EP0608286B1 - Hot-rolling process and hot-rolling mill for metal strip - Google Patents
Hot-rolling process and hot-rolling mill for metal strip Download PDFInfo
- Publication number
- EP0608286B1 EP0608286B1 EP92921087A EP92921087A EP0608286B1 EP 0608286 B1 EP0608286 B1 EP 0608286B1 EP 92921087 A EP92921087 A EP 92921087A EP 92921087 A EP92921087 A EP 92921087A EP 0608286 B1 EP0608286 B1 EP 0608286B1
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- EP
- European Patent Office
- Prior art keywords
- metal strip
- cooling liquid
- roll
- roll gap
- work rolls
- 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.)
- Expired - Lifetime
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- 239000002184 metal Substances 0.000 title claims abstract description 51
- 238000005098 hot rolling Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000009835 boiling Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000000110 cooling liquid Substances 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims 1
- 239000002826 coolant Substances 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract 4
- 238000005299 abrasion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- 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
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
Definitions
- a method for hot rolling metal strip in one or more passes is disclosed to the person skilled in the art in SU-A 1 227 275, it being on the inlet side and on the outlet side of the roll stand (s) together with their work rolls by spraying a cooling liquid in one cooling area extending over the entire width of the metal strip.
- the spraying of a cooling liquid on the feed side takes place in such a way that the roller surfaces are cooled to a temperature below the boiling point of the cooling liquid immediately before the roll gap.
- three differently arranged spray zones and thus cooling zones are provided on the inlet side of the roll strip into the roll gap on each work roll, all of which are separate from one another and each of these spray zones has to perform a specific function in itself.
- the invention has for its object to provide a hot rolling process and a hot rolling mill for metal strip, with which it is possible to roll metal strips without surface defects caused by defects (peeling points or abrasion) occurring on the surfaces of the work rolls.
- the invention is based on a process for hot rolling metal strip in one or more passes according to SU-A 1 227 275, which is the type of process.
- the solution according to the invention consists in that the spraying of the cooling liquid on the inlet side takes place in such a way that it is carried out exclusively by a series of flat jet nozzles, the core jets of which first strike the jacket of the work rolls or in the roll gap for direct cooling and that at the same time that incoming metal strip is acted upon by the radiant heat of the metal strip with the same cooling liquid to protect the roller shells, the spraying of the cooling liquid being regulated so that the metal strip is only cooled in a very thin outer zone.
- a hot rolling mill for metal strips consisting of one or more work rolls comprising rolling stands with the work rolls, at least on their inlet side, across the entire width of the metal strip to be rolled, assigned spray nozzles for a cooling liquid.
- the solution according to the invention consists in that only one row of nozzles consisting of flat jet nozzles is arranged on the inlet side above and below the incoming metal strip, the spray nozzles of each row of nozzles with their core jets being primarily directed towards the jackets of the work rolls or all into the roll gap.
- the cooling of work rolls in hot rolling mills is optimally used to keep the jackets of the work rolls at a temperature which is not critical for a deformation of the jackets.
- coolant is not only applied specifically to the jackets of the work rolls, but also to the sides of the incoming warm metal strip facing the work rolls, the cooling liquid sprayed onto the metal strip protects the jackets of the work rolls from the radiant heat of the metal strip.
- the cooling liquid preferably consists predominantly of water. Common lubricants can be added to the water.
- the boiling point of the coolant thus depends on the type and composition of the coolant.
- Such a coolant should be used, with which the surface temperature of the work rolls below a temperature of 90 ° C to 110 ° C is held.
- the surface temperature should preferably be brought to and maintained at a value of ⁇ 75 ° C., in particular ⁇ 50 ° C.
- the area to which cooling liquid is applied and which extends into the roll gap should have a maximum width of 800 mm, preferably less than 500 mm, in the rolling direction.
- the cooling intensity of the sprayed-on cooling liquid is particularly great when the spray nozzles are directed with their core jets onto the jackets of the work rolls.
- the cooling liquid primarily hits the jackets and is deflected into the roll gap and onto the metal strip.
- favorable turbulence is generated for uniform cooling of the metal strip, so that no strips which are detrimental to the strip quality can form on the metal strip surfaces or can be avoided.
- the roll stand has a lower and an upper work roll 1, 2 and supporting rolls 3, 4 supporting them.
- An incoming warm metal strip 5, in particular steel strip, with a thickness D is reduced to a thickness d in this roll stand.
- Spray nozzles 6, 7, 8, 9 for a cooling liquid are arranged on the inlet side of the metal strip 5 and on the outlet side over the entire width of the metal strip. While the outlet-side spray nozzles 8, 9 are directed towards the jackets of the work rolls 1, 2, the inlet-side spray nozzles 6, 7 are essentially directed towards or into the roll gap.
- At least the inlet-side spray nozzles 6, 7 are designed as flat jet nozzles, the spray cones of which overlap in the edge regions with an angle ⁇ such that this alone results in a uniform Cooling across the width of the metal strip 5 is achieved. While the core jets 10 of the lower spray nozzles 6 are directed exactly into the roll gap, the core jets 11 of the spray nozzles 7 are deflected by an angle ⁇ with respect to the jet direction in the roll gap, so that they strike the jacket of the work roll 2 at an angle and here in the direction of Volume 5 are distracted.
- This second setting of the core jets 11 is preferred because this leads to greater turbulence of the cooling liquid and the area covered by the spray cone with an opening angle ⁇ on the metal strip 5 has a smaller width a than the width a 'of the spray cone with the exactly in the roll gap directed core jets 10.
- this second setting causes in particular a uniform cooling of the metal strip in the areas with the width a and a '.
- the shells of the work rolls 1, 2 are assigned temperature sensors 12, 13. With them, the surface temperature of the jackets can be determined in order to adjust the temperature and volume of the coolant to be sprayed on in such a way that the jackets of the work rolls 1, 2 have a surface temperature at least immediately before the roll gap, which is below the boiling point of the cooling liquid. For this dimensioning, other influencing variables, such as the throughput speed of the metal strip 5 and possibly the surface temperature of the metal strip 5, can be taken into account, which can be determined by further sensors 14, 15.
Abstract
Description
Beim Warmwalzen von Metallband in einem aus einem oder mehreren Walzgerüsten bestehenden Walzwerk verformen sich die Arbeitswalzen infolge von Erwärmung in einem solchen Maß, daß mit ihnen ebene Bänder nicht mehr gewalzt werden können. Um dieser Verformung entgegenzuwirken, ist es aus der DE-C2 26 52 845 bekannt, die Arbeitswalzen durch direktes Aufsprühen von Kühlflüssigkeit auf deren Mäntel zu kühlen. Dieses Aufsprühen geschieht primär auf der Auslaufseite der Walzgerüste, wobei an den Arbeitswalzen, insbesondere auf der Zulaufseite der Gerüste wenn das Aufsprühen der Kühlflüssigkeit auch auf dieser Seite erfolgt, Abstreifer angestellt sind, die verhindern sollen, daß die Kühlflüssigkeit mit dem warmen einlaufenden Metallband in Berührung kommt.When hot-rolling metal strip in a rolling mill consisting of one or more rolling stands, the work rolls deform to such an extent as a result of heating that flat strips can no longer be rolled with them. In order to counteract this deformation, it is known from DE-C2 26 52 845 to cool the work rolls by spraying coolant directly onto their jackets. This spraying occurs primarily on the outlet side of the roll stands, wipers being employed on the work rolls, in particular on the feed side of the stands, when the cooling liquid is also sprayed on this side, which are intended to prevent the cooling liquid from coming into contact with the warm incoming metal strip is coming.
Darüber hinaus ist es bekannt, sowohl auf der Zulaufseite als auch auf der Auslaufseite der Walzgerüste die Arbeitswalzen durch Aufsprühen von Kühlflüssigkeit ausschließlich und unmittelbar auf die Mäntel der Arbeitswalzen zu kühlen (EP-B1 0 191 199). In diesem Fall fehlen auf der Zulaufseite an die Arbeitswalzen angestellte Abstreifer, so daß die Kühlflüssigkeit durch die Walzendrehung in den Walzspalt und damit über die Breite des einlaufenden Metallbandes ungleichmäßig verteilt mit dem Metallband vor Eintritt in den Walzspalt in Kontakt gelangen kann. Dies führt aufgrund der nicht gesteuerten bzw. geregelten und damit nicht gleichmäßigen Abkühlung des Bandes über seine Breite zur Ausbildung unerwünschter Streifen (sogenannte "Kühlstreifen") auf den Metallbandoberflächen, die in jedem Fall aus Qualitätsgründen zu vermeiden sind. Zwar hat die Praxis gezeigt, daß es mit dieser Art der Walzenkühlung möglich ist, einer Verformung der Arbeitswalzen entgegenzuwirken; es treten jedoch an den Oberflächen der Arbeitswalzen auch bei Anwendung dieses Verfahrens nach wie vor Oberflächenfehler in Form von umlaufenden Fehlstellen (Abtragungen) auf, die wie die Ausbildung der Streifen ebenfalls nachteilig für die Oberflächenqualität der zu walzenden Metallbänder sind.In addition, it is known to cool the work rolls exclusively and directly onto the jackets of the work rolls both on the inlet side and on the outlet side of the roll stands (EP-B1 0 191 199). In this case, there are no wipers attached to the work rolls on the feed side, so that the cooling liquid can come into contact with the metal strip unevenly distributed through the roll rotation into the roll gap and thus over the width of the incoming metal strip before it enters the roll gap. Because of the uncontrolled or regulated and thus not uniform cooling of the strip over its width, this leads to the formation of undesirable strips (so-called "cooling strips") on the metal strip surfaces which are in are to be avoided in any case for quality reasons. Practice has shown that with this type of roll cooling it is possible to counteract deformation of the work rolls; However, surface defects in the form of circumferential defects (abrasions) still occur on the surfaces of the work rolls even when this method is used, which, like the formation of the strips, are likewise disadvantageous for the surface quality of the metal strips to be rolled.
Schließlich ist noch bekannt, nicht nur die Mäntel der Arbeitswalzen, sondern auch das Band mit Kühlflüssigkeit zu beaufschlagen (EP-B1 0 138 503). Wie dabei die gleichzeitige Beaufschlagung des Metallbandes und der Arbeitswalzenoberflächen, insbesondere auf der Zulaufseite, im einzelnen verwirklicht werden soll, ist diesem vorbekannten Stand der Technik jedoch nicht zu entnehmen. Im Ausführungsbeispiel sind lediglich auf der Auslaufseite des Walzgerüstes den Arbeitswalzen Sprühdüsen zugeordnet.Finally, it is also known to apply coolant not only to the jackets of the work rolls, but also to the strip (EP-B1 0 138 503). How the simultaneous loading of the metal strip and the work roll surfaces, in particular on the feed side, is to be realized in detail is not to be found in this prior art. In the exemplary embodiment, spray nozzles are assigned to the work rolls only on the outlet side of the roll stand.
Ferner wird dem Fachmann in der SU-A 1 227 275 ein Verfahren zum Warmwalzen von Metallband in einem oder mehreren Stichen offenbart, wobei es auf der Zulaufseite und auf der Auslaufseite des bzw. der Walzgerüste zusammen mit deren Arbeitswalzen durch Aufsprühen einer Kühlflüssigkeit in einem sich über die gesamte Breite des Metallbandes erstreckenden Bereich gekühlt wird. Das Aufsprühen einer Kühlflüssigkeit auf der Zulaufseite erfolgt dergestalt, daß die Walzenoberflächen unmittelbar vor dem Walzspalt auf eine Temperatur unterhalb der Siedetemperatur der Kühlflüssigkeit gekühlt werden. Dabei sind auf der Einlaufseite des Walzbandes in den Walzspalt an jeder Arbeitswalze drei unterschiedlich voneinander angeordnete Sprühzonen und damit Kühlzonen vorgesehen, die alle voneinander getrennt sind und jede dieser Sprühzonen für sich genommen eine bestimmte Funktion zu erfüllen hat. Dies erfordert eine komplizierte Anlagentechnik, da vorausgesetzt werden muß, daß eine separate Trennung der Kühlzonen nur mit Hilfe komplizierter mechanischer Teile bewirkt werden kann. Darüber hinaus ist die Regeltechnik äußerst kompliziert, wenn den einzelnen Sprühzonen die unterschiedlichen Kühlfunktionen zugedacht sein sollen. Schließlich ist eine starke Abkühlung der Walzgutoberfläche vor der Umformung im Walzspalt nachteilig, da unkontrollierte Rückwirkungen auf Walzkraft und sonstige Umformbedingungen zu befürchten sind.Furthermore, a method for hot rolling metal strip in one or more passes is disclosed to the person skilled in the art in SU-
Der Erfindung liegt die Aufgabe zugrunde, ein Warmwalzverfahren und ein Warmwalzwerk für Metallband zu schaffen, mit dem es möglich ist, Metallbänder ohne durch auf den Oberflächen der Arbeitswalzen auftretende Fehler (Schälstellen bzw. Abtragungen) bedingte Oberflächenfehler zu walzen.The invention has for its object to provide a hot rolling process and a hot rolling mill for metal strip, with which it is possible to roll metal strips without surface defects caused by defects (peeling points or abrasion) occurring on the surfaces of the work rolls.
Bei der verfahrensmäßigen Lösung dieser Aufgabe geht die Erfindung von einem Verfahren zum Warmwalzen von Metallband in einem oder mehreren Stichen nach der die Verfahrensgattung bildenden SU-A 1 227 275 aus.In the process-related solution to this problem, the invention is based on a process for hot rolling metal strip in one or more passes according to SU-A 1 227 275, which is the type of process.
Die erfindungsgemäße Lösung besteht dabei darin, daß das Aufsprühen der Kühlflüssigkeit auf der Zulaufseite dergestalt erfolgt, daß es ausschließlich durch eine Reihe von Flachstrahldüsen vorgenommen wird, deren Kernstrahlen zur direkten Kühlung primär zunächst auf den Mantel der Arbeitswalzen oder in den Walzspalt auftreffen und daß gleichzeitig das einlaufende Metallband mit der gleichen Kühlflüssigkeit zum Schutze der Walzenmäntel von der Strahlungswärme des Metallbandes beaufschlagt wird, wobei das Aufsprühen der Kühlflüssigkeit so geregelt wird, daß das Metallband nur in einer sehr dünnen äußeren Zone gekühlt wird.The solution according to the invention consists in that the spraying of the cooling liquid on the inlet side takes place in such a way that it is carried out exclusively by a series of flat jet nozzles, the core jets of which first strike the jacket of the work rolls or in the roll gap for direct cooling and that at the same time that incoming metal strip is acted upon by the radiant heat of the metal strip with the same cooling liquid to protect the roller shells, the spraying of the cooling liquid being regulated so that the metal strip is only cooled in a very thin outer zone.
Vorrichtungsmäßig wird bei der Lösung dieser Aufgabe von einem Warmwalzwerk für Metallbänder aus einem oder mehreren Arbeitswalzen umfassenden Walzgerüsten ausgegangen mit den Arbeitswalzen mindestens auf deren Zulaufseite über die gesamte Breite des zu walzenden Metallbandes zugeordneten Sprühdüsen für eine Kühlflüssigkeit. Die erfindungsgemäße Lösung besteht dabei darin, daß auf der Zulaufseite oberhalb und unterhalb des einlaufenden Metallbandes nur eine aus Flachstrahldüsen bestehende Düsenreihe angeordnet ist, wobei die Sprühdüsen einer jeden Düsenreihe mit ihren Kernstrahlen primär alle auf die Mäntel der Arbeitswalzen oder alle in den Walzspalt gerichtet sind.In terms of the device, a hot rolling mill for metal strips consisting of one or more work rolls comprising rolling stands with the work rolls, at least on their inlet side, across the entire width of the metal strip to be rolled, assigned spray nozzles for a cooling liquid. The The solution according to the invention consists in that only one row of nozzles consisting of flat jet nozzles is arranged on the inlet side above and below the incoming metal strip, the spray nozzles of each row of nozzles with their core jets being primarily directed towards the jackets of the work rolls or all into the roll gap.
Mit der Erfindung wird die Kühlung von Arbeitswalzen in Warmwalzwerken optimal genutzt, um die Mäntel der Arbeitswalzen auf einer Temperatur zu halten, die für eine Verformung der Mäntel unkritisch ist. Da jedoch nicht nur die Mäntel der Arbeitswalzen gezielt mit Kühlflüssigkeit beaufschlagt werden, sondern auch die den Arbeitswalzen zugekehrten Seiten des einlaufenden warmen Metallbandes, schützt die auf das Metallband aufgesprühte Kühlflüssigkeit die Mäntel der Arbeitswalzen vor der Strahlungswärme des Metallbandes. Eine Wiedererwärmung der bereits abgekühlten Oberflächen der Arbeitswalzen kurz vor Eintritt in den Walzspalt, wie dies nach dem aus der DE-C2 26 52 845 bekannten Verfahren mit Abstreifern auf der Zulaufseite geschieht, findet damit nicht statt.With the invention, the cooling of work rolls in hot rolling mills is optimally used to keep the jackets of the work rolls at a temperature which is not critical for a deformation of the jackets. However, since coolant is not only applied specifically to the jackets of the work rolls, but also to the sides of the incoming warm metal strip facing the work rolls, the cooling liquid sprayed onto the metal strip protects the jackets of the work rolls from the radiant heat of the metal strip. A reheating of the already cooled surfaces of the work rolls shortly before entering the roll gap, as is done with wipers on the feed side according to the method known from DE-C2 26 52 845, does not take place with this.
Da darüber hinaus das Aufsprühen der Kühlflüssigkeit auf das Metallband auf einen unmittelbar vor dem Walzspalt befindlichen Bereich beschränkt wird, wird das Metallband auf beiden Seiten nur in einer sehr dünnen äußeren Zone abgekühlt, so daß dies für die anschließende Verformung zwischen den Arbeitswalzen unkritisch ist. Eine für den Walzschritt bzw. die Verformung nachteilige Abkühlung des Metallbandes über die Banddicke wird in jedem Fall vermieden.In addition, since the spraying of the cooling liquid onto the metal strip is restricted to an area immediately in front of the roll gap, the metal strip is cooled on both sides only in a very thin outer zone, so that this is not critical for the subsequent deformation between the work rolls. A disadvantageous cooling of the metal strip over the strip thickness for the rolling step or the deformation is avoided in any case.
Die Kühlflüssigkeit besteht vorzugsweise überwiegend aus Wasser. Dabei können dem Wasser übliche Schmiermittel zugesetzt sein. Die Siedetemperatur der Kühlflüssigkeit hängt somit von der Art und Zusammensetzung der Kühlflüssigkeit ab. Es sollte eine solche Kühlflüssigkeit verwendet werden, mit der die Oberflächentemperatur der Arbeitswalzen unterhalb einer Temperatur von 90°C bis 110°C gehalten wird. Vorzugsweise sollte die Oberflächentemperatur auf einen Wert von < 75°C, insbesondere < 50°C gebracht und gehalten werden. Der mit Kühlflüssigkeit beaufschlagte, bis in den Walzspalt reichende Bereich sollte in Walzrichtung eine maximale Breite von 800 mm, vorzugsweise von weniger als 500 mm haben.The cooling liquid preferably consists predominantly of water. Common lubricants can be added to the water. The boiling point of the coolant thus depends on the type and composition of the coolant. Such a coolant should be used, with which the surface temperature of the work rolls below a temperature of 90 ° C to 110 ° C is held. The surface temperature should preferably be brought to and maintained at a value of <75 ° C., in particular <50 ° C. The area to which cooling liquid is applied and which extends into the roll gap should have a maximum width of 800 mm, preferably less than 500 mm, in the rolling direction.
Die Kühlintensität der aufgesprühten Kühlflüssigkeit ist nach einer Ausgestaltung der Erfindung dann besonders groß, wenn die Sprühdüsen mit ihren Kernstrahlen auf die Mäntel der Arbeitswalzen gerichtet sind. In diesem Falle trifft die Kühlflüssigkeit primär zunächst auf die Mäntel auf und wird in den Walzspalt und auf das Metallband abgelenkt. Dadurch werden für eine gleichmäßige Kühlung des Metallbandes günstige Turbulenzen erzeugt, so daß sich auf den Metallbandoberflächen keine für die Bandqualität nachteiligen Streifen ausbilden können bzw. diese vermieden werden.According to one embodiment of the invention, the cooling intensity of the sprayed-on cooling liquid is particularly great when the spray nozzles are directed with their core jets onto the jackets of the work rolls. In this case, the cooling liquid primarily hits the jackets and is deflected into the roll gap and onto the metal strip. As a result, favorable turbulence is generated for uniform cooling of the metal strip, so that no strips which are detrimental to the strip quality can form on the metal strip surfaces or can be avoided.
Im folgenden wird die Erfindung anhand einer Zeichnung näher erläutert, die schematisch in Seitenansicht einen Schnitt durch ein Walzgerüst eines Warmwalzwerkes zeigt.The invention is explained in more detail below with the aid of a drawing which shows schematically a section through a roll stand of a hot rolling mill in a side view.
Das Walzgerüst weist eine untere und eine obere Arbeitswalze 1, 2 sowie diese abstützende Stützwalzen 3, 4 auf. In diesem Walzgerüst wird ein einlaufendes warmes Metallband 5, insbesondere Stahlband, mit einer Dicke D auf eine Dicke d reduziert. Auf der Zulaufseite des Metallbandes 5 und auf der Auslaufseite sind über die gesamte Breite des Metallbandes verteilt Sprühdüsen 6, 7, 8, 9 für eine Kühlflüssigkeit angeordnet. Während die auslaufseitigen Sprühdüsen 8, 9 auf die Mäntel der Arbeitswalzen 1, 2 gerichtet sind, sind die zulaufseitigen Sprühdüsen 6, 7 im wesentlichen auf bzw. in den Walzspalt gerichtet.The roll stand has a lower and an
Zumindest die zulaufseitigen Sprühdüsen 6, 7 sind als Flachstrahldüsen ausgebildet, deren Sprühkegel mit einem Winkel β in den Randbereichen derart überlappen, so daß schon dadurch eine gleichmäßige Kühlung über die Breite des Metallbandes 5 erreicht wird. Während die Kernstrahlen 10 der unteren Sprühdüsen 6 exakt in den Walzspalt gerichtet sind, sind die Kernstrahlen 11 der Sprühdüsen 7 gegenüber der Strahlrichtung in den Walzspalt um einen Winkel α abgelenkt, so daß sie schräg auf den Mantel der Arbeitswalze 2 treffen und hier in Richtung des Bandes 5 abgelenkt werden. Diese zweite Einstellung der Kernstrahlen 11 ist bevorzugt, weil es dadurch zu größeren Turbulenzen der Kühlflüssigkeit kommt und der vom Sprühkegel mit einem Öffnungswinkel β erfaßte Bereich auf dem Metallband 5 eine kleinere Breite a hat als die Breite a' des Sprühkegels mit den exakt in den Walzspalt gerichteten Kernstrahlen 10. Darüber hinaus bewirkt diese zweite Einstellung insbesondere eine gleichmäßige Kühlung des Metallbandes in den Bereichen mit der Breite a und a'.At least the inlet-
Den Mänteln der Arbeitswalzen 1, 2 sind Temperaturfühler 12, 13 zugeordnet. Mit ihnen läßt sich die Oberflächentemperatur der Mäntel feststellen, um das aufzusprühende Kühlmittel bezüglich Temperatur und Volumen derart einzustellen, daß die Mäntel der Arbeitswalzen 1, 2 mindestens unmittelbar vor dem Walzspalt eine Temperatur an der Oberfläche haben, die unterhalb der Siedetemperatur der Kühlflüssigkeit liegt. Für diese Bemessung können weitere Einflußgrößen, wie die Durchlaufgeschwindigkeit des Metallbandes 5 und gegebenenfalls die Oberflächentemperatur des Metallbandes 5 berücksichtigt werden, die durch weitere Fühler 14, 15 festgestellt werden können.The shells of the work rolls 1, 2 are assigned
Claims (8)
- Method for the hot rolling of metal strip (5) in one or more rolling passes, wherein it is cooled on the entry side and the exit side of the roll stand or stands, together with the working rolls (1, 2) thereof, by spraying on of a cooling liquid in a region extending over the entire width of the metal strip (5), wherein the spraying of the cooling liquid on the entry side is carried out in such a manner that the roll surfaces directly in front of the roll gap are cooled to a temperature below the boiling temperature of the cooling liquid, characterised thereby that the spraying of the cooling liquid on the entry side is carried out in such a manner that it is performed exclusively by a series of flat jet nozzles (6, 7), the core jets (10, 11) of which impinge primarily initially on the circumferential surface of the working rolls (1, 2), or into the roll gap, for direct cooling and at the same time the entering metal strip (5) is acted on by the same cooling liquid for protection of the roll circumferential surfaces from the radiation heat of the metal strip, wherein the spraying on of the cooling liquid is so regulated that the metal strip (5) is cooled only in a very thin outer zone.
- Method according to claim 1, characterised thereby that the cooling region, which reaches to into the roll gap, on the metal strip (5) has a maximum width (a, a') of 800 mm, preferably less than 500 mm.
- Method according to claim 1 or 2, characterised thereby that the cooling liquid predominantly consists of water.
- Method according to claim 1, 2 or 3, characterised thereby that the temperature at the surface of the circumferential surface of the working rolls (1, 2) is brought to and kept below 110°C.
- Method according to claim 4, characterised thereby that the temperature is kept to a value below 75°C, particularly below 50°C.
- Hot rolling mill for metal strips (5), consisting of one or more roll stands,which comprise working rolls (1, 2), and with spray nozzles (6, 7), which are associated with the working rolls (1, 2) at least on the entry side thereof over the entire width of the metal strip (5) to be rolled, for a cooling liquid, for use in a method according to claims 1 to 5, characterised thereby that only a nozzle series consisting of flat jet nozzles (6, 7) is arranged on the entry side above and below the entering metal strip (5), wherein the spray nozzles (6, 7) of one of each nozzle series are directed by their core jets (10, 11) primarily all onto the circumferential surface of the working rolls (1, 2) or all into the roll gap.
- Hot rolling mill according to claim 6, characterised thereby that the spray cone of the spray nozzles (6, 7) is directed by an opening angle (β) at the same time onto the metal strip (5).
- Hot rolling mill according to claim 6 or 7, characterised thereby that the spray cone of the spray nozzles (6, 7) has such an angle (β) that the maximum width (a, a') of the spray region, in front of the roll gap, on the metal strip (5) amounts to 800 mm, preferably less than 500 mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4134599A DE4134599C1 (en) | 1991-10-18 | 1991-10-18 | |
| DE4134599 | 1991-10-18 | ||
| PCT/EP1992/002314 WO1993007974A1 (en) | 1991-10-18 | 1992-10-08 | Hot-rolling process and hot-rolling mill for metal strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0608286A1 EP0608286A1 (en) | 1994-08-03 |
| EP0608286B1 true EP0608286B1 (en) | 1995-12-20 |
Family
ID=6443009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92921087A Expired - Lifetime EP0608286B1 (en) | 1991-10-18 | 1992-10-08 | Hot-rolling process and hot-rolling mill for metal strip |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5694799A (en) |
| EP (1) | EP0608286B1 (en) |
| KR (1) | KR100187334B1 (en) |
| CN (1) | CN1039102C (en) |
| AT (1) | ATE131754T1 (en) |
| CA (1) | CA2121341C (en) |
| DE (1) | DE4134599C1 (en) |
| ES (1) | ES2082510T3 (en) |
| MX (1) | MX9205952A (en) |
| TW (1) | TW207968B (en) |
| WO (1) | WO1993007974A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3422671B2 (en) * | 1997-12-05 | 2003-06-30 | 三菱重工業株式会社 | Method and apparatus for suppressing scale flaw generation during hot finish rolling |
| JP3784948B2 (en) * | 1997-12-05 | 2006-06-14 | 三菱重工業株式会社 | Method and apparatus for suppressing surface oxide film during hot finish rolling |
| DE19953230C2 (en) * | 1999-11-04 | 2003-08-28 | C D Waelzholz Produktionsgmbh | Cold rolling process |
| FR2803548B1 (en) * | 2000-01-10 | 2002-04-19 | Vai Clecim | METHOD AND DEVICE FOR THERMALLY CONTROLLING THE PROFILE OF A CYLINDER IN A ROLLER |
| DE10131369A1 (en) * | 2001-06-28 | 2003-01-09 | Sms Demag Ag | Method and device for cooling and lubricating rolls of a roll stand |
| DE10143252A1 (en) * | 2001-09-04 | 2003-03-20 | Sms Demag Ag | Device for applying lubricants to the peripheral surface of rolls in roll stands |
| JP4449908B2 (en) * | 2003-12-24 | 2010-04-14 | 住友金属工業株式会社 | Lubricant supply system, seamless pipe manufacturing apparatus, and seamless pipe manufacturing method |
| BE1017462A3 (en) * | 2007-02-09 | 2008-10-07 | Ct Rech Metallurgiques Asbl | DEVICE AND METHOD FOR COOLING ROLLING CYLINDERS IN HIGHLY TURBULENT. |
| KR100987527B1 (en) * | 2007-03-14 | 2010-10-13 | 가부시키가이샤 아이에이치아이 | Switchable multistage rolling mill |
| EP2014379A1 (en) * | 2007-06-04 | 2009-01-14 | ArcelorMittal France | Rolling mill with cooling device and rolling process |
| DE102008049537A1 (en) | 2008-09-30 | 2010-04-01 | Sms Siemag Aktiengesellschaft | Method and apparatus for cooling a sliver or strip of a metal strand in a hot rolling mill |
| KR101077174B1 (en) | 2009-04-21 | 2011-10-27 | 주식회사 포스코 | Cooling apparatus of workroll in in-line reduction mill |
| CN101966606B (en) * | 2010-09-26 | 2011-12-07 | 南京航空航天大学 | Method and device for controlling milling deformation of large sized structural member |
| JP6201430B2 (en) * | 2013-05-29 | 2017-09-27 | 新日鐵住金株式会社 | Lubricating oil supply method and lubrication rolling method for cold rolling mill |
| WO2017115110A1 (en) * | 2015-12-30 | 2017-07-06 | Arcelormittal | Process and device for cooling a metal substrate |
| JP6614339B2 (en) * | 2016-04-28 | 2019-12-04 | 日本製鉄株式会社 | Manufacturing method of H-section steel |
| CN108856314A (en) * | 2018-07-12 | 2018-11-23 | 西南铝业（集团）有限责任公司 | Coating metal band cooling device |
| CN109967704A (en) * | 2019-05-10 | 2019-07-05 | 中冶赛迪重庆信息技术有限公司 | A kind of continuous casting rolling device |
| KR102229519B1 (en) * | 2019-05-22 | 2021-03-18 | 한국원자력연구원 | METHOD FOR MANUFACTURING URANIUM TARGET TO BE SOLUBLE IN BASIC SOLUTION AND METHOD FOR EXTRACTING RADIOACTIVE Mo-99 USING THE SAME |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU127275A1 (en) * | 1959-09-19 | 1959-11-30 | Л.А. Быков | Sleep methodological furnace |
| US3301029A (en) * | 1964-07-06 | 1967-01-31 | Reynolds Metals Co | Working aluminous metals |
| SE309765B (en) * | 1964-12-08 | 1969-04-08 | Asea Ab | |
| JPS499031B1 (en) * | 1970-12-22 | 1974-03-01 | ||
| US3911704A (en) * | 1973-02-23 | 1975-10-14 | Aluminum Co Of America | Metal rolling |
| SU571313A1 (en) * | 1975-04-18 | 1977-09-05 | Московский Ордена Трудового Красного Знамени Институт Стали И Сплавов | Method of cooling rolls of hot rolling mills |
| DE2652845A1 (en) * | 1976-11-20 | 1978-05-24 | Schloemann Siemag Ag | DEVICE FOR COOLING WORK ROLLERS IN HOT STRIP MILLS |
| JPS5948688B2 (en) * | 1977-04-13 | 1984-11-28 | 株式会社日立製作所 | Coolant device for reversible rolling mill |
| US4247047A (en) * | 1979-01-15 | 1981-01-27 | Schaming Edward J | Modular zoned digital coolant control system for strip mill rolls |
| JPS5945444B2 (en) * | 1980-12-22 | 1984-11-06 | 新日本製鐵株式会社 | Roll cooling method in hot rolling |
| US4510784A (en) * | 1983-10-11 | 1985-04-16 | Kaiser Aluminum & Chemical Corporation | Rolling mill spray bar |
| SU1227275A1 (en) * | 1984-07-04 | 1986-04-30 | Всесоюзный Научно-Исследовательский И Проектный Институт По Очистке Технологических Газов,Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии | Method of cooling rolling mill rolls during rolling |
| NL8403821A (en) * | 1984-12-17 | 1986-07-16 | Hoogovens Groep Bv | Apparatus for cooling a working roller in a rolling mill for rolling metal strip. |
| JPH0755326B2 (en) * | 1986-03-27 | 1995-06-14 | 日本鋼管株式会社 | Cooling device for hot rolling roll |
| SU1426665A1 (en) * | 1987-07-10 | 1988-09-30 | Всесоюзный научно-исследовательский и проектно-конструкторский институт металлургического машиностроения им.А.И.Целикова | Method of cooling the rolling mill rolls and rolled stock |
-
1991
- 1991-10-18 DE DE4134599A patent/DE4134599C1/de not_active Expired - Fee Related
-
1992
- 1992-10-08 US US08/211,846 patent/US5694799A/en not_active Expired - Lifetime
- 1992-10-08 KR KR1019940701250A patent/KR100187334B1/en not_active IP Right Cessation
- 1992-10-08 WO PCT/EP1992/002314 patent/WO1993007974A1/en active IP Right Grant
- 1992-10-08 AT AT92921087T patent/ATE131754T1/en active
- 1992-10-08 EP EP92921087A patent/EP0608286B1/en not_active Expired - Lifetime
- 1992-10-08 CA CA002121341A patent/CA2121341C/en not_active Expired - Fee Related
- 1992-10-08 ES ES92921087T patent/ES2082510T3/en not_active Expired - Lifetime
- 1992-10-16 MX MX9205952A patent/MX9205952A/en not_active IP Right Cessation
- 1992-10-17 CN CN92112841A patent/CN1039102C/en not_active Expired - Fee Related
- 1992-11-02 TW TW081108706A patent/TW207968B/zh not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE131754T1 (en) | 1996-01-15 |
| CA2121341A1 (en) | 1993-04-29 |
| CN1039102C (en) | 1998-07-15 |
| WO1993007974A1 (en) | 1993-04-29 |
| MX9205952A (en) | 1993-06-01 |
| US5694799A (en) | 1997-12-09 |
| CA2121341C (en) | 2004-04-27 |
| EP0608286A1 (en) | 1994-08-03 |
| KR100187334B1 (en) | 1999-04-01 |
| CN1072620A (en) | 1993-06-02 |
| TW207968B (en) | 1993-06-21 |
| DE4134599C1 (en) | 1993-02-25 |
| ES2082510T3 (en) | 1996-03-16 |
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