EP2651577B1 - Method and apparatus for applying a lubricant while rolling metallic rolled stock - Google Patents

Method and apparatus for applying a lubricant while rolling metallic rolled stock Download PDF

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Publication number
EP2651577B1
EP2651577B1 EP11749856.8A EP11749856A EP2651577B1 EP 2651577 B1 EP2651577 B1 EP 2651577B1 EP 11749856 A EP11749856 A EP 11749856A EP 2651577 B1 EP2651577 B1 EP 2651577B1
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EP
European Patent Office
Prior art keywords
spray
lubricant
rolling
equipment according
fed
Prior art date
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Active
Application number
EP11749856.8A
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German (de)
French (fr)
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EP2651577A1 (en
Inventor
Valentin Atalla
Jian Chen
Gernot Dirisamer
Manfred Eder
Kurt Haller
Konrad Krimpelstätter
Krzysztof Mazurowski
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Primetals Technologies Austria GmbH
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Siemens VAI Metals Technologies GmbH Austria
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Priority to EP11749856.8A priority Critical patent/EP2651577B1/en
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Classifications

    • 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
    • B05B1/046—Outlets formed, e.g. cut, in the circumference of tubular or spherical elements
    • 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
    • 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
    • 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
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • 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
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0884—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point the outlet orifices for jets constituted by a liquid or a mixture containing a liquid being aligned
    • 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
    • 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
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0483—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with gas and liquid jets intersecting in the mixing chamber
    • 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
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes

Definitions

  • the invention relates generally to the technical field of rolling a metal rolling stock, in particular a rolling led in a nip between two work rolls, wherein a lubricant is used for the purpose of lubrication.
  • liquid or gaseous treatment media are used in the rolling of metallic rolling stock, for example a metal strip, for the purpose of lubrication and cooling.
  • These treatment media are different depending on the type of rolling process: in hot rolling, in which the rolling stock is heated to several 100 ° C, a water-oil emulsion is usually used; during cold rolling, in which the temperature of the rolling stock is usually below 100 ° C. before the rolling process, the lubrication in the roll gap is usually carried out by a cold rolling oil, wherein a cooling liquid is additionally used.
  • the invention is based on the object to provide a method and apparatus for applying a lubricant when rolling a metallic rolling stock, in which the lubricant consumption is minimized.
  • the medium used for roller gap lubrication is not a rolling fluid but a spray, that is to say a mixture of rolling oil and a carrier gas.
  • the lubricant is divided into finely distributed liquid droplets in an atomizer and introduced into the roll gap by means of the carrier gas. This application or introduction into the roll gap can take place either by spraying onto the surface of the work rolls, and / or onto the surface of the rolling stock entering the roll gap. Due to the homogeneous application of the lubricant as a spray, the lubricant consumption can be kept comparatively low.
  • the present in droplet form of lubricant very selectively wets only those areas of the surface of work roll and / or rolling, which are decisive for the friction during rolling.
  • the decisive factor is merely that a sufficient amount of oil for lubrication reaches the nip; this can in principle be achieved by spraying on the surface of the work rolls or on the surface of the incoming rolled strip, or on both surfaces.
  • the concentration of the lubricant in the nip is significantly higher. This increases the efficiency of the lubricant used, because just as much rolling oil passes into the rolling gap as required depending on the type of rolling stock to reduce friction in the nip is.
  • the invention allows a uniform application of the lubricant. This reduces the risk that set in the nip in the width direction different friction conditions.
  • spray nozzles which have at least two outlet openings. Depending on the shape of these at least two outlet openings, it is very easy to achieve a uniform surface concentration of the lubricant during application.
  • nozzles that are spherical have curved mouthpiece.
  • two symmetrical C-shaped slots are provided with respect to an axis of symmetry.
  • a spray can be formed with a comparatively small number of nozzles, which applies the lubricant evenly.
  • the cross section of these spray jets can be influenced.
  • the spray is formed from a juxtaposition of individual spray jets, each of these spray jets being directed in its width direction approximately parallel to the axis of the two work rolls.
  • a carrier medium for the lubricant droplets can be used in a simple embodiment of the process air.
  • FIG. 1 shows in a highly simplified representation of a vertical section through a roll stand.
  • the rolling stand consists essentially of the two work rolls 2 'and 2'', and the respective support rollers 3' and 3 ''.
  • a rolled strip 28 is passed between the two work rolls 2 'and 2''in the direction indicated by the arrow from left to right.
  • the device 1 according to the invention is sketched in each case on the upper side and the underside of the rolled strip 28, which sprays an atomised rolling oil in the direction of the roll gap 8.
  • the atomization of the rolling oil takes place in each case in a atomizing device 4, which is supplied via lines 6 and 7 rolling oil or air.
  • a mixture of air and lubricant particles is formed, which is applied by means of an array of spray nozzles 5 as a spray.
  • This spray is deposited on the surface 21 of the work rolls 2 'and 2' 'and / or on the surface 23 of the rolled strip 28, whereby the desired reduction in the friction conditions in the nip 8 is effected.
  • rolling oil is collected together with the coolant and recycled by means of a conveying and reprocessing plant.
  • FIG. 2 shows an array of spray nozzles 5 on a spray bar 13.
  • Each spray nozzle 5 is fed via a first line 6 rolling oil and via a second line 7 air.
  • Each spray nozzle 5 generates a spray jet 9, which is formed flat in cross section 15 seen. The juxtaposition of these individual flat spray jets 9 forms a total with respect to the oil concentration total spray 19th
  • FIG. 3 shows a cross-sectional view of the atomizing device 4.
  • this atomizing device 4 is supplied via a connecting line 6 rolling oil and via another connecting line 7 air.
  • the generation of the oil-air mixture takes place in a manner known per se: In a swirling chamber 31, the two media air 27 and oil 26 meet.
  • the air 27, which flows at high speed past an orifice of the rolling oil feed 6, entrains oil particles 26, so that a mixture of air and finely divided oil-liquid droplets forms in the swirling chamber 31. Size and design of these liquid droplets can be adjusted in each case by the amount of media supplied and by blending in a wide range.
  • These diaphragms in the inlet of air and oil are interchangeable in the atomizer 4.
  • This mixture is fed via a short connector of a spray nozzle 5.
  • the spray nozzle 5 is spherically curved in the region of an orifice 18.
  • two outlet openings 10 are formed in the area of the spherical curvature 12.
  • Each of these outlet openings 10 is formed by a slot in the region of the mouth 18. The preparation of this slot in the spherical curvature 10 can be easily done by a cut with a saw blade.
  • FIG. 4 shows two views of the mouthpiece 18: in the upper view, the mouthpiece 18 is shown in a sectional view, in the lower view in a three-dimensional view.
  • the mouthpiece 18 is convexly curved outwards.
  • the curvature 12 is a circular arc.
  • a corresponding curvature is also formed on the inner wall of the mouthpiece 18.
  • two outlet openings 10 formed by cuts for the mixture are to be seen, which - seen in a direction opposite to the outflow direction - each have the shape of a "C".
  • the arrangement of these two C-shaped outlet openings 10 is chosen so that the legs 25 of the two "C" from an axis of symmetry 11 point away.
  • the two incisions "C" are back-to-back.
  • the production of these outlet openings 10 is effected by cuts.
  • the planes of the incisions 10 are at an angle 30 to each other.
  • the slot width 14 of these cuts is advantageously between about 0.6 to 0.7 mm.
  • FIG. 5 illustrates in a highly simplified representation of the lubrication in the nip
  • the upper diagram shows the lubrication with emulsion according to the state of Technique
  • the lower illustration represents the inventive application of the rolling oil by means of a spray.
  • the lubricant concentration in the nip 8 is lower than in the introduction of the Lubricant in the form of a spray, which is shown in the lower part of the FIG. 5 is illustrated.
  • a higher concentration of lubricant forms in the nip 8 compared to emulsion lubrication.
  • a comparatively low oil consumption of 50 ml per minute to 200 ml per minute per rolling mill can be achieved.
  • Another advantage results from the greatly reduced friction in the nip, whereby the rolling forces and rolling moments for the rolling process can be reduced. Especially during cold rolling, a very good surface quality of the rolled strip can be achieved.

