EP3538291B1 - Method and device for the stretch-bend leveling of a metal strip - Google Patents

Method and device for the stretch-bend leveling of a metal strip Download PDF

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Publication number
EP3538291B1
EP3538291B1 EP17772412.7A EP17772412A EP3538291B1 EP 3538291 B1 EP3538291 B1 EP 3538291B1 EP 17772412 A EP17772412 A EP 17772412A EP 3538291 B1 EP3538291 B1 EP 3538291B1
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Prior art keywords
rollers
stretching
coating
stretching rollers
strip
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German (de)
French (fr)
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EP3538291A1 (en
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Andreas Noé
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Redex SA
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Redex SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling

Definitions

  • the invention relates to a method for stretch-bend straightening a metal strip according to claim 1.
  • the belt usually runs through an inlet tension roller set for tension build-up and an outlet tension roller set for tension reduction, with the belt between the inlet tension roller set and the outlet tension roller set being bent alternately around the stretching rollers and the degree of stretching generated or increased.
  • Unplanarity means e.g. B. band waviness and / or band saber, which arise due to differences in length of the ribbon fibers in the ribbon plane.
  • such imperfections are to be distinguished from strip curvatures in the longitudinal and/or transverse direction, which are caused by bending moments in the strip, e.g. B. when the tape was elastically-plastically bent around pulleys and by elastic-plastic deformations when winding the tape.
  • Longitudinal bends are also referred to as coil sets, transverse bends as cross-bows.
  • the unplanar strip is laid around rolls of sufficiently small diameter (alternately) with a tensile stress that is below the elastic limit RE or its technical limit of elasticity R P0.01 of the strip material in order to eliminate imperfections (i.e. strip waviness and strip sagging). bent so that by superimposing the Tensile stress with the bending an elastic-plastic deformation is generated in the band.
  • the tape is stretched plastically, with the amount of plastic stretching being referred to as the degree of stretching.
  • the originally short ligament fibers are elongated to a relatively greater extent. In the ideal case, after the stretch-bending straightening, all of the ribbon fibers have the same length, so that an ideally straightened ribbon should be created, free from waviness or ribbon sagging.
  • such a stretch bending straightening method is generally carried out using a stretch bending straightening device which has at least one stretch bending stand.
  • a stretch bending frame often has three or five stretch rollers.
  • stretching rollers means stretching rollers that are individually supported (on support rollers), one or more stretching rollers being optionally adjustable individually.
  • a stretch bending stand with its stretching rollers is to be distinguished from a multi-roller straightening unit, which is also known and which generally has a fixed and an adjustable cassette, each with a large number of straightening rollers and support rollers.
  • the straightening rollers are usually frictionally coupled to one another in the respective cassette by the support rollers, which means that all straightening rollers (of a cassette) run at the same speed.
  • residual curvatures are generally eliminated, with the strip in the multi-roller straightening unit generally not being under tension or only under a slight strip tension. A "global" degree of stretching is not generated.
  • a degree of stretching of at least 0.2% is generally produced with the stretching rolls or with the stretch-bending straightening stand.
  • the strip is usually under a tensile stress of at least 15%, preferably at least 20% of the yield point of the metal strip.
  • metal strips are processed in practice, which are provided with a surface oxide layer, z. B. aluminum strips, whereby this oxide layer bursts open when bending around the stretching rollers during stretch-bend straightening, so that oxide particles can detach from the surface of the strip.
