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EP3713685B1 - Cooling bar and cooling process with variable cooling rate for steel sheets - Google Patents

Cooling bar and cooling process with variable cooling rate for steel sheets Download PDF

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Publication number
EP3713685B1
EP3713685B1 EP18796035.6A EP18796035A EP3713685B1 EP 3713685 B1 EP3713685 B1 EP 3713685B1 EP 18796035 A EP18796035 A EP 18796035A EP 3713685 B1 EP3713685 B1 EP 3713685B1
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EP
European Patent Office
Prior art keywords
cooling
full
nozzles
cone
cooling rate
Prior art date
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Application number
EP18796035.6A
Other languages
German (de)
French (fr)
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EP3713685A1 (en
Inventor
Frederik Grosse Lordemann
Dirk Schmidt
Roman Dehmel
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP3713685A1 publication Critical patent/EP3713685A1/en
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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
    • 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
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • 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
    • 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
    • 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
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B21B2261/21—Temperature profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/22—Hardness
    • 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
    • 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

Definitions

  • the present invention relates to a cooling device with a variable cooling rate in heavy plate rolling mills, hot strip mills or heat treatment lines for the treatment of metallic materials.
  • a generic cooling device is, for example, from WO 2015/113832 A1 known.
  • the invention also relates to a cooling process with such a cooling device.
  • the final quality of rolled sheets is largely determined by the first forming steps and appropriate cooling. Defects that already occurred in the early stages of sheet metal production can only be remedied with difficulty or not at all in the subsequent lines and thus have a serious negative impact on the quality of the end product.
  • the temperature deformation path that the rolling stock goes through has a decisive influence on the mechanical properties of the rolling stock at the end of the rolling process. This means that the mechanical properties of the rolling intermediate product or end product are dependent on the temperatures at which the rolling stock was rolled during the respective rolling pass.
  • thermomechanical rolling of rolling stock the rolling process takes place in such a way that the rolling stock is only rolled within certain permissible temperature windows. This means that rolling passes and targeted cooling phases must alternate.
  • Hardening and subsequent tempering of steel components in heat treatment lines is also common practice. This achieves that a desired Combination of strength and toughness of the material can be adjusted in a targeted manner.
  • this technology is also used in the production of high-strength steel sheets in sheet metal systems, as is the case, for example, in the EP 1 764423 A1 is revealed.
  • the sheet is cooled in several reversing passes at high speed, for example down to room temperature, ie the hardening process is carried out.
  • the tempering process ie reheating of the strip to 600 ° C., for example, followed by renewed cooling. This allows sheets with different properties to be produced flexibly in small batches.
  • high and low cooling rates of the rolling stock can be set in a hot strip mill or in a heavy plate mill.
  • Cooling devices are known in which high cooling rates can be achieved with water nozzle cooling and low cooling rates using air fan cooling (forced convection).
  • the cooling device in order to achieve both a low and a very high cooling rate, taking into account maximum uniformity of the cooling transversely to the sheet metal running direction, it is proposed that the cooling device consists of at least two cooling bars, each transversely on both the underside and the top are arranged to the sheet running direction and centrally between two roller table rollers and comprises a spray nozzle cooling, each of which is assigned a plurality of full jet nozzles and a plurality of full cone nozzles, wherein the full jet nozzles are arranged symmetrically to the full cone nozzles.
  • cooling systems can advantageously be combined into one structural unit in one cooling beam.
  • the individual chilled beams can be made very compact and space-saving.
  • a retrofitting of an already existing rolling mill with sheet metal cooling can easily be carried out, since the cooling can be installed according to the invention between two roller tables without the need for any major adjustment work on the roller tables.
  • nozzle should not necessarily be limited to full jet or full cone nozzles.
  • Other types of spray nozzles or forms of application are also conceivable, such as hollow cone nozzles, flat jet nozzles, U-tubes, etc., which can also be combined in the cooling beams can be installed.
  • a cooling medium can be applied to the full jet nozzles in such a way that the sheet to be rolled can be cooled at a high cooling rate of 5 to 150 K / s, preferably 50 K / s. It is also provided that a cooling medium can be applied to the full cone nozzles in such a way that the sheet to be rolled can thereby be cooled at a low cooling rate of below 1 K / s to 19 K / s.
  • both the full cone nozzles and the full jet nozzles in the cooling beam can be acted upon and operated with the coolant at the same time or at different times and independently of one another.
  • the coolant quantity and the coolant surge pressure for each spray nozzle in the cooling beam are regulated individually and online.
  • the sheet to be rolled is cooled by spray cooling with a coolant, the cooling rate and / or the required final temperature being regulated by the amount of liquid and / or the number of full jet nozzles and cone nozzles (spray nozzles) that are switched on.
  • the sheet to be rolled is depending on the desired quality with a subsequently set cooling rate by means of a cooling medium that is passed into two cooling bars, which are each arranged both on the underside and on the top of the sheet and transversely to the sheet running direction and in the middle between at least two roller table rollers, and the cooling medium is cooled sprayed onto the sheet metal to be cooled via a multiplicity of full jet nozzles and full cone nozzles assigned to the cooling bars, the full jet nozzles being arranged symmetrically to the full cone nozzles in the cooling bars.
  • the coolant quantity and the coolant surge pressure for each spray nozzle (full jet nozzle and full cone nozzle) in the cooling beam should be individually regulated online.
  • at least one control parameter is measured for this purpose, wherein the control parameter can be the final temperature of the rolled sheet.
  • Process sensors provide information about the sheet temperature and the actual flatness; these are collected in front of and behind the cooling device and the actual values are compared with target values. From this value information, a model computer calculates online the type of cooling required for cooling, the cooling duration and the required amount of coolant depending on the desired material quality of the strip.
  • the determined control parameter (obtained / determined by the process sensors) can furthermore be combined with information about the dimensions and the material quality and / or with the target properties such as hardness and strength of the sheet to be rolled.
  • the device 10 consists essentially of two opposing cooling beams 16, 16a and 17, 17a arranged between two roller table rollers 12, 13, 14.
  • the cooling beams 16, 16a and 17, 17a are designed in a very compact design.
  • basically two cooling systems 16 and 17 as well as 17a and 17a have been combined to form a cooling unit 18 and 18a.
  • cooling units 18, 18a can be networked with one another and operated in a synchronized manner.
  • the cooling bars 16, 16a are assigned to the upper side of the sheet metal and the cooling bars 17, 17a are assigned to the lower side of the sheet metal.
  • FIG. 2 shows an enlarged illustration of the lower cooling bar 17 according to FIG. 1, the cooling bars 16, 16a and 17a being constructed in the same way.
  • the compact design is based on the fact that at least two types of nozzles, here full jet nozzles 19 and full cone nozzles 20 are arranged and integrated in a special way in the cooling beams 16, 16a and 17, 17a.
  • Nozzle cooling is installed, preferably with full jet nozzles 19, 19a for a high cooling rate and nozzle cooling, preferably with full cone nozzles 20 for low cooling rates (gentle cooling), via which a cooling medium 29 can be specifically released onto sheet metal 22.
  • the full cone nozzles 20 are in the middle and the full jet nozzles 19, 19a are spaced apart from this and are arranged parallel to the full cone nozzles 20 in the cooling beam 16, 16a and 17, 17a.
  • the nozzle cooling is preferably arranged in the cooling beam 16, 16a and 17, 17a transversely to the sheet running direction 20 and over the entire width of a sheet 22 to be rolled.
  • the Figure 3 is a graphic representation for controlling sheet metal cooling with the cooling system 16, 16a and 17, 17a according to the invention Fig. 2 .
  • advance information such as sheet metal primary data 23, target sheet metal properties 24 and actual sheet metal properties 25 can be made available to a cooling model 26 to regulate the cooling. These basic data are used to control the cooling device 28.
  • the cooling model 26 is regulated via the values detected by sensors 27, 27a.
  • the actual properties of the metal sheet 22 can be compared with the target properties after the cooling of the metal sheet 22 before cooling. If the target properties are not achieved, this information is transmitted to the cooling model and the cooling device is readjusted accordingly, as shown in Figure 4 is shown.
  • the cooling device can be used with maximum flexibility.
  • the manual interventions of the operating personnel are reduced to a minimum by the automatic control by the model computer.
  • the cooling model 26 interacts permanently and quasi online with the cooling device 28. A cooling model is therefore possible for each section of the machine. Volume flows and the actual data are also permanently compared and, if necessary, readjusted.
  • the control concept enables, for example, a heavy plate mill, a hot strip mill or a heat treatment line to be operated with maximum flexibility. This means that the desired cooling rate can be freely set at any time and over the entire length of the machine.
  • the model computer (not shown) controlling the cooling model 26 independently decides which cooling application (cooling rate) is necessary and most economical for the material properties to be achieved.