Description

Technisches GebietTechnical area

Die Erfindung betrifft allgemein das technische Gebiet des Walzens eines metallischen Walzgutes, insbesondere eines in einem Walzspalt zwischen zwei Arbeitswalzen hindurch geführten Walzbandes, wobei zum Zwecke der Schmierung ein Schmiermittel verwendet wird.The invention relates generally to the technical field of rolling a metal rolling stock, in particular a rolling led in a nip between two work rolls, wherein a lubricant is used for the purpose of lubrication.

Stand der TechnikState of the art

Es ist bekannt, dass beim Walzen von metallischem Walzgut, beispielsweise eines Metallbandes, zum Zwecke der Schmierung und der Kühlung flüssige oder gasförmige Behandlungsmedien verwendet werden. Diese Behandlungsmedien sind je nach Typ des Walzprozesses unterschiedlich: beim Warmwalzen, bei dem das Walzgut auf mehrere 100°C erhitzt wird, wird üblicherweise eine Wasser-Öl-Emulsion verwendet; beim Kaltwalzen, bei dem die Temperatur des Walzgutes vor dem Walzvorgang üblicherweise unterhalb von 100° C liegt, erfolgt die Schmierung im Walzspalt meist durch ein Kaltwalzöl, wobei zusätzlich eine Kühlflüssigkeit verwendet wird.It is known that liquid or gaseous treatment media are used in the rolling of metallic rolling stock, for example a metal strip, for the purpose of lubrication and cooling. These treatment media are different depending on the type of rolling process: in hot rolling, in which the rolling stock is heated to several 100 ° C, a water-oil emulsion is usually used; during cold rolling, in which the temperature of the rolling stock is usually below 100 ° C. before the rolling process, the lubrication in the roll gap is usually carried out by a cold rolling oil, wherein a cooling liquid is additionally used.

Aus der US 2 960 064 A ist ein Verfahren zum Aufbringen eines Schmiermittels beim Walzen eines Metallbandes bekannt, bei dem ein Gemisch aus Schmiermittel und einem Trägergas in einer Zerstäubungseinrichtung erzeugt wird. Dieses Gemisch wird einer Anordnung von Sprühdüsen zugeführt, wobei der sich daraus gebildete Gesamt-Sprühstrahl auf die Oberfläche von Arbeitswalzen bzw. eines Walzbandes aufgetragen wird.From the US Pat. No. 2,960,064 For example, a method for applying a lubricant when rolling a metal strip is known in which a mixture of lubricant and a carrier gas is produced in a sputtering device. This mixture is supplied to an array of spray nozzles, wherein the total spray formed therefrom is applied to the surface of work rolls or a rolled strip.

