EP1704000A1 - Method for lubricating milling material - Google Patents

Method for lubricating milling material

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Publication number
EP1704000A1
EP1704000A1 EP04820950A EP04820950A EP1704000A1 EP 1704000 A1 EP1704000 A1 EP 1704000A1 EP 04820950 A EP04820950 A EP 04820950A EP 04820950 A EP04820950 A EP 04820950A EP 1704000 A1 EP1704000 A1 EP 1704000A1
Authority
EP
European Patent Office
Prior art keywords
lubricant
rolling
roll
rolling stock
milling material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04820950A
Other languages
German (de)
French (fr)
Other versions
EP1704000B1 (en
Inventor
Christian Bilgen
Christoph Eichert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Classifications

    • 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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting

Definitions

  • the invention relates to a method for rolling rolled material, in particular for hot wide strip rolling in a finishing train or a casting and rolling plant, in which a lubricant is applied directly to the surface of the work rolls or indirectly to the surface of the support rolls with transfer to the surface of the work rolls before the rolling stock runs into the roll gap of a roll stand, a strongly adhering lubricating film being formed on the work roll surface, which leads to a reduction in the friction in the roll gap as an intermediate layer between the roll and the rolling stock.
  • a device for automatic oil supply to a hot rolling mill stand through which a workpiece passes.
  • the device comprises an oil spray device for the roll stand, means for supplying oil to the spray device, means for initiating the operation of the oil supply means shortly after the front end of the workpiece passes through the roll stand, and means for ending the operation of the oil supply means just before the rear end of the workpiece reaches the roll stand.
  • DE 20 22 923 discloses a method and a device for applying a lubricant to a workpiece in a hot strip rolling mill, lubricant and atomizing air being dispensed at several spray nozzles in a four-roll stand provided with two work rolls and two backup rolls.
  • the spray nozzles are arranged across the width of at least one of these support rollers.
  • the starting point for lubricant delivery is the tapping in the frame in question.
  • a disadvantage of this method or device is that a closed lubricant film must first form on the backing roll surface, which is transferred to the backing roll / work roll gap on the work roll surface. From here, the lubricant gets into the roll gap. It takes too much time (several seconds) for the lubricant to reach the rolling stock, depending on the circumferential speed of the roll and the roll diameter. In such a method or in such a device, the strip head is not supplied with fresh lubricant during threading, which leads to higher rolling forces for a short time.
  • the gripping condition - this describes the conditions at the beginning of the rolling stock - is much more critical than the pulling condition.
  • the roll gap is completely filled with rolling stock. If one of the two conditions or both conditions are not met, slippage occurs, i.e. a slip between the roll and the rolling stock.
  • the gripping angle and the rolling speed play a role. Gripping capacity decreases with increasing rolling speed.
  • the gripping angle which depends on the thickness of the incoming rolling stock, the relative reduction in thickness during rolling and the diameter of the rolls, it must always be smaller than the friction angle in order to enable slip-free rolling.
  • the gripping angle in finished streets decreases from the first to the last stand. Then the biggest gripping problems, a slipping at the beginning of the rolling stock, occur in the first finishing stand.