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

Description

Die vorliegende Erfindung betrifft eine Kühleinrichtung mit variabler Abkühlrate in Grobblechwalzwerken, Warmbandstraßen oder Wärmebehandlungslinien zur Behandlung von metallischen Werkstoffen. Eine gattungsgemässe Kühleinrichtung ist beispielsweise aus WO 2015/113832 A1 bekannt. Die Erfindung betrifft des Weiteren einen Kühlprozess mit einer derartigen Kühleinrichtung.The present invention relates to a cooling device with a variable cooling rate in heavy plate rolling mills, hot strip mills or heat treatment lines for the treatment of metallic materials. A generic cooling device is, for example, from WO 2015/113832 A1 known. The invention also relates to a cooling process with such a cooling device.

Die Endqualität von gewalzten Blechen wird maßgeblich durch die ersten Umformschritte und eine entsprechenden Kühlung bestimmt. Fehler, die bereits im Anfangsstadium der Herstellung des Bleches vorgekommen sind, können nur schwer oder gar nicht in den nachfolgenden Linien behoben werden und haben damit einen gravierenden negativen Einfluss auf die Qualität des Endproduktes. Beispielsweise nimmt beim Grobblechwalzen von Stahl der Temperatur-Umformungs-Weg, den das Walzgut durchläuft, maßgeblich Einfluss auf die am Ende des Walzprozesses vorliegenden mechanischen Eigenschaften des Walzguts. Dies bedeutet, die mechanischen Eigenschaften des Walzzwischenprodukts bzw. Endprodukts sind abhängig davon, bei welchen Temperaturen das Walzgut bei dem jeweiligen Walzstich gewalzt wurde.The final quality of rolled sheets is largely determined by the first forming steps and appropriate cooling. Defects that already occurred in the early stages of sheet metal production can only be remedied with difficulty or not at all in the subsequent lines and thus have a serious negative impact on the quality of the end product. For example, in the case of heavy-plate rolling of steel, the temperature deformation path that the rolling stock goes through has a decisive influence on the mechanical properties of the rolling stock at the end of the rolling process. This means that the mechanical properties of the rolling intermediate product or end product are dependent on the temperatures at which the rolling stock was rolled during the respective rolling pass.

