EP1729900A1 - Device for cooling metal sheets and strips - Google Patents

Device for cooling metal sheets and strips

Info

Publication number
EP1729900A1
EP1729900A1 EP05707285A EP05707285A EP1729900A1 EP 1729900 A1 EP1729900 A1 EP 1729900A1 EP 05707285 A EP05707285 A EP 05707285A EP 05707285 A EP05707285 A EP 05707285A EP 1729900 A1 EP1729900 A1 EP 1729900A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
cooling medium
housing
gap
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05707285A
Other languages
German (de)
French (fr)
Other versions
EP1729900B1 (en
Inventor
Hans-Jürgen Bender
Markus Cramer
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1729900A1 publication Critical patent/EP1729900A1/en
Application granted granted Critical
Publication of EP1729900B1 publication Critical patent/EP1729900B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it
    • 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

Definitions

  • the invention relates to a device for cooling sheets and strips during their production, in particular after their rolling, which has a supply line for supplying a cooling medium, in particular water, which is connected to a housing, with two being displaceable relative to one another in the housing arranged nozzle rails are present, which can be arranged at a clear distance and thereby form a nozzle gap with a rectangular cross section for the cooling medium.
  • Spray bars with staggered nozzles are known for cooling sheets and strips during their manufacture, with which it is possible to spray a defined water flow in a certain geometric shape onto the rolling stock. Both the amount of water per time and the type of water jet are decisive for the desired cooling effect. Depending on the application, full jet, flat jet or cone jet nozzles are used.
  • Spray bars are sometimes configured with a large number (up to several hundred) of individual nozzles to form a cooling system, which form a cooling section in a sheet metal production system.
  • Another disadvantage here is that known nozzles of the type mentioned can easily become blocked and it is very expensive to uncover them again.
  • DE 36 34 188 C2 describes a cooling device for flat rolling stock, in which the cooling takes place by means of a water curtain with a laminar flow.
  • a specially designed slot nozzle is provided, which consists of two L-shaped elements that can be moved relative to one another.
  • DE 32 15 248 A1 discloses a device for generating a closed water curtain for cooling strips and sheets.
  • a cooling device for sheets and strips of the type mentioned is described in JP 57 10 37 28. Cooling water is supplied to the housing of the cooling device by means of a supply line.
  • the housing accommodates two nozzle rails which are displaceable relative to one another and can be positioned at a predetermined distance. This creates a nozzle gap with a rectangular cross section through which the water is applied under pressure and directed to the rolling stock to be cooled.
  • the setting of the The status of the nozzle rails and thus the width of the nozzle gap is achieved by an electric motor.
  • the invention is therefore based on the object of developing a device for cooling sheets and strips of the type mentioned at the outset in such a way that the disadvantages mentioned are avoided, i. H. that an absolutely uniform loading of the sheet or strip with cooling medium is ensured.
  • the solution to this problem by the invention is characterized in that in a device for cooling sheet metal and strips, at least one element is arranged between the point of entry of the cooling medium into the housing and the nozzle gap, which element forms a barrier for the cooling medium.
  • the element is preferably designed as a baffle plate, which deflects the flow of the cooling medium in the interior of the housing.
  • the element can be designed as a flat plate that extends parallel to the nozzle rails.
  • the length of the element preferably corresponds essentially to the length of the nozzle rails - viewed in the direction transverse to the conveying direction of the sheet or strip.
  • a preferred embodiment of the invention provides that the cooling medium is divided into two symmetrical flows at the point of entry into the housing, each of which is supplied in two channels to one nozzle rail, at least one barrier element being arranged between the channel and the nozzle rail or in the channel , It is particularly preferably provided that the element and a side of the nozzle rail facing away from the nozzle gap form a gap with a rectangular cross section for the cooling medium.
  • the cooling medium is advantageously conducted from the gap to the nozzle gap, both flows of the cooling medium reuniting at the point of entry at the nozzle gap.
  • the channels have an arcuate, in particular circular, profile in cross section.
  • An alternative embodiment of the invention provides that the cooling medium at the entry point is divided into two symmetrical flows which are fed to the nozzle gap in two channels, a single element being arranged in such a way that it narrows the cross section of both channels.
  • the element is preferably designed as a plate which is arranged between two housing walls in such a way that there are two passage gaps with a defined width.
  • the proposed device is characterized by a simple construction that can be implemented in a cost-effective manner.
  • the proposed nozzle system can be easily cleaned, which results in high availability and operational reliability.
  • Fig. 1 is a sectional view of a device for cooling a sheet or strip in side view
  • Fig. 2 shows an alternative to Fig. 1 embodiment.
  • a device 1 for cooling sheets or strips is sketched during their manufacture.
  • a sheet or strip 16 is moved in the conveying direction R under the device 1 at a constant speed.
  • cooling medium in the form of water must be sprayed onto the surface of the sheet 16 in a defined manner, which is accomplished by the device 1.
  • FIG. 1 shows a sectional illustration of the arrangement, the structure outlined extending over a certain width perpendicular to the plane of the drawing and the width of the device 1 being at least as large as the width of the sheet 16 to be cooled.
  • the device 1 has a housing 3 to which a feed line 2 for water is connected.
