EP1682288A2 - Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips - Google Patents

Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips

Info

Publication number
EP1682288A2
EP1682288A2 EP04764552A EP04764552A EP1682288A2 EP 1682288 A2 EP1682288 A2 EP 1682288A2 EP 04764552 A EP04764552 A EP 04764552A EP 04764552 A EP04764552 A EP 04764552A EP 1682288 A2 EP1682288 A2 EP 1682288A2
Authority
EP
European Patent Office
Prior art keywords
strip
edges
edge
belt
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.)
Granted
Application number
EP04764552A
Other languages
German (de)
French (fr)
Other versions
EP1682288B1 (en
Inventor
Hans-Peter Richter
Hartmut Pawelski
Ludwig Weingarten
Thorsten Bode
Jürgen Klöckner
Ralf Ohrndorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1682288A2 publication Critical patent/EP1682288A2/en
Application granted granted Critical
Publication of EP1682288B1 publication Critical patent/EP1682288B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • 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
    • B21B1/40—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 foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • 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
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • 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
    • B21B27/02—Shape or construction of 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
    • B21B27/106—Heating the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements
    • 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

Definitions

  • the invention relates to a method for applying a controllable tension distribution, in particular in the edge areas during cold rolling of metal strips, in order to reduce the risk of excessive tensile build-up and strip edge cracks with the disadvantageous consequence of production-reducing strip cracks, and to improve the strip surface and its flatness even at relatively higher levels Belt travel speed and to reduce belt trimming widths.
  • the invention also relates to an apparatus for performing the method.
  • a method is known from document EP 0 054 172 A2 in which the friction coefficient between the strip surfaces and the roll surface of the roll surface is influenced by the application of rolling lubricant for the tension-free rolling of cold strip. This is applied as a function of the partial tensile stresses determined behind the last frame in the transverse direction of the belt.
  • Base oil is applied to the rolling lubricant directly on the strip surfaces in quantities determined by the partial tensile stresses determined and in localized areas before the strip enters the roll gap.
  • the aim of this measure is to apply the lubricating components locally to strips of the strip to be rolled in order to reduce the rolling force there due to the locally improved lubrication and thus also to reduce the local flattening of the roll. Furthermore, the frictional heat introduced into the roller is reduced at these points.
  • a method and a device are known from document EP 0 367 967 B1 in which the concentration of an emulsion of rolling oil is influenced in a targeted manner and the emulsion or dispersion after it has left the roll gap or Drain in front of the roll gap and is separated again.
  • This makes it possible to produce the emulsion or dispersion that is introduced into the roll gap again and again with a certain concentration in good time before it is drawn into the roll gap.
  • the focus of this invention lies in the current production of the emulsion and the separation of the media involved.
  • Document EP 1 188 494 A1 describes a strip wiping device, strip wiping method, roll stand and rolling process. To improve the productivity of a cold rolling device, this was provided with a belt scraper.
  • Document EP 0 672 471 B1 discloses a method and an apparatus for rolling strips.
  • Low-wear rollers with rollers with enlarged radii in at least one of their end regions are displaced relative to one another in such a way that the width of the rolled strip is in contact with regions of the smaller radius, and that with increasing heating and with thermal crowning by displacement in opposite directions areas of their larger radius are pushed over edge areas of the rolled strip. It is thereby achieved that the edge region excesses of the band, which would occur due to the increasing thermal crowning, are eliminated.
  • Document DE 199 08 743 A1 discloses a method and a device for drying and keeping dry, in particular, cold strip in the outlet area of cold rolling and strip systems.
  • a contactless seal between the partition and the band is proposed by means of an air cushion-like compressed gas cushion and a gap flow in order to apply compressed gas from a large number of blowing nozzles from blowing nozzle strips to the band surfaces at right angles from above and below.
  • Document DE 101 31 369 A1 discloses a method and a device for cooling and / or lubricating rolls, in particular the work rolls of a roll stand and a rolled strip rolled and conveyed between these rolls, using water in the form of spray jets as cooling medium and spray oil, Oil-air mixture or oil-water mixture, as a lubricant.
  • a combined use of subcooling of the strip and roller surface and roller lubrication on the scraper inlet side is proposed, in that the two media - water and lubricant - are fed separately to the rollers or the rolled strip and to different roller application points - Surface to be applied.
  • the invention in cold rolling, in particular in the aluminum industry, but in some cases also in the steel and non-ferrous metal sector, is based on the task of minimizing the tight strip edges and long strip fibers that occur near the edges and reducing strip tears To save trimmings and thereby improve the quality and quantity of the application.
  • the risk of tape breakage due to tape edge tears is demonstrably reduced and the tape surface is additionally improved.
  • An embodiment of the method according to claim 1 provides that an increased decrease in diameter of the work rolls at the edge region as a result of partial increase in diameter during their shaping is carried out by means of inductive heating.