  • the stretching rolls in stretch-bend straightening are usually equipped with a metallic surface, e.g. B. made of hardened steel. The dirt or oxide particles can stick to these roller surfaces and build up more and more on them. This leads to vibrations, which in turn lead to unwanted chatter marks on the tape.
  • a further disadvantage of using spray media is that the belt, which is covered with solid moisture, can tend to slip on the tensioning rollers of the outlet clamping set. This means that the tension rollers can only be designed with lower transfer factors.
  • the EP 0 276 614 proposed to provide the draw rolls during stretch bend leveling with a coating of a ceramic material, in a composition which not only has sufficient hardness but also very low wettability with respect to liquids, to prevent metal particle tape coating particles and oxide particles from sticking to the roll .
  • the ceramic layer can z. B. be made on an alumina base. In practice, however, the realization of such stretch-bending rollers with a ceramic coating causes considerable problems.
  • the invention is based on the object of creating a method and a device for stretch-bend leveling a metal strip of the type described at the outset, which allows process control in dry operation in a structurally simple manner.
  • the invention teaches in a generic method and a device for straightening a metal strip that the stretching rollers are provided with a coating of polyurethane or rubber.
  • Plastic coatings are already known in practice in connection with idler pulleys and idler pulleys to z. B. to optimize the friction and thus the transmission factors or to protect the belt surfaces.
  • the use of such plastic coatings is recommended for stretch rollers during stretch-bend straightening, in which the strip is under a tensile stress of usually at least 15%, preferably at least 20%, of the yield point of the metal strip and in which a degree of stretching of at least 0.2% is generated with the stretch rollers.
  • PU coatings have not been considered.
  • stretch bending, z. B. for aluminum strips instead of the usual stretch rollers made of steel actual stretch rollers with z. B.
  • a PU coating can be used.
  • Such stretching rolls are therefore preferably made of a roll core made of metal, z. B. steel, and a coating of plastic, z. B. Polyurethane. With such a coating, the stretch leveling process can be run dry. Surprisingly, it turned out that although the stretching rollers initially get dirty, the degree of dirt stabilizes at a level that allows dry operation without damaging the strip surface. This means that the spray systems used in practice can be dispensed with, so that the associated disadvantages are avoided.
  • plastic coatings in particular polyurethane coatings
  • the angle of wrap around the stretching rollers is set so low as a function of the strip tension that the maximum permissible line load for the coating is not exceeded.
  • the resulting line load on the stretching roll is sufficiently low overall and is below the maximum value permissible for the PU coating.
  • a plastic coating, e.g. B. PU coating also has a certain vibration-damping effect, so that vibrations and chatter marks are minimized or avoided. Also, contamination of the support rollers provided in practice cannot be observed in dry operation.
  • a coating with a hardness of at least 90 Shore A is preferably used.
  • the coating can have a thickness of at least 1 mm, preferably at least 3 mm. That's how it is Possibility to apply a coating with a thickness of e.g. B. 1 mm to 10 mm, preferably 3 mm to 7 mm to use.
  • the stretching rolls have a diameter of 25 mm to 100 mm, preferably 35 mm to 70 mm.
  • the diameter refers to the core, i.e. the specification without the plastic coating.
  • the stretching rollers are each individually supported, that is to say they can each be supported individually on at least two supporting rollers and possibly several intermediate rollers.
  • the individual stretching rollers e.g. below the belt or above the belt
  • the support rollers are not frictionally connected to one another via the support rollers, but are individually supported so that they can rotate at different speeds.
  • One or more stretching rollers can preferably be adjusted individually. There is e.g. B. the possibility that all stretching rollers are individually adjustable.