  • the water is conveyed within the housing 3 from the entry point 7 of the water at the location of the feed line 2 to a nozzle gap 6, which is formed by two nozzle rails 4 and 5 arranged at a distance a from one another.
  • the two nozzle rails 4, 5 have an L-shaped contour and - which is not shown in detail - can be moved relative to one another in or against the conveying direction R such that the desired clear distance a between the two legs 17 and 18 of the nozzle rails 4, 5 results. This defines the nozzle gap, by means of which it is possible to spray cooling medium onto the sheet 16 in the form of a water curtain.
  • an element 8 is arranged within the housing 3 in the region of the flow path of the water between the entry point 7 and the nozzle gap 6, which provides a barrier for represents the water.
  • the element 8 is designed as a baffle plate which has the sketched rectangular contour and extends across the width of the device 1 perpendicular to the plane of the drawing.
  • the water divides into two symmetrical streams 9 'and 9 ", that in two circular-arcuate channels 10' and 10" into the region of the opposite sides 11 'and 11 "of the legs 17 and 18 of the nozzle rails 4 or 5.
  • the baffle plate 8 is arranged there. net, which forms a barrier to the water so that it is deflected according to the arrows shown in Fig. 1.
  • the water is led through a gap 12 'or 12 "which is rectangular in cross-section and which results between the opposite sides 11' or 11” and the baffle plate 8 'or 8 ".
  • the water is redirected again and directed to the entry point 13 of the nozzle gap 6.
  • the two streams 9 'and 9 "of the water combine again and emerge together through the nozzle gap 6.
  • the cooling device sketched in FIG. 1 is particularly well suited for guiding water onto the sheet 16 from above.
  • a cooling device such as that outlined in FIG. 2 is preferably, but not exclusively, used.
  • the sheet 16 is also conveyed in the conveying direction R by means of guide rollers 19, with water being applied to it from below by means of the device 1.
  • the basic structure of the device corresponds to that according to FIG. 1.
  • the water reaches the housing 3 at the entry point 7 from the feed line 1.
  • the two nozzle rails 4, 5 are again L-shaped here
  • the distance a is formed between the two legs 17, 18 of the nozzle rails 4, 5 and defines the width of the nozzle gap 6.
  • the water in turn branches into two symmetrical streams 9 'and 9 ", which are conducted via respective channels 10', 10" within the housing 3 to the nozzle gap 6.
  • the element 8 is designed as a single flat plate, which is introduced into the region of the channels 10 ', 10 "in such a way that two housing walls 14' and 14" form passage gaps 15 'and 15 ", respectively each have a width b. After passing through the passage gaps 15 'and 15 ", the two water flows 9' and 9" unite at the entry point 13 into the nozzle gap 6 and pass through it together.
  • the proposed design results in an absolutely uniform application of cooling water to the sheet 16 and thus the possibility of precisely adjusting the technological boundary conditions to achieve the desired material properties and thus increasing the quality of the strip or sheet to be produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Secondary Cells (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

Disclosed is a device (1) for cooling metal sheets and strips during the production thereof, particularly following rolling thereof. Said device (1) comprises a feeding duct (2) for delivering a cooling medium, especially water. Said feeding duct (2) is connected to a housing (3) inside which two nozzle rails (4, 5) are disposed so as to be movable relative to one another. Said two nozzle rails (4, 5) can be arranged at a short distance (a) from each other, thereby forming a nozzle gap (6) for the cooling medium, said nozzle gap (6) having a rectangular cross section. At least one element (8) that forms a barrier for the cooling medium is placed in the housing (3) between the point of entrance (7) of the cooling medium into the housing (3) and the nozzle gap (6).

Description

Vorrichtung zum Kühlen von Blechen und BändernDevice for cooling sheets and strips
Die Erfindung betrifft eine Vorrichtung zum Kühlen von Blechen und Bändern bei deren Herstellung, insbesondere nach deren Walzen, die eine Zuführleitung zum Zuführen eines Kühlmediums, insbesondere von Wasser, aufweist, die mit einem Gehäuse verbunden ist, wobei im Gehäuse zwei relativ zueinander ver- schiebbar angeordnete Düsenschienen vorhanden sind, die in einem lichten Abstand angeordnet werden können und dabei einen im Querschnitt rechteck- förmigen Düsenspalt für das Kühlmedium bilden.The invention relates to a device for cooling sheets and strips during their production, in particular after their rolling, which has a supply line for supplying a cooling medium, in particular water, which is connected to a housing, with two being displaceable relative to one another in the housing arranged nozzle rails are present, which can be arranged at a clear distance and thereby form a nozzle gap with a rectangular cross section for the cooling medium.
Bei der Herstellung von Blechen und Bändern, insbesondere in Flachwalzwer- ken, ist es an verschiedenen Stellen erforderlich, das Blech bzw. das Band zu kühlen, um die Materialeigenschaften des Walzguts gezielt zu beeinflussen und ihm damit gewünschte Eigenschaften zu verleihen. Im Stand der Technik sind hierzu diverse Kühlvorrichtungen bekannt.In the manufacture of sheets and strips, particularly in flat rolling mills, it is necessary to cool the sheet or strip at various points in order to influence the material properties of the rolled stock in a targeted manner and thus to impart desired properties to it. Various cooling devices are known for this in the prior art.
Zum Kühlen von Blechen und Bändern bei deren Herstellung sind Spritzbalken mit versetzt angeordneten Düsen bekannt, mit denen es möglich ist, einen definierten Wasserstrom in bestimmter geometrischer Form auf das Walzgut aufzuspritzen. Sowohl die Wassermenge pro Zeit als auch die Art des Wasserstrahls sind dabei entscheidend für die gewünschte Kühlwirkung. Je nach Anwendung kommen Vollstrahl-, Flachstrahl- oder Kegelstrahldüsen zum Einsatz.Spray bars with staggered nozzles are known for cooling sheets and strips during their manufacture, with which it is possible to spray a defined water flow in a certain geometric shape onto the rolling stock. Both the amount of water per time and the type of water jet are decisive for the desired cooling effect. Depending on the application, full jet, flat jet or cone jet nozzles are used.
Mitunter werden Spritzbalken mit einer Vielzahl (bis zu mehreren hundert) einzelner Düsen zu einem Kühlsystem konfiguriert, die eine Kühlstrecke in einer Blechherstellanlage bilden.Spray bars are sometimes configured with a large number (up to several hundred) of individual nozzles to form a cooling system, which form a cooling section in a sheet metal production system.
BESTÄTIGUNΘSKOP.E Schwierigkeiten bereitet dabei die Auswahl eines geeigneten Düsentyps und die Festlegung der Düsenanordnung, die das Spritzbild definiert. Bei der Herstellung des Kühlsystems ist es oft recht aufwändig, die einzelnen Düsen zu platzieren und mittels Schraubelementen bzw. mittels Schweißungen oder Klebungen anzuordnen. Nachteilig ist hierbei ferner, dass bekannte Düsen der ge- nannten Art leicht verstopfen können und es einen hohen Aufwand darstellt, sie wieder freizulegen.BESTÄTIGUNΘSKOP.E Difficulties arise in selecting a suitable nozzle type and determining the nozzle arrangement that defines the spray pattern. When manufacturing the cooling system, it is often quite complex to place the individual nozzles and to arrange them by means of screw elements or by means of welds or bonds. Another disadvantage here is that known nozzles of the type mentioned can easily become blocked and it is very expensive to uncover them again.
In der DE 36 34 188 C2 wird eine Kühlvorrichtung für flaches Walzgut beschrieben, bei der das Kühlen mittels eines Wasservorhangs mit laminarer Strömung erfolgt. Um den Wasservorhang auf die Breite des zu kühlenden Gutes einzustellen, ist eine besonders ausgebildete Schlitzdüse vorgesehen, die aus zwei L-förmigen, relativ zueinander verschiebbaren Elementen besteht. Die DE 32 15 248 A1 offenbart eine Vorrichtung zur Erzeugung eines geschlossenen Wasservorhangs zur Kühlung von Bändern und Blechen. Um einen kohärenten Wasservorhang und eine große Benetzungsbreite bei großen Fallhöhen unter Verzicht auf verstell- bzw. verschwenkbare Wandteile der Düsen zu erhalten, ist hier vorgesehen, dass im Bereich des Düseneinlasses oder auf einem Teil der Fallhöhe der Wasserströmung durch gezielte Querschnittserweiterung ein Druckabfall und damit eine Herabsetzung der Ausströmgeschwindigkeit einge- stellt wird. Ähnliche Lösungen, die sich mit einer besonders effizienten Ausbildung von Spritzdüsen bzw. Spritzbalken beschäftigen, gehen aus der DE 33 34 251 C2, der JP 60 13 39 11 , der JP 80 39 126 und der JP 58 06 84 19 hervor.DE 36 34 188 C2 describes a cooling device for flat rolling stock, in which the cooling takes place by means of a water curtain with a laminar flow. In order to adjust the water curtain to the width of the material to be cooled, a specially designed slot nozzle is provided, which consists of two L-shaped elements that can be moved relative to one another. DE 32 15 248 A1 discloses a device for generating a closed water curtain for cooling strips and sheets. In order to obtain a coherent water curtain and a large wetting width with large drop heights without dispensing with adjustable or pivotable wall parts of the nozzles, it is provided here that in the area of the nozzle inlet or on part of the drop height of the water flow through a targeted cross-sectional expansion, a pressure drop and thus a Reduction of the outflow speed is set. Similar solutions, which deal with a particularly efficient design of spray nozzles or spray bars, can be found in DE 33 34 251 C2, JP 60 13 39 11, JP 80 39 126 and JP 58 06 84 19.
Eine Kühlvorrichtung für Bleche und Bänder der eingangs genannten Art ist in der JP 57 10 37 28 beschrieben. Dem Gehäuse der Kühlvorrichtung wird mittels einer Zuführleitung Kühlwasser zugeführt. Das Gehäuse nimmt zwei relativ zueinander verschiebbar angeordnete Düsenschienen auf, die in einem vorgegebenen Abstand positionierbar sind. Hierdurch wird ein im Querschnitt rechteck- förmiger Düsenspalt geschaffen, durch den das Wasser unter Druck ausge- bracht und auf das zu kühlende Walzgut geleitet wird. Die Einstellung des Ab- Standes der Düsenschienen und damit der Breite des Düsenspalts wird durch einen Elektromotor bewerkstelligt.A cooling device for sheets and strips of the type mentioned is described in JP 57 10 37 28. Cooling water is supplied to the housing of the cooling device by means of a supply line. The housing accommodates two nozzle rails which are displaceable relative to one another and can be positioned at a predetermined distance. This creates a nozzle gap with a rectangular cross section through which the water is applied under pressure and directed to the rolling stock to be cooled. The setting of the The status of the nozzle rails and thus the width of the nozzle gap is achieved by an electric motor.
Wenngleich mit einer Kühlvorrichtung dieser Art bereits ein gutes Arbeitsergebnis erzielt werden kann, hat es sich herausgestellt, dass die vorbekannte Aus- gestaltung eines Kühlsystems noch nicht optimal arbeitet, weil die gleichmäßige Wasserverteilung auf das Kühlgut mitunter Probleme bereitet. Das vorbekannte System ist bezüglich Druckschwankungen in der Kühlmedienzufuhr empfindlich, so dass nicht unter allen Betriebsbedingungen sichergestellt werden kann, dass ein optimales Spritzbild und damit bestmögliche Materialeigenschaften bei der Herstellung des Blechs bzw. des Bands gewährleistet sind.Although a good work result can already be achieved with a cooling device of this type, it has been found that the previously known design of a cooling system does not yet work optimally because the even water distribution on the goods to be cooled can sometimes cause problems. The previously known system is sensitive to pressure fluctuations in the cooling medium supply, so that it cannot be ensured under all operating conditions that an optimal spray pattern and thus the best possible material properties are guaranteed in the production of the sheet or strip.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zum Kühlen von Blechen und Bändern der eingangs genannten Art so fortzubilden, dass die genannten Nachteile vermieden werden, d. h. dass eine absolut gleichmäßige Beaufschlagung des Blechs bzw. des Bands mit Kühlmedium sichergestellt ist.The invention is therefore based on the object of developing a device for cooling sheets and strips of the type mentioned at the outset in such a way that the disadvantages mentioned are avoided, i. H. that an absolutely uniform loading of the sheet or strip with cooling medium is ensured.
Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass bei einer Vorrichtung zum Kühlen von Blechen und Bändern zwischen dem Eintrittspunkt des Kühlmediums in das Gehäuse und dem Düsenspalt min- destens ein Element angeordnet ist, das eine Barriere für das Kühlmedium bildet.The solution to this problem by the invention is characterized in that in a device for cooling sheet metal and strips, at least one element is arranged between the point of entry of the cooling medium into the housing and the nozzle gap, which element forms a barrier for the cooling medium.
Bevorzugt ist das Element als Prallblech ausgebildet, das den Fluss des Kühlmediums im Inneren des Gehäuses ablenkt. Das Element kann dabei als ebene Platte ausgebildet sein, die sich parallel zu den Düsenschienen erstreckt. Die Länge des Elements entspricht bevorzugt im wesentlichen der Länge der Düsenschienen - in Richtung quer zur Förderrichtung des Blechs oder Bands betrachtet. Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass das Kühlmedium am Eintrittspunkt in das Gehäuse in zwei symmetrische Ströme aufgeteilt wird, die in zwei Kanälen je einer Düsenschiene zugeführt werden, wobei zwischen Kanal und Düsenschiene bzw. im Kanal je mindestens ein Barriere-Element angeordnet ist. Dabei ist besonders bevorzugt vorgesehen, dass das Element und eine vom Düsenspalt abgewandte Seite der Düsenschiene einen im Querschnitt rechteckförmigen Spalt für das Kühlmedium bildet. Mit Vorteil wird das Kühlmedium vom Spalt zum Düsenspalt geleitet, wobei sich beide Ströme des Kühlmediums an der Eintrittsstelle am Düsenspalt wieder vereinigen. Schließlich kann bei dieser Ausgestaltung noch vorgesehen sein, dass die Kanäle im Querschnitt einen bogenförmigen, insbesondere kreisbogenförmigen, Verlauf aufweisen.The element is preferably designed as a baffle plate, which deflects the flow of the cooling medium in the interior of the housing. The element can be designed as a flat plate that extends parallel to the nozzle rails. The length of the element preferably corresponds essentially to the length of the nozzle rails - viewed in the direction transverse to the conveying direction of the sheet or strip. A preferred embodiment of the invention provides that the cooling medium is divided into two symmetrical flows at the point of entry into the housing, each of which is supplied in two channels to one nozzle rail, at least one barrier element being arranged between the channel and the nozzle rail or in the channel , It is particularly preferably provided that the element and a side of the nozzle rail facing away from the nozzle gap form a gap with a rectangular cross section for the cooling medium. The cooling medium is advantageously conducted from the gap to the nozzle gap, both flows of the cooling medium reuniting at the point of entry at the nozzle gap. Finally, it can also be provided in this embodiment that the channels have an arcuate, in particular circular, profile in cross section.
Eine alternative Ausgestaltung der Erfindung sieht vor, dass das Kühlmedium am Eintrittspunkt in zwei symmetrische Ströme aufgeteilt wird, die in zwei Kanä- len dem Düsenspalt zugeführt werden, wobei ein einziges Element so angeordnet ist, dass es den Querschnitt beider Kanäle verengt. Bevorzugt ist das Element als Platte ausgebildet, die so zwischen zwei Gehäusewandungen angeordnet ist, dass sich zwei Durchtrittsspalte mit definierter Breite ergeben.An alternative embodiment of the invention provides that the cooling medium at the entry point is divided into two symmetrical flows which are fed to the nozzle gap in two channels, a single element being arranged in such a way that it narrows the cross section of both channels. The element is preferably designed as a plate which is arranged between two housing walls in such a way that there are two passage gaps with a defined width.
Mit dem erfindungsgemäßen Vorschlag werden verschiedene Vorteile erzielt:Various advantages are achieved with the proposal according to the invention:
Zunächst ist es durch das Verschieben der beiden Düsenschienen, d. h. durch deren Einstellung auf einen gewünschten lichten Abstand in einfacher Weise möglich, die Schlitzdüsenbreite einzustellen und damit eine gewünschte Strahl- dicke zu erzielen. Der Strahl ist über die gesamte Band- bzw. Blechbreite konstant. Die Dicke des Kühlstrahls kann also in Folge der Einstellbarkeit auf die jeweiligen technologischen Erfordernisse leicht eingestellt werden. Durch die Bauart ist nicht zu befürchten, dass es zu Kühlstreifen kommt, d. h. zu Bereichen im Blech bzw. Band, die im Verhältnis zu anderen Bereichen unterschiedlich stark abgekühlt werden.First of all, by moving the two nozzle rails, ie by adjusting them to a desired clear distance, it is possible in a simple manner to set the slot nozzle width and thus to achieve a desired jet thickness. The beam is constant across the entire strip or sheet width. The thickness of the cooling jet can therefore be easily adjusted to the respective technological requirements due to the adjustability. Due to the design, there is no need to fear that there will be cooling strips, ie areas in the sheet or strip that are cooled to different extents than other areas.
Die vorgeschlagene Vorrichtung zeichnet sich durch eine einfache Konstruktion aus, die in kostengünstiger weise realisierbar ist.The proposed device is characterized by a simple construction that can be implemented in a cost-effective manner.
Besonders hervorzuheben ist eine absolut gleichmäßige Wasserbeaufschlagung des zu kühlenden Blechs bzw. Bands, wodurch eine maximale Homogenität der Materialstruktur im Blech bzw. Band erzielbar ist. Kühlstreifenbildung auf dem Blech bzw. Band ist damit ausgeschlossen.Particularly noteworthy is an absolutely uniform water application to the sheet or strip to be cooled, as a result of which a maximum homogeneity of the material structure in the sheet or strip can be achieved. This prevents the formation of cooling strips on the sheet metal or strip.
Im Falle einer Verunreinigung kann das vorgeschlagene Düsensystem leicht gereinigt werden, wodurch sich eine hohe Verfügbarkeit und Betriebssicherheit ergibt.In the event of contamination, the proposed nozzle system can be easily cleaned, which results in high availability and operational reliability.
In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt.Two exemplary embodiments of the invention are shown in the drawing.
Es zeigen:Show it:
Fig. 1 die Schnittdarstellung einer Vorrichtung zum Kühlen eines Blechs bzw. Bands in der Seitenansicht undFig. 1 is a sectional view of a device for cooling a sheet or strip in side view and
Fig. 2 eine zu Fig. 1 alternative Ausgestaltung.Fig. 2 shows an alternative to Fig. 1 embodiment.
In Fig. 1 ist eine Vorrichtung 1 zum Kühlen von Blechen bzw. Bändern bei deren Herstellung skizziert. Ein Blech bzw. Band 16 wird in Förderichtung R unter der Vorrichtung 1 mit konstanter Geschwindigkeit bewegt. Zur Erzielung gewünschter Materialeigenschaften muss Kühlmedium in Form von Wasser in definierter Weise auf die Oberfläche des Blechs 16 gespritzt werden, was durch die Vorrichtung 1 bewerkstelligt wird. Es sei angemerkt, dass die Darstellung gemäß Fig. 1 eine Schnittdarstellung der Anordnung zeigt, wobei sich die skizzierte Struktur über eine gewisse Breite senkrecht zur Zeichenebene erstreckt und die Breite der Vorrichtung 1 mindestens so groß wie die Breite des zu kühlenden Blechs 16 ist.In Fig. 1, a device 1 for cooling sheets or strips is sketched during their manufacture. A sheet or strip 16 is moved in the conveying direction R under the device 1 at a constant speed. To achieve the desired material properties, cooling medium in the form of water must be sprayed onto the surface of the sheet 16 in a defined manner, which is accomplished by the device 1. It should be noted that the illustration according to FIG. 1 shows a sectional illustration of the arrangement, the structure outlined extending over a certain width perpendicular to the plane of the drawing and the width of the device 1 being at least as large as the width of the sheet 16 to be cooled.
Um Kühlmedium in Form von Wasser in definierter Weise auf die Oberfläche des Blechs 16 spritzen zu können, weist die Vorrichtung 1 ein Gehäuse 3 auf, an das eine Zuführleitung 2 für Wasser angeschlossen ist. Das Wasser wird innerhalb des Gehäuses 3 vom Eintrittspunkt 7 des Wassers am Ort der Zuführ- leitung 2 zu einem Düsenspalt 6 gefördert, der durch zwei in einem Abstand a zueinander angeordneten Düsenschienen 4 und 5 gebildet wird. Die beiden Düsenschienen 4, 5 weisen im dargestellten Querschnitt eine L-förmige Kontur auf und können - was im Detail nicht dargestellt ist - relativ zueinander in bzw. entgegen Förderrichtung R so bewegt werden, dass sich der gewünschte lichte Abstand a zwischen den beiden Schenkeln 17 und 18 der Düsenschienen 4, 5 ergibt. Hierdurch wird der Düsenspalt definiert, mittels dem es möglich ist, Kühlmedium in Form eines Wasservorhangs auf das Blech 16 aufzuspritzen.In order to be able to spray cooling medium in the form of water onto the surface of the sheet 16 in a defined manner, the device 1 has a housing 3 to which a feed line 2 for water is connected. The water is conveyed within the housing 3 from the entry point 7 of the water at the location of the feed line 2 to a nozzle gap 6, which is formed by two nozzle rails 4 and 5 arranged at a distance a from one another. In the cross section shown, the two nozzle rails 4, 5 have an L-shaped contour and - which is not shown in detail - can be moved relative to one another in or against the conveying direction R such that the desired clear distance a between the two legs 17 and 18 of the nozzle rails 4, 5 results. This defines the nozzle gap, by means of which it is possible to spray cooling medium onto the sheet 16 in the form of a water curtain.
Um das Wasser aus dem Düsenspalt 6 in möglichst gleichmäßiger Weise aus- zubringen und damit Kühlstreifenbildung auf dem Blech 16 zu verhindern, ist innerhalb des Gehäuses 3 im Bereich des Fließweges des Wassers zwischen Eintrittspunkt 7 und Düsenspalt 6 ein Element 8 angeordnet, das eine Barriere für das Wasser darstellt. Das Element 8 ist im Ausführungsbeispiel gemäß Fig. 1 als Prallblech ausgebildet, das die skizzierte rechteckförmige Kontur hat und sich über die Breite der Vorrichtung 1 senkrecht zur Zeichenebene erstreckt.In order to discharge the water from the nozzle gap 6 as evenly as possible and thus prevent the formation of cooling stripes on the sheet 16, an element 8 is arranged within the housing 3 in the region of the flow path of the water between the entry point 7 and the nozzle gap 6, which provides a barrier for represents the water. In the exemplary embodiment according to FIG. 1, the element 8 is designed as a baffle plate which has the sketched rectangular contour and extends across the width of the device 1 perpendicular to the plane of the drawing.
Vom Eintrittspunkt 7 aus teilt sich das Wasser in zwei symmetrischen Ströme 9' und 9" auf, das in zwei kreisbogenförmig ausgebildeten Kanälen 10' und 10" in den Bereich der abgewandten Seiten 11' bzw. 11" der Schenkel 17 bzw. 18 der Düsenschienen 4 bzw. 5 gelangt. Dort allerdings ist das Prallblech 8 angeord- net, das eine Barriere für das Wasser bildet, so dass es gemäß den in Fig. 1 eingetragenen Pfeilen umgelenkt wird. Das Wasser wird durch einen im Querschnitt rechteckförmigen Spalt 12' bzw. 12" geführt, der sich zwischen den abgewandten Seiten 11 ' bzw. 11" und dem Prallblech 8' bzw. 8" ergibt. Im oberen Endbereich dieses Spalts 12' bzw. 12" wird das Wasser erneut umgelenkt und zur Eintrittsstelle 13 des Düsenspalts 6 geleitet. Hier vereinigen sich die beiden Ströme 9' und 9" des Wassers wiederum und treten gemeinsam durch den Düsenspalt 6 aus.From the entry point 7, the water divides into two symmetrical streams 9 'and 9 ", that in two circular-arcuate channels 10' and 10" into the region of the opposite sides 11 'and 11 "of the legs 17 and 18 of the nozzle rails 4 or 5. However, the baffle plate 8 is arranged there. net, which forms a barrier to the water so that it is deflected according to the arrows shown in Fig. 1. The water is led through a gap 12 'or 12 "which is rectangular in cross-section and which results between the opposite sides 11' or 11" and the baffle plate 8 'or 8 ". In the upper end region of this gap 12' or 12 "the water is redirected again and directed to the entry point 13 of the nozzle gap 6. Here the two streams 9 'and 9 "of the water combine again and emerge together through the nozzle gap 6.
Die in Fig. 1 skizzierte Kühlvorrichtung eignet sich besonders gut dafür, um von oben Wasser auf das Blech 16 zu leiten.The cooling device sketched in FIG. 1 is particularly well suited for guiding water onto the sheet 16 from above.
Soll das Blech 16 von unten gekühlt werden, kommt bevorzugt, jedoch nicht ausschließlich, eine Kühlvorrichtung zum Einsatz, wie sie in Fig. 2 skizziert ist.If the sheet 16 is to be cooled from below, a cooling device such as that outlined in FIG. 2 is preferably, but not exclusively, used.
Das Blech 16 wird auch hier in Förderrichtung R mittels Führungsrollen 19 gefördert, wobei es mittels der Vorrichtung 1 von unten mit Wasser beaufschlagt wird.The sheet 16 is also conveyed in the conveying direction R by means of guide rollers 19, with water being applied to it from below by means of the device 1.
Der prinzipielle Aufbau der Vorrichtung, die in Fig. 2 zu sehen ist, entspricht derjenigen gemäß Fig. 1. Das Wasser gelangt am Eintrittspunkt 7 von der Zuführleitung 1 in das Gehäuse 3. Die beiden Düsenschienen 4, 5 sind auch hier wieder L-förmig ausgebildet, wobei sich zwischen den beiden Schenkeln 17, 18 der Düsenschienen 4, 5 der Abstand a ausbildet und die Breite des Düsenspalts 6 definiert.The basic structure of the device, which can be seen in FIG. 2, corresponds to that according to FIG. 1. The water reaches the housing 3 at the entry point 7 from the feed line 1. The two nozzle rails 4, 5 are again L-shaped here The distance a is formed between the two legs 17, 18 of the nozzle rails 4, 5 and defines the width of the nozzle gap 6.
Am Eintrittspunkt 7 verzweigt sich das Wasser wiederum in zwei symmetrische Ströme 9' und 9", die über jeweilige Kanäle 10', 10" innerhalb des Gehäuses 3 zum Düsenspalt 6 geleitet werden. In diesem Falle ist das Element 8 als eine einzige ebene Platte ausgebildet, die so in den Bereich der Kanäle 10', 10" eingebracht ist, dass sich zu zwei Gehäusewandungen 14' bzw. 14" Durchtrittsspalte 15' bzw. 15" ausbilden, die jeweils eine Breite b aufweisen. Nach dem Passieren der Durchtrittsspalte 15' bzw. 15" vereinigen sich die beiden Wasserströme 9' und 9" an der Eintrittsstel- le 13 in den Düsenspalt 6 und treten durch diesen gemeinsam hindurch.At the entry point 7, the water in turn branches into two symmetrical streams 9 'and 9 ", which are conducted via respective channels 10', 10" within the housing 3 to the nozzle gap 6. In this case, the element 8 is designed as a single flat plate, which is introduced into the region of the channels 10 ', 10 "in such a way that two housing walls 14' and 14" form passage gaps 15 'and 15 ", respectively each have a width b. After passing through the passage gaps 15 'and 15 ", the two water flows 9' and 9" unite at the entry point 13 into the nozzle gap 6 and pass through it together.
Durch die vorgeschlagene Ausgestaltung ergibt sich eine absolut gleichmäßige Beaufschlagung des Blechs 16 mit Kühlwasser und damit die Möglichkeit, die technologischen Randbedingungen zur Erzielung gewünschter Materialeigen- schatten genau einzustellen und damit die Qualität des herzustellenden Bandes bzw. Bleches zu erhöhen. The proposed design results in an absolutely uniform application of cooling water to the sheet 16 and thus the possibility of precisely adjusting the technological boundary conditions to achieve the desired material properties and thus increasing the quality of the strip or sheet to be produced.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
1 Vorrichtung1 device
2 Zuführleitung2 feed line
3 Gehäuse3 housing
4 Düsenschiene4 nozzle rails
5 Düsenschiene5 nozzle rail
6 Düsenspalt6 nozzle gap
7 Eintrittspunkt des Kühlmediums7 Entry point of the cooling medium
8 Element8 element
8' Element8 'element
8" Element8 "element
9' Kühlmedien-Strom9 'Coolant flow
9" Kühlmedium-Strom9 "coolant flow
10' Kanal10 'channel
10" Kanal10 "channel
11' Seite der Düsenschiene11 'side of the nozzle rail
11" Seite der Düsenschiene11 "side of the nozzle rail
12' Spalt12 'gap
12" Spalt12 "gap
13 Eintrittsstelle am Düsenspalt13 Entry point at the nozzle gap
14' Gehäusewandung14 'housing wall
14" Gehäusewandung14 "housing wall
15' Durchtrittsspalt15 'passage gap
15" Durchtrittsspalt15 "passage gap
16 Blech, Band 17 Schenkel16 sheet, volume 17 legs
18 Schenkel18 legs
19 Führungsrolle19 Leadership role
a Abstand b Breitea distance b width
R Förderrichtung R direction of conveyance

Claims

Patentansprüche: claims:
1. Vorrichtung (1) zum Kühlen von Blechen und Bändern bei deren Herstellung, insbesondere nach deren Walzen, die eine Zuführleitung (2) zum Zuführen eines Kühlmediums, insbesondere von Wasser, aufweist, die mit einem Gehäuse (3) verbunden ist, wobei im Gehäuse (3) zwei relativ zueinander verschiebbar angeordnete Düsenschienen (4, 5) vorhanden sind, die in einem lichten Abstand (a) angeordnet werden können und dabei einen im Querschnitt rechteckförmigen Düsenspalt (6) für das Kühlmedium bilden, dadurch gekennzeichnet, dass im Gehäuse (3) zwischen dem Eintrittspunkt (7) des Kühlmediums in das Gehäuse (3) und dem Düsenspalt (6) mindestens ein Element (8) angeordnet ist, das eine Barriere für das Kühlmedium bildet.1. Device (1) for cooling sheets and strips in their manufacture, in particular after their rolling, which has a supply line (2) for supplying a cooling medium, in particular water, which is connected to a housing (3), in which Housing (3) there are two nozzle rails (4, 5) which are displaceable relative to one another and can be arranged at a clear distance (a) and thereby form a nozzle gap (6) with a rectangular cross section for the cooling medium, characterized in that in the housing (3) between the entry point (7) of the cooling medium into the housing (3) and the nozzle gap (6) at least one element (8) is arranged, which forms a barrier to the cooling medium.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Element (8) als Prallblech ausgebildet ist, das den Fluss des Kühlmediums im Inneren des Gehäuses (3) ablenkt.2. Device according to claim 1, characterized in that the element (8) is designed as a baffle plate that deflects the flow of the cooling medium in the interior of the housing (3).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Element (8) als ebene Platte ausgebildet ist, die sich parallel zu den Düsenschienen (4, 5) erstreckt.3. Device according to claim 1 or 2, characterized in that the element (8) is designed as a flat plate which extends parallel to the nozzle rails (4, 5).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Länge des Elements (8) im wesentlichen derjenigen der Düsenschienen (4, 5) entspricht.4. The device according to claim 3, characterized in that the length of the element (8) corresponds essentially to that of the nozzle rails (4, 5).
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Kühlmedium am Eintrittspunkt (7) in das Gehäuse (3) in zwei symmetrische Ströme (9', 9") aufgeteilt wird, die in zwei Kanälen (10', 10") je einer Düsenschiene (4, 5) zugeführt werden, wobei im Kanal (10', 10") in Strömungsrichtung vor der Düsenschiene (4, 5) je ein Element (8', 8") angeordnet ist.5. Device according to one of claims 1 to 4, characterized in that the cooling medium at the entry point (7) in the housing (3) is divided into two symmetrical flows (9 ', 9 "), which in two channels (10', 10 ") are fed to each nozzle rail (4, 5), an element (8 ', 8") being arranged in the channel (10', 10 ") in the flow direction in front of the nozzle rail (4, 5).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Element (8', 8") und eine vom Düsenspalt (6) abgewandte Seite (11', 11") der Düsenschiene (4, 5) einen im Querschnitt rechteckförmigen Spalt (12', 12") für das Kühlmedium bilden.6. The device according to claim 5, characterized in that the element (8 ', 8 ") and a side (11', 11") of the nozzle rail (4, 5) facing away from the nozzle gap (6) has a cross-sectionally rectangular gap (12 ', 12 ") form for the cooling medium.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das Kühlmedium vom Spalt (12', 12") zum Düsenspalt (6) geleitet wird, wobei sich beide Ströme (9', 9") des Kühlmediums an der Eintrittsstelle (13) am Düsenspalt (6) wieder vereinigen.7. The device according to claim 6, characterized in that the cooling medium is passed from the gap (12 ', 12 ") to the nozzle gap (6), with both flows (9', 9") of the cooling medium at the entry point (13) on Combine the nozzle gap (6) again.
8. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Kanäle (10', 10") zumindest abschnittsweise im Querschnitt einen bogenförmigen, insbesondere kreisbogenförmigen, Verlauf aufweisen.8. Device according to one of claims 5 to 7, characterized in that the channels (10 ', 10 ") at least in sections have an arcuate, in particular circular arc, cross-section.
9. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Kühlmedium am Eintrittspunkt (7) in das Gehäuse (3) in zwei symmetrische Ströme (9', 9") aufgeteilt wird, die in zwei Kanälen (10', 10") dem Düsenspalt (6) zugeführt werden, wobei ein einziges Element (8) so angeordnet ist, dass es den Querschnitt beide Kanäle (10', 10") verengt. Norrichtung nach Anspruch 9, dadurch gekennzeichnet, dass das Element (8) als Platte ausgebildet ist, die so zwischen zwei Gehäusewandungen (14', 14") angeordnet ist, dass sich zwei Durchtrittsspalte (15', 15") mit definierter Breite (b) ergeben. 9. Device according to one of claims 1 to 4, characterized in that that the cooling medium at the entry point (7) into the housing (3) is divided into two symmetrical flows (9 ', 9 "), which are supplied to the nozzle gap (6) in two channels (10', 10"), a single one The element (8) is arranged in such a way that it narrows the cross section of both channels (10 ', 10 "). The device according to claim 9, characterized in that the element (8) is designed as a plate, which is thus between two housing walls (14' , 14 ") is arranged so that there are two passage gaps (15 ', 15") with a defined width (b).
EP05707285A 2004-03-29 2005-02-09 Device for cooling metal sheets and strips Active EP1729900B1 (en)

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DE102004015741A DE102004015741A1 (en) 2004-03-29 2004-03-29 Device for cooling sheets and strips
PCT/EP2005/001296 WO2005105334A1 (en) 2004-03-29 2005-02-09 Device for cooling metal sheets and strips

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RU2006133645A (en) 2008-03-27

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