow rate of the cooling means so as to increase the flexibility of regulation of the installation.
  • section 4 situated downstream of the cooling section 1 is a heating section which leads to a higher temperature of one of the banks of the 5 ° C band, for example the left bank, whereas the a homogeneous temperature is sought at the outlet 4b thereof,
  • the cooling parameters are adjusted so that a greater cooling capacity on the bank considered, the left bank in the example, lead to an additional cooling of 5 ° C thereof relative to the rest of the bandwidth.
  • the cooling parameters are adjusted so that a cooling capacity lower on the bank considered to lead to a lower cooling thereof of 10 ° C relative to the remainder of the bandwidth.
  • the program (s) installed in the computer A are established with mathematical means exploiting models based on your physical laws of thermal exchanges, and allow a good simulation of the temperature variations of a band 2 during its passage in a section of a continuous line according to the nature of the latter and its thermal state. It is therefore possible to predict the evolution of the temperature profile of the strip along this section and adjust accordingly the operating parameters of each unit of the cooling section.
  • Tests carried out during the commissioning of the continuous line are also used to calibrate the thermal model and increase the accuracy of the device by improving the program installed in the computer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The present invention relates to a method for cooling a moving metal belt (2) in a continuous processing line by spraying a gas, a liquid, or a mixture consisting of gas and liquid onto the belt, the processing line including a cooling section (1) followed by a downstream section (4), the inlet (4a) of the downstream section corresponding to the outlet (1b) of the cooling section, wherein according to said method: the change in the temperature cross-section of the belt between the inlet (4a) and the outlet (4b) of the downstream section (4) is evaluated; the temperature cross-section suitable for the inlet of the downstream section is deduced, on the basis of a desired temperature cross-section at the outlet of the downstream section (4), in order to obtain the desired cross-section at the outlet; and the cooling capacity of the cooling section (1) is adjusted according to the width of the belt and over the length of the cooling section, while taking into the account the temperature cross-section of the belt at the inlet of the cooling section, so that the cooling makes it possible to obtain the aforementioned temperature cross-section at the outlet of the cooling section.

Description

PROCEDE DE REFROIDISSEMENT D'UNE BANDE METALLIQUE EN DEFILEMENT. METHOD FOR COOLING A TILT METAL STRIP
La présente invention concerne des perfectionnements apportés aux sections de refroidissement des lignes de traitement en continu de bandes métalliques, notamment de recuit, de galvanisation ou de ter blanc.The present invention relates to improvements made to the cooling sections of the continuous treatment lines of metal strips, especially annealing, galvanizing or ter blanc.
Une ligne de traitement en continu de bandes métalliques est composée d'une succession de sections de traitement thermique, notamment de chauffage, de maintien, de refroidissement, de vieillissement, etc.. La présente invention concerne les sections de refroidissement des lignes de traitement en continu et plus particulièrement les sections de refroidissement rapide, quel que soit le mode de refroidissement mis en œuvre, par exemple le rayonnement, la convection ou tout autre mode de refroidissement. Le refroidissement de la bande métallique peut être obtenu par le soufflage sur la bande d'un gaz, par exemple de l'air, mais plus généralement un mélange d'azote et d'hydrogène. La teneur en hydrogène du mélange est généralement au moins égale à 5% de sorte de limiter l'oxydation de la bande. Des teneurs plus élevées en hydrogène sont fréquemment employées pour améliorer les performances en refroidissement en raison du gain sur le coefficient d'échange résultant des propriétés physiques de l'hydrogène.A line of continuous treatment of metal strips is composed of a succession of heat treatment sections, in particular heating, holding, cooling, aging, etc. The present invention relates to the cooling sections of the treatment lines. continuous and especially the rapid cooling sections, regardless of the cooling mode implemented, for example radiation, convection or any other cooling mode. The cooling of the metal strip can be obtained by blowing a gas on the strip, for example air, but more generally a mixture of nitrogen and hydrogen. The hydrogen content of the mixture is generally at least equal to 5% so as to limit the oxidation of the strip. Higher hydrogen contents are frequently used to improve cooling performance due to the gain on the exchange coefficient resulting from the physical properties of hydrogen.
Afin d'obtenir des pentes de refroidissement de la bande encore plus importantes, le refroidissement peut également être obtenu par la projection sur la bande d'un liquide. Ce liquide est fréquemment de l'eau, pouvant être préalablement traitée, par exemple pour en extraire l'oxygène dissous ou les sels minéraux, et pouvant contenir des additifs pour améliorer l'échange thermique ou limiter l'oxydation de la bande.In order to obtain even greater cooling slopes of the band, the cooling can also be obtained by the projection on the band of a liquid. This liquid is frequently water, which can be previously treated, for example to extract dissolved oxygen or mineral salts, and may contain additives to improve the heat exchange or limit the oxidation of the strip.