  • a device for applying a controllable tension distribution, in particular in edge areas when cold rolling metal strips preferably for carrying out the method according to the invention, is characterized by spray nozzle arrangements in at least two separate zones with connections to separate spraying agent feeds to different zones of each work roll and / or by one Special sanding with increased diameter at the end areas of work rolls for the purpose of lengthening the strip edges to be rolled while simultaneously reducing tensile stresses and reducing long strip fibers in areas of the strip edges near the edges.
  • a further embodiment of the device advantageously includes a swivel castor which is convexly bendable or curved in the strip running direction in an arrangement between two guide rollers for changing the tension distribution of a strip before it enters a roll stand.
  • the device is also designed in such a way that it has means for direct additive application, in particular onto the rolled strip, for example, on the inlet side of a roll stand.
  • B. for lubricating oil with a relatively high viscosity and on the outlet side of the work rolls means for bale cooling of the work rolls and preferably additional means for lubricant removal, which preferably spray the rolled strip from both the top and the underside of the strip with the assignable spray media.
  • the device according to the invention has a device which removes coolant in the outlet side of the frame.
  • Figure 1 shows a device for "hot edge spray" on the roller edge
  • Figure 2 shows a special grinding for work rolls
  • Figure 4 The top view of the swivel castor acc. Fig. 3
  • FIG. 5 A side view of a system according to the invention with direct application of lubricant to the rolled strip, roller cooling on the outlet side and removal of lubricant.
  • FIG. 1 shows part of a device for applying a controllable tension distribution, in particular in edge areas during cold rolling of metal strips, with spray nozzle arrangements 11, 11 'present in at least two separate zones 10, 10' with connections to separate spray agent feeds 19, 19 'to different zones 10 , 10 'of each work roll 12.
  • spray nozzle arrangements 11, 11 ' present in at least two separate zones 10, 10' with connections to separate spray agent feeds 19, 19 'to different zones 10 , 10 'of each work roll 12.
  • FIG. 2 shows a pair of work rolls 12, 12 ', each of which has a special grinding 13, 13' in one end area with enlarged diameters in the end areas in order to lengthen the strip edges to be rolled while simultaneously reducing tensile stresses and reducing long strip fibers.
  • Figure 5 shows a side view of a system according to the invention, with a decoiler on the left side and a decoiler on the right side as well as guide means for the rolled strip 16 in the strip running direction 14 and means 21 for direct application of lubricant with viscosity or additive on the strip entry side and Means 22 for cooling the bale of the work rolls on the outlet side and with means 23 for removing lubricant on the outlet side.
  • a material build-up on the belt edge during the preliminary stitches and, accordingly, a material breakdown on the belt edge during the finish stitches is achieved with the aid of an additive direct application on the inlet side and roller cooling on the outlet side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention relates to a method and a device for applying an adjustable tensile-stress distribution, in particular in the edge regions during the cold-rolling of metal strips ( 16 ), in particular metal foil, in order to reduce the risk of an excessive build-up of tension and cracks at the edges of the strip, which can lead as a negative consequence to cracks in the strip and to a reduction in production, and in order to improve the surface of the strip and its planarity, even for a relatively high strip displacement speed, and also to reduce strip trimming widths. To achieve these aims, at least one or a combination of two of the following measures are implemented: a) separation of lubrication and cooling of the working rolls by lubricating on the run-in side and cooling on the discharge side, b) additional influencing of the strip edges using a hot edge spray", in particular by spraying ( 21 ) rolling oil with differing temperatures in zones, c) use of a special cross-sectional configuration of the working rolls ( 12, 12 ') in the vicinity of the strip edges, which creates a partial material build-up during the blooming pass, said build-up forming a longer strip edge with subsequent passes, thus counteracting the risk of an excessive build-up of tensile stress.

Description

Verfahren und Vorrichtung zum Aufbringen einer regelbaren Zugspannungsverteilung, insbesondere in den Kantenbereichen kaltgewalzter MetallbänderMethod and device for applying an adjustable tension distribution, in particular in the edge areas of cold-rolled metal strips
Die Erfindung betrifft ein Verfahren zum Aufbringen einer regelbaren Zugspannungsverteilung, insbesondere in den Kantenbereichen beim Kaltwalzen von Metallbändern, zwecks Verringerung der Gefahr eines zu hohen Zugaufbaus und Bandkantenrissen mit der nachteiligen Folge von produktionsmindemden Bandrissen, sowie zur Verbesserung der Bandoberfläche und ihrer Planheit auch bei relativ höherer Bandlaufgeschwindigkeit und zur Reduzierung von Bandbesäumbreiten. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for applying a controllable tension distribution, in particular in the edge areas during cold rolling of metal strips, in order to reduce the risk of excessive tensile build-up and strip edge cracks with the disadvantageous consequence of production-reducing strip cracks, and to improve the strip surface and its flatness even at relatively higher levels Belt travel speed and to reduce belt trimming widths. The invention also relates to an apparatus for performing the method.