Beim sogenannten thermomechanischen Walzen von Walzgut erfolgt der Walzprozess derart, dass das Walzgut nur in bestimmten zulässigen Temperaturfenstern gewalzt wird. Dies bedeutet, dass sich Walzstiche und gezielte Kühlphasen abwechseln müssen.In the so-called thermomechanical rolling of rolling stock, the rolling process takes place in such a way that the rolling stock is only rolled within certain permissible temperature windows. This means that rolling passes and targeted cooling phases must alternate.

Auch das Härten und anschließende Anlassen von Stahlbauteilen in Wärmebehandlungslinien ist gängige Praxis. Damit wird erreicht, dass eine gewünschte Kombination von Festigkeit und Zähigkeit des Werkstoffs gezielt eingestellt werden kann. Diese Technologie wird prinzipiell auch bei der Herstellung höherfester Stahlbleche in Blechanlagen eingesetzt, wie dies beispielsweise in der EP 1 764423 A1 offenbart ist. Hier wird nach dem Erwärmen der Bramme und dem Herunterwalzen auf die Enddicke auf dem Grobblechgerüst in mehreren Reversierstichen das Blech mit hoher Geschwindigkeit beispielsweise bis auf Raumtemperatur abgekühlt, d. h. es wird der Härtevorgang vollzogen. Im Anschluss daran folgt der Anlassprozess, d. h. die Wiedererwärmung des Bandes auf beispielsweise 600°C, woran sich ein erneutes Abkühlen anschließt. Damit können Bleche mit verschiedenen Eigenschaften flexibel in kleinen Losgrößen hergestellt werden.Hardening and subsequent tempering of steel components in heat treatment lines is also common practice. This achieves that a desired Combination of strength and toughness of the material can be adjusted in a targeted manner. In principle, this technology is also used in the production of high-strength steel sheets in sheet metal systems, as is the case, for example, in the EP 1 764423 A1 is revealed. Here, after the slab has been heated and rolled down to the final thickness on the heavy plate stand, the sheet is cooled in several reversing passes at high speed, for example down to room temperature, ie the hardening process is carried out. This is followed by the tempering process, ie reheating of the strip to 600 ° C., for example, followed by renewed cooling. This allows sheets with different properties to be produced flexibly in small batches.

Des Weiteren ist es wünschenswert, wenn sich hohe und niedrige Kühlraten des Walzgutes in einer Warmbandstraße oder in einem Grobblechwalzwerk einstellen lassen. Hierzu sind beispielsweise aus der EP 2 415 536 , EP 2 047 921 oder der JP 5 123 737 Kühleinrichtungen bekannt, bei denen sich hohe Kühlraten mit einer Wasser-Düsenkühlung und niedrige Kühlraten durch eine Luft-Ventilatorkühlung (Zwangskonvektion) realisieren lassen.Furthermore, it is desirable if high and low cooling rates of the rolling stock can be set in a hot strip mill or in a heavy plate mill. For this purpose, for example, from the EP 2 415 536 , EP 2 047 921 or the JP 5 123 737 Cooling devices are known in which high cooling rates can be achieved with water nozzle cooling and low cooling rates using air fan cooling (forced convection).

Bei herkömmlichen Düsenkühlungen wird ein Wasserstrahl zylindrisch auf das zu kühlende Walzgut geführt. Diese Art der Kühlung erzielt bereichsweise sehr gute Abkühlwerte. Es hat sich allerdings gezeigt, dass neben dem Kühlstrahl direkt benachbarte Bereiche unter Umständen nicht oder nicht in ausreichendem Maße gekühlt werden. Im Allgemeinen arbeitet eine derartige Wasserkühlung gut bei einem großen Wassermengendurchsatz der Kühldüsen. Bei vergleichsweise geringen Wassermengen werden allerdings nicht genug Düsen in ausreichendem Maße durchströmt. Die Abkühlung des Walzgutes erfolgt ungleichmäßig, es entstehen unweigerlich innere Spannungen, die in der Folge zu Unebenheiten im Material führen, was wiederum die Qualität des Endprodukts negativ beeinflusst. Eine Luftkühlung kann nur für Kühlungen mit Kühlraten bis ca. 1K/s bei mittleren Materialdicken eingesetzt werden. Für rissempfindliche Stahlgüten werden Kühlraten von 1 bis 2 K/s verlangt.With conventional nozzle cooling, a water jet is guided cylindrically onto the rolling stock to be cooled. This type of cooling achieves very good cooling values in certain areas. However, it has been shown that, in addition to the cooling jet, directly adjacent areas may not be cooled or not be cooled to a sufficient extent. In general, such a water cooling works well with a large amount of water throughput of the cooling nozzles. With comparatively small amounts of water, however, not enough nozzles are flowed through to a sufficient extent. The rolling stock cools down unevenly, internal stresses inevitably arise, which in turn lead to unevenness in the material, which in turn has a negative impact on the quality of the end product. Air cooling can only be used for cooling with cooling rates of up to approx. 1K / s for medium material thicknesses. For steel grades that are sensitive to cracks, cooling rates of 1 to 2 K / s are required.

Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Vorrichtung für eine Kühleinrichtung zu schaffen, mit der sowohl niedrigste als auch sehr hohe Kühlraten möglich sind und eine maximale Gleichmäßigkeit der Abkühlung quer zur Bandlaufrichtung erzeugt werden kann. Eine weitere Aufgabe besteht darin, ein Verfahren zum Betreiben der erfindungsgemäßen Vorrichtung anzugeben.It is therefore an object of the present invention to provide an apparatus for a To create a cooling device with which both the lowest and very high cooling rates are possible and a maximum uniformity of the cooling transversely to the strip running direction can be generated. Another object is to specify a method for operating the device according to the invention.

Diese Aufgabe wird durch eine Kühleinrichtung mit den Merkmalen des Anspruchs 1 sowie ein Verfahren mit den Merkmalen des Anspruchs 9 gelöst. Vorteilhafte Ausgestaltungen der vorliegenden Erfindung sind Gegenstand von Unteransprüchen.This object is achieved by a cooling device with the features of claim 1 and a method with the features of claim 9. Advantageous refinements of the present invention are the subject of subclaims.

Nach der Lehre der Erfindung wird zum Erzielen sowohl einer niedrigen als auch einer sehr hohen Abkühlrate unter Beachtung einer maximalen Gleichmäßigkeit der Abkühlung quer zur Blechlaufrichtung vorgeschlagen, dass die Kühleinrichtung aus mindestens zwei Kühlbalken besteht, die jeweils sowohl auf der Unterseite als auch auf der Oberseite quer zur Blechlaufrichtung und mittig zwischen zwei Rollgangsrollen angeordnet sind und eine Spritzdüsenkühlung umfasst, der jeweils eine Vielzahl von Vollstrahldüsen und eine Vielzahl Vollkegeldüsen zugeordnet sind, wobei die Vollstrahldüsen symmetrisch zu den Vollkegeldüsen angeordnet sind.According to the teaching of the invention, in order to achieve both a low and a very high cooling rate, taking into account maximum uniformity of the cooling transversely to the sheet metal running direction, it is proposed that the cooling device consists of at least two cooling bars, each transversely on both the underside and the top are arranged to the sheet running direction and centrally between two roller table rollers and comprises a spray nozzle cooling, each of which is assigned a plurality of full jet nozzles and a plurality of full cone nozzles, wherein the full jet nozzles are arranged symmetrically to the full cone nozzles.

Hierdurch können in vorteilhafter Weise zwei Kühlsysteme zu einer Baueinheit in einem Kühlbalken kombiniert werden. Dadurch kann der einzelne Kühlbalken sehr kompakt und platzsparend ausgebildet werden. Ein Nachrüsten einer bereits bestehenden Walzanlage mit einer Blechkühlung ist ohne Weiteres durchführbar, da die Kühlung erfindungsgemäß zwischen zwei Rollgängen installiert werden kann, ohne dass hierdurch an den Rollgängen wesentliche Anpassungsarbeiten nötig werden. Durch die symmetrische Anordnung der Vollstrahldüsen und der Vollkegeldüsen in den einzelnen Kühlbalken kann die Beaufschlagung der einzelnen Spritzdüsen mit einem Kühlmedium ebenfalls symmetrisch zwischen zwei Rollgangsrollen erfolgen.In this way, two cooling systems can advantageously be combined into one structural unit in one cooling beam. As a result, the individual chilled beams can be made very compact and space-saving. A retrofitting of an already existing rolling mill with sheet metal cooling can easily be carried out, since the cooling can be installed according to the invention between two roller tables without the need for any major adjustment work on the roller tables. Due to the symmetrical arrangement of the full jet nozzles and the full cone nozzles in the individual cooling bars, a cooling medium can also be applied to the individual spray nozzles symmetrically between two roller table rollers.

An dieser Stelle sei vermerkt, dass die Düsenart nicht notwendigerweise nur auf Vollstrahl- oder Vollkegeldüsen beschränkt sein soll. Denkbar sind auch andere Spritzdüsenarten bzw. Beaufschlagungsformen wie beispielsweise Hohlkegeldüsen, Flachstrahldüsen, U-Rohre usw., die auch in Kombinationen in die Kühlbalken eingebaut werden können.At this point it should be noted that the type of nozzle should not necessarily be limited to full jet or full cone nozzles. Other types of spray nozzles or forms of application are also conceivable, such as hollow cone nozzles, flat jet nozzles, U-tubes, etc., which can also be combined in the cooling beams can be installed.

Gemäß einer vorteilhaften Ausführungsform der Verwendung der erfindungsgemäßen Kühleinrichtung können die Vollstrahldüsen derart mit einem Kühlmedium beaufschlagt werden, sodass hierdurch das zu walzende Blech mit einer hohen Abkühlrate von 5 bis 150 K/s, vorzugsweise von 50 K/s, abgekühlt werden kann. Ferner ist vorgesehen, dass die Vollkegeldüsen derart mit einem Kühlmedium beaufschlagt werden können, sodass hierdurch das zu walzende Blech mit einer niedrigen Abkühlrate von unterhalb 1 K/s bis 19 K/s abkühlt werden kann.According to an advantageous embodiment of the use of the cooling device according to the invention, a cooling medium can be applied to the full jet nozzles in such a way that the sheet to be rolled can be cooled at a high cooling rate of 5 to 150 K / s, preferably 50 K / s. It is also provided that a cooling medium can be applied to the full cone nozzles in such a way that the sheet to be rolled can thereby be cooled at a low cooling rate of below 1 K / s to 19 K / s.

Des Weiteren kann innerhalb eines Kühlbalkens bedarfsorientiert und stufenlos zwischen einer hohen Abkühlrate mittels Vollstrahldüse und einer niedrigen Abkühlrate mittels Vollkegeldüse umgeschaltet werden, sodass hierdurch eine lückenlose Überlappung von Abkühlraten eingestellt werden kann.Furthermore, within a cooling bar, it is possible to switch continuously between a high cooling rate using a full jet nozzle and a low cooling rate using a full cone nozzle, as required, so that a seamless overlap of cooling rates can be set.

Dies hat den Vorteil, dass die Eigenschaften des zu walzenden Bleches auch über die Kühlung sehr genau eingestellt werden können. Für eine Umstellung sind sehr kleine Reaktionszeiten realisierbar, sodass bedarfsorientiert die vom Kunden gewünschten Materialeigenschaften schon beim Walzen über die gesteuerte Kühlung eingestellt bzw. voreingestellt werden können.This has the advantage that the properties of the sheet to be rolled can also be set very precisely via the cooling. Very short reaction times can be achieved for a changeover, so that the material properties required by the customer can be set or pre-set during rolling via the controlled cooling.

Um die Abkühlrate noch genauer und so sensibel wie möglich anpassen zu können, ist es vorgesehen, dass in dem Kühlbalken sowohl die Vollkegeldüsen als auch die Vollstrahldüsen zeitgleich oder zeitversetzt und unabhängig voneinander mit dem Kühlmittel beaufschlagt und betrieben werden können.In order to be able to adjust the cooling rate even more precisely and as sensitively as possible, it is provided that both the full cone nozzles and the full jet nozzles in the cooling beam can be acted upon and operated with the coolant at the same time or at different times and independently of one another.

Dabei ist es von Vorteil, wenn die Kühlmittelmenge und der Kühlmittelstoßdruck für jede Spritzdüse im Kühlbalken individuell und online geregelt werden. Hierzu ist es vorgesehen, dass die Abkühlung für das zu walzende Blech durch Spritzkühlung mit einem Kühlmittel erfolgt, wobei die Abkühlrate und/oder die jeweils erforderliche Endtemperatur durch die Flüssigkeitsmenge und/oder die Anzahl der jeweils eingeschalteten Vollstrahldüsen und Kegeldüsen (Spritzdüsen) geregelt wird.It is advantageous if the coolant quantity and the coolant surge pressure for each spray nozzle in the cooling beam are regulated individually and online. For this purpose, it is provided that the sheet to be rolled is cooled by spray cooling with a coolant, the cooling rate and / or the required final temperature being regulated by the amount of liquid and / or the number of full jet nozzles and cone nozzles (spray nozzles) that are switched on.

Verfahrensgemäß wird das zu walzende Blech in Abhängigkeit von der gewünschten Güte mit einer daraufhin eingestellten Abkühlrate, mittels eines Kühlmediums, das in zwei Kühlbalken geleitet wird, die jeweils sowohl auf der Unterseite als auch auf der Oberseite des Bleches und quer zur Blechlaufrichtung und mittig zwischen mindestens zwei Rollgangsrollen angeordnet sind, abgekühlt und das Kühlmedium wird dabei über eine den Kühlbalken zugeordnete Vielzahl von Vollstrahldüsen und Vollkegeldüsen auf das zu kühlende Blech aufgespritzt, wobei in den Kühlbalken die Vollstrahldüsen symmetrisch zu den Vollkegeldüsen angeordnet sind.According to the method, the sheet to be rolled is depending on the desired quality with a subsequently set cooling rate by means of a cooling medium that is passed into two cooling bars, which are each arranged both on the underside and on the top of the sheet and transversely to the sheet running direction and in the middle between at least two roller table rollers, and the cooling medium is cooled sprayed onto the sheet metal to be cooled via a multiplicity of full jet nozzles and full cone nozzles assigned to the cooling bars, the full jet nozzles being arranged symmetrically to the full cone nozzles in the cooling bars.

Ferner soll innerhalb eines Kühlbalkens bedarfsorientiert und stufenlos zwischen einer hohen Abkühlrate mittels Vollstrahldüse und einer niedrigen Abkühlrate mittels Vollkegeldüse umgeschaltet werden, um hierdurch eine lückenlose Überlappung von Abkühlraten einzustellen. Hierzu sollen die Kühlmittelmenge und der Kühlmittelstoßdruck für jede Spritzdüse (Vollstrahldüse und Vollkegeldüse) im Kühlbalken individuell online geregelt werden. Zur Regelung der Abkühlrate wird hierzu mindestens ein Regelparameter gemessen, wobei der Regelparameter die Endtemperatur des gewalzten Bleches sein kann.Furthermore, within a cooling bar, it should be switched between a high cooling rate by means of a full jet nozzle and a low cooling rate by means of a full cone nozzle, in order to set a gapless overlap of cooling rates. For this purpose, the coolant quantity and the coolant surge pressure for each spray nozzle (full jet nozzle and full cone nozzle) in the cooling beam should be individually regulated online. To regulate the cooling rate, at least one control parameter is measured for this purpose, wherein the control parameter can be the final temperature of the rolled sheet.

Prozesssensoren liefern Informationen über die Blechtemperatur und die Ist-Ebenheit; diese werden vor und hinter der Kühleinrichtung gesammelt und die Ist-Werte mit Soll-Werten verglichen. Aus diesen Werteinformationen berechnet ein Model-Computer online die für die Abkühlung erforderliche Kühlart, Kühldauer und die benötigte Kühlmittelmenge in Abhängigkeit von der gewünschten Materialgüte des Bandes.Process sensors provide information about the sheet temperature and the actual flatness; these are collected in front of and behind the cooling device and the actual values are compared with target values. From this value information, a model computer calculates online the type of cooling required for cooling, the cooling duration and the required amount of coolant depending on the desired material quality of the strip.

Der ermittelte Regelparameter (erhalten/ermittelt von den Prozesssensoren) kann des Weiteren mit Informationen über die Abmessung und die Materialgüte und/oder mit den Solleigenschaften wie Härte und Festigkeit des zu walzenden Bleches kombiniert werden.The determined control parameter (obtained / determined by the process sensors) can furthermore be combined with information about the dimensions and the material quality and / or with the target properties such as hardness and strength of the sheet to be rolled.

Die Erfindung wird im Folgenden anhand einer beispielhaften Ausführungsform unter Bezugnahme auf die beigefügten Zeichnungen näher erläutert. Die Figuren zeigen:

Fig. 1
die Seitenansicht auf die erfindungsgemäße Kühleinrichtung in einer schematischen Schnittdarstellung, wobei die Kühleinrichtung zwischen zwei Rollengängen einer Walzlinie angeordnet ist;
Fig. 2
die schematische Seitenansicht eines die Kühleinrichtung ausbildenden Kühlbalkens im Schnitt;
Fig. 3
die graphische Darstellung einer Kühleinrichtung, die als Grundlage zur Durchführung des erfindungsgemäßen Verfahrens dienen soll;
Fig. 4
eine graphische Detailansicht der Interaktion zwischen dem rechnergestützten Kühlmodel und der erfindungsgemäßen Kühleinrichtung in Fig. 3.
The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawings. The figures show:
Fig. 1
the side view of the cooling device according to the invention in a schematic sectional view, wherein the cooling device is arranged between two roller tables of a rolling line;
Fig. 2
the schematic side view of a cooling bar forming the cooling device in section;
Fig. 3
the graphic representation of a cooling device which is intended to serve as the basis for carrying out the method according to the invention;
Fig. 4
a graphical detailed view of the interaction between the computer-aided cooling model and the cooling device according to the invention in Fig. 3 .

Wie in der Fig. 1 dargestellt, besteht die Vorrichtung 10 im Wesentlichen aus zwei sich gegenüberliegenden, zwischen zwei Rollgangsrollen 12, 13, 14 angeordneten Kühlbalken 16, 16a und 17, 17a. Die Kühlbalken 16, 16a und 17, 17a sind in einer sehr kompakten Bauweise ausgeführt. Hierzu sind im Grunde genommen zwei Kühlsysteme 16 und 17 sowie 17a und 17a zu einer Kühleinheit 18 und 18a zusammengefasst worden.Like in the Fig. 1 shown, the device 10 consists essentially of two opposing cooling beams 16, 16a and 17, 17a arranged between two roller table rollers 12, 13, 14. The cooling beams 16, 16a and 17, 17a are designed in a very compact design. For this purpose, basically two cooling systems 16 and 17 as well as 17a and 17a have been combined to form a cooling unit 18 and 18a.

Es ist vorgesehen, dass die Kühleinheiten 18, 18a untereinander vernetzt und synchronisiert betrieben werden können. Die Kühlbalken 16, 16a sind dabei der Blechoberseite und die Kühlbalken 17, 17a der Blechunterseite zugeordnet.It is provided that the cooling units 18, 18a can be networked with one another and operated in a synchronized manner. The cooling bars 16, 16a are assigned to the upper side of the sheet metal and the cooling bars 17, 17a are assigned to the lower side of the sheet metal.

Figur 2 zeigt eine vergrößerte Darstellung des unteren Kühlbalkens 17 nach Figur 1, wobei die Kühlbalken 16, 16a und 17a in gleicher Weise aufgebaut sind. Figure 2 shows an enlarged illustration of the lower cooling bar 17 according to FIG. 1, the cooling bars 16, 16a and 17a being constructed in the same way.

Wie die Figuren 1 und 2 weiter zeigen, liegt die kompakte Bauweise darin begründet, dass mindestens zwei Düsenarten, hier Vollstrahldüsen 19 und Vollkegeldüsen 20 in besonderer Art und Weise in dem Kühlbalken 16, 16a und 17, 17a angeordnet und integriert sind. Es wird eine Düsenkühlung, vorzugsweise mit Vollstrahldüsen 19, 19a für eine hohe Abkühlrate und eine Düsenkühlung vorzugsweise mit Vollkegeldüsen 20 für niedrige Abkühlraten (sanfte Abkühlung) verbaut, über die ein Kühlmedium 29 auf das Blech 22 gezielt abgegeben werden kann.As the Figures 1 and 2 further show, the compact design is based on the fact that at least two types of nozzles, here full jet nozzles 19 and full cone nozzles 20 are arranged and integrated in a special way in the cooling beams 16, 16a and 17, 17a. Nozzle cooling is installed, preferably with full jet nozzles 19, 19a for a high cooling rate and nozzle cooling, preferably with full cone nozzles 20 for low cooling rates (gentle cooling), via which a cooling medium 29 can be specifically released onto sheet metal 22.

Die Vollkegeldüsen 20 sind dabei mittig und die Vollstrahldüsen 19, 19a sind hierzu beabstandet und parallel neben den Vollkegeldüsen 20 im Kühlbalken 16, 16a und 17, 17a angeordnet. Vorzugsweise ist die Düsenkühlung in dem Kühlbalken 16, 16a und 17, 17a quer zur Blechlaufrichtung 20 und über die gesamte Breite eines zu walzenden Bleches 22 angeordnet.The full cone nozzles 20 are in the middle and the full jet nozzles 19, 19a are spaced apart from this and are arranged parallel to the full cone nozzles 20 in the cooling beam 16, 16a and 17, 17a. The nozzle cooling is preferably arranged in the cooling beam 16, 16a and 17, 17a transversely to the sheet running direction 20 and over the entire width of a sheet 22 to be rolled.

Die Figur 3 ist eine graphische Darstellung zur Steuerung einer Blechkühlung mit dem erfindungsgemäßen Kühlsystem 16, 16a und 17, 17a nach Fig. 2. Grundsätzlich können zur Regelung der Kühlung Vorab-Informationen, wie Blech-Primärdaten 23, Soll-Blecheigenschaften 24 und Ist-Blecheigenschaften 25 einem Kühlmodel 26 zur Verfügung gestellt werden. Diese Grundlagendaten dienen der Steuerung der Kühleinrichtung 28. Geregelt wird das Kühlmodel 26 über die von Sensoren 27, 27a erfassten Werte. Dabei können die Ist-Eigenschaften des Bleches 22 vor der Kühlung mit den Soll-Eigenschaften nach der Kühlung des Bleches 22 abgeglichen werden. Werden die Soll-Eigenschaften nicht erreicht, werden diese Informationen dem Kühlmodel übermittelt und die Kühleinrichtung entsprechend nachgeregelt, wie dies in Figur 4 dargestellt ist.The Figure 3 is a graphic representation for controlling sheet metal cooling with the cooling system 16, 16a and 17, 17a according to the invention Fig. 2 . In principle, advance information such as sheet metal primary data 23, target sheet metal properties 24 and actual sheet metal properties 25 can be made available to a cooling model 26 to regulate the cooling. These basic data are used to control the cooling device 28. The cooling model 26 is regulated via the values detected by sensors 27, 27a. The actual properties of the metal sheet 22 can be compared with the target properties after the cooling of the metal sheet 22 before cooling. If the target properties are not achieved, this information is transmitted to the cooling model and the cooling device is readjusted accordingly, as shown in Figure 4 is shown.

Hierdurch ist ein sicherer und zuverlässiger Prozess gewährleistet. Die Kühleinrichtung kann mit einer maximalen Flexibilität eingesetzt werden. Die manuellen Eingriffe des Bedienpersonals werden durch die automatische Steuerung durch den Model-Computer auf ein Minimum reduziert.This ensures a safe and reliable process. The cooling device can be used with maximum flexibility. The manual interventions of the operating personnel are reduced to a minimum by the automatic control by the model computer.

Dabei interagiert das Kühlmodel 26 permanent und quasi online mit der Kühleinrichtung 28. Somit ist ein Kühlmodel für jeden Abschnitt der Maschine möglich. Dabei werden auch Volumenströme und die Ist-Daten permanent abgeglichen und ggf. nachgeregelt.The cooling model 26 interacts permanently and quasi online with the cooling device 28. A cooling model is therefore possible for each section of the machine. Volume flows and the actual data are also permanently compared and, if necessary, readjusted.

Dadurch ist es möglich, eine maximale Gleichmäßigkeit der Abkühlung quer und längs zur Bandlaufrichtung zu erzeugen, wobei Kühlraten von niedrigsten bis sehr hohen Werten realisiert werden können.This makes it possible to generate maximum uniformity of cooling across and along the direction of travel of the strip, with cooling rates from the lowest to very high values being able to be achieved.

Durch das Regelkonzept kann beispielsweise ein Grobblechwalzwerk, eine Warmbandstraße oder eine Wärmebehandlungslinie mit einer maximalen Flexibilität betrieben werden. Das bedeutet, dass die gewünschte Kühlrate zu jedem Zeitpunkt und über die gesamte Länge der Maschine frei eingestellt werden kann. Der das Kühlmodel 26 steuernde Modelcomputer (nicht dargestellt) entscheidet selbstständig, welche Kühlapplikation (Kühlrate) für die zu erzielenden Materialeigenschaften notwendig und am wirtschaftlichsten ist.The control concept enables, for example, a heavy plate mill, a hot strip mill or a heat treatment line to be operated with maximum flexibility. This means that the desired cooling rate can be freely set at any time and over the entire length of the machine. The model computer (not shown) controlling the cooling model 26 independently decides which cooling application (cooling rate) is necessary and most economical for the material properties to be achieved.

BezugszeichenlisteList of reference symbols

1010
Vorrichtungcontraption
1212th
RollgangsrolleRoller table roller
1313th
RollgangsrolleRoller table roller
1414th
RollgangsrolleRoller table roller
16, 16a16, 16a
Kühlbalken obenChilled beam above
17, 17a17, 17a
Kühlbalken untenChilled beam below
18, 18a18, 18a
KühlbalkenpaarPair of chilled beams
19, 19a19, 19a
VollstrahldüsenFull jet nozzles
2020th
VollkegeldüsenFull cone nozzles
2121
BlechlaufrichtungSheet direction
2222nd
Blechsheet
2323
Blech-PrimärdatenSheet metal primary data
2424
Soll-Blech-EigenschaftenTarget sheet metal properties
2525th
Ist-Blech-EigenschaftenActual sheet metal properties
2626th
KühlmodelCooling model
27, 27a27, 27a
SensorenSensors
2828
KühleinrichtungCooling device
2929
KühlmediumCooling medium

Claims (14)

  1. Cooling device (28) with variable cooling rate for the treatment of steel materials, particularly for the cooling of steel plates (22) in heavy plate rolling mills, hot rolling trains or thermal treatment lines, by means of spray nozzle cooling, comprising roller path rollers, wherein the cooling device consists of at least two cooling bars (16, 17, 16a, 17a), which are arranged not only at the lower side, but also at the upper side transversely to the plate running direction (21) of the plate (22) and centrally between two roller path rollers (12, 13, 14) and comprises spray nozzle cooling means, characterised in that a respective plurality of full-jet nozzles (19, 19a) and a respective plurality of full-cone nozzles (20) are associated with the spray nozzle cooling means, wherein the full-jet nozzles (19, 19a) are arranged symmetrically with respect to the full-cone nozzles (20).
  2. Use of a cooling device with variable cooling rate according to claim 1, characterised in that the full-jet nozzles (19, 19a) can be acted on by a cooling medium (29) in such a way that the plate (22) to be rolled can thereby be cooled at a high cooling rate of 5 to 150 K/s, preferably of 50 K/s.
  3. Use of a cooling device with variable cooling rate according to claim 1, characterised in that the full-cone nozzles (20) can be acted on by a cooling medium (29) in such a way that the strip (22) to be rolled can thereby be cooled at a low cooling rate of below 1 K/s to 19 K/s.
  4. Cooling device with variable cooling rate according to claim 1, characterised in that not only can full-jet nozzles and full-cone nozzles be combined, but any kind of known nozzles or forms of action such as flat-jet nozzles, hollow-cone nozzles and U-tubes are usable in the cooling bars (16, 17, 16a, 17a).
  5. Cooling device with variable cooling rate according to claim 1 or 4, characterised in that within a cooling bar (16, 16a, 17, 17a) there can be switching which is oriented in accordance with need and steplessly between a high cooling rate by means of full-jet nozzles (19, 19a) and a low cooling rate by means full-cone nozzle (20) so that a gapless overlap of cooling rates is thereby settable.
  6. Cooling device with variable cooling rate according to claim 5, characterised in that in the cooling bar (16, 16a, 17, 17a) not only the full-cone nozzles (20), but also the full-jet nozzles (19, 19a) can be acted on and operated at the same time or offset in time and independently of one another by a cooling medium (29).
  7. Cooling device with variable cooling rate according to claim 6, characterised in that the coolant quantity and the coolant impact pressure for each full-jet nozzle (19, 19a) and full-cone nozzle (20) in the cooling bar (16, 16a, 17, 17a) can be regulated individually and on-line.
  8. Cooling device with variable cooling rate according to claim 7, characterised in that the cooling is carried out for the plate (22), which is to be rolled, by spray cooling with the coolant (29), wherein the cooling rate and/or the respectively required final temperature can be regulated by the liquid quantity and/or the number of respectively switched-on full-jet nozzles (19, 19a) and full-cone nozzles (20) (spray nozzles).
  9. Method of operating the cooling device according to claim 1 or any one of claims 4 to 8, characterised in that the plate, which is to be rolled, is cooled in dependence on the desired quality with a cooling rate, which is set with respect thereto, by means of a cooling medium, which is conducted in two cooling bars which are arranged not only at the lower side, but also at the upper side of the plate and transversely to the plate running direction and centrally between at least two roller path rollers, and in that case a cooling medium is sprayed onto the plate, which is to be cooled, by way of a plurality, which is associated with the cooling bars, of full-jet nozzles and full-cone nozzles or flat-jet nozzles and hollow-cone nozzles 12 or U-tubes, wherein the full-jet nozzles or flat-jet nozzles are arranged in the cooling bars symmetrically with respect to the full-cone nozzles or the hollow-cone nozzles or the U-tubes.
  10. Method according to claim 9, characterised in that there is switching over within a cooling bar in orientation to need and steplessly between a high cooling rate by means of full-jet nozzles and a low cooling rate by means of full-cone nozzles or the full-jet nozzles and the full-cone nozzles are combined with one another and a gap free overlap of cooling rates is thereby set.
  11. Method according to claim 10, characterised in that the coolant quantity and the coolant impact pressure for each full-jet nozzle (19, 19a) and full-cone nozzle (20) are regulated in the cooling bar individually on-line.
  12. Method according to claim 11, characterised in that at least one regulating parameter is measured for regulation of the cooling rate, wherein the regulating parameter is the mechanical property such as hardness or microstructure parameter, such as phase distribution and grain size, in the plate.
  13. Method according to claim 12, characterised in that the regulating parameter is additionally combined with data about the dimensioning and material quality and/or with target characteristics such as hardness and strength of the strip to be rolled.
  14. Method according to claim 13, characterised in that process sensors collect information about the strip temperature and actual planarity before and behind the cooling device and the actual values are compared with target values so that a model computer calculates on-line from these value data the kind of cooling, cooling duration and coolant quantity, which are required for the cooling, in dependence on the desired material quality of the strip.
EP18796035.6A 2017-11-21 2018-10-31 Cooling bar and cooling process with variable cooling rate for steel sheets Active EP3713685B1 (en)

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DE102017127470.7A DE102017127470A1 (en) 2017-11-21 2017-11-21 Chilled beams and cooling process with variable cooling rate for steel sheets
PCT/EP2018/079856 WO2019101486A1 (en) 2017-11-21 2018-10-31 Cooling bar and cooling process with variable cooling rate for steel sheets

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EP3713685A1 (en) 2020-09-30
JP6960056B2 (en) 2021-11-05
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US20200360976A1 (en) 2020-11-19
DE102017127470A1 (en) 2019-05-23

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