Le refroidissement de la bande peut également être obtenu par la projection sur !a bande d'un mélange constitué d'un gaz et d'un liquide. Le gaz mis en œuvre est généralement de l'azote mais peut également être composé d'un mélange d'azote et d'hydrogène, ou tout autre gaz. Le liquide de refroidissement est fréquemment de l'eau, éventuellement traitée comme décrit précédemment.Cooling of the web may also be achieved by spraying a mixture of a gas and a liquid on the web. The gas used is generally nitrogen but can also be composed of a mixture of nitrogen and hydrogen, or any other gas. The coolant is frequently water, optionally treated as previously described.
La qualité du refroidissement a un impact important sur les propriétés mécaniques de la bande et sur son état de surface. Selon les températures de début et de fin de refroidissement et les pentes de refroidissement, le refroidissement d'une bande métallique s'accompagne généralement de transformations métallurgiques avec changements de phases de sorte d'obtenir les propriétés mécaniques visées, par exemple en terme de résistance mécanique ou d'emboutissabilité. La nature des phases formées, leur proportion et leur morphologie dépendent des températures et des pentes de refroidissement. Une bonne homogénéité de température sur la largeur de bande le long de la section de refroidissement est ainsi cruciale pour que les transformations métallurgiques obtenues soient celles visées.The quality of cooling has a significant impact on the mechanical properties of the strip and its surface condition. Depending on the start and end temperatures of cooling and cooling slopes, the cooling of a metal band is usually accompanied by metallurgical transformations with phase changes so as to obtain the desired mechanical properties, for example in terms of mechanical strength or drawability. The nature of the phases formed, their proportion and their morphology depend on the temperatures and the cooling slopes. A good homogeneity of temperature on the bandwidth along the cooling section is thus crucial for the metallurgical transformations obtained to be those aimed at.
Les lignes de traitement en continu ont des vitesses de défilement de la bande élevée, par exemple de 100 à 800 m/min, la bande circulant sur des rouleaux de transport. Le guidage de la bande en défilement dans les différentes sections de la ligne est crucial pour éviter que la bande ne vienne au contact des murs. Des différences de longueur sur la largeur de bande, avec par exemple des rives longues ou courtes par rapport au centre de la bande, influent sur la qualité du guidage de la bande. On comprend qu'une différence d'intensité de refroidissement sur la largeur de bande conduit à une différence de température et donc une différence de contraction de la bande sur sa largeur ayant un impact sur le guidage de la bande.The continuous treatment lines have high band speeds, for example from 100 to 800 m / min, the band traveling on transport rollers. Guiding the moving tape in the different sections of the line is crucial to prevent the tape from coming into contact with the walls. Length differences in the bandwidth, for example long or short banks from the center of the band, affect the quality of the web guidance. It is understood that a difference in cooling intensity over the bandwidth leads to a difference in temperature and therefore a contraction difference of the band over its width having an impact on the guidance of the band.
Après sa sortie de la section de refroidissement, la bande circule dans les sections situées en aval où se poursuit le chemin thermique de la bande. Elle peut par exemple traverser une section de vieillissement avec un maintien de celle-ci à une température appropriée pendant plusieurs secondes à plusieurs minutes. Au cours de son passage dans la section du four située en aval de la section de refroidissement, la bande va voir sa température moyenne évoluer avec une élévation de température s'il s'agit d'une section de chauffage ou une baisse de température s'il s'agit d'une section de refroidissement. La température moyenne de la bande pourra également être maintenue constante s'ii s'agit d'une section de maintien. Selon la nature, la géométrie, les moyens mis en œuvre pour le chauffage ou le refroidissement et le mode de contrôle de la section située en aval de la section de refroidissement, le profil de température transversal de la bande pourra évoluer entre l'entrée et la sortie de cette section en raison d'un échange thermique différent sur la iargeur de bande. Ainsi, une bande parfaitement homogène en température en sortie de la section de refroidissement pourra avoir des rives plus chaudes ou plus froides que le centre à ia sortie de la chambre aval. On comprend aisément que le profil de température de la bande à la sortie de la section située en aval de la section de refroidissement sera égaiement lié au profil de température de la bande en sortie de la section de refroidissement. Il est donc possible d'influer sur le profil de température de la bande en sortie de la section aval selon le profil de température de la bande en sortie de la section de refroidissement.After leaving the cooling section, the band travels in the downstream sections where the thermal path of the strip continues. It can for example cross an aging section with a maintenance of it at an appropriate temperature for several seconds to several minutes. During its passage in the section of the furnace located downstream of the cooling section, the band will see its average temperature evolve with a rise in temperature if it is a heating section or a temperature drop. it is a cooling section. The average temperature of the strip may also be kept constant if it is a holding section. Depending on the nature, the geometry, the means implemented for heating or cooling and the control mode of the section located downstream of the cooling section, the transverse temperature profile of the strip may change between the inlet and the outlet. the output of this section due to a different heat exchange on the bandwidth. Thus, a perfectly homogeneous temperature band at the outlet of the cooling section may have warmer or colder edges than the center at the outlet of the downstream chamber. It is easy to understand that the temperature profile of the strip at the outlet of the section situated downstream of the The cooling section will also be linked to the temperature profile of the strip at the outlet of the cooling section. It is therefore possible to influence the temperature profile of the strip at the outlet of the downstream section according to the temperature profile of the strip at the outlet of the cooling section.