Aus dem Dokument EP 0 054 172 A2 ist ein Verfahren bekannt, bei dem zum spannungsfreien Walzen von Kaltband der Reibwert zwischen den Bandoberflächen und den Walzenballen-Mantelflächen durch Beaufschlagung mit Walzschmiermittel beeinflusst wird. Diese wird dabei in Abhängigkeit von hinter dem letzten Gerüst in Querrichtung des Bandes liegenden Zonen ermittelten partiellen Zugspannungen zugeführt. Dabei wird Grundöl dem Walzschmiermittel vor dem Einlauf des Bandes in den Walzspalt in durch die ermittelten partiellen Zugspannungen bestimmten Mengen und in örtlich begrenzten Bereichen unmittelbar auf die Bandoberflächen aufgetragen. Ziel dieser Maßnahme ist es, die Schmierbestandteile lokal auf Streifen des zu walzenden Bandes aufzubringen, um durch die lokal verbesserte Schmierung die dortige Walzkraft zu senken und damit auch die lokale Abplattung der Walze zu verringern. Weiterhin wird die in die Walze eingebrachte Reibungswärme an diesen Stellen reduziert.A method is known from document EP 0 054 172 A2 in which the friction coefficient between the strip surfaces and the roll surface of the roll surface is influenced by the application of rolling lubricant for the tension-free rolling of cold strip. This is applied as a function of the partial tensile stresses determined behind the last frame in the transverse direction of the belt. Base oil is applied to the rolling lubricant directly on the strip surfaces in quantities determined by the partial tensile stresses determined and in localized areas before the strip enters the roll gap. The aim of this measure is to apply the lubricating components locally to strips of the strip to be rolled in order to reduce the rolling force there due to the locally improved lubrication and thus also to reduce the local flattening of the roll. Furthermore, the frictional heat introduced into the roller is reduced at these points.
Aus dem Dokument EP 0 367 967 B1 ist ein Verfahren und eine Vorrichtung bekannt, bei der die Konzentration einer Emulsion aus Walzöl gezielt beeinflusst und die Emulsion bzw. Dispersion nach Austritt aus dem Walzspalt bzw. Ablauf vor dem Walzspalt aufgefangen und wieder getrennt wird. Hiermit wird es möglich, die Emulsion bzw. Dispersion, die in den Walzspalt eingebracht wird, immer wieder mit bestimmter Konzentration zeitgerecht vor Einzug in den Walzspalt herzustellen. Der Schwerpunkt dieser Erfindung liegt in der aktuellen Herstellung der Emulsion und der Trennung der beteiligten Medien.A method and a device are known from document EP 0 367 967 B1 in which the concentration of an emulsion of rolling oil is influenced in a targeted manner and the emulsion or dispersion after it has left the roll gap or Drain in front of the roll gap and is separated again. This makes it possible to produce the emulsion or dispersion that is introduced into the roll gap again and again with a certain concentration in good time before it is drawn into the roll gap. The focus of this invention lies in the current production of the emulsion and the separation of the media involved.
Das Dokument EP 1 188 494 A1 beschreibt eine Bandabstreifvorrichtung, Bandabstreifmethode, Walzgerüst und Walzverfahren. Zur Verbesserung der Produktivität einer Kaltwalzeinrichtung wurde diese mit einem Bandabstreifer versehen.Document EP 1 188 494 A1 describes a strip wiping device, strip wiping method, roll stand and rolling process. To improve the productivity of a cold rolling device, this was provided with a belt scraper.
Beim Hochgeschwindigkeitswalzen von mehr als 700 m/min, welches mit konventionellen Abstreiferrollen oder Rohr-Abstreifer nicht ausführbar war, wurde die Produktivität der Kaltwalzeinrichtung und die Oberflächenqualität eines Bandes durch Hinzufügen der Abstreifvorrichtung wesentlich verbessert.With high-speed rolling of more than 700 m / min, which could not be carried out with conventional stripper rollers or pipe strippers, the productivity of the cold rolling device and the surface quality of a strip were significantly improved by adding the stripping device.
Das Dokument EP 0 672 471 B1 offenbart ein Verfahren und eine Vorrichtung zum Walzen von Bändern. Als Walzen werden verschleißarme, mit mindestens in einem ihrer Endbereiche mit vergrößerten Radien ausgeführte Walzen derart gegeneinander verschoben, dass das Walzband in seiner Breite jeweils mit Be- reichen des geringeren Radius in Kontakt stehen, und dass mit zunehmender Erwärmung und mit thermischer Bombierung durch gegensinniges Verschieben der Walzen Bereiche ihres größeren Radius über Randbereiche des Walzbandes geschoben werden. Dadurch wird erreicht, dass die Randbereich- Überhöhungen des Bandes, die durch die steigende thermische Bombierung eintreten würden, beseitigt werden.Document EP 0 672 471 B1 discloses a method and an apparatus for rolling strips. Low-wear rollers with rollers with enlarged radii in at least one of their end regions are displaced relative to one another in such a way that the width of the rolled strip is in contact with regions of the smaller radius, and that with increasing heating and with thermal crowning by displacement in opposite directions areas of their larger radius are pushed over edge areas of the rolled strip. It is thereby achieved that the edge region excesses of the band, which would occur due to the increasing thermal crowning, are eliminated.
Das Dokument DE 199 08 743 A1 offenbart ein Verfahren und eine Vorrichtung zum Trocknen und Trockenhalten von insbesondere Kaltband im Auslaufbereich von Kaltwalz- und Bandanlagen. Bei der Trocknung und dem Trockenhal- ten insbesondere von gewalzten Bändern ist es bekannt, durch eine Abschottung den Trockenbereich des fertiggewalzten Bandes vom Feuchtraum des Walzgerüstes zu trennen. Hierzu wird eine berührungslose Abdichtung zwischen der Abschottung und dem Band durch ein luftkissenähnliches Druckgaspolster sowie eine Spaltströmung vorgeschlagen, um so Druckgas aus einer Vielzahl von Blasdüsen aus Blasdüsenleisten im rechten Winkel von oben und unten auf die Bandoberflächen aufzubringen. Durch diese Maßnahme wird auch bei hohen Bandgeschwindigkeiten über 1000 m/min unabhängig von der Bandbreite eine Durchdringung von Walzöl oder auch Emulsion mit Erfolg verhindert und eine berührungslose Bandtrocknung erreicht.Document DE 199 08 743 A1 discloses a method and a device for drying and keeping dry, in particular, cold strip in the outlet area of cold rolling and strip systems. When drying and keeping dry, in particular, rolled strips, it is known to separate the dry area of the finished strip from the damp room of the To separate the roll stand. For this purpose, a contactless seal between the partition and the band is proposed by means of an air cushion-like compressed gas cushion and a gap flow in order to apply compressed gas from a large number of blowing nozzles from blowing nozzle strips to the band surfaces at right angles from above and below. This measure successfully prevents the penetration of rolling oil or emulsion, even at high strip speeds of over 1000 m / min, and achieves non-contact strip drying.
Das Dokument DE 101 31 369 A1 offenbart ein Verfahren und eine Vorrichtung zum Kühlen und / oder Schmieren von Walzen, insbesondere der Arbeitswalzen eines Walzgerüstes und eines zwischen diesen Walzen gewalzten und hindurch geförderten Walzbandes unter Verwendung von Wasser in Form von Sprühstrahlen als Kühlmedium und Sprühöl, Öl-Luft-Gemisch oder Öl-Wasser- Gemisch, als Schmiermittel. Zur Verbesserung der Schmier- und Kühlwirkung wird ein kombinierter Einsatz von Unterkühlung der Band- und Walzenoberfläche sowie der Walzenschmierung auf der Gerüsteinlaufseite vorgeschlagen, indem die beiden Medien - Wasser bzw. Schmiermittel - den Walzen bzw. dem Walzband getrennt zugeführt und an unterschiedliche Auftragsstellen der Walz- Oberfläche aufgetragen werden. Für Wasser bzw. Schmiermittel sind jeweils separate Vorratsbehälter sowie getrennte Zuführungen zu den Sprühbalken für Wasser und zu den Sprühbalken für das Schmiermittel vorgesehen. Mit großem Vorteil ergibt sich hieraus eine optimale Nutzung von jeweils Schmier- oder Kühlwirkung der beiden Medien Wasser und Schmiermittel und damit zugleich eine Senkung des Kraft- und Arbeitsbedarfes, bedingt durch minimierte Reibwerte an den Walzen. Die geschliffene Oberfläche der Walze hält selbst bei höchsten Beanspruchungen stand. Die bisher beobachteten Materialabschä- lungen an den Walzen werden unterbunden. Die Oberfläche des gewalzten Bandes bleibt optimal glatt, Zundereinschlüsse und Rattermarken auf der Bandoberfläche sind eliminiert. Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung im Kaltwalzbereich, insbesondere in der Aluminium-Industrie, fallweise aber auch im Stahlbereich und NE-Metall-Bereich die Aufgabe zugrunde, die beim Dünnwalzen entstehenden strammen Bandkanten und randnahen langen Bandfasern zu minimieren, Bandrisse zu reduzieren, Besäumungen einzusparen und dadurch Qualität sowie Quantität im Ausbringen zu verbessern.Document DE 101 31 369 A1 discloses a method and a device for cooling and / or lubricating rolls, in particular the work rolls of a roll stand and a rolled strip rolled and conveyed between these rolls, using water in the form of spray jets as cooling medium and spray oil, Oil-air mixture or oil-water mixture, as a lubricant. In order to improve the lubrication and cooling effect, a combined use of subcooling of the strip and roller surface and roller lubrication on the scraper inlet side is proposed, in that the two media - water and lubricant - are fed separately to the rollers or the rolled strip and to different roller application points - Surface to be applied. Separate storage containers and separate feeds to the spray bars for water and to the spray bars for the lubricant are provided for water and lubricants. It is a great advantage that this results in optimal use of the lubrication or cooling effect of the two media, water and lubricant, and at the same time a reduction in power and labor requirements, due to minimized friction coefficients on the rollers. The ground surface of the roller can withstand even the highest demands. The material peelings observed on the rollers so far are prevented. The surface of the rolled strip remains optimally smooth, scale inclusions and chatter marks on the strip surface are eliminated. Starting from the aforementioned prior art, the invention in cold rolling, in particular in the aluminum industry, but in some cases also in the steel and non-ferrous metal sector, is based on the task of minimizing the tight strip edges and long strip fibers that occur near the edges and reducing strip tears To save trimmings and thereby improve the quality and quantity of the application.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 genannten Art mit der Erfindung ein Verfahren entsprechend Anspruch 1 der vorgeschlagen.To achieve the object, in a method of the type mentioned in the preamble of claim 1, a method according to claim 1 is proposed with the invention.
Mit Hilfe der erfindungsgemäßen Maßnahmen wird nachweisbar die Bandrissgefahr durch Bandkanteneinrisse deutlich verringert und zusätzlich die Bandoberfläche verbessert.With the help of the measures according to the invention, the risk of tape breakage due to tape edge tears is demonstrably reduced and the tape surface is additionally improved.
Durch regelbare Zugspannungsverteilung, insbesondere im Bandkantenbereich wird ein höherer Materialdurchsatz unter Reduzierung von Nebenzeiten bei er- höhter Arbeitsgeschwindigkeit problemlos erreicht. Dazu werden insgesamt die Planheiten deutlich verbessert, die Produktion gesteigert und Walzöl- Umlaufmengen reduziert.By regulating the tension distribution, particularly in the area of the belt edge, a higher material throughput can be achieved without problems, while reducing idle times and increasing working speed. Overall, the flatness will be significantly improved, production increased and rolling oil circulation quantities reduced.
Eine Ausgestaltung des Verfahrens nach Anspruch 1 sieht vor, dass eine ver- mehrte Durchmesserabnahme der Arbeitswalzen an den Kantenbereich infolge partieller Durchmessererhöhung während deren Formgebung mittels induktiver Erwärmung vorgenommen wird.An embodiment of the method according to claim 1 provides that an increased decrease in diameter of the work rolls at the edge region as a result of partial increase in diameter during their shaping is carried out by means of inductive heating.
Weiterhin kann von der Maßnahme Gebrauch gemacht sein, dass die Bandzug- spannungsverteilung durch eine konkav biegbare bzw. gebogene Umlenkrolle derart geändert wird, dass die Bandzugspannung an den Bandkanten verringert und in der Bandmitte erhöht wird.Furthermore, use can be made of the measure that the strip tension distribution is changed by a concavely bendable or curved deflection roller in such a way that the strip tension at the strip edges is reduced and increased in the middle of the strip.
Und schließlich kann von der weiteren Maßnahme Gebrauch gemacht sein, dass bei Vorstichen Material an den Bandkanten durch "Edge Sprays" mit Schmiermittel von relativ höherer Viskosität aufgebaut wird. Eine Vorrichtung zum Aufbringen einer regelbaren Zugspannungsverteilung, insbesondere in Kantenbereichen beim Kaltwalzen von Metallbändern, vorzugsweise zum Durchführen des erfindungsgemäßen Verfahrens kennzeichnet sich durch in wenigstens zwei getrennten Zonen vorhandene Sprühdüsenan- Ordnungen aus mit Anschlüssen an getrennte Sprühmittelzuführungen an unterschiedliche Zonen jeder Arbeitswalze und/oder durch einen Spezialschliff mit Durchmesservergrößerungen an den Endbereichen von Arbeitswalzen zwecks Verlängerung der zu walzenden Bandkanten unter gleichzeitigem Abbau von Zugspannungen und Reduktion langer Bandfasern in randnahen Bereichen der Bandkanten. Die mit diesen Maßnahmen verbundenen Vorteile sind zuvor bei dem erfindungsgemäßen Verfahren beschrieben worden.And finally, use can be made of the further measure that material is built up on the strip edges by means of "edge sprays" with lubricants of relatively higher viscosity during pre-punctures. A device for applying a controllable tension distribution, in particular in edge areas when cold rolling metal strips, preferably for carrying out the method according to the invention, is characterized by spray nozzle arrangements in at least two separate zones with connections to separate spraying agent feeds to different zones of each work roll and / or by one Special sanding with increased diameter at the end areas of work rolls for the purpose of lengthening the strip edges to be rolled while simultaneously reducing tensile stresses and reducing long strip fibers in areas of the strip edges near the edges. The advantages associated with these measures have previously been described in the method according to the invention.
Eine weitere Ausgestaltung der Vorrichtung beinhaltet vorteilhafterweise eine in Bandlaufrichtung konvex biegbare bzw. gebogene Lenkrolle in Anordnung zwi- sehen zwei Führungsrollen zur Veränderung der Zugspannungsverteilung eines Bandes vor dessen Einlauf in ein Walzgerüst.A further embodiment of the device advantageously includes a swivel castor which is convexly bendable or curved in the strip running direction in an arrangement between two guide rollers for changing the tension distribution of a strip before it enters a roll stand.
In Ergänzung hierzu ist die Vorrichtung weiterhin dadurch ausgestaltet, dass sie auf der Einlaufseite eines Walzgerüstes Mittel zur Additiv-Direktauftragung, ins- besondere auf das Walzband z. B. für Schmieröl mit relativ hoher Viskosität, und auf der Auslaufseite der Arbeitswalzen Mittel zur Ballenkühlung der Arbeitswalzen und bevorzugt zusätzliche Mittel zur Schmiermittelentfernung besitzt, die das Walzband mit Vorzug sowohl von der Bandoberseite als auch von der Bandunterseite her mit den zuordenbaren Sprühmedien besprühen.In addition to this, the device is also designed in such a way that it has means for direct additive application, in particular onto the rolled strip, for example, on the inlet side of a roll stand. B. for lubricating oil with a relatively high viscosity, and on the outlet side of the work rolls means for bale cooling of the work rolls and preferably additional means for lubricant removal, which preferably spray the rolled strip from both the top and the underside of the strip with the assignable spray media.
Und schließlich besitzt die Vorrichtung nach der Erfindung eine Einrichtung, welche Kühlmittel in der Auslaufseite des Gerüstes entfernt.Finally, the device according to the invention has a device which removes coolant in the outlet side of the frame.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles. Es zeigen:Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings. Show it:
Figur 1 eine Vorrichtung für "Hot Edge Spray" an der WalzenkanteFigure 1 shows a device for "hot edge spray" on the roller edge
Figur 2 einen Spezialschliff für ArbeitswalzenFigure 2 shows a special grinding for work rolls
Figur 3 In Seitenansicht eine konvex biegbare bzw. gebogene LenkrolleFigure 3 In side view a convex bendable or curved steering roller
Figur 4 Die Draufsicht auf die Lenkrolle gem. Fig. 3Figure 4 The top view of the swivel castor acc. Fig. 3
Figur 5 In Seitenansicht eine erfindungsgemäße Anlage mit Direktauftra- gung von Schmiermittel auf das Walzband, auslaufseitiger Walzenkühlung und Schmiermittelentfernung.FIG. 5 A side view of a system according to the invention with direct application of lubricant to the rolled strip, roller cooling on the outlet side and removal of lubricant.
Figur 1 zeigt einen Teil einer Vorrichtung zum Aufbringen einer regelbaren Zugspannungsverteilung, insbesondere in Kantenbereichen beim Kaltwalzen von Metallbändern, mit in wenigstens zwei getrennten Zonen 10, 10' vorhandenen Sprühdüsenanordnungen 11, 11 ' mit Anschlüssen an getrennte Sprühmittelzuführungen 19, 19' an unterschiedliche Zonen 10, 10' jeder Arbeitswalze 12. Darüber hinaus besteht die Möglichkeit einer partiellen induktiven Erwärmung der Arbeitswalze in an sich bekannter Art.FIG. 1 shows part of a device for applying a controllable tension distribution, in particular in edge areas during cold rolling of metal strips, with spray nozzle arrangements 11, 11 'present in at least two separate zones 10, 10' with connections to separate spray agent feeds 19, 19 'to different zones 10 , 10 'of each work roll 12. In addition, there is the possibility of partial inductive heating of the work roll in a manner known per se.
Figur 2 zeigt ein Paar Arbeitswalzen 12, 12', die jeweils in einem Endbereich einen Spezialschliff 13, 13' mit Durchmesservergrößerungen in den Endberei- chen zur Veriängerung der zu walzenden Bandkanten unter gleichzeitigem Abbau von Zugspannungen und Reduktion langer Bandfasern aufweisen.FIG. 2 shows a pair of work rolls 12, 12 ', each of which has a special grinding 13, 13' in one end area with enlarged diameters in the end areas in order to lengthen the strip edges to be rolled while simultaneously reducing tensile stresses and reducing long strip fibers.