Obwohl die zugeführte Walzflüssigkeit sowohl beim Warmwalzen als auch beim Kaltwalzen am Gerüstboden aufgefangen und nach einer Aufbereitung im Walzprozess prinzipiell wieder verwendet werden kann, ist man bestrebt, den Verbrauch an Schmier- und Kühlmittel möglichst gering zu halten.Although the supplied rolling fluid collected during both hot rolling and cold rolling on the scaffold floor and can be used in principle after a preparation in the rolling process, it is anxious to keep the consumption of lubricant and coolant as low as possible.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren und eine Vorrichtung zum Aufbringen eines Schmiermittels beim Walzen eines metallischen Walzgutes anzugeben, bei dem der Schmiermittelverbrauch möglichst gering ist.The invention is based on the object to provide a method and apparatus for applying a lubricant when rolling a metallic rolling stock, in which the lubricant consumption is minimized.

Diese Aufgabe wird durch ein Verfahren gemäß den Merkmalen des Anspruchs 1 und durch eine Vorrichtung gemäß den Merkmalen des Anspruchs 9 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den jeweils abhängigen Ansprüchen definiert.This object is achieved by a method according to the features of claim 1 and by a device according to the features of claim 9. Advantageous embodiments of the invention are defined in the respective dependent claims.

Gemäß einem Grundgedanken der Erfindung wird als Medium zur Walzspaltschmierung nicht eine Walzflüssigkeit, sondern ein Spray, das heißt ein Gemisch aus Walzöl und einem Trägergas verwendet. Das Schmiermittel wird in einem Zerstäuber in fein verteilte Flüssigkeitstropfen zerteilt und mittels des Trägergases in den Walzspalt eingetragen. Dies Aufbringen beziehungsweise Einbringen in den Walzspalt kann entweder durch Sprühen auf die Oberfläche der Arbeitswalzen, und/oder auf die Oberfläche des in den Walzspalt einlaufenden Walzgutes erfolgen. Durch den homogenen Auftrag des Schmiermittels als Spray, kann der Schmiermittel-Verbrauch vergleichsweise gering gehalten werden. Das in Tröpfchenform vorliegende Schmiermittel benetzt sehr gezielt nur jene Bereiche der Oberfläche von Arbeitswalze und/oder Walzgut, welche für die Reibung beim Walzen maßgeblich sind. Entscheidend ist dabei lediglich, dass eine zur Schmierung ausreichende Ölmenge in den Walzspalt gelangt; dies kann grundsätzlich durch ein Aufsprühen auf die Oberfläche der Arbeitswalzen oder auf die Oberfläche des einlaufenden Walzbandes, oder auf beide Oberflächen erreicht werden. Verglichen mit einer Emulsion, ist die Konzentration des Schmiermittels im Walzspalt deutlich höher. Damit erhöht sich die Effizienz des eingesetzten Schmierstoffs, denn in den Walzspalt gelangt gerade so viel Walzöl, wie je nach Art des Walzgutes zur Verringerung der Reibung im Walzspalt gefordert ist. In Breitenrichtung des Walzbandes gesehen ermöglicht die Erfindung einen gleichmäßigen Auftrag des Schmiermittels. Dadurch verringert sich die Gefahr, dass sich im Walzspalt in Breitenrichtung unterschiedliche Reibungsverhältnisse einstellen. Dies ist insbesondere beim Kaltwalzen von besonderem Vorteil, da die gewünschte Enddicke des Metalls vergleichsweise gering ist und es leicht zu einem lokalen Brechen des Schmierfilms kommen kann. Außerdem wird beim Kaltwalzen in der Regel eine gute Oberflächenqualität des Metallbandes angestrebt, was eine ausreichende Schmierung im Walzspalt voraussetzt. Ein weiterer Vorteil ist darin zu sehen, dass der Schmierstoff in reiner Form, dass heißt nicht in Form einer Emulsion, verwendet wird, so dass ein Emulgator im Schmierstoff nicht erforderlich ist. Dadurch ergibt sich der Vorteil, dass das Öl verhältnismäßig leicht vom Kühlmittel, z.B. Wasser, getrennt und gegebenenfalls nach einer Aufbereitung wieder verwendet, das heißt in einem Umlauf geführt werden kann.According to a basic idea of the invention, the medium used for roller gap lubrication is not a rolling fluid but a spray, that is to say a mixture of rolling oil and a carrier gas. The lubricant is divided into finely distributed liquid droplets in an atomizer and introduced into the roll gap by means of the carrier gas. This application or introduction into the roll gap can take place either by spraying onto the surface of the work rolls, and / or onto the surface of the rolling stock entering the roll gap. Due to the homogeneous application of the lubricant as a spray, the lubricant consumption can be kept comparatively low. The present in droplet form of lubricant very selectively wets only those areas of the surface of work roll and / or rolling, which are decisive for the friction during rolling. The decisive factor is merely that a sufficient amount of oil for lubrication reaches the nip; this can in principle be achieved by spraying on the surface of the work rolls or on the surface of the incoming rolled strip, or on both surfaces. Compared with an emulsion, the concentration of the lubricant in the nip is significantly higher. This increases the efficiency of the lubricant used, because just as much rolling oil passes into the rolling gap as required depending on the type of rolling stock to reduce friction in the nip is. Seen in the width direction of the rolled strip, the invention allows a uniform application of the lubricant. This reduces the risk that set in the nip in the width direction different friction conditions. This is particularly advantageous when cold rolling, since the desired final thickness of the metal is comparatively low and it can easily lead to a local breakage of the lubricating film. In addition, in cold rolling usually a good surface quality of the metal strip is sought, which requires adequate lubrication in the nip. Another advantage is the fact that the lubricant is used in pure form, that is not in the form of an emulsion, so that an emulsifier in the lubricant is not required. This results in the advantage that the oil relatively easily from the coolant, such as water, separated and optionally reused after treatment, that can be performed in a single circulation.