II apparaît que le contrôle du refroidissement sur la largeur de bande, sur toute la longueur de la section de refroidissement, est déterminant afin d'obtenir des propriétés mécaniques homogènes sur la largeur de bande, éviter des défauts de guidage de bande et anticiper l'évolution du profil de température de la bande dans la section située en aval. Ce contrôle est particulièrement crucial pour les bandes larges et de faible épaisseur.It appears that the cooling control over the bandwidth, over the entire length of the cooling section, is decisive in order to obtain homogeneous mechanical properties over the bandwidth, to avoid band guiding defects and to anticipate the evolution of the temperature profile of the strip in the section downstream. This control is particularly crucial for wide and thin strips.
L'invention a pour but, surtout, d'améliorer le contrôle du refroidissement sur la largeur de bande pour répondre à ces exigences, de sorte que la courbe de refroidissement en chaque point de la largeur de la bande le long de la section de refroidissement soit celle visée.The purpose of the invention is, above all, to improve the cooling control over the bandwidth to meet these requirements, so that the cooling curve at each point of the width of the strip along the cooling section that is the target.
L'invention concerne ainsi un procédé de refroidissement d'une bande métallique en défilement, dans une ligne de traitement en continu, par projection sur la bande d'un gaz, d'un liquide ou d'un mélange constitué d'un gaz et d'un liquide, la ligne de traitement comprenant une section de refroidissement suivie d'une section aval ayant un effet thermique sur la bande, l'entrée de la section aval correspondant à la sortie de la section de refroidissement . Le procédé de l'invention est caractérisé en ce que :The invention thus relates to a method for cooling a moving metal strip, in a continuous treatment line, by spraying a gas, a liquid or a mixture consisting of a gas and a liquid, the treatment line comprising a cooling section followed by a downstream section having a thermal effect on the strip, the inlet of the downstream section corresponding to the outlet of the cooling section. The method of the invention is characterized in that:
- on évalue en temps réel le changement du profil transversal de température de la bande entre l'entrée et la sortie de la section aval au moyen d'un calculateur à partir de modèles mathématiques en fonction du format de la bande, de la vitesse de défilement et du profil transversal de température de ia bande à l'entrée de la section aval,the change in the transverse temperature profile of the band between the input and the output of the downstream section is evaluated in real time by means of a calculator from mathematical models according to the format of the band, the speed of the scrolling and the transverse temperature profile of the band at the inlet of the downstream section,
- on déduit, à partir d'un profil transversal de température souhaité en sortie de la section aval, le profil transversal de température adapté à l'entrée de la section aval pour l'obtention du profil souhaité en sortie,a transverse temperature profile adapted to the input of the downstream section is obtained from a transverse profile of the desired temperature at the outlet of the downstream section to obtain the desired profile at the output,
- et on ajuste en temps réel la capacité de refroidissement de la section de refroidissement suivant la largeur de la bande et sur la longueur de la section de refroidissement, par un système de contrôle et de commande de la ligne au moyen du calculateur à partir de modèles mathématiques prenant en compte le profil de température transversal de la bande à l'entrée de la section de refroidissement et l'évolution des échanges thermiques entre la bande et son environnement dans la section de refroidissement, de telle sorte que le refroidissement permette d'obtenir, en sortie de la section de refroidissement, le susdit profil transversa! de température adapté.and adjusting in real time the cooling capacity of the cooling section according to the width of the strip and the length of the cooling section, by a system for controlling and controlling the line by means of the calculator starting from mathematical models taking into account the temperature profile transverse of the band at the inlet of the cooling section and the evolution of the thermal exchanges between the band and its environment in the cooling section, so that the cooling makes it possible to obtain, at the outlet of the cooling section , the aforesaid transversal profile! adapted temperature.
Selon l'invention, la capacité de refroidissement est ainsi ajustée en prenant en compte par anticipation l'évolution future du profil de température transversal de la bande pendant son séjour dans la section de la ligne située en aval de la section de refroidissement.According to the invention, the cooling capacity is thus adjusted by taking into account in advance the future evolution of the transverse temperature profile of the strip during its stay in the section of the line located downstream of the cooling section.
Le contrôle du profil de température sur la largeur de la bande résultant de l'ajustement de la capacité de refroidissement sur la largeur de bande est prévu pour permettre d'améliorer le guidage de la bande sur les rouleaux de transport par l'obtention de rives longues ou courtes par rapport au centre de la bande.The control of the temperature profile over the width of the web resulting from the adjustment of the cooling capacity to the bandwidth is intended to allow to improve the guidance of the web on the transport rollers by obtaining banks long or short compared to the center of the strip.
L'ajustement de la capacité de refroidissement peut être obtenu par un fractionnement d'un dispositif de refroidissement en une pluralité d'unités dans le sens de la largeur et dans le sens de la longueur de la section de refroidissement. Chaque unité peut être munie d'organes de régulation pour faire varier sa capacité de refroidissement indépendamment des autres unités.Adjustment of the cooling capacity can be achieved by splitting a cooling device into a plurality of units in the width direction and in the length direction of the cooling section. Each unit may be provided with regulating means to vary its cooling capacity independently of the other units.
La commande des organes de régulation peut être assurée à partir d'un calculateur dans lequel est installé un programme approprié de commande des unités de refroidissement. Avantageusement, le calculateur reçoit des informations fournies par des capteurs de température répartis dans ia section de refroidissement et par des capteurs de température répartis dans la section aval, et !e calculateur, à partir de ces informations, vérifie si le refroidissement s'effectue de la manière souhaitée, et éventuellement corrige le déroulement du refroidissement, selon la largeur de la bande et suivant sa longueur pour obtenir le profil souhaité.The control of the regulating members can be ensured from a computer in which is installed a suitable program for controlling the cooling units. Advantageously, the computer receives information provided by temperature sensors distributed in the cooling section and by temperature sensors distributed in the downstream section, and the computer, based on this information, checks whether the cooling is carried out. the desired manner, and possibly corrects the progress of the cooling, according to the width of the strip and along its length to obtain the desired profile.
L'invention consiste, mises à part les dispositions exposées ci- dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci-après à propos d'un exemple de réalisation décrit avec référence au dessin annexé, mais qui n'est nullement limitatif. Sur ce dessin :The invention consists, apart from the arrangements described above, in a certain number of other arrangements which will be more explicitly discussed hereinafter with reference to an exemplary embodiment described with reference to the appended drawing, but which is in no way limiting. On this drawing :
Fig. 1 est une coupe verticale schématique d'une section de refroidissement et d'une section aval d'une ligne de traitement en continu d'une bande métallique.Fig. 1 is a schematic vertical section of a section of cooling and a downstream section of a line of continuous treatment of a metal strip.
Fig. 2 est une section horizontale suivant la ligne H-Il de Fig. 1 , de la section de refroidissement, et Fig. 3 est un diagramme illustrant les variations du profil transversal de température de la bande, porté en ordonnée, selon la largeur de la bande portée en abscisse.Fig. 2 is a horizontal section along line H-II of FIG. 1, of the cooling section, and FIG. 3 is a diagram illustrating the variations of the transverse temperature profile of the strip, plotted on the ordinate, according to the width of the strip on the abscissa.
En se reportant aux Fig.1 et 2 du dessin, on peut voir une section de refroidissement 1 d'une ligne de traitement en continu d'une bande métallique 2 en défilement. Seion l'exemple représenté, la section de refroidissement 1 est verticale mais elle pourrait être horizontale, ou inclinée par rapport à la verticale. En partie haute de la section 1 , la bande 2 passe sur des rouleaux de renvoi 3 pour s'engager dans une section aval 4 également représentée verticale dans l'exemple, mais qui peut être disposée autrement, notamment à l'horizontale. La largeur (Fig. 2) de la bande 2 est perpendiculaire au plan de Fig. 1.Referring to Fig.1 and 2 of the drawing, there can be seen a cooling section 1 of a line of continuous treatment of a metal strip 2 scrolling. Seion the example shown, the cooling section 1 is vertical but it could be horizontal, or inclined relative to the vertical. In the upper part of section 1, the band 2 passes on return rollers 3 to engage in a downstream section 4 also shown vertical in the example, but which can be arranged differently, especially horizontally. The width (FIG 2) of the strip 2 is perpendicular to the plane of FIG. 1.
Le refroidissement de la bande 2 est assuré par projection sur chacune des faces de la bande d'un gaz, d'un liquide ou d'un mélange constitué d'un gaz et d'un liquide, à l'aide de buses 5 réparties dans les parois de la section 1 parallèles à la bande 2, de chaque côté de cette bande. Les buses 5 sont orientées de manière à diriger au moins un jet de fluide de refroidissement contre la bande 2, notamment selon une direction sensiblement orthogonale à cette bande. Les buses 5 sont alimentées en fluide de refroidissement par des conduites 6.The cooling of the strip 2 is ensured by projecting on each side of the strip a gas, a liquid or a mixture consisting of a gas and a liquid, with the aid of nozzles 5 distributed in the walls of section 1 parallel to the strip 2, on each side of this strip. The nozzles 5 are oriented so as to direct at least one jet of cooling fluid against the band 2, in particular in a direction substantially orthogonal to this band. The nozzles 5 are supplied with cooling fluid by ducts 6.
L'entrée 4a de la section aval correspond à la sortie 1 b de la section de refroidissement. La bande 2 présente un profil transversal de température P (Fig. 3) qui dépend de la zone considérée de la bande 2. Le profil P représente la variation de la température d'un point de la bande suivant sa largeur, qui correspond à une direction orthogonale au sens de déplacement de la bande.The inlet 4a of the downstream section corresponds to the outlet 1b of the cooling section. The band 2 has a transverse profile of temperature P (FIG 3) which depends on the zone considered of the band 2. The profile P represents the variation of the temperature of a point of the band along its width, which corresponds to a orthogonal direction in the direction of movement of the band.
Selon l'invention, en fonction du format de la bande 2, en particulier selon sa largeur, son épaisseur et sa nature, et en fonction du profil transversal de température de la bande à l'entrée 4a de la section aval, on évalue le changement du profil transversal de température entre l'entrée 4a et la sortie 4b de la section aval.According to the invention, depending on the format of the strip 2, in particular according to its width, its thickness and its nature, and as a function of the transverse temperature profile of the strip at the inlet 4a of the downstream section, the changing the transverse temperature profile between the inlet 4a and the outlet 4b of the downstream section.
Ce changement de profil transversal peut être évalué à partir de modèles mathématiques permettant de calculer les échanges thermiques entre la bande 2 et la section 4, éventuellement complété de mesures antérieures. Ensuite, on déduit, par une démarche inverse, à partir d'un profil transversal souhaité P4b (Fig. 3) de température en sortie 4b de la section aval, le profil transversal P4a de température, à l'entrée 4a de la section aval, qui est adapté pour l'obtention du profil souhaité P4b en sortie. Dans l'exemple schématique de Fig. 3, le profil P4b souhaité en sortie est un profil nomogène suivant la largeur, c'est-a-dire que la température de la bande est constante d'une rive à l'autre. Dans cet exemple !a section aval 4 exerce un chauffage sur la bande plus marqué sur la rive gauche qu'au centre et sur l'autre rive. Le profil P4a à l'entrée de la section, adapté pour donner le profil P4b, présentera une forme convexe vers le haut sur la rive gauche, correspondant à une température de bande moindre sur la rive gauche.This cross-sectional profile change can be evaluated from mathematical models for calculating thermal exchanges between band 2 and section 4, possibly supplemented by previous measurements. Then, from a desired transverse profile P4b (FIG. 3) of the outlet temperature 4b of the downstream section, the transverse temperature profile P4a at the inlet 4a of the downstream section is deduced by a reverse approach. which is adapted to obtain the desired profile P4b at the output. In the schematic example of FIG. 3, the desired P4b profile at the output is a nominative profile according to the width, that is to say that the temperature of the strip is constant from one shore to the other. In this example, the downstream section 4 has heating on the strip more marked on the left bank than in the center and on the other side. The profile P4a at the entrance of the section, adapted to give the profile P4b, will have a convex shape upward on the left bank, corresponding to a lower band temperature on the left bank.
D'une part on dispose du profil transversal P4a à l'entrée de la section aval 4a, qui est aussi le profil P1b à la sortie 1 b de la section de refroidissement, et d'autre part on connaît le profil transversal de température P1a à l'entrée de la section de refroidissement. Selon l'exemple de Fig.3 le profil P1a est concave vers le haut, ce qui correspond à des rives de bande plus chaudes que ie centre. On ajuste alors la capacité de refroidissement de la section de refroidissement 1 suivant ia largeur de la bande 2 et seîon la longueur de la section de refroidissement, pour obtenir, à partir du profil d'entrée P1a, le profil de sortie P1b = P4a. Le profil transversal de température P1a à l'entrée est connu à l'aide de capteurs de température répartis sur la largeur de la bande, à l'entrée 1a.On the one hand we have the transverse profile P4a at the inlet of the downstream section 4a, which is also the profile P1b at the outlet 1b of the cooling section, and on the other hand the transverse temperature profile P1a is known. at the entrance of the cooling section. According to the example of FIG. 3, the profile P1a is concave upwards, which corresponds to strip edges that are hotter than the center. The cooling capacity of the cooling section 1 along the width of the strip 2 and the length of the cooling section is then adjusted to obtain, from the input profile P1a, the output profile P1b = P4a. The transverse temperature profile P1a at the inlet is known using temperature sensors distributed over the width of the strip, at the inlet 1a.
L'ajustement de la capacité de refroidissement sur la largeur de la bande peut être obtenu par de nombreux moyens connus. Avantageusement, cet ajustement de la capacité de refroidissement est obtenu par un fractionnement d'un dispositif de refroidissement R en une pluralité d'unités Ryz dans le sens de la largeur et dans le sens de la longueur de la section de refroidissement 1 , c'est-à-dire dans le sens vertical selon l'exemple considéré. L'indice y de Ryz peut varier de 1 à m, m étant le nombre d'unités selon la largeur de la bande, tandis que l'indice z peut varier de 1 à n, n étant le nombre d'unités suivant la longueur de la section de refroidissement 1.Adjustment of cooling capacity over the width of the web can be achieved by many known means. Advantageously, this adjustment of the cooling capacity is obtained by splitting a cooling device R into a plurality of Ryz units in the direction of the width and in the lengthwise direction of the cooling section 1, that is to say in the vertical direction according to the example considered. The index y of Ryz can vary from 1 to m, m being the number of units according to the width of the band, while the index z can vary from 1 to n, n being the number of units following the length of the cooling section 1.
D'une manière générale, chaque unité Ryz est équipée d'un organe, par exemple une vanne de régulation 7, permettant de faire varier le débit du moyen de refroidissement, gaz, liquide ou mélange gaz/liquide. Dans le cas d'un mélange gaz/liquide, une vanne de régulation peut être nécessaire sur chaque fluide. Chaque unité est ainsi munie de l'équipement nécessaire pour faire varier sa capacité de refroidissement indépendamment des autres unités. Dans l'exemple illustré sur Fig. 1 , chaque unité de refroidissement Ryz comprend deux buses 5, ayant la même position selon la largeur, mais décalées verticalement suivant la longueur. Les buses 5 d'une même unité sont alimentées en parallèle à partir d'une même conduite 6 sur laquelle est disposée une vanne de régulation 7 contrôlant le débit de gaz ou le débit du liquide de refroid issement^ In general, each Ryz unit is equipped with a member, for example a control valve 7, for varying the flow rate of the cooling means, gas, liquid or gas / liquid mixture. In the case of a gas / liquid mixture, a control valve may be required on each fluid. Each unit is thus equipped with the necessary equipment to vary its cooling capacity independently of the other units. In the example illustrated in FIG. 1, each cooling unit Ryz comprises two nozzles 5, having the same position according to the width, but offset vertically along the length. The nozzles 5 of the same unit are fed in parallel from the same pipe 6 on which is disposed a control valve 7 controlling the flow rate of the gas or the flow rate of the cooling liquid ^
La commande des organes de régulation, tels que les vannes 7 est assurée à partir d'un calculateur A dans lequel est installé un programme approprié de commande des unités de refroidissement. Le calculateur A reçoit en outre des informations fournies par des capteurs de température 8 répartis dans la section de refroidissement et par des capteurs de température 9 répartis dans la section aval. Le calculateur A, à partir de ces informations, vérifie si le refroidissement s'effectue de la manière souhaitée, et éventuellement corrige le déroulement du refroidissement, selon la largeur de la bande et suivant sa longueur pour obtenir le profil souhaité. Dans le cas d'un refroidissement par un mélange constitué d'un gaz et d'un liquide, chaque unité pourra par exemple être équipée d'un organe de contrôle du débit uniquement sur le gaz, le débit du liquide étant constant, ou d'un organe de contrôle du débit uniquement sur le liquide, le débit de gaz étant constant, ou de deux organes de contrôle permettant de faire varier le débit de gaz et le débit du liquide.The control of the regulating members, such as the valves 7 is provided from a computer A in which is installed a suitable program for controlling the cooling units. The computer A further receives information provided by temperature sensors 8 distributed in the cooling section and by temperature sensors 9 distributed in the downstream section. The computer A, from this information, checks whether the cooling is carried out in the desired manner, and possibly corrects the progress of cooling, according to the width of the strip and along its length to obtain the desired profile. In the case of cooling by a mixture consisting of a gas and a liquid, each unit may for example be equipped with a flow control member only on the gas, the flow rate of the liquid being constant, or a flow control member only on the liquid, the gas flow rate being constant, or two control members for varying the gas flow rate and the flow rate of the liquid.
Chaque unité peut également être équipée d'un dispositif G permettant de faire varier la température du gaz, du liquide ou du mélange constitué d'un gaz et d'un liquide de sorte de faire varier sa capacité de refroidissement. Cette variation de la température du moyen de refroidissement pourra être réalisée pour un débit constant du moyen de refroidissement ou combinée à une variation du débit du moyen de refroidissement de sorte d'accroître la souplesse de régulation de l'installation. A titre d'exemple :Each unit may also be equipped with a device G for varying the temperature of the gas, the liquid or the mixture consisting of a gas and a liquid so as to vary its cooling capacity. This variation of the temperature of the cooling means can be carried out for a constant flow rate of the cooling means or combined with a variation of the flow rate of the cooling means so as to increase the flexibility of regulation of the installation. For exemple :
- si la section 4 située en aval de la section de refroidissement 1 est une section de chauffage qui conduit à une température plus élevée de l'une des rives de la bande de 5°C, par exemple la rive gauche, alors que l'on recherche une température homogène en sortie 4b de celle-ci,if the section 4 situated downstream of the cooling section 1 is a heating section which leads to a higher temperature of one of the banks of the 5 ° C band, for example the left bank, whereas the a homogeneous temperature is sought at the outlet 4b thereof,
- et si la bande 2 entre parfaitement homogène en température sur la largeur dans la section de refroidissement 1 , selon l'invention, les paramètres de refroidissement sont ajustés de sorte qu'une capacité de refroidissement plus importante sur la rive considérée, la rive gauche dans l'exemple, conduise à un refroidissement supplémentaire de 5°C de celle-ci par rapport au reste de la largeur de bande. Selon une variante de cet exempte :and if the strip 2 is perfectly temperature-uniform over the width in the cooling section 1, according to the invention, the cooling parameters are adjusted so that a greater cooling capacity on the bank considered, the left bank in the example, lead to an additional cooling of 5 ° C thereof relative to the rest of the bandwidth. According to a variant of this example:
- si la bande 2 entre à présent dans ia section de refroidissement 1 asi&c la rive considérée plus froide de 100C que te reste de ia bande, selon l'invention, les paramètres de refroidissement sont ajustés de sorte qu'une capacité de refroidissement plus faible sur la rive considérée conduise â un refroidissement moindre de ceîîe-ci de 1O"C par rapport au reste de la largeur de bande.if the strip 2 now enters the cooling section 1 as the edge considered to be colder by 10 ° C. than the remainder of the strip, according to the invention, the cooling parameters are adjusted so that a cooling capacity lower on the bank considered to lead to a lower cooling thereof of 10 ° C relative to the remainder of the bandwidth.
Le ou les programmes installés dans le calculateur A sont établis avec des moyens mathématiques exploitant des modèles basés sur tes lois physiques des échanges thermiques, et permettent une bonne simulation des variations de température d'une bande 2 lors de son passage dans une section d'une ligne continue selon la nature de celle-ci et son état thermique. Il est donc possible de prédire l'évolution du profil de température de la bande le long de cette section et d'ajuster en conséquence tes paramètres de fonctionnement de chaque unité de la section de refroidissement.The program (s) installed in the computer A are established with mathematical means exploiting models based on your physical laws of thermal exchanges, and allow a good simulation of the temperature variations of a band 2 during its passage in a section of a continuous line according to the nature of the latter and its thermal state. It is therefore possible to predict the evolution of the temperature profile of the strip along this section and adjust accordingly the operating parameters of each unit of the cooling section.
Des essais réalisés lors de ia mise en service de la ligne continue sont également mis à profit pour caler le modèie thermique et augmenter la précision du dispositif en améliorant le programme installé dans le calculateur. Tests carried out during the commissioning of the continuous line are also used to calibrate the thermal model and increase the accuracy of the device by improving the program installed in the computer.

Claims

REVENDICATIONS
1. Procédé de refroidissement d'une bande métallique (2) en défilement, dans une ligne de traitement en continu, par projection sur la bande d'un gaz, d'un liquide ou d'un mélange constitué d'un gaz et d'un liquide, la ligne de traitement comprenant une section de refroidissement (1) suivie d'une section aval (4) ayant un effet thermique sur la bande, l'entrée (4a) de la section aval correspondant à la sortie (1 b) de la section de refroidissement , caractérisé en ce que :Method for cooling a moving metal strip (2) in a continuous treatment line by spraying a gas, a liquid or a mixture of a gas and a gas onto the strip a liquid, the treatment line comprising a cooling section (1) followed by a downstream section (4) having a thermal effect on the strip, the inlet (4a) of the downstream section corresponding to the outlet (1b ) of the cooling section, characterized in that:
- le changement du profil transversal de température de la bande entre î'entrée (4a) et la sortie (4b) de la section aval (4), est déterminé en temps réel au moyen d'un calculateur (A) à partir de modèles mathématiques prenant en compte le format de la bande, la vitesse de défilement de la bande, le profil transversal de température (P4a) de la bande à l'entrée de la section aval et l'évolution des échanges thermiques entre la bande et son environnement dans la section avalthe change in the transverse temperature profile of the band between the inlet (4a) and the outlet (4b) of the downstream section (4) is determined in real time by means of a calculator (A) from models mathematics taking into account the format of the band, the running speed of the band, the transverse temperature profile (P4a) of the band at the inlet of the downstream section and the evolution of the thermal exchanges between the band and its environment in the downstream section
(4),(4)
- à partir d'un profil transversal de température (P4b) souhaité en sortie de la section aval (4), le profil transversal de température (P4a) à l'entrée de la section aval est adapté pour l'obtention du profil souhaité en sortie,from a desired transverse temperature profile (P4b) at the outlet of the downstream section (4), the transverse temperature profile (P4a) at the inlet of the downstream section is adapted to obtain the desired profile in exit,
- la capacité de refroidissement de la section de refroidissement (1) est régulée suivant la largeur de la bande et sur la longueur de la section de refroidissement en temps réel par un système de contrôle et de commande de la ligne au moyen du calculateur (A) à partir de modèles mathématiques prenant en compte le profil de température transversal de la bande (P 1a) à l'entrée de la section de refroidissement et révolution des échanges thermiques entre la bande et son environnement dans la section de refroidissement (1 ), de telle sorte que le refroidissement permette d'obtenir, en sortie de la section de refroidissement, le susdit profil transversal de température adapté (P4a).the cooling capacity of the cooling section (1) is regulated according to the width of the strip and the length of the cooling section in real time by a system for controlling and controlling the line by means of the computer (A ) from mathematical models taking into account the transverse temperature profile of the band (P 1a) at the inlet of the cooling section and revolution of heat exchange between the band and its environment in the cooling section (1), such that the cooling allows to obtain, at the outlet of the cooling section, the aforesaid transverse profile of adapted temperature (P4a).
2. Procédé selon la revendication 1 , caractérisé en ce que l'ajustement de la capacité de refroidissement est obtenu par un fractionnement d'un dispositif de refroidissement (R) en une pluralité d'unités (Ryz) dans le sens de la largeur et dans le sens de la longueur de la section de refroidissement (1).Method according to claim 1, characterized in that the adjustment of the cooling capacity is obtained by splitting a cooling device (R) into a plurality of units (Ryz) in the width direction and in the direction of the length of the section of cooling (1).
3. Procédé selon la revendication 2, caractérisé en ce que chaque unité (Ryz) est munie d'organes de régulation (7) pour faire varier sa capacité de refroidissement indépendamment des autres unités.3. Method according to claim 2, characterized in that each unit (Ryz) is provided with regulating members (7) to vary its cooling capacity independently of other units.
4. Procédé selon ia revendication 3, caractérisé en ce que la commande des organes de régulation (7) est assurée à partir du calculateur (A) dans lequel est installé un programme approprié de commande des unités de refroidissement.4. Method according to claim 3, characterized in that the control of the regulating members (7) is provided from the computer (A) in which is installed a suitable program for controlling the cooling units.
5. Procédé selon Ia revendication 4, caractérisé en ce que le calculateur (A) reçoit des informations fournies par des capteurs de température (8) répartis dans la section de refroidissement (1) et par des capteurs de température (9) répartis dans la section aval, et Ie calculateur (A)1 à partir de ces informations, vérifie si le refroidissement s'effectue de la manière souhaitée, et éventuellement corrige le déroulement du refroidissement, selon la largeur de la bande et suivant sa longueur pour obtenir ie profil souhaité. 5. Method according to claim 4, characterized in that the computer (A) receives information provided by temperature sensors (8) distributed in the cooling section (1) and by temperature sensors (9) distributed in the downstream section, and the computer (A) 1 from this information, checks whether the cooling is carried out in the desired manner, and possibly corrects the progress of the cooling, according to the width of the strip and along its length to obtain the profile wish.
EP10702914A 2009-01-09 2010-01-07 Method for cooling a moving metal belt Withdrawn EP2376664A1 (en)

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FR0900078A FR2940979B1 (en) 2009-01-09 2009-01-09 METHOD FOR COOLING A THREADED METAL STRIP
PCT/IB2010/050039 WO2010079445A1 (en) 2009-01-09 2010-01-07 Method for cooling a moving metal belt

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FR2940979B1 (en) 2011-02-11
US20110266725A1 (en) 2011-11-03

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