  • the wrap angles on the individual stretching rollers can preferably be set individually and independently of one another.
  • the coating of the stretch rollers with the coating of polyurethane or rubber.
  • the support rollers and / or the intermediate rollers with a coating of plastic, z. B. be provided with a polyurethane coating.
  • Aluminum strips or strips made from aluminum alloys are preferably used as metal strips. But the invention also includes the Processing of metal strips made of other materials, e.g. B. steel strips or stainless steel strips.
  • the subject matter of the invention is not only the method described, but also a device for stretch-bend straightening metal strips according to claim 15.
  • the method described can preferably be operated with this device.
  • a device for straightening a metal strip B by stretch bending is shown in the figures.
  • the metal strip B can be z. B. be an aluminum strip.
  • the invention also includes the stretch-bend straightening of steel strips or strips made of other metals or alloys.
  • the device has an inlet tension roller set E for building up the strip tension and an outlet tension roller set A for reducing the strip tension.
  • a plurality of stretching rollers 1, 2, 3, 4, 5 are provided between the inlet tension roller set E and the outlet tension roller set A, around which the strip is alternately bent while increasing the degree of stretching.
  • the first stretching roller 1 is preceded by a deflection roller U.
  • Another deflection roller can be arranged downstream of the last stretching roller.
  • Each of these stretching rolls 1 to 5 is supported individually, namely on at least two support rolls 6, which in 1 are not shown. These can be continuous support rollers or rows of segmented support rollers. In any case, the stretching rollers 1 - 5 are supported individually, that is to say they are not connected to one another by friction (in contrast to a multi-roller straightening unit) via the supporting rollers 6 .
  • the stretching rollers 1 - 5 With the stretching rollers 1 - 5, a degree of stretching of at least 0.2% is generated.
  • the tension in the metal strip B during stretch-bend leveling is generated with the infeed tension roller set E and the outlet tension roller set A.
  • the tensile stress is at least 15%, preferably at least 20%, of the yield point of the metal strip.
  • all stretching rollers 1 to 5 are provided with a non-metallic coating 8 .
  • the individual stretch rollers consequently consist of a roll core 7 and a casing 8.
  • the coating is a coating 8 made of plastic, preferably made of polyurethane or a comparable plastic.
  • This coating 8 can have a thickness of z. B. 1 mm to 10 mm, preferably 3 mm to 7 mm.
  • the stretching rolls 1 to 5 have a diameter of 25 mm to 100 mm, e.g. B. 35 mm to 70 mm, which means the diameter of the stretch rollers without the coating and consequently the diameter of the roller core 7 is meant.
  • Figures 2a and 2b 10 show embodiments in which only the stretching rollers 1-5 are provided with the plastic coating 8 according to the invention, while the support rollers 6 and the intermediate rollers 6′ that may be provided are not provided with a coating.
  • Figure 2a shows an embodiment with two support rollers 6 and
  • Figure 2b shows an embodiment in which additional intermediate rollers 6' are provided.
  • Figure 3a 1 shows an embodiment in which the coated stretching roll 1-5 is supported on two coated support rolls 6.
  • the coatings 8 'of the support rollers 6 can also be made of polyurethane or another plastic.
  • Figure 3b shows an embodiment in which the stretching rolls 1 - 5 are supported by two intermediate rolls 6' and three back-up rolls 6 or three rows of segmented back-up rolls.
  • the draw rolls are 1-- 5 and the support rolls 6 are provided with a coating 8 and 8', respectively, while the intermediate rolls 6' are uncoated.
  • 3c 12 shows a modification of the embodiment Figure 3b , with the intermediate rollers 6' here also being provided with a coating 8".
  • metal strips B can be straightened in dry operation, that is to say there is no need to apply a spray medium to the stretch rollers 1-5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Streckbiegerichten eines Metallbandes gemäß dem Anspruch 1.The invention relates to a method for stretch-bend straightening a metal strip according to claim 1.

Dabei durchläuft das Band in der Regel einen Einlaufspannrollensatz zum Zugaufbau und einen Auslaufspannrollensatz zum Zugabbau, wobei das Band zwischen dem Einlaufspannrollensatz und dem Auslaufspannrollensatz wechselseitig um die Streckrollen gebogen und dabei der Streckgrad erzeugt bzw. erhöht wird.The belt usually runs through an inlet tension roller set for tension build-up and an outlet tension roller set for tension reduction, with the belt between the inlet tension roller set and the outlet tension roller set being bent alternately around the stretching rollers and the degree of stretching generated or increased.

Mit einem solchen Streckbiegerichtverfahren lassen sich unplane Metallbänder richten und folglich Unplanheiten beseitigen. Unplanheit meint z. B. Bandwelligkeit und/oder Bandsäbeligkeit, welche sich aufgrund von Längenunterschieden der Bandfasern in der Bandebene ergeben. Im Rahmen dieser Erfindung sind solche Unplanheiten von Bandkrümmungen in Längs- und/oder Querrichtung zu unterscheiden, welche durch Biegemomente im Band entstehen, z. B. wenn das Band elastisch-plastisch um Umlenkrollen gebogen wurde und durch elastisch-plastische Verformungen beim Aufwickeln des Bandes. Längskrümmungen werden auch als Coil-Set, Querkrümmungen als Cross-Bow bezeichnet.With such a stretch bending straightening process, unplanar metal strips can be straightened and consequently unplanarities can be eliminated. Unplanarity means e.g. B. band waviness and / or band saber, which arise due to differences in length of the ribbon fibers in the ribbon plane. Within the scope of this invention, such imperfections are to be distinguished from strip curvatures in the longitudinal and/or transverse direction, which are caused by bending moments in the strip, e.g. B. when the tape was elastically-plastically bent around pulleys and by elastic-plastic deformations when winding the tape. Longitudinal bends are also referred to as coil sets, transverse bends as cross-bows.

Im Zuge des Streckbiegerichtens wird zum Beseitigen von Unplanheiten (das heißt Bandwelligkeit und Bandsäbel) das unplane Band mit einer Zugspannung, welche unterhalb der Elastizitätsgrenze RE bzw. deren technischen Elastizitätsgrenze RP0,01 des Bandmaterials liegt, um Rollen hinreichend kleinen Durchmessers (wechselseitig) gebogen, so dass durch die Überlagerung der Zugspannung mit der Biegung eine elastisch-plastische Verformung im Band erzeugt wird. Das Band wird plastisch gelängt, wobei die Höhe der plastischen Längung als Streckgrad bezeichnet wird. Bei der plastischen Längung werden die ursprünglich kurzen Bandfasern relativ stärker gelängt. Im Idealfall haben nach dem Streckbiegerichten alle Bandfasern die gleiche Länge, so dass grundsätzlich ein ideal gerichtetes Band frei von Welligkeiten oder Bandsäbel entstehen soll.In the course of stretch-bending straightening, the unplanar strip is laid around rolls of sufficiently small diameter (alternately) with a tensile stress that is below the elastic limit RE or its technical limit of elasticity R P0.01 of the strip material in order to eliminate imperfections (i.e. strip waviness and strip sagging). bent so that by superimposing the Tensile stress with the bending an elastic-plastic deformation is generated in the band. The tape is stretched plastically, with the amount of plastic stretching being referred to as the degree of stretching. During plastic elongation, the originally short ligament fibers are elongated to a relatively greater extent. In the ideal case, after the stretch-bending straightening, all of the ribbon fibers have the same length, so that an ideally straightened ribbon should be created, free from waviness or ribbon sagging.

In der Praxis wird ein solches Verfahren zum Streckbiegerichten in der Regel mit einer Streckbiegerichtvorrichtung durchgeführt, die zumindest ein Streckbiegegerüst aufweist. Ein solches Streckbiegegerüst weist in der Praxis häufig drei oder fünf Streckrollen auf.In practice, such a stretch bending straightening method is generally carried out using a stretch bending straightening device which has at least one stretch bending stand. In practice, such a stretch bending frame often has three or five stretch rollers.

Streckrollen meint im Rahmen der Erfindung einzeln (an Stützrollen) abgestützte Streckrollen, wobei gegebenenfalls eine oder auch mehrere Streckrollen einzeln anstellbar sind. Insofern ist ein solches Streckbiegegerüst mit seinen Streckrollen von einer ebenfalls bekannten Vielrollenrichteinheit zu unterscheiden, die in der Regel eine feste und eine anstellbare Kassette mit jeweils einer Vielzahl von Richtrollen und Stützrollen aufweist. Die Richtrollen sind innerhalb einer solchen Vielrollenrichteinheit in der Regel in der jeweiligen Kassette durch die Stützrollen reibschlüssig miteinander gekoppelt, das heißt, dass alle Richtrollen (einer Kassette) mit der gleichen Geschwindigkeit laufen. In einer solchen Vielrollenrichteinheit erfolgt in der Regel die Eliminierung von Restkrümmungen, wobei das Band in der Vielrollenrichteinheit in der Regel nicht unter Zug oder lediglich unter einem geringen Bandzug steht. Ein "globaler" Streckgrad wird nicht erzeugt.In the context of the invention, stretching rollers means stretching rollers that are individually supported (on support rollers), one or more stretching rollers being optionally adjustable individually. In this respect, such a stretch bending stand with its stretching rollers is to be distinguished from a multi-roller straightening unit, which is also known and which generally has a fixed and an adjustable cassette, each with a large number of straightening rollers and support rollers. Within such a multi-roller straightening unit, the straightening rollers are usually frictionally coupled to one another in the respective cassette by the support rollers, which means that all straightening rollers (of a cassette) run at the same speed. In such a multi-roller straightening unit, residual curvatures are generally eliminated, with the strip in the multi-roller straightening unit generally not being under tension or only under a slight strip tension. A "global" degree of stretching is not generated.

Von dem Eliminieren von Bandrestkrümmungen in einer Vielrollenrichteinheit (ohne Bandzug oder bei lediglich geringem Bandzug und ohne nennenswerte Erzeugung von Streckgrad) ist daher erfindungsgemäß das Streckbiegerichten zu unterscheiden. Mit den Streckrollen bzw. mit dem Streckbiegerichtgerüst wird in der Regel ein Streckgrad von zumindest 0,2 % erzeugt. Das Band steht in der Regel unter einer Zugspannung von zumindest 15%, vorzugsweise zumindest 20 % der Streckgrenze des Metallbandes.From the elimination of residual strip curvature in a multi-roller straightening unit (without strip tension or with only slight strip tension and without significant Generation of degree of stretching) is therefore to be distinguished according to the invention between stretch bending straightening. A degree of stretching of at least 0.2% is generally produced with the stretching rolls or with the stretch-bending straightening stand. The strip is usually under a tensile stress of at least 15%, preferably at least 20% of the yield point of the metal strip.

In der Praxis ist zu berücksichtigen, dass das Metallband beim Einlauf in die Streckbiegerichtanlage bzw. in das Streckbiegegerüst nicht immer komplett sauber ist. Häufig ist die Bandoberfläche mit Schmutz oder einem Rest Walzölfilm behaftet. Außerdem werden in der Praxis Metallbänder verarbeitet, die mit einer Oberflächenoxidschicht versehen sind, z. B. Aluminiumbänder, wobei diese Oxidschicht bei der starken Biegung um die Streckrollen beim Streckbiegerichten aufplatzt, so dass sich Oxidpartikel von der Bandoberfläche lösen können. Die Streckrollen beim Streckbiegerichten sind in der Praxis in der Regel mit einer metallischen Oberfläche, z. B. aus gehärtetem Stahl ausgeführt. Die Schmutz- bzw. Oxidpartikel können an diesen Rollenoberflächen anhaften und sich auf ihnen mehr und mehr aufbauen. Das führt zu Vibrationen, die wiederum zu unerwünschten Rattermarken auf dem Band führen.In practice, it must be taken into account that the metal strip is not always completely clean when it enters the stretch leveling system or the stretch bending stand. The strip surface is often covered with dirt or a residual film of rolling oil. In addition, metal strips are processed in practice, which are provided with a surface oxide layer, z. B. aluminum strips, whereby this oxide layer bursts open when bending around the stretching rollers during stretch-bend straightening, