EP0383786B1 - Device for producing a water curtain - Google Patents

Device for producing a water curtain Download PDF

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Publication number
EP0383786B1
EP0383786B1 EP88908673A EP88908673A EP0383786B1 EP 0383786 B1 EP0383786 B1 EP 0383786B1 EP 88908673 A EP88908673 A EP 88908673A EP 88908673 A EP88908673 A EP 88908673A EP 0383786 B1 EP0383786 B1 EP 0383786B1
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EP
European Patent Office
Prior art keywords
water
water curtain
water tank
wide
curtain
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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.)
Expired - Lifetime
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EP88908673A
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German (de)
French (fr)
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EP0383786A1 (en
Inventor
Jürgen BOOS
Ingo Von Hagen
Christoph Prasser
Joachim RÖMER
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Vodafone GmbH
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Mannesmann AG
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Priority to AT88908673T priority Critical patent/ATE75639T1/en
Publication of EP0383786A1 publication Critical patent/EP0383786A1/en
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    • 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
    • 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
    • B05C5/005—Curtain coaters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching

Definitions

  • the invention relates to a device for generating a water curtain according to the preamble of patent claim 1.
  • Laminar water curtains are created in order to specifically cool the rolling stock. These can be strips, sheets, slabs as well as pipes. As a rule, cooling must take place evenly. For this reason, the goods to be cooled must be aligned with the water curtains.
  • Flat bodies are generally transported transversely to the water curtains and through them via roller conveyors, while rotationally symmetrical bodies are cooled under the water curtains, the axis of rotation being aligned parallel to the line of incidence of the water on the rolling stock and preferably being located vertically below it
  • a major difficulty in producing a laminar water curtain is to produce a uniform thickness over the entire width of the water curtain, ie to ensure the same water supply at all points in the impact zone on the rolling stock to be cooled. Due to the large required width (max. 5 m for flat rolled material, 15 - 30 m for pipes) of the water curtain, irregularities in the laminar flow in the form of constrictions can occur, which can even lead to the water curtain tearing at individual points.
  • DE-OS 33 34 251 it is known from DE-OS 33 34 251 to bend the side walls of the slit nozzle across the entire width of the water curtain in the area of the outlet opening in a convex manner transversely to the direction of flow of the cooling water, that is to say the outlet cross section from the sides to the center of the To enlarge slit nozzle.
  • a disadvantage of this solution is in particular that the width of the water curtain produced is always constant, that is to say it cannot be adapted to the width or length of the rolling stock to be cooled.
  • a disadvantage of this solution is that the formation of a laminar flow in the outlet nozzle is severely disrupted because the water in each water box is sprayed into the inlet zone of the wide slot nozzle through individually controllable round nozzles and leads to turbulence.
  • Another disadvantage is that, as studies have shown, the water supply is uneven in the confluence zone ("interface") of the parts of the water curtain emerging from two adjacent water boxes, that is to say in the zone lying vertically below the bulkheads.
  • the cross-section of the water curtain in these zones is approximately bone-shaped, so that in the rolling stock, seen across the width of the water curtain, there are both more and less intensive cooling than actually intended, and thus different microstructures occur.
  • the object of the invention is to develop a device according to the preamble of claim 1 to the extent that these disadvantages are avoided as far as possible.
  • the invention is based on dividing a water box device going over the required water curtain width into several mutually independent modules, i.e. into individual water boxes with their own water supply and their own water outlet opening, the individually produced water curtains of which in turn are to be combined to form a total water curtain.
  • the device according to the invention ensures a safe formation of the laminar flow in the outlet nozzle, since the water already reaches the entry zone of the slot slot guide in a calming manner through a siphon-like overflow that goes over the entire width of each individual water box. This largely eliminates the negative effects of turbulence when the water enters from the adjustable feed line into the water tank.
  • the invention avoids the "bone formation" in the impact zone of the water curtain on the rolling stock.
  • the confluence of adjacent sections of the water curtain compared to the normal width of the impact zone (thickness of the water curtain) results in a central area with too little water supply, on each side of which there is an area with a too large one Water supply connects.
  • This problem is solved according to the invention by providing a further targeted physical guidance of the water curtains in their marginal areas after flowing through the slot slot guide in order to equalize the flow and controlled "fusion" of the edges.
  • the individual water boxes are arranged at a distance from one another, so that the partition between two immediately adjacent water boxes is no longer designed as a common partition wall but as individual walls.
  • the water box arrangement according to the invention in FIG. 1 shows in longitudinal section a division into three spaced-apart water boxes 1, each of which is connected to a separately controllable water supply line 2.
  • this device is shown in cross section along the line A-A and in Figure 3 in cross section along the line B-B.
  • the water flows in laminar form through a wide slot guide 3 from the water tank 1 in free fall downwards.
  • the siphon-like overflow device contributes to this, which is formed by the sheets 10 and 11 which project vertically from the cover or the bottom of the water box 1 into the liquid level and extend over the entire width of the water box 1.
  • the sheet 11 forms together with the boundary wall 6, the slot guide 3, which has the same clear width over the entire width of the water tank 1.
  • the edges of the three sections of the water curtain produced by the outflowing water are brought together by the guide webs 1, each of which laterally adjoins the wall 5 delimiting the narrow side of the slot guides 3 downwards.
  • adjacent guide webs 4 are each inclined to one another and connected to one another at their ends to form a conical taper.
  • the side walls 6 of all water boxes 1, like the metal sheets 11, are extended below the water boxes 1 and guide the slot guides 3 into a common outlet nozzle 7 for all water boxes 1.
  • the exit plane of the outlet nozzle 7 is designated by the reference symbol 8 and lies clearly below the conical tapering formed by the guide webs 4, so that a zone for flow calming is created below this up to the exit plane 8.
  • the clear width of the outlet nozzle 7 has been reduced locally in each case by a sheet metal strip 9, which is fastened to the inside of the sheet 11, in order to ensure that the water supply in the interfaces is reached via the guide bars 4 Limit reduction beyond.
  • the results of hardness measurements on two steel tubes made of the material 29 CrMo 4 4 or 20 CrMo 4 4 treated according to the invention are shown graphically in FIG. 5 or FIG. 6 as a function of the distance of the measuring point from the interface of two sections of a water curtain.
  • the hardness values on the inner and outer surface and in the middle of the pipe wall were determined.
  • the course of these hardness values shows neither an increased nor a reduced cooling effect in the area of the interface.
  • the absolute level of the individual values and their fluctuation range correspond entirely to the course that can be achieved in the best case with planned cooling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Nozzles (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)

Abstract

In a device for producing a water curtain for cooling the roll feed material, a particular arrangement of the water boxes and a particular association of the corresponding sheet openings are proposed in order to obtain a uniform water curtain or a water discharge which varies from zone to zone.

Description

Die Erfindung betrifft eine Vorrichtung zur Erzeugung eines Wasservorhangs gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for generating a water curtain according to the preamble of patent claim 1.

Laminare Wasservorhänge werden erzeugt, um Walzgut gezielt abzukühlen. Hierbei kann es sich sowohl um Bänder, Bleche, Brammen als auch um Rohre handeln. Die Abkühlung muß in der Regel gleichmäßig erfolgen. Aus diesem Grunde muß das abzukühlende Gut in bezug zu den Wasservorhängen ausgerichtet sein. Flache Körper werden in der Regel quer zu den Wasservorhängen und durch diese hindurch über Rollgänge transportiert, während rotationssymmetrische Körper drehend unter den Wasservorhängen gekühlt werden, wobei die Drehachse parallel zur Auftrefflinie des Wassers auf dem Walzgut ausgerichtet ist und sich vorzugsweise senkrecht unter dieser befindetLaminar water curtains are created in order to specifically cool the rolling stock. These can be strips, sheets, slabs as well as pipes. As a rule, cooling must take place evenly. For this reason, the goods to be cooled must be aligned with the water curtains. Flat bodies are generally transported transversely to the water curtains and through them via roller conveyors, while rotationally symmetrical bodies are cooled under the water curtains, the axis of rotation being aligned parallel to the line of incidence of the water on the rolling stock and preferably being located vertically below it

Eine wesentliche Schwierigkeit bei der Erzeugung eines laminaren Wasservorhangs besteht darin, über die gesamte Breite des Wasservorhangs eine gleichmäßige Dicke zu erzeugen, d.h. an allen Stellen in der Auftreffzone auf dem zu kühlenden Walzgut das gleiche Wasserangebot sicherzustellen. Wegen der großen erforderlichen Breite (max. 5 m bei flachem Walzgut, 15 - 30 m bei Rohren) des Wasservorhangs kann es zu Unregelmäßigkeiten der laminaren Strömung in Form von Einschnürungen kommen, die sogar zum Zerreißen des Wasservorhangs an einzelnen Stellen führen können. Zur Vermeidung dieser negativen Erscheinungen ist es aus der DE-OS 33 34 251 bekannt, die Seitenwände der über die gesamte Breite des Wasservorhangs gehenden Schlitzdüse im Bereich der Auslaßöffnung quer zur Strömungsrichtung des Kühlwassers konvex zu krümmen, also den Austrittsquerschnitt von den Seiten zur Mitte der Schlitzdüse hin zu vergrößern. Nachteilig bei dieser Lösung ist insbesondere, daß die Breite des erzeugten Wasservorhangs stets konstant ist, also nicht an die Breite oder Länge des jeweils zu kühlenden Walzgutes anpaßbar ist.A major difficulty in producing a laminar water curtain is to produce a uniform thickness over the entire width of the water curtain, ie to ensure the same water supply at all points in the impact zone on the rolling stock to be cooled. Due to the large required width (max. 5 m for flat rolled material, 15 - 30 m for pipes) of the water curtain, irregularities in the laminar flow in the form of constrictions can occur, which can even lead to the water curtain tearing at individual points. To avoid these negative phenomena, it is known from DE-OS 33 34 251 to bend the side walls of the slit nozzle across the entire width of the water curtain in the area of the outlet opening in a convex manner transversely to the direction of flow of the cooling water, that is to say the outlet cross section from the sides to the center of the To enlarge slit nozzle. A disadvantage of this solution is in particular that the width of the water curtain produced is always constant, that is to say it cannot be adapted to the width or length of the rolling stock to be cooled.

Zur Lösung dieses Anpassungsproblems wurde in der Patentanmeldung DE 36 34 188 A1 vorgeschlagen, die Stirnwände (Schmalseiten) der Schlitzdüsen einzeln oder gegenläufig entlang den Seitenwänden (breitseiten) der Schlitzdüsen verschiebbar anzuordnen, so daß sich beliebige Düsenbreiten einstellen lassen. Dieser Vorschlag ist technisch vergleichsweise aufwendig und hat zudem den Nachteil, daß beim Anfahren des Wasservorhangs etwa die 2,5-fache Wassermenge pro Zeiteinheit zur Verfügung gestellt werden muß, als im Normalbetrieb für die gleiche Wasservorhangbreite benötigt wird. Ein entsprechend erhöhtes Wasserangebot ist für die Ausbildung einer laminaren Strömung stets erforderlich.To solve this adaptation problem, it was proposed in patent application DE 36 34 188 A1 to arrange the end walls (narrow sides) of the slot nozzles to be displaceable individually or in opposite directions along the side walls (broad sides) of the slot nozzles, so that any nozzle widths can be set. This proposal is technically comparatively complex and also has the disadvantage that when starting the water curtain about 2.5 times the amount of water per unit of time must be made available than is required in normal operation for the same water curtain width. A correspondingly increased water supply is always necessary for the formation of a laminar flow.

Weiterhin ist es aus der DE 35 23 829 A1 bekannt, das Wasserangebot in einzelnen Abschnitten des Wasservorhangs gezielt zu beeinflussen, indem die Wasserkasteneinrichtung durch eine Reihe von in Strömungsrichtung des Wassers verlaufenden Abschottungen praktisch in eine Vielzahl nebeneinander angeordnete Wasserkästen unterteilt wird, wobei jeder Wasserkasten eine eigene regelbare Zuleitung aufweist. Die dicht oberhalb der Austrittsebene der für alle Wasserkästen gemeinsamen Breitschlitzdüse endenden Abschottungen weisen an ihren unteren Enden konische Verjüngungen auf und werden durch einfache Trennbleche gebildet, die jeweils zwei unmittelbar benachbarten Wasserkästen gemeinsam zugeordnet sind, so daß diese Wasserkästen (abgesehen von der Blechdicke) ohne Abstand aneinanoergereiht sind.Furthermore, it is known from DE 35 23 829 A1 to specifically influence the water supply in individual sections of the water curtain by practically dividing the water box device into a plurality of water boxes arranged next to one another by a series of bulkheads running in the flow direction of the water, each water box having one has its own adjustable supply line. The partitions that end just above the exit level of the common slot nozzle common to all water boxes have conical tapering at their lower ends and are formed by simple separating plates, which are each assigned to two immediately adjacent water boxes, so that these water boxes (apart from the plate thickness) have no spacing are lined up.

Nachteilig bei dieser Lösung ist es, daß die Ausbildung einer laminaren Strömung in der Austrittsdüse stark gestört wird, weil das Wasser in jedem Wasserkasten durch einzelne regelbare Runddüsen in die Eintrittszone der breitschlitzdüse gespritzt wird und zu Verwirbelungen führt. Ein weiterer Nachteil ist, daß das Wasserangebot, wie Untersuchungen gezeigt haben, in der Zusammenfließzone ("Nahtstelle") der aus zwei benachbarten Wasserkästen austretenden Teilstücke des Wasservorhangs, also in der vertikal unterhalb der Abschottungen liegenden Zone ungleichmäßig ist.A disadvantage of this solution is that the formation of a laminar flow in the outlet nozzle is severely disrupted because the water in each water box is sprayed into the inlet zone of the wide slot nozzle through individually controllable round nozzles and leads to turbulence. Another disadvantage is that, as studies have shown, the water supply is uneven in the confluence zone ("interface") of the parts of the water curtain emerging from two adjacent water boxes, that is to say in the zone lying vertically below the bulkheads.

Im Querschnitt ist der Wasservorhang in diesen Zonen nämlich etwa knochenförmig ausgebildet, so daß es im Walzgut über die Breite des Wasservorhangs gesehen sowohl zu mehr als auch zu weniger intensiven Kühlungen als eigentlich beabsichtigt und somit zu unterschiedlichen Gefügeausbildungen kommt.The cross-section of the water curtain in these zones is approximately bone-shaped, so that in the rolling stock, seen across the width of the water curtain, there are both more and less intensive cooling than actually intended, and thus different microstructures occur.

Aufgabe der Erfindung ist es, eine Vorrichtung gemäß dem Oberbegriff des Patentanspruchs 1 dahingehend weiterzuentwickeln, daß diese Nachteile möglichst weitgehend vermieden werden.The object of the invention is to develop a device according to the preamble of claim 1 to the extent that these disadvantages are avoided as far as possible.

Gelöst wird diese Aufgabe erfindungsgemäß mit den kennzeichnenden Merkmalen des Patentanspruchs 1. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen 2 und 3 angegeben.This object is achieved according to the invention with the characterizing features of patent claim 1. Advantageous developments of the invention are specified in subclaims 2 and 3.

Die Erfindung geht davon aus, eine über die erforderliche Wasservorhangbreite gehende Wasserkasteneinrichtung in mehrere voneinander unabhängige Module, also in einzelne Wasserkästen mit eigener Wasserzuleitung und eigener Wasseraustrittsöffnung aufzuteilen, deren einzeln erzeugte Wasserteilvorhänge wiederum zu einem Gesamtwasservorhang zusammenzuführen sind.The invention is based on dividing a water box device going over the required water curtain width into several mutually independent modules, i.e. into individual water boxes with their own water supply and their own water outlet opening, the individually produced water curtains of which in turn are to be combined to form a total water curtain.

Hierdurch wird nicht nur eine Anpassung an unterschiedliche Walzgutbreiten oder -längen ermöglicht, indem einzelne Module durch Regelung der Wasserzuleitung abgeschaltet oder zugeschaltet werden. Es können selbstverständlich auch gewollt unterschiedliche Kühlintensitäten über die Walzgutbreite oder -länge durch entsprechende Regelung der Wasserzufuhr in den einzelnen Wasserkästen erreicht werden. Weiterhin ergibt sich beim Anfahren der Vorrichtung eine Möglichkeit zur Reduzierung des erforderlichen Wasserangebotes, indem die einzelnen Module nacheinander angefahren werden, so daß der erhöhte Wasserbedarf beim Anfahren zur Ausbildung der laminaren Strömung immer nur bei einem einzelnen Modul vorliegt.This not only enables adaptation to different rolling stock widths or lengths, in that individual modules are switched off or on by regulating the water supply line. Of course, it is also possible to achieve different cooling intensities over the width or length of the rolling stock by appropriately regulating the water supply in the individual water boxes. Furthermore, when starting up the device, there is a possibility of reducing the required water supply by starting up the individual modules one after the other, so that the increased water requirement when starting up to form the laminar flow is only ever present in a single module.

Darüberhinaus gewährleistet die erfindungsgemäße Vorrichtung eine sichere Ausbildung der laminaren Strömung in der Austrittsdüse, da das Wasser durch einen über die Gesamtbreite jedes einzelnen Wasserkastens gehenden siphonartigen überlauf bereits beruhigt in die Eintrittszone der Breitschlitzführung gelangt. Die negativen Einflüsse von Verwirbelungen beim Eintritt des Wassers aus der regelbaren Zuleitung in den Wasserkasten werden dadurch weitestgehend ausgeschaltet.In addition, the device according to the invention ensures a safe formation of the laminar flow in the outlet nozzle, since the water already reaches the entry zone of the slot slot guide in a calming manner through a siphon-like overflow that goes over the entire width of each individual water box. This largely eliminates the negative effects of turbulence when the water enters from the adjustable feed line into the water tank.

Schließlich vermeidet die Erfindung die "Knochenbildung" in der Auftreffzone des Wasservorhangs auf dem Walzgut. Bei der bekannten Vorrichtung kommt es nämlich durch das Zusammenfließen benachbarter Teilstücke des Wasservorhangs im Vergleich zur normalen Breite der Auftreffzone (Dicke des Wasservorhangs) jeweils zu einem mittleren Bereich mit einem zu geringen Wasserangebot, an den sich jeweils zu beiden Seiten ein Bereich mit einem zu großen Wasserangebot anschließt. Dieses Problem wird nach der Erfindung gelöst, indem nach Durchströmen der Breitschlitzführung eine weitere gezielte körperliche Führung der Wasservorhänge in ihren Randbereichen zur Vergleichmäßigung der Strömung und kontrollierten "Verschmelzung" der Ränder vorgesehen wird. Realisiert wird dies dadurch, daß die einzelnen Wasserkästen im Abstand voneinander angeordnet werden, so daß die Abschottung zwischen zwei unmittelbar benachbarten Wasserkästen nicht mehr als gemeinsame Trennwand sondern als Einzelwände ausgeführt ist. Die seitlichen Ränder der einzelnen Teilstücke des Wasservorhangs werden nach Durchströmen der konstante Breite und konstante lichte Weite aufweisenden Breitschlitzführung jeweils durch Leitstege schräg nach außen geführt, um sich am Ende der in Form einer konischen Verjüngung zusammenlaufenden benachbarten Leitstege zu vereinigen. Dieses Auseinanderziehen der Teilstücke des Wasservorhangs in den Randbereichen führt zu einer kontrollierten örtlichen Verringerung des Wasserangebotes.Finally, the invention avoids the "bone formation" in the impact zone of the water curtain on the rolling stock. In the known device, the confluence of adjacent sections of the water curtain compared to the normal width of the impact zone (thickness of the water curtain) results in a central area with too little water supply, on each side of which there is an area with a too large one Water supply connects. This problem is solved according to the invention by providing a further targeted physical guidance of the water curtains in their marginal areas after flowing through the slot slot guide in order to equalize the flow and controlled "fusion" of the edges. This is realized in that the individual water boxes are arranged at a distance from one another, so that the partition between two immediately adjacent water boxes is no longer designed as a common partition wall but as individual walls. The lateral edges of the individual sections of the water curtain, after flowing through the constant width and constant clear width, having the wide slot guide, are guided diagonally outwards through guide webs in order to unite at the end of the adjacent guide webs converging in the form of a conical taper. This pulling apart of the sections of the water curtain in the peripheral areas leads to a controlled local reduction in the water supply.

Da die Seitenwände der gemeinsamen Austrittsdüse aller Wasserkästen an den Breitseiten noch ein erhebliches Stück über das Ende der konischen Verjüngungen hinaus nach unten reichen, kann bis zum Erreichen der Austrittsebene der Austrittsdüse eine weitgehende Vergleichmäßigung der Strömung erzielt werden, die für manche Anwendungen bereits ausreichend ist. Turbulente Strömungen im Bereich der Nahtstelle benachbarter Teilstücke des Wasservorhangs können zu einem Großteil noch innerhalb der Austrittsdüse in eine laminare Strömung überführt werden. Um aber eine noch gleichmäßigere Dicke des Wasservorhangs zu gewährleisten, ist erfindungsgemäß vorgesehen, die lichte Weite der Austrittsdüse im Bereich unterhalb der konischen Verjüngungen jeweils gezielt zu verringern, indem z.B. auf der Innenseite der Austrittsdüse entsprechende mit ihrer Längsrichtung in Strömungsrichtung weisende Blechstreifen befestigt werden. Es empfiehlt sich, die Dicke dieser Streifen an den Längsrändern zu vermindern. In der Regel ist es ausreichend, wenn die Streifen auf einer der beiden Breitseitenwände der Austrittsdüse befestigt sind.Since the side walls of the common outlet nozzle of all water boxes on the broad sides still extend a considerable distance downwards beyond the end of the conical tapering, a largely uniform flow can be achieved until the outlet plane of the outlet nozzle is reached, which is already sufficient for some applications. Turbulent flows in the area of the interface between adjacent sections of the water curtain can largely be converted into a laminar flow within the outlet nozzle. However, in order to ensure an even more uniform thickness of the water curtain, it is provided according to the invention to reduce the clear width of the outlet nozzle in the area below the conical taper in a targeted manner, for example by on the inside of the outlet nozzle corresponding sheet metal strips with their longitudinal direction pointing in the flow direction are attached. It is advisable to reduce the thickness of these strips along the longitudinal edges. It is usually sufficient if the strips are attached to one of the two broad side walls of the outlet nozzle.

Anhand der in den Figuren dargestellten Zusammenhänge wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 eine erfindungsgemäße Wasserkastenanordnung im Längsschnitt,
  • Figur 2 einen Querschnitt durch die Wasserkastenanordnung gemäß Linie A-A in Figur 1,
  • Figur 3 einen Querschnitt durch die Wasserkastenanordnung gemäß Linie B-B in Figur 1,
  • Figur 4 einen Blechstreifen zur Verringerung der Durchflußweite in Ansicht und Draufsicht,
  • Figur 5 Härtemessungen an zwei Probestücken in Abhängigkeit von und 6 der Entfernung der Meßstelle von der Nahtstelle der Wasservorhangteilstücke,
The invention is explained in more detail with reference to the relationships shown in the figures. Show it:
  • FIG. 1 shows a water box arrangement according to the invention in longitudinal section,
  • FIG. 2 shows a cross section through the water box arrangement along line AA in FIG. 1,
  • FIG. 3 shows a cross section through the water tank arrangement along line BB in FIG. 1,
  • FIG. 4 shows a sheet metal strip for reducing the flow range in a view and a top view,
  • FIG. 5 hardness measurements on two specimens depending on and 6 the distance of the measuring point from the interface of the water curtain sections,

Die erfindungsgemäße Wasserkastenanordnung in Figur 1 zeigt im Längsschnitt eine Aufteilung in drei voneinander beabstandete Wasserkästen 1, die jeweils an eine getrennt regelbare Wasserzuleitung 2 angeschlossen sind. In Figur 2 ist diese Vorrichtung im Querschnitt entlang der Linie A-A und in Figur 3 im Querschnitt entlang der Linie B-B dargestellt. Das Wasser strömt in laminarer Form durch jeweils eine breitschlitzführung 3 aus dem Wasserkasten 1 im freien Fall nach unten aus. Hierzu trägt die siphonartige Überlaufvorrichtung bei, die durch die vertikal vom Deckel bzw. vom Boden des Wasserkastens 1 in den Flüssigkeitsstand hineinragenden über die gesamte Breite des Wasserkastens 1 gehenden Bleche 10 und 11 gebildet wird. Das Blech 11 bildet dabei zusammen mit der Begrenzungswand 6 die Breitschlitzführung 3, die über die gesamte Breite des Wasserkastens 1 die gleiche lichte Weite aufweist. Die Ränder der durch das ausströmende Wasser erzeugten drei Teilstücke des Wasservorhangs werden durch die Leitstege 1, die sich jeweils seitlich an die die schmale Seite der Breitschlitzführungen 3 begrenzende Wand 5 nach unten hin anschließen, aneinandergeführt.The water box arrangement according to the invention in FIG. 1 shows in longitudinal section a division into three spaced-apart water boxes 1, each of which is connected to a separately controllable water supply line 2. In Figure 2, this device is shown in cross section along the line A-A and in Figure 3 in cross section along the line B-B. The water flows in laminar form through a wide slot guide 3 from the water tank 1 in free fall downwards. The siphon-like overflow device contributes to this, which is formed by the sheets 10 and 11 which project vertically from the cover or the bottom of the water box 1 into the liquid level and extend over the entire width of the water box 1. The sheet 11 forms together with the boundary wall 6, the slot guide 3, which has the same clear width over the entire width of the water tank 1. The edges of the three sections of the water curtain produced by the outflowing water are brought together by the guide webs 1, each of which laterally adjoins the wall 5 delimiting the narrow side of the slot guides 3 downwards.

Hierzu sind benachbarte Leitstege 4 jeweils zueinander geneigt und an ihren Enden zu einer konischen Verjüngung miteinander verbunden. Die Seitenwände 6 aller Wasserkästen 1 sind ebenso wie die Bleche 11 unterhalb der Wasserkästen 1 verlängert und leiten die Breitschlitzfüh,ungen 3 in eine gemeinsame Austrittsdüse 7 fur alle Wasserkästen 1 über.For this purpose, adjacent guide webs 4 are each inclined to one another and connected to one another at their ends to form a conical taper. The side walls 6 of all water boxes 1, like the metal sheets 11, are extended below the water boxes 1 and guide the slot guides 3 into a common outlet nozzle 7 for all water boxes 1.

Die Austrittsebene der Austrittsdüse 7 ist mit dem Bezugszeichen 8 be2eichnet und liegt deutlich unterhalb der durch die Leitstege 4 gebildeten konischen Verjüngungen, so daß unterhalb dieser bis zur Austrittsebene 8 eine Zone zur Strömungsberuhigung entsteht. Im Bereich der Nahtstelle zweier benachbarter Teilstücke des Wasservorhangs ist die lichte Weite der Austrittsdüse 7 jeweils durch einen Blechstreifen 9, der auf der Innenseite des Bleches 11 befestigt ist, örtlich begrenzt verringert worden, um das Wasserangebot in den Nahtstellen über die durch die Leitstege 4 erreichte Verminderung hinaus zu begrenzen. Es ist auch möglich alternativ die Streifen 9 an der Begrenzungswand 6 oder an beiden zu befestigen.The exit plane of the outlet nozzle 7 is designated by the reference symbol 8 and lies clearly below the conical tapering formed by the guide webs 4, so that a zone for flow calming is created below this up to the exit plane 8. In the area of the interface between two adjacent sections of the water curtain, the clear width of the outlet nozzle 7 has been reduced locally in each case by a sheet metal strip 9, which is fastened to the inside of the sheet 11, in order to ensure that the water supply in the interfaces is reached via the guide bars 4 Limit reduction beyond. Alternatively, it is also possible to attach the strips 9 to the boundary wall 6 or to both.

Im folgenden wird anhand von zwei Beispielen der Einsatzerfolg einer erfindungsgemäßen Vorrichtung beim Abschrecken von Stahlrohren nachgewiesen.The success of a device according to the invention in quenching steel pipes is demonstrated below using two examples.

In Figur 5 bzw. Figur 6 sind die Ergebnisse von Härtemessungen an zwei gemäß der Erfindung behandelten Stahlrohren aus dem Werkstoff 29 CrMo 4 4 bzw. 20 CrMo 4 4 in Abhängigkeit von der Entfernung der Meßstelle von der Nahtstelle zweier Teilstücke eines Wasservorhangs graphisch dargestellt. Es wurden jeweils die Härtewerte an der inneren und äußeren Oberfläche sowie in der Mitte der Rohrwand ermittelt. Die Verläufe dieser Härtewerte lassen im Bereich der Nahtstelle weder eine erhöhte noch eine verminderte Kühlwirkung erkennen. Die absolute Höhe der Einzelwerte und ihre Schwankungsbreite entspricht durchaus dem bei planmäßiger Kühlung im günstigsten Fall zu erreichenden Verlauf.The results of hardness measurements on two steel tubes made of the material 29 CrMo 4 4 or 20 CrMo 4 4 treated according to the invention are shown graphically in FIG. 5 or FIG. 6 as a function of the distance of the measuring point from the interface of two sections of a water curtain. The hardness values on the inner and outer surface and in the middle of the pipe wall were determined. The course of these hardness values shows neither an increased nor a reduced cooling effect in the area of the interface. The absolute level of the individual values and their fluctuation range correspond entirely to the course that can be achieved in the best case with planned cooling.

Claims (3)

1. Apparatus for producing a water curtain for cooling rolled stock, in particular steel pipes, in such a manner that the water curtain strikes the surface of the rolled stock in a free fall with a laminar flow linearly over its entire length or entire width, containing a water tank unit subdivided into a plurality of water tanks (1) arranged adjacent to one another, in which each water tank (1) has its own separately controllable water feed pipe (2) and a wide-slot guide (3) for part of the water curtain to emerge, with a partition being located in each case between two directly adjacent water tanks (1), which partition tapers conically downwards, and the limiting walls (6, 11) on the broad sides of the wide-slot guides (3) being extended downwards past the conical taper of the partitions to form a common exit nozzle (7) for all the water tanks (1) and ending in a common exit plane (8),
characterised in that
the entry of each water tank (1) into the wide-slot guide (3) is designed as a siphon-type overflow (10, 11) which extends across the entire width of the water tank (1),
that the partitions between the water tanks (1) are designed as separate, spaced-apart limiting walls (5), that the limiting walls (5) beneath the wide-slot guide (3) each run obliquely outwards as guide bars (4) and form the conical tapers in pairs with the adjacent water tank (1)
and that the width of the throughflow opening of the common exit nozzle (7) is locally reduced in the region of the conical taper.
2. Apparatus according to Claim 1,
characterised in that
for the local reduction of the throughflow opening of the common exit nozzle (7) flat strips (9) of sheet metal or another material having a smooth surface are attached to the inner surfaces of the limiting walls (6 or 11).
3. Apparatus according to Claim 2,
characterised in that
the strips (9), when viewed in cross section transversely to the direction of flow, are thicker towards the centre and are thinner towards the long sides.
EP88908673A 1987-10-22 1988-10-12 Device for producing a water curtain Expired - Lifetime EP0383786B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88908673T ATE75639T1 (en) 1987-10-22 1988-10-12 DEVICE FOR CREATING A WATER CURTAIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736021 1987-10-22
DE3736021 1987-10-22

Publications (2)

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EP0383786A1 EP0383786A1 (en) 1990-08-29
EP0383786B1 true EP0383786B1 (en) 1992-05-06

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EP88908673A Expired - Lifetime EP0383786B1 (en) 1987-10-22 1988-10-12 Device for producing a water curtain

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CN (1) CN1034497A (en)
AT (1) ATE75639T1 (en)
DE (1) DE3870886D1 (en)
WO (1) WO1989003729A1 (en)

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Publication number Priority date Publication date Assignee Title
DE3914218C2 (en) * 1989-04-27 1994-08-18 Mannesmann Ag Method and apparatus for quenching an elongated metallic cylindrical body
DE3937626C1 (en) * 1989-11-09 1991-01-31 Mannesmann Ag, 4000 Duesseldorf, De
DE4335710C2 (en) * 1993-10-20 1996-11-21 Eko Stahl Gmbh Device for differentiated cooling of wide flat products
DE4337342A1 (en) * 1993-11-02 1995-05-04 Schloemann Siemag Ag Device for cooling rolled strips
EP3659436A1 (en) 2018-11-30 2020-06-03 Bayer AG Control of plants by means of electrical power
CN113845177B (en) * 2021-10-19 2023-01-17 太原科技大学 Purifier based on amorphous magnetically soft alloy

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Publication number Priority date Publication date Assignee Title
GB1595312A (en) * 1977-02-07 1981-08-12 Davy Loewy Ltd Cooling apparatus
GB2035526B (en) * 1978-10-02 1983-08-17 Centre Rech Metallurgique Cooling of rolled metal products
DE3334251C2 (en) * 1983-09-22 1986-04-10 Mannesmann AG, 4000 Düsseldorf Device for generating a water curtain for cooling sheet metal and strips
IT1177873B (en) * 1984-07-04 1987-08-26 Centro Speriment Metallurg DEVICE FOR COOLING HOT ROLLED FLATS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 5, No. 39, M 59, abstract JP 55-165216 publ 1980-12-23 (ISHIKAWAJIMA HARIMA JUKOGYO K.K) *

Also Published As

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DE3870886D1 (en) 1992-06-11
ATE75639T1 (en) 1992-05-15
WO1989003729A1 (en) 1989-05-05
EP0383786A1 (en) 1990-08-29
CN1034497A (en) 1989-08-09

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