Um eine über die Querschnittsfläche des Sprühstrahls gesehen möglichst homogene Verteilung des Schmiermittels zu erreichen, werden Sprühdüsen verwendet, die zumindest zwei Austrittsöffnungen aufweisen. Je nach Form dieser zumindest zwei Austrittsöffnungen lässt sich sehr gut eine gleichmäßige Flächenkonzentration des Schmiermittels beim Auftrag erreichen.In order to achieve a distribution of the lubricant which is as homogeneous as possible, viewed over the cross-sectional area of the spray jet, spray nozzles are used which have at least two outlet openings. Depending on the shape of these at least two outlet openings, it is very easy to achieve a uniform surface concentration of the lubricant during application.

Günstig ist, wenn das Auftragen des Schmiermittels durch einzelne Sprühdüsen erfolgt, welche in einer Reihe angeordnet sind und jeweils einen im Querschnitt gesehen im Wesentlichen flach ausgebildeten Sprühstrahl erzeugen. Die einzelnen Querschnitte können sich dabei im Randbereich überlagern. Auf diese Weise kann über die Breite des Walzbandes gesehen ein fächerförmiger Gesamt-Sprühstrahl erzeugt werden, mit dem das Schmiermittel homogen und gezielt in den Walzspalt eingebracht werden kann.It is favorable if the application of the lubricant takes place by means of individual spray nozzles, which are arranged in a row and in each case produce a spray jet which is essentially flat when viewed in cross-section. The individual cross sections can overlap in the edge area. In this way, viewed over the width of the rolled strip, a fan-shaped overall spray can be generated, with which the lubricant can be introduced homogeneously and selectively into the roll gap.

Für einen gleichmäßigen Schmiermittel-Auftrag kann es günstig sein, wenn Düsen verwendet werden, die ein sphärisch gekrümmtes Mundstück aufweisen. Auf diesem gekrümmten Mundstück sind zwei bezüglich einer Symmetrieachse symmetrisch ausgebildete C-förmige Schlitze vorgesehen. Dadurch kann mit einer vergleichsweise geringen Anzahl von Düsen ein Spray gebildet werden, der das Schmiermittel gleichmäßig aufträgt. Je nach Tiefe und Winkellage dieser Schlitze kann der Querschnitt dieser Sprühstrahlen beeinflusst werden.For a uniform lubricant application, it may be beneficial to use nozzles that are spherical have curved mouthpiece. On this curved mouthpiece two symmetrical C-shaped slots are provided with respect to an axis of symmetry. As a result, a spray can be formed with a comparatively small number of nozzles, which applies the lubricant evenly. Depending on the depth and angular position of these slots, the cross section of these spray jets can be influenced.

Um das Schmiermittel möglichst effizient in den Walzspalt einzubringen kann es vorteilhaft sein, wenn der Spray aus einer Aneinanderreihung von einzelnen Sprühstrahlen gebildet wird, wobei jeder dieser Sprühstrahlen in seiner Breitenrichtung gesehen etwa parallel zur Achse der beiden Arbeitswalzen gerichtet wird.In order to introduce the lubricant as efficiently as possible into the roll gap, it may be advantageous if the spray is formed from a juxtaposition of individual spray jets, each of these spray jets being directed in its width direction approximately parallel to the axis of the two work rolls.

Als Trägermedium für die Schmierstofftröpfchen kann in einfacher Ausgestaltung des Verfahrens Luft verwendet werden.As a carrier medium for the lubricant droplets can be used in a simple embodiment of the process air.

Hinsichtlich des Energieeinsatzes kann es von besonderem Vorteil sein, wenn Walzöl verwendet wird, welches nicht erhitzt, sondern im Wesentlichen mit einer Temperatur verwendet wird, welche der Umgebungstemperatur entspricht.With regard to the use of energy, it can be of particular advantage when rolling oil is used which is not heated but is used essentially at a temperature which corresponds to the ambient temperature.

Kurzbeschreibung der ZeichnungBrief description of the drawing

Zur weiteren Erläuterung der Erfindung wird im nachfolgenden Teil der Beschreibung auf die Zeichnungen Bezug genommen, aus denen weitere vorteilhafte Ausgestaltungen, Einzelheiten und Weiterbildungen der Erfindung anhand eines nicht einschränkenden Ausführungsbeispiels zu entnehmen sind.To further explain the invention, reference is made in the following part of the description to the drawings, from which further advantageous embodiments, details and further developments of the invention can be found by way of non-limiting embodiment.

Es zeigen:

Figur 1
einen schematischen Vertikalschnitt durch ein Walzgerüst, der Anordnung der erfindungsgemäße Vorrichtung zur Einbringung eines Schmiermittels in den Walzspalt;
Figur 2
einen Sprühbalken mit aneinander gereihten Sprühdüsen in einer räumlichen Darstellung, wobei der aus einzelnen Sprühstrahlen zusammengesetzte Gesamt-Sprühstrahl skizziert ist;
Figur 3
eine Schnittdarstellung einer Zerstäubungseinrichtung samt Sprühdüse;
Figur 4
eine Ausführungsform des Mundstücks einer Sprühdüse in einer räumlichen und in einer geschnittenen Darstellung;
Figur 5
eine Detaildarstellung der Walzspaltschmierung in einer vergleichenden Darstellung zwischen einer Schmierung mit Emulsion und einer Schmierung mit Walzöl.
Show it:
FIG. 1
a schematic vertical section through a roll stand, the arrangement of the invention Apparatus for introducing a lubricant into the roll gap;
FIG. 2
a spray bar with juxtaposed spray nozzles in a spatial representation, wherein the composite of individual spray jets total spray is outlined;
FIG. 3
a sectional view of a sputtering device including spray nozzle;
FIG. 4
an embodiment of the mouthpiece of a spray nozzle in a spatial and in a sectional view;
FIG. 5
a detailed representation of the rolling gap lubrication in a comparative representation between lubrication with emulsion and lubrication with rolling oil.

Ausführung der ErfindungEmbodiment of the invention

Die Figur 1 zeigt in einer stark vereinfachten Darstellung einen vertikalen Schnitt durch ein Walzgerüst. Das Walzgerüst besteht im Wesentlichen aus den beiden Arbeitswalzen 2' und 2'', sowie den jeweiligen Stützwalzen 3' und 3''. Im Walzspalt 8 wird zwischen den beiden Arbeitswalzen 2' und 2'' ein Walzband 28 in der durch den Pfeil angegebenen Richtung von links nach rechts hindurchgeführt. Einlaufseitig ist jeweils an der Oberseite und der Unterseite des Walzbandes 28 die erfindungsgemäße Vorrichtung 1 skizziert, welche ein verdüstes Walzöl in Richtung des Walzspaltes 8 sprüht. Die Zerstäubung des Walzöls erfolgt jeweils in einer Zerstäubungseinrichtung 4, welcher über Leitungen 6 bzw. 7 Walzöl bzw. Luft zugeführt wird.The FIG. 1 shows in a highly simplified representation of a vertical section through a roll stand. The rolling stand consists essentially of the two work rolls 2 'and 2'', and the respective support rollers 3' and 3 ''. In the nip 8, a rolled strip 28 is passed between the two work rolls 2 'and 2''in the direction indicated by the arrow from left to right. On the inlet side, the device 1 according to the invention is sketched in each case on the upper side and the underside of the rolled strip 28, which sprays an atomised rolling oil in the direction of the roll gap 8. The atomization of the rolling oil takes place in each case in a atomizing device 4, which is supplied via lines 6 and 7 rolling oil or air.

Wie unten stehend noch näher erläutert, wird in der Zerstäubungseinrichtung 4 ein Gemisch aus Luft und Schmiermittelteilchen gebildet, welches mittels einer Anordnung von Sprühdüsen 5 als Spray aufgetragen wird. Dieser Spray schlägt sich auf der Oberfläche 21 der Arbeitswalzen 2' und 2'' und/oder an der Oberfläche 23 des Walzbandes 28 nieder, wodurch die angestrebte Herabsetzung der Reibungsverhältnisse im Walzspalt 8 bewirkt wird. In der Wanne 17 wird Walzöl zusammen mit dem Kühlmittel aufgefangen und mittels einer Förder- und Wiederaufbereitungsanlage recycelt.As explained in more detail below, in the atomizing device 4, a mixture of air and lubricant particles is formed, which is applied by means of an array of spray nozzles 5 as a spray. This spray is deposited on the surface 21 of the work rolls 2 'and 2' 'and / or on the surface 23 of the rolled strip 28, whereby the desired reduction in the friction conditions in the nip 8 is effected. In the tub 17 rolling oil is collected together with the coolant and recycled by means of a conveying and reprocessing plant.

Die Figur 2 zeigt eine Anordnung von Sprühdüsen 5 auf einem Sprühbalken 13. Jeder Sprühdüse 5 ist jeweils über eine erste Leitung 6 Walzöl und über eine zweite Leitung 7 Luft zugeführt. Jede Sprühdüse 5 erzeugt einen Sprühstrahl 9, der im Querschnitt 15 gesehen flach ausgebildet ist. Die Aneinanderreihung dieser einzelnen flachen Sprühstrahlen 9 bildet einen hinsichtlich der Ölkonzentration homogenen Gesamt-Sprühstrahl 19.The FIG. 2 shows an array of spray nozzles 5 on a spray bar 13. Each spray nozzle 5 is fed via a first line 6 rolling oil and via a second line 7 air. Each spray nozzle 5 generates a spray jet 9, which is formed flat in cross section 15 seen. The juxtaposition of these individual flat spray jets 9 forms a total with respect to the oil concentration total spray 19th

Die Figur 3 zeigt eine Schnittzeichnung der Zerstäubungseinrichtung 4. Wie bereits gesagt wird dieser Zerstäubungseinrichtung 4 jeweils über eine Anschlussleitung 6 Walzöl und über eine andere Anschlussleitung 7 Luft zugeführt. Die Erzeugung des Öl-Luft-Gemischs erfolgt in an sich bekannter Weise: In einer Verwirbelungskammer 31 treffen die beiden Medien Luft 27 und Öl 26 aufeinander. Die mit hoher Geschwindigkeit an einer Blende des Walzöl-Zulaufs 6 vorbei strömende Luft 27 reißt dabei Öl-Partikel 26 mit, so dass sich in der Verwirbelungskammer 31 ein Gemisch aus Luft und fein verteilten Öl-Flüssigkeitströpfchen bildet. Größe und Ausbildung dieser Flüssigkeitströpfchen können dabei jeweils durch die Menge der zugeführten Medien und durch Blenden in einem breiten Bereich eingestellt werden. Diese Blenden im Zulauf von Luft und Öl sind in der Zerstäubungseinrichtung 4 auswechselbar. Dadurch ist es möglich, je nach Anforderung ein geeignetes Gemisch aus Luft und Flüssigkeitsteilchen herzustellen. Dieses Gemisch wird über ein kurzes Verbindungsstück einer Sprühdüse 5 zugeführt. Die Sprühdüse 5 ist im Bereich einer Mündung 18 sphärisch gekrümmt. Im Bereich der sphärischen Krümmung 12 sind zwei Austrittsöffnungen 10 ausgebildet. Jede dieser Austrittsöffnungen 10 wird durch einen Schlitz im Bereich der Mündung 18 gebildet. Die Herstellung dieses Schlitzes in der sphärischen Krümmung 10 kann einfach durch einen Einschnitt mit einem Sägeblatt erfolgen.The FIG. 3 shows a cross-sectional view of the atomizing device 4. As already said, this atomizing device 4 is supplied via a connecting line 6 rolling oil and via another connecting line 7 air. The generation of the oil-air mixture takes place in a manner known per se: In a swirling chamber 31, the two media air 27 and oil 26 meet. The air 27, which flows at high speed past an orifice of the rolling oil feed 6, entrains oil particles 26, so that a mixture of air and finely divided oil-liquid droplets forms in the swirling chamber 31. Size and design of these liquid droplets can be adjusted in each case by the amount of media supplied and by blending in a wide range. These diaphragms in the inlet of air and oil are interchangeable in the atomizer 4. That's it possible to produce a suitable mixture of air and liquid particles as required. This mixture is fed via a short connector of a spray nozzle 5. The spray nozzle 5 is spherically curved in the region of an orifice 18. In the area of the spherical curvature 12, two outlet openings 10 are formed. Each of these outlet openings 10 is formed by a slot in the region of the mouth 18. The preparation of this slot in the spherical curvature 10 can be easily done by a cut with a saw blade.

Die Figur 4 zeigt zwei Ansichten des Mundstücks 18: in der oberen Darstellung ist das Mundstück 18 in einer geschnittenen Ansicht, in der unteren Darstellung in einer räumlichen Ansicht zu sehen. Das Mundstück 18 ist nach außen konvex gekrümmt. In der vorliegenden Ausführungsform ist die Krümmung 12 ein Kreisbogen. Eine korrespondierende Krümmung ist auch an der inneren Wand des Mundstücks 18 ausgebildet. Am Zenit der Krümmung 12 sind zwei durch Einschnitte gebildete Austrittsöffnungen 10 für das Gemisch zu sehen, die - in einer der Ausströmrichtung entgegengesetzten Richtung gesehen - jeweils die Form eines "C " aufweisen. Die Anordnung dieser beiden C-förmigen Austrittsöffnungen 10 ist dabei so gewählt, dass die Schenkel 25 der beiden "C" von einer Symmetrieachse 11 weg weisen. Anders ausgedrückt, die beiden Einschnitte "C" liegen Rücken-an-Rücken. Die Herstellung dieser Austrittsöffnungen 10 erfolgt durch Einschnitte. Die Ebenen der Einschnitte 10 stehen in einem Winkel 30 zueinander. Die Schlitzbreite 14 dieser Einschnitte liegt vorteilhaft etwa zwischen 0,6 bis 0,7 mm. Durch diese Ausbildung des Mündungsbereichs der Sprühdüse 5 wird erreicht, dass ein Sprühstrahl 9 gebildet wird, der eine flache Querschnittsfläche und eine weitgehend homogene Verteilung der Schmiermittelkonzentration aufweist.The FIG. 4 shows two views of the mouthpiece 18: in the upper view, the mouthpiece 18 is shown in a sectional view, in the lower view in a three-dimensional view. The mouthpiece 18 is convexly curved outwards. In the present embodiment, the curvature 12 is a circular arc. A corresponding curvature is also formed on the inner wall of the mouthpiece 18. At the zenith of the curvature 12, two outlet openings 10 formed by cuts for the mixture are to be seen, which - seen in a direction opposite to the outflow direction - each have the shape of a "C". The arrangement of these two C-shaped outlet openings 10 is chosen so that the legs 25 of the two "C" from an axis of symmetry 11 point away. In other words, the two incisions "C" are back-to-back. The production of these outlet openings 10 is effected by cuts. The planes of the incisions 10 are at an angle 30 to each other. The slot width 14 of these cuts is advantageously between about 0.6 to 0.7 mm. This design of the mouth region of the spray nozzle 5 ensures that a spray jet 9 is formed which has a flat cross-sectional area and a largely homogeneous distribution of the lubricant concentration.

Die Figur 5 veranschaulicht in einer stark vereinfachten Darstellung die Schmierung im Walzspalt, wobei die obere Darstellung die Schmierung mit Emulsion gemäß Stand der Technik, die untere Darstellung, die erfindungsgemäße Aufbringung des Walzöls mittels eines Sprays darstellt. Obwohl es auch bei der Emulsionsschmierung zu einer Anlage von Schmierstoff 26 an der Oberfläche 21 der Arbeitswalze 2', 2'' und an der Oberfläche 23 des Walzbandes 8 kommt, ist aufgrund der Emulsion 20 die Schmiermittelkonzentration im Walzspalt 8 geringer als bei der Einbringung des Schmiermittels in Form eines Sprays, was in der unteren Darstellung der Figur 5 veranschaulicht ist.The FIG. 5 illustrates in a highly simplified representation of the lubrication in the nip, the upper diagram shows the lubrication with emulsion according to the state of Technique, the lower illustration represents the inventive application of the rolling oil by means of a spray. Although it comes in the emulsion lubrication to a system of lubricant 26 on the surface 21 of the work roll 2 ', 2''and on the surface 23 of the rolled strip 8, due to the emulsion 20, the lubricant concentration in the nip 8 is lower than in the introduction of the Lubricant in the form of a spray, which is shown in the lower part of the FIG. 5 is illustrated.

Dank der Erfindung bildet sich im Walzspalt 8 eine verglichen mit Emulsions-Schmierung höhere Konzentration von Schmiermittel aus. Abhängig von der Walzgeschwindigkeit, der Walzenrauheit und anderen Prozessgrößen kann ein vergleichsweise niedriger Ölverbrauch von 50 ml pro Minute bis 200 ml pro Minute pro Walzgerüst erreicht werden. Bei der Herstellung von Walzband ist dies ein erheblicher Kostenvorteil. Ein weiterer Vorteil ergibt sich durch die sehr stark verringerte Reibung im Walzspalt, wodurch die Walzkräfte und Walzmomente für den Walzprozess verringert werden können. Insbesondere beim Kaltwalzen kann eine sehr gute Oberflächenqualität des Walzbandes erzielt werden.Thanks to the invention, a higher concentration of lubricant forms in the nip 8 compared to emulsion lubrication. Depending on the rolling speed, the roll roughness and other process variables, a comparatively low oil consumption of 50 ml per minute to 200 ml per minute per rolling mill can be achieved. In the production of rolled strip this is a significant cost advantage. Another advantage results from the greatly reduced friction in the nip, whereby the rolling forces and rolling moments for the rolling process can be reduced. Especially during cold rolling, a very good surface quality of the rolled strip can be achieved.

Zusammenstellung der verwendeten BezugszeichenCompilation of the reference numbers used

11
Vorrichtung zum Aufbringen eines SchmiermittelsDevice for applying a lubricant
2', 2''2 ', 2' '
ArbeitswalzeStripper
3', 3''3 ', 3' '
Stützwalzesupporting roll
44
Zerstäubungseinrichtungatomizing
55
Sprühdüsespray nozzle
66
Leitung (Schmiermittel)Line (lubricant)
77
Leitung (Trägergas)Line (carrier gas)
88th
Walzspaltnip
99
Sprühstrahlspray
1010
Austrittsöffnungoutlet opening
1111
Symmetrieachseaxis of symmetry
1212
Krümmungcurvature
1313
Sprühbalkenspray
1414
Schlitzbreiteslot width
1515
Querschnittcross-section
1616
Förder- und AufbereitungsanlageConveying and processing plant
1717
Wannetub
1818
Mundstückmouthpiece
1919
Gesamt-SprühstrahlTotal spray
2020
Emulsionemulsion
2121
Oberfläche der ArbeitswalzenSurface of the work rolls
2222
Kühlmittelcoolant
2323
Oberfläche des WalzbandesSurface of the rolled strip
24', 24''24 ', 24' '
Achse der Arbeitswalze 2', 2''Axle of the work roll 2 ', 2' '
2525
Schenkelleg
2626
Schmiermittel, WalzölLubricant, rolling oil
2727
Trägergas, LuftCarrier gas, air
2828
Walzbandrolled strip
2929
Dosierpumpemetering
3030
Winkelangle
3131
Verwirbelungskammerswirl

Claims (19)

  1. Method for applying a lubricant during the rolling of metallic rolling stock, in particular a rolled strip (28) which is fed through a rolling aperture (8) between two working rolls (2', 2''), comprising the method steps:
    production of a mixture of lubricant and a carrier gas in an atomising device (4);
    feeding of the mixture to individual spray nozzles (5) in an arrangement of spray nozzles (5) in order to produce an overall spray jet (19) which is contiguous across the width of the rolled strip, wherein the overall spray jet (19) is made up of spray jets (9) which in cross-section are essentially flat in form;
    application of the overall spray jet (19) to the surface (21) of at least one of the working rolls and/or to the surface (23) of the rolled strip (28);
    characterised in that
    each spray jet (9) is formed by means of a spray nozzle (5) which has an orifice piece (18) with at least two discharge openings (10).
  2. Method according to claim 1, characterised in that use is made of a spherically curved orifice piece (18) with at least two discharge openings (10) which are arranged symmetrically with respect to an axis of symmetry (11).
  3. Method according to claim 2, characterised in that, in the application of the overall spray jet (19), use is made of an arrangement of spray nozzles (5) which are arranged in a row on a spray bar (13), and wherein each of the spray nozzles (9) produces a spray jet (9) which, viewed in cross-section, is essentially flat in form and wherein each of the spray jets (9) is aligned, when looking across its width, roughly parallel to the axis (24', 24'') of a working roll (2', 2'').
  4. Method according to one of claims 1 to 3, characterised in that air is used as the carrier gas.
  5. Method according to one of claims 1 to 3, characterised in that a rolling oil is used as the lubricant.
  6. Method according to claim 4 and 5, characterised in that in the production of the mixture, rolling oil and air are fed to the atomising device at a temperature which corresponds to the ambient temperature.
  7. Method according to claim 6, characterised in that the rolling oil is fed to the atomising device by means of a dosing pump (29).
  8. Method according to claim 7, characterised in that the amount of rolling oil fed is less than 200 ml per minute.
  9. Equipment for applying a lubricant into the roll aperture of a roll stand, wherein a metallic rolled strip (28) is fed through the roll aperture, incorporating:
    an atomising device (4) to which is fed the lubricant and a carrier gas in order to produce a mixture of lubricant and carrier gas;
    an arrangement of spray nozzles (5) which are connected to the atomising device (4) and to each of which the mixture is fed via connecting lines (6, 7), characterised in that each spray nozzle (5) has an orifice piece (18) with at least two discharge openings (10) which are adjusted to produce a spray jet (9) which, in cross-section, is essentially flat in form and which is directed onto the surface of a working roll (2', 2'') and/or onto the surface (23) of the rolled strip (28).
  10. Equipment according to claim 9, characterised in that the orifice piece (18) is spherically curved in the region where the at least two discharge openings (10) are formed.
  11. Equipment according to claim 10, characterised in that in the region where the curvature (12) of the orifice piece (18) is spherical, two discharge openings (10) are formed which are symmetrical with respect to an axis symmetry (11) .
  12. Equipment according to claim 11, characterised in that the two discharge openings (10) are C-shaped in form with limbs (25) which point away from the axis of symmetry (11).
  13. Equipment according to one of claims 10 to 11, characterised in that each of the discharge openings (10) has a width (14), this width (14) being less than one millimetre, preferably 0.6 to 0.7 mm.
  14. Equipment according to one of claims 9 to 13, characterised in that the arrangement of the spray nozzles (5) is chosen such that the individual spray jets (9) from the spray nozzles (5) form a contiguous overall spray jet (19) which is directed onto the surface of a working roll (2', 2'') and has a long side which is aligned roughly parallel to the axis (24', 24'') of the working roll (2', 2'').
  15. Equipment according to one of claims 9 to 13, characterised in that the lubricant is a rolling oil and the carrier gas is air.
  16. Equipment according to claim 15, characterised in that the rolling oil is fed to the atomising device (4) by means of a dosing pump (29).
  17. Equipment according to claim 16, characterised in that the dosing pump (29) feeds the rolling oil to the atomising device (4) with a volumetric flow rate of less than 200 ml per minute.
  18. Equipment according to claim 16, characterised in that the rolling oil has a temperature which corresponds roughly to the ambient temperature of the roll stand.
  19. Equipment according to claim 11, characterised in that each of the two discharge openings (10) is formed by an incision in the orifice piece (18) which lies in a plane, wherein the planes are at an angle (30) to one another.
EP11749856.8A 2010-12-16 2011-09-02 Method and apparatus for applying a lubricant while rolling metallic rolled stock Active EP2651577B1 (en)

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EP10195330A EP2465619A1 (en) 2010-12-16 2010-12-16 Method and device for applying a lubricant when milling a metallic milling product
PCT/EP2011/065165 WO2012079785A1 (en) 2010-12-16 2011-09-02 Method and apparatus for applying a lubricant while rolling metallic rolled stock
EP11749856.8A EP2651577B1 (en) 2010-12-16 2011-09-02 Method and apparatus for applying a lubricant while rolling metallic rolled stock

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EP3517228A1 (en) 2018-01-29 2019-07-31 Primetals Technologies Austria GmbH Control of a rolling process
WO2020221654A1 (en) 2019-04-30 2020-11-05 Primetals Technologies Austria GmbH Rolling of a rolled material
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WO2017186910A1 (en) 2016-04-29 2017-11-02 Primetals Technologies Austria GmbH Method for rolling a product to be rolled
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WO2021048038A1 (en) 2019-09-10 2021-03-18 Primetals Technologies Austria GmbH Cold rolling rolled stock in a mill train with multiple roll stands

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RU2013132745A (en) 2015-01-27
US20130298627A1 (en) 2013-11-14
KR20130124354A (en) 2013-11-13
EP2465619A1 (en) 2012-06-20
CN103249504A (en) 2013-08-14
RU2570257C2 (en) 2015-12-10
EP2651577A1 (en) 2013-10-23

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