Die Figuren 3 und 4 zeigen gemeinsam in Seitenansicht und in Draufsicht eine Anordnung zur Verlängerung der Zugspannungsverteilung über die Bandbreite bei Fertigstichen. Dies wird erreicht durch einen variablen Umschlingungswinkel W bei Banddicken: 1 - 6 μm mit W = 60 - 90 ° 8 - 20 μm mit W = 45 - 60 ° > 20 μm W = 45 ° und darüber bei Metallfolien W = 15 - 20 °FIGS. 3 and 4 together show a side view and a top view of an arrangement for extending the tension distribution over the bandwidth in finished stitches. This is achieved by a variable wrap angle W for strip thicknesses: 1 - 6 μm with W = 60 - 90 ° 8 - 20 μm with W = 45 - 60 °> 20 μm W = 45 ° and above with metal foils W = 15 - 20 °
Figur 5 zeigt in Seitenansicht eine erfindungsgemäße Anlage, mit einer Abrollhaspel auf der linken Seite und einer Aufrollhaspel auf der rechten Seite sowie Führungsmittel für das Walzband 16 in Bandlaufrichtung 14 sowie Mittel 21 zur Direktauftragung von Schmiermittel mit Viskosität bzw. Additiv auf der Bandein- laufseite sowie Mittel 22 zur Ballenkühlung der auslaufseitigen Arbeitswalzen und mit Mitteln 23 zur auslaufseitigen Schmiermittelentfernung. Damit wird ein Materialaufbau an der Bandkante während der Vorstiche und entsprechend ein Materialabbau an der Bandkante während der Fertigstiche mit Hilfe einer Addi- tiv-Direktauftragung in der Einlaufseite und Walzenkühlung in der Auslaufseite erreicht. Figure 5 shows a side view of a system according to the invention, with a decoiler on the left side and a decoiler on the right side as well as guide means for the rolled strip 16 in the strip running direction 14 and means 21 for direct application of lubricant with viscosity or additive on the strip entry side and Means 22 for cooling the bale of the work rolls on the outlet side and with means 23 for removing lubricant on the outlet side. A material build-up on the belt edge during the preliminary stitches and, accordingly, a material breakdown on the belt edge during the finish stitches is achieved with the aid of an additive direct application on the inlet side and roller cooling on the outlet side.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
10, 10' Sprühzone10, 10 'spray zone
11 , 11' Sprühdüsenanordnung11, 11 'spray nozzle arrangement
12, 12' Arbeitswalzen12, 12 'work rolls
14. Bandlaufrichtung14. Direction of tape travel
15. Lenkrolle15. Swivel castor
16. BandVolume 16
17. Führungsrolle17. Leadership
19. 19' Sprühmittelzuführung19. 19 'spraying agent supply
20. Walzgerüst20. Roll stand
21. Additiv-Auftrag ung21. Additive application
22. Ballenkühlmittel22. Bale coolant
23. Schmiermittelentfernung 23. Lubricant removal

Claims

Patentansprüche claims
1. Verfahren zum Aufbringen einer regelbaren Zugspannungsverteilung, insbe- sondere in den Kantenbereichen beim Kaltwalzen von Metallbändern, zwecks Verringerung der Gefahr eines zu hohen Zugaufbaus und Bandkantenrissen mit der nachteiligen Folge von produktionsmindernden Bandrissen sowie zur Verbesserung der Bandoberfläche und ihrer Planheit auch bei relativ höherer Bandlaufgeschwindigkeit und zur Reduzierung von Bandbe- säumbreiten, gekennzeic net durch die Anwendung wenigstens einer bzw. einer Kombination wenigstens zweier der folgenden Maßnahmen: a) Trennen von Schmierung und Kühlung der Arbeitswalzen durch Schmie- ren an der Einlaufseite und Kühlen an der Auslaufseite, b) zusätzliche Beeinflussung der Band kanten durch "Hot Edge Spray", insbesondere durch zonenweises Aufsprühen von Walzöl mit unterschiedlichen Temperaturbereichen, c) durch Verwendung einer speziellen Schliffgestaltung der Arbeitswalzen im Bereich der Bandkanten zum partiellen Materialaufbau beim Vorstich, der bei folgenden Stichen zu einer längeren Bandkante führt und der Gefahr eines hohen Zugaufbaus entgegenwirkt.1. Method for applying an adjustable tension distribution, in particular in the edge areas when cold rolling metal strips, in order to reduce the risk of excessive tensile build-up and strip edge tears with the disadvantageous consequence of production-reducing strip tears and to improve the strip surface and its flatness even at a relatively high strip running speed and to reduce strip edging widths, characterized by the use of at least one or a combination of at least two of the following measures: a) separation of lubrication and cooling of the work rolls by lubrication on the inlet side and cooling on the outlet side, b) additional ones Influencing the strip edges by "hot edge spray", in particular by spraying rolling oil with different temperature ranges in zones, c) by using a special grinding design of the work rolls in the region of the strip edges for partial material build-up during the pre-stitch , which leads to a longer belt edge in the following stitches and counteracts the risk of high train build-up.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass eine vermehrte Durchmesserabnahme der Arbeitswalzen an den Kantenbereichen infolge partieller Durchmessererhöhung während der Formgebung mittels induktiver Erwärmung vorgenommen wird.2. The method according to claim 1, characterized in that an increased decrease in diameter of the work rolls is carried out at the edge regions as a result of partial increase in diameter during shaping by means of inductive heating.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Bandzugspannungsverteilung durch eine konkav biegbare bzw. gebogene Umlenkrolle derart geändert wird, dass die Bandzugspannung an den Bandkanten verringert und in der Bandmitte erhöht wird.3. The method according to claim 1 or 2, characterized in that the belt tension distribution is changed by a concavely bendable or curved deflection roller in such a way that the belt tension at the belt edges is reduced and increased in the middle of the belt.
4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass bei Vorstichen Material an den Bandkanten durch "Edge Sprays" mit Schmiermittel mit relativ höherer Viskosität aufgebaut wird.4. The method according to one or more of claims 1 to 3, characterized in that during pre-stitches material is built up on the belt edges by "edge sprays" with lubricant with a relatively higher viscosity.
5. Vorrichtung zum Aufbringen einer regelbaren Zugspannungsverteilung, ins- besondere in Kantenbereichen beim Kaltwalzen von Metallbändern, vorzugsweise zur Durchführung des Verfahrens nach den vorhergehenden Ansprüchen, gekennzeichnet durch in wenigstens zwei getrennten Zonen (10, 10') vorhandene Sprühdüsenan- Ordnungen (11, 11') mit Anschlüssen an getrennte Sprühmittelzuführungen (19, 19') an unterschiedliche Zonen (10, 10') jeder Arbeitswalze (12) und/oder einen Spezialschliff (13, 13') mit Durchmesservergrößerungen an den Endbereichen von Arbeitswalzen (12, 12') zur Verlängerung der walzenden Bandkanten unter gleichzeitigem Abbau von Zugspannungen und Reduktion langer Bandfasern in randnahen Bereichen der Bandkanten.5. Apparatus for applying a controllable tension distribution, in particular in edge areas when cold rolling metal strips, preferably for carrying out the method according to the preceding claims, characterized by spray nozzle arrangements (11, 11) present in at least two separate zones (10, 10 ') ') with connections to separate spraying agent feeds (19, 19') to different zones (10, 10 ') of each work roll (12) and / or a special grinding (13, 13') with diameter increases at the end areas of work rolls (12, 12 ') ) to extend the rolling strip edges while simultaneously reducing tensile stress and reducing long strip fibers in areas of the strip edges near the edges.
6. Vorrichtung nach Anspruch 5, gekennzeichnet durch eine in Bandlaufrichtung (14) konvex biegbare bzw. gebogene Lenkrolle (15) in Anordnung zwischen Führungsrollen (17) zur Veränderung der Zugspannungsverteilung eines Bandes (16) vor dessen Einlauf in ein Walzgerüst (20).6. The device according to claim 5, characterized by a in the strip running direction (14) convex bendable or curved steering roller (15) in arrangement between guide rollers (17) for changing the tension distribution of a strip (16) before it enters a roll stand (20).
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass sie auf der Einlaufseite eines Walzgerüstes (20) Mittel zur Additiv- Direktauftragung (21), insbesondere auf das Walzband (16), z. B. für Schmieröl mit relativ hoher Viskosität, und auf der Auslaufseite der Arbeitswalzen (12, 12') Mittel zur Ballenkühlung (22) der Arbeitswalzen und bevorzugt zusätzliche Mittel (23, 23') zur Schmiermittelentfernung besitzt, die das Walzband (16) mit Vorzug sowohl von der Bandoberseite als auch von der Bandunterseite her mit den zuordenbaren Sprühmedien besprühen.7. The device according to claim 5 or 6, characterized in that that they on the inlet side of a roll stand (20) means for additive direct application (21), in particular on the rolled strip (16), for. B. for lubricating oil with a relatively high viscosity, and on the outlet side of the work rolls (12, 12 ') means for bale cooling (22) of the work rolls and preferably additional means (23, 23') for lubricant removal, which the rolled strip (16) with Spray preferably with the assignable spray media from both the top and the bottom of the belt.
8. Vorrichtung nach einem oder mehreren der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass sie eine Einrichtung besitzt, welche Kühlmittel in der Auslaufseite des Gerüstes (20) entfernt. 8. The device according to one or more of claims 5 to 7, characterized in that it has a device which removes coolant in the outlet side of the frame (20).
EP04764552A 2003-09-04 2004-08-27 Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips Not-in-force EP1682288B1 (en)

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DE10352546A DE10352546A1 (en) 2003-09-04 2003-11-11 Method and device for applying an adjustable tensile stress distribution, in particular in the edge regions of cold-rolled metal strips
PCT/EP2004/009578 WO2005023444A2 (en) 2003-09-04 2004-08-27 Method and device for applying an adjustable tensile-stress distribution, in particular in the edge regions of cold-rolled metal strips

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