  • the roll gap lubrication is used in such a way that the lubrication is only switched on after tapping in the respective stand and is switched off some time before the rolling stock is unthreaded. This leaves enough work roll overruns to completely burn the lubricant on the roll surface. This will prevent gripping at the beginning of the following rolling stock from being endangered.
  • the described lubrication strategy results in two different load levels within the rolling stock, provided that the preliminary strip or thin slab runs into the finishing train with homogeneous properties over the length and without speed-up.
  • active lubrication By reducing the rolling force with active lubrication, which can be up to 50% and more, the deflection of the work rolls changes. This changes the flatness status (mainly in the rear stands) and the profile (mainly in the front stands) of the rolling stock.
  • the invention is therefore based on the object of specifying a method for applying a lubricant to a work or back-up roll surface which enables the rolling process to be improved, leads to a reduction in the wear on the rolls and lowers the energy consumption of the finishing train.
  • the decisive advantage of the method according to the invention is that there is a constant level of rolling force over the entire length of the rolling stock the respective stand results because lubrication is maintained over the entire length of the rolling stock.
  • a prerequisite for the use of the lubrication according to the invention is that the gripping conditions at the beginning of the rolling stock are ensured.
  • the application of the lubricant according to the invention in a finishing train or a casting and rolling plant is advantageously possible from the second stand and for all subsequent stands without restriction.
  • no lubricant is generally applied due to the large thickness of the rolling stock (high gripping angle).
  • the existing conditions of the respective system are taken into account. These include, for example, the condition of the roll surface after grinding, the work roll diameter, the work roll material, the incoming strip thickness, • the set relative decrease, the surface condition of the incoming rolling stock (scale, temperature, roughness, material etc.), the lubricant used, the amount of lubricant, • the rolling speed.
  • the lubricating effect at the beginning of the rolling stock is reduced by a smaller amount of lubricant or by a modified, i.e. Lubricant with other properties limited to the top.
  • Another advantage of the method according to the invention is that with constant lubrication, a constant advance is achieved, which in turn results in a constant mass flow.
  • the roll gap lubrication is used in order to have a favorable influence on the shear texture on the surface.
  • the application of the lubricant according to the invention results in a homogeneous surface texture over the entire length of the rolling stock.
  • the lubrication system provides for the construction of a ring line with feedback in the lubricant tank and the installation of a switchable 3/2 way valve in front of the mixer for the lubricant (for example a static tube mixer).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Disclosed is a method for rolling milling material, especially for hot wide-strip rolling in a finishing train or a continuous casting and rolling plant, in which a lubricant is applied directly to the surface of the working rollers or indirectly to the surface of the support rollers, the lubricant then being transferred to the surface of the working rollers, before the milling material is fed into the roller gap of a roll stand. A highly adhesive lubricant film forms on the surface of the working roller, said lubricant film resulting in a reduction of friction in the roller gap as an intermediate layer between the roller and the milling material. According to the inventive method, the lubricant is applied along the entire length of the milling material such that the lubricating effect comes into play along the entire length of the milling material.

Description

Verfahren zum Schmieren von WalzgutProcess for lubricating rolling stock
Die Erfindung betrifft ein Verfahren zum Walzen von Walzgut, insbesondere zum Warmbreitbandwalzen in einer Fertigstraße oder einer Gießwalzanlage, bei welchem ein Schmiermittel, direkt auf die Oberfläche der Arbeitswalzen o- der indirekt auf die Oberfläche der Stützwalzen mit Übertragung auf die Oberfläche der Arbeitswalzen, aufgetragen wird, bevor das Walzgut in den Walzspalt eines Walzgerüstes einläuft, wobei sich ein stark haftender Schmierfilm auf der Arbeitswalzenoberfläche bildet, welcher im Walzspalt als Zwischenschicht zwischen Walze und Walzgut zu einer Reduzierung der Reibung führt.The invention relates to a method for rolling rolled material, in particular for hot wide strip rolling in a finishing train or a casting and rolling plant, in which a lubricant is applied directly to the surface of the work rolls or indirectly to the surface of the support rolls with transfer to the surface of the work rolls before the rolling stock runs into the roll gap of a roll stand, a strongly adhering lubricating film being formed on the work roll surface, which leads to a reduction in the friction in the roll gap as an intermediate layer between the roll and the rolling stock.
Der Einsatz einer Walzspaltschmierung in hoch belasteten Fertigstraßen beim Warmwalzen ist bekannt. Dabei wird die Schmierung jedoch verzögert am Bandkopf nach dem Anstich im entspechenden Gerüst zugeschaltet und einige Zeit vor dem Ausfädeln des Bandendes wieder abgeschaltet. Eine derartige Vorgehensweise wirkt sich, je nach Schmierwirkung, nachteilig auf den Walz- prozess aus.The use of roll gap lubrication in hot rolling finishing lines in hot rolling is known. However, the lubrication is switched on with a delay at the belt head after tapping in the corresponding frame and switched off again some time before the end of the belt is unthreaded. Depending on the lubricating effect, such a procedure has an adverse effect on the rolling process.
Aus der DE 21 05 975 ist ein Gerät zur automatischen Ölzufuhr zu einem heißen Walzwerksgerüst bekannt, durch das ein Werkstück hindurchgeht. Das Gerät umfasst eine Ölsprüheinrichtung für das Walzgerüst, Mittel für die Zufuhr von Öl zu der Sprüheinrichtung, Mittel zur Einleitung des Betriebes der Ölzu- fuhrmittel kurz nachdem das vordere Ende des Werkstückes durch das Walzgerüst gelangt, und Mittel zur Beendigung des Betriebes der Ölzufuhrmittel kurz bevor das hintere Ende des Werkstückes das Walzgerüst erreicht.From DE 21 05 975 a device for automatic oil supply to a hot rolling mill stand is known, through which a workpiece passes. The device comprises an oil spray device for the roll stand, means for supplying oil to the spray device, means for initiating the operation of the oil supply means shortly after the front end of the workpiece passes through the roll stand, and means for ending the operation of the oil supply means just before the rear end of the workpiece reaches the roll stand.
In der Schrift US 6 266 985 B1 wird ein Verfahren beschrieben, wonach beim Warmwalzen die Ecken und die Enden des zu walzenden Walzgutes mit einem Schmiermittel beaufschlagt werden. Aus der DE 20 22 923 sind ein Verfahren und eine Vorrichtung zum Aufbringen eines Schmiermittels auf ein Werkstück in einem Warmbandwalzwerk bekannt, wobei in einem mit zwei Arbeitswalzen und zwei Stützwalzen versehenen Vierwalzengerüst Schmiermittel und Zerstäubungsluft an mehreren Sprühdüsen abgegeben werden. Die Sprühdüsen sind quer über die Breite wenigstens einer dieser Stützwalzen angeordnet. Sobald das Werkstück in die Arbeitswalzen einläuft, wird das Schmiermittel auf die Stützwalzen aufgebracht und von dort auf die Arbeitswalzen weitergegeben. Der Schmiermittel- und Zerstäubungsluft- strom zu den Düsen wird abgeschaltet, sobald das Werkstück die Arbeitswal- zen verlässt.A method is described in US Pat. No. 6,266,985 B1, according to which a lubricant is applied to the corners and the ends of the rolling stock to be rolled during hot rolling. DE 20 22 923 discloses a method and a device for applying a lubricant to a workpiece in a hot strip rolling mill, lubricant and atomizing air being dispensed at several spray nozzles in a four-roll stand provided with two work rolls and two backup rolls. The spray nozzles are arranged across the width of at least one of these support rollers. As soon as the workpiece runs into the work rolls, the lubricant is applied to the support rolls and passed on from there to the work rolls. The flow of lubricant and atomizing air to the nozzles is switched off as soon as the workpiece leaves the work rolls.
Startzeitpunkt für die Schmiermittelförderung ist der Anstich im betrachteten Gerüst. Nachteilig bei diesem Verfahren bzw. dieser Vorrichtung ist, dass sich zuerst ein geschlossener Schmiermittelfim auf der Stützwalzenoberfläche ausbilden muss, welcher im Spalt Stützwalze / Arbeitswalze auf die Arbeitswalzen- Oberfläche übertragen wird. Von hier aus gelangt das Schmiermittel in den Walzspalt. Bis das Schmiermittel auf das Walzgut gelangt, vergeht je nach Walzenumfangsgeschwindigkeit und Walzendurchmesser zu viel Zeit ( mehrere Sekunden ). Bei einem derartigen Verfahren bzw. bei einer derartigen Vorrichtung wird der Bandkopf beim Einfädeln nicht mit frischem Schmiermittel ver- sorgt, was kurzzeitig zu höheren Walzkräften führt.The starting point for lubricant delivery is the tapping in the frame in question. A disadvantage of this method or device is that a closed lubricant film must first form on the backing roll surface, which is transferred to the backing roll / work roll gap on the work roll surface. From here, the lubricant gets into the roll gap. It takes too much time (several seconds) for the lubricant to reach the rolling stock, depending on the circumferential speed of the roll and the roll diameter. In such a method or in such a device, the strip head is not supplied with fresh lubricant during threading, which leads to higher rolling forces for a short time.
Grundsätzlich ist ohne Reibung im Walzspalt kein Walzen möglich, da nur bei ausreichender Reibung das Walzgut erfasst und durch den Walzspalt gezogen wird. Es muss stets sichergestellt sein, dass die sogenannten Greif- und Durch- ziehbedingungen erfüllt sind.Basically, no rolling is possible without friction in the roll gap, since the rolling stock is only gripped and pulled through the roll gap if there is sufficient friction. It must always be ensured that the so-called gripping and pull-through conditions are met.
In Bezug auf eine minimal erforderliche Reibung ist die Greifbedingung - diese beschreibt die Verhältnisse am Anfang des Walzgutes - wesentlich kritischer als die Durchziehbedingung. Bei der Durchziehbedingung ist der Walzspalt komplett mit Walzgut gefüllt. Wenn eine der beiden Bedingungen oder beide Bedingungen nicht erfüllt sind, tritt Rutschen, also ein Schlupf zwischen Walze und Walzgut, auf.With regard to the minimum required friction, the gripping condition - this describes the conditions at the beginning of the rolling stock - is much more critical than the pulling condition. In the pull-through condition, the roll gap is completely filled with rolling stock. If one of the two conditions or both conditions are not met, slippage occurs, i.e. a slip between the roll and the rolling stock.
Zusätzlich zum Reibungskoeffizienten, welcher die Reibung selber beschreibt, spielen der Greifwinkel und die Walzgeschwindigkeit eine Rolle. Mit steigender Walzgeschindigkeit nimmt das Greifvermögen ab. Für den Greifwinkel, welcher abhängig ist von der Dicke des einlaufenden Walzgutes, der relativen Dickenabnahme beim Walzen und dem Durchmesser der Walzen, gilt, dass er immer kleiner als der Reibungswinkel sein muss, um ein schlupffreies Walzen zu ermöglichen. Bei üblicher Abnahmeverteilung nimmt der Greifwinkel in Fertigstra- ßen vom ersten bis zum letzten Gerüst ab. Danach treten die größten Greifprobleme, einem Rutschen am Anfang des Walzgutes, im ersten Fertiggerüst auf.In addition to the coefficient of friction, which describes the friction itself, the gripping angle and the rolling speed play a role. Gripping capacity decreases with increasing rolling speed. For the gripping angle, which depends on the thickness of the incoming rolling stock, the relative reduction in thickness during rolling and the diameter of the rolls, it must always be smaller than the friction angle in order to enable slip-free rolling. With the usual acceptance distribution, the gripping angle in finished streets decreases from the first to the last stand. Then the biggest gripping problems, a slipping at the beginning of the rolling stock, occur in the first finishing stand.
Da die Greifbedingung am Anfang des Walzgutes schwieriger zu erfüllen ist als die Durchziehbedingungen im Walzgut, wird die Walzspaltschmierung so eingesetzt, das erst nach Anstich im jeweiligen Gerüst die Schmierung zugeschaltet wird und einige Zeit vor dem Ausfädeln des Walzgutes ausgeschaltet wird. Auf diese Weise verbleiben genügend Arbeitswalzenüberrollungen, um das auf der Walzenoberfläche befindliche Schmiermittel vollständig zu verbrennen. Damit wird vermeiden, dass das Greifen am Anfang des nachfolgenden Walzgutes gefährdet wird.Since the gripping condition at the beginning of the rolling stock is more difficult to fulfill than the pull-through conditions in the rolling stock, the roll gap lubrication is used in such a way that the lubrication is only switched on after tapping in the respective stand and is switched off some time before the rolling stock is unthreaded. This leaves enough work roll overruns to completely burn the lubricant on the roll surface. This will prevent gripping at the beginning of the following rolling stock from being endangered.
Durch die beschriebene Schmierstrategie ergeben sich innerhalb des Walzgutes zwei unterschiedliche Lastniveaus, wobei vorausgesetzt ist, dass das Vor- band bzw. die Dünnbramme mit homogenen Eigenschaften über die Länge und ohne Speed - Up in die Fertigstraße einläuft.The described lubrication strategy results in two different load levels within the rolling stock, provided that the preliminary strip or thin slab runs into the finishing train with homogeneous properties over the length and without speed-up.
Ein hohes Lastniveau am Anfang und am Ende des Walzgutes ( ohne Schmierwirkung ) und ein niedriges Walzkraftniveau im übrigen Bereich des Walzgutes ( Schmierung aktiv ). Durch die Verringerung der Walzkraft bei aktiver Schmierung, die bis zu 50% und mehr betragen kann, ändert sich die Durchbiegung der Arbeitswalzen. Damit ändern sich gleichzeitig Planheitszustand ( maßgeblich in den hintern Gerüsten ) und Profil ( maßgeblich in den vorderen Gerüsten ) des Walzgutes.A high load level at the beginning and end of the rolling stock (without lubrication) and a low rolling force level in the rest of the rolling stock (active lubrication). By reducing the rolling force with active lubrication, which can be up to 50% and more, the deflection of the work rolls changes. This changes the flatness status (mainly in the rear stands) and the profile (mainly in the front stands) of the rolling stock.
Steht eine Arbeitswalzenbiegung als Stellglied im jeweiligen Gerüst zur Verfügung, werden bei großen Walzkraftreduktionen dennoch die Stellgrenzen häufiger erreicht. Ein instabilerer Lauf des Walzgutes, besonders bei Dünnbandwalzungen, ist die Folge.If a work roll bend is available as an actuator in the respective stand, the setting limits are still reached more often with large rolling force reductions. The result is a more unstable run of the rolling stock, especially in the case of thin strip rolling.
Es ist üblich, die Walzkraftreduktion auf einen Wert von ca. 20% zu begrenzen.It is common to limit the reduction in rolling force to a value of approximately 20%.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Aufbringen eines Schmiermittels auf eine Arbeits- oder Stützwalzenoberfläche anzugeben, welches eine Verbesserung des Walzprozesses ermöglicht, zu einer Verringe- rung am Verschleiss der Walzen führt und den Energieverbauch der Fertigstraße senkt.The invention is therefore based on the object of specifying a method for applying a lubricant to a work or back-up roll surface which enables the rolling process to be improved, leads to a reduction in the wear on the rolls and lowers the energy consumption of the finishing train.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by the characterizing features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.
Wird ein Schmiersystem, welches das Schmiermittel aus einem Vorratsbehälter über Leitungen und Düsen zu den Arbeits- bzw. Stützwalzen fördert, bereits 5 bis 15 sec. vor Einlauf des Walzguts in das Walzgerüst zugeschaltet, so werden alle Totzeiten im Schmiersystem kompensiert, so dass sich auf jeden Fall bereits vor dem Anstich ein geschlossener Schmierfilm auf der Arbeitswalze ausgebildet hat.If a lubrication system that conveys the lubricant from a storage container via lines and nozzles to the work or back-up rolls is switched on 5 to 15 seconds before the rolling stock enters the roll stand, all dead times in the lubrication system are compensated for, so that has already formed a closed lubricating film on the work roll before tapping.
Der entscheidende Vorteil des erfindungsgemäßen Verfahrens liegt darin, dass sich über die gesamte Länge des Walzgutes ein konstantes Walzkraftniveau für das jeweilige Gerüst ergibt, weil eine Schmierung über die gesamte Länge des Walzguts aufrechterhalten wird.The decisive advantage of the method according to the invention is that there is a constant level of rolling force over the entire length of the rolling stock the respective stand results because lubrication is maintained over the entire length of the rolling stock.
Aufgrund der Walzkraftkonstanz lassen sich insgesamt höhere Walzkraftreduktionen, beispielsweise von 40 bis 50 %, erzielen, wodurch die Belastung der Walzstraße im Hinblick auf Verschleiß und Energieverbrauch deutlich verringert wird. Weiterhin wird durch die höhere Walzkraftreduktion auch der Arbeitswalzenverschleiß gesenkt und damit die Walzeneinliegezeit ( Standzeit ) verlängert.Due to the constant rolling force, higher rolling force reductions, for example of 40 to 50%, can be achieved, which significantly reduces the load on the rolling mill with regard to wear and energy consumption. Furthermore, the higher roll force reduction also reduces work roll wear and thus extends the roll lay-in time (service life).
Die Vorteile des erfindungsgemäßen Verfahrens sind somit:The advantages of the method according to the invention are therefore:
• konstantes Walzkraftniveau;• constant rolling force level;
• keine mit der Walzkraft zusammenhängende Änderung des Planheits- zustandes; • keine mit der Walzkraft zusammenhängende Änderung des Bandprofiles,• no change in the flatness condition associated with the rolling force; • no change in the strip profile associated with the rolling force,
• da auch die Kräfte am Anfang und am Ende des Walzgutes deutlich reduziert werden, können Gerüstvibrationen und Walzenschäden noch effektiver vermieden werden;• since the forces at the beginning and end of the rolling stock are also significantly reduced, stand vibrations and roller damage can be avoided even more effectively;
• daraus ergibt sich mehr Spielraum für Abnahmeumverteilungen und da- mit ergeben sich optimierte Stichpläne beim Walzen kritischer Produkte;• this gives more scope for acceptance redistribution and thus results in optimized pass schedules when rolling critical products;
• da sich der Planheitszustand am Ende des Walzgutes aufgrund der Walzkraft nicht ändert, kann ein Verwalzen des Anfangs des Walzgutes vermieden werden.• Since the flatness state does not change at the end of the rolling stock due to the rolling force, rolling of the beginning of the rolling stock can be avoided.
Voraussetzung für die Anwendung der erfindungsgemäßen Schmierung ist, dass die Greifbedingungen am Anfang des Walzgutes sichergestellt sind.A prerequisite for the use of the lubrication according to the invention is that the gripping conditions at the beginning of the rolling stock are ensured.
Das erfindungsgemäße Aufbringen des Schmiermittels in einer Fertigstraße oder einer Gießwalzanlage ist vorteilhaft ab dem zweiten Gerüst und für alle Folgegerüste ohne Einschränkung möglich. Im ersten Fertiggerüst wird aufgrund der großen Dicke des Walzgutes ( hoher Greifwinkel ) im allgemeinen kein Schmiermittel aufgebracht. Um das Schmiermittel erfindungsgemäß bereits im zweiten Fertiggerüst aufzubringen, werden die vorliegenden Verhältnisse der jeweiligen Anlage berücksichtigt. Hierzu ge- hören beispielsweise der Zustand der Walzenoberfläche nach dem Schleifen, der Arbeitswalzendurchmesser, das Arbeitswalzenmaterial, die einlaufende Banddicke, • die eingestellte relative Abnahme, der Oberflächenzustand des einlaufenden Walzgutes ( Zunder, Temperatur, Rauheit, Material etc.), das eingesetzte Schmiermittel, die Schmiermittelmenge, • die Walzgeschwindigkeit.The application of the lubricant according to the invention in a finishing train or a casting and rolling plant is advantageously possible from the second stand and for all subsequent stands without restriction. In the first finishing stand, no lubricant is generally applied due to the large thickness of the rolling stock (high gripping angle). In order to apply the lubricant according to the invention already in the second finishing stand, the existing conditions of the respective system are taken into account. These include, for example, the condition of the roll surface after grinding, the work roll diameter, the work roll material, the incoming strip thickness, • the set relative decrease, the surface condition of the incoming rolling stock (scale, temperature, roughness, material etc.), the lubricant used, the amount of lubricant, • the rolling speed.
Liegt der Greifwinkel im kritischen Bereich, wird am Anfang des Walzgutes die Schmierwirkung durch eine geringere Menge an Schmiermittel bzw. durch ein modifiziertes, d.h. andere Eigenschaften aufweisendes Schmiermittel nach o- ben hin begrenzt.If the gripping angle is in the critical range, the lubricating effect at the beginning of the rolling stock is reduced by a smaller amount of lubricant or by a modified, i.e. Lubricant with other properties limited to the top.
Bei Anwendung des erfindungsgemäßen Verfahrens zum Auftragen des Schmiermittels auf eine Walzenoberfläche empfiehlt es sich, das Stichplanmodell der Fertigstraße für diesen Betrieb vorzubereiten. Dabei sollte zumindest eine Doppelung der Adaptionsmatrix vorgesehen werden, um den ausadaptierten Betrieb ohne Walzspaltschmierung nicht zu beeinträchtigen. Bei physikalischen Modellen ist die Vorgabe unterschiedlicher Sätze von Reibungskoeffizienten - für geschmierten und ungeschmierten Zustand - für die Inbetriebnahme sowie bei der Einführung neuer Produkte und zur Vermeidung hoher Adaptionswerte von großem Vorteil. Jede Reibungsänderung ist mit einer Änderung der Voreilung, d.h. mit einer Massenflussänderung bzw. - Störung verbunden. Eine derartige Störung muss von den Regelsystemen ausgeregelt werden, was bei kritischen Dünnbandwalzungen zu erheblichen Schwierigkeiten führen kann.When using the method according to the invention for applying the lubricant to a roller surface, it is advisable to prepare the pass schedule model of the finishing train for this operation. At least one duplication of the adaptation matrix should be provided in order not to impair the fully adapted operation without roll gap lubrication. With physical models, the specification of different sets of friction coefficients - for lubricated and unlubricated condition - for commissioning and when introducing new products and to avoid high adaptation values is of great advantage. Every change in friction is associated with a change in the lead, ie with a change or disturbance in the mass flow. Such a disturbance must be corrected by the control systems, which can lead to considerable difficulties with critical thin strip rolling.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, dass bei einer konstanten Schmierung eine konstante Voreilung erzielt wird, welche wiederum einen konstanten Massenfluss zur Folge hat.Another advantage of the method according to the invention is that with constant lubrication, a constant advance is achieved, which in turn results in a constant mass flow.
Beim ferritischen Walzen wird die Walzspaltschmierung eingesetzt, um die Schertextur an der Oberfläche günstig zu beeinflussen. Das erfindungsgemäße Auftragen des Schmiermittels bewirkt eine homogene Oberflächentextur über die gesamte Walzgutlänge.In the case of ferritic rolling, the roll gap lubrication is used in order to have a favorable influence on the shear texture on the surface. The application of the lubricant according to the invention results in a homogeneous surface texture over the entire length of the rolling stock.
Bei dem Schmiersystem ist zur Vermeidung von Verzögerungszeiten beim Einschalten der Schmierung der Aufbau einer Ringleitung mit Rückführung in den Schmiermitteltank und ein Einbau eines schaltbaren 3/2 Wege - Ventils vor dem Mischer für das Schmiermittel ( beispielsweise einem Static - Tube Mixer ) vorgesehen. In order to avoid delay times when switching on the lubrication, the lubrication system provides for the construction of a ring line with feedback in the lubricant tank and the installation of a switchable 3/2 way valve in front of the mixer for the lubricant (for example a static tube mixer).

Claims

Patentansprüche claims
1 . Verfahren zum Walzen von Walzgut, insbesondere zum Warmbreitbandwalzen in einer Fertigstraße oder einer Gießwalzanlage, bei welchem ein Schmiermittel, direkt auf die Oberfläche der Arbeitswalzen oder indirekt auf die Oberfläche der Stützwalzen mit Übertragung auf die Oberfläche der Arbeitswalzen, aufgetragen wird, bevor das Walzgut in den Walzspalt eines Walzgerüstes ein- läuft, wobei sich ein stark haftender Schmierfilm auf der Arbeitswalzenoberfläche bildet, welcher im Walzspalt als Zwischenschicht zwischen Walze und Walzgut zu einer Reduzierung der Reibung führt, dadurch gekennzeichnet, dass das Schmiermittel über die gesamte Länge des Walzguts aufgetragen wird und die Schmierwirkung daher über der gesamten Walzgutlänge aktiv ist.1 . Process for rolling rolled material, in particular for hot wide strip rolling in a finishing train or a casting and rolling plant, in which a lubricant is applied directly to the surface of the work rolls or indirectly to the surface of the support rolls with transfer to the surface of the work rolls, before the rolled goods are transferred to the Roll gap of a roll stand comes in, whereby a strongly adhering lubricating film forms on the work roll surface, which leads to a reduction in friction in the roll gap as an intermediate layer between the roll and the rolling stock, characterized in that the lubricant is applied over the entire length of the rolling stock and the Lubrication effect is therefore active over the entire length of the rolling stock.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass ein Schmiersystem, welches das Schmiermittel aus einem Vorratsbehälter über Leitungen und Düsen zu den Arbeits- bzw. Stützwalzen fördert, 5 bis 15 sec. vor Einlauf des Walzguts in das Walzgerüst zugeschaltet wird.2. The method according to claim 1, characterized in that a lubrication system, which conveys the lubricant from a reservoir via lines and nozzles to the work or backup rolls, is switched on 5 to 15 seconds before the rolling stock enters the roll stand.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Schmiermittel in dem zweiten und in jedem der nachfolgenden Gerüste aufgetragen wird. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Schmiermittel in dem dritten und in jedem der nachfolgenden Gerüste aufgetragen wird.3. The method according to claim 1, characterized in that the lubricant is applied in the second and in each of the subsequent stands. A method according to claim 1, characterized in that the lubricant is applied in the third and in each of the subsequent stands.
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Schmiermittel in dem zweiten und in jedem beliebigen der nachfolgenden Gerüste aufgetragen wird.A method according to claim 1, characterized in that the lubricant is applied in the second and in any of the subsequent stands.
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Schmiermittel in dem dritten und in jedem beliebigen der nachfolgenden Gerüste aufgetragen wird. A method according to claim 1, characterized in that the lubricant is applied in the third and in any of the subsequent stands.
EP04820950A 2003-12-23 2004-11-30 Method for lubricating milling material Revoked EP1704000B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10361493 2003-12-23
DE102004006130A DE102004006130A1 (en) 2003-12-23 2004-02-07 Method for rolling milling material, especially useful for hot wide strip rolling in a finishing train or a continuous casting and rolling plant and giving decreased roll wear and decreased energy consumption
PCT/EP2004/013571 WO2005065854A1 (en) 2003-12-23 2004-11-30 Method for lubricating milling material

Publications (2)

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EP1704000A1 true EP1704000A1 (en) 2006-09-27
EP1704000B1 EP1704000B1 (en) 2008-01-02

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EP04820950A Revoked EP1704000B1 (en) 2003-12-23 2004-11-30 Method for lubricating milling material

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US (1) US20090038356A1 (en)
EP (1) EP1704000B1 (en)
JP (1) JP2007515297A (en)
KR (1) KR101140808B1 (en)
CN (1) CN1898038B (en)
AR (1) AR047573A1 (en)
AT (1) ATE382440T1 (en)
AU (1) AU2004311509A1 (en)
BR (1) BRPI0417850A (en)
CA (1) CA2547960A1 (en)
DE (2) DE102004006130A1 (en)
EG (1) EG24296A (en)
ES (1) ES2295981T3 (en)
RU (1) RU2364454C2 (en)
TW (1) TW200533432A (en)
WO (1) WO2005065854A1 (en)
ZA (1) ZA200601118B (en)

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DE102007042898A1 (en) 2007-06-08 2008-12-11 Sms Demag Ag Method and device for roller lubrication
EP3517228A1 (en) 2018-01-29 2019-07-31 Primetals Technologies Austria GmbH Control of a rolling process
CN109332769A (en) 2018-11-22 2019-02-15 青岛理工大学 Milling system and method under different lubricating conditions

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US20090038356A1 (en) 2009-02-12
CN1898038B (en) 2011-03-09
DE102004006130A1 (en) 2005-07-28
EP1704000B1 (en) 2008-01-02
ZA200601118B (en) 2007-03-28
CA2547960A1 (en) 2005-07-21
BRPI0417850A (en) 2007-04-27
RU2364454C2 (en) 2009-08-20
AU2004311509A1 (en) 2005-07-21
KR20060113667A (en) 2006-11-02
ES2295981T3 (en) 2008-04-16
EG24296A (en) 2009-01-11
DE502004005872D1 (en) 2008-02-14
KR101140808B1 (en) 2012-05-03
JP2007515297A (en) 2007-06-14
ATE382440T1 (en) 2008-01-15
WO2005065854A1 (en) 2005-07-21
TW200533432A (en) 2005-10-16
CN1898038A (en) 2007-01-17
AR047573A1 (en) 2006-01-25
RU2006108529A (en) 2006-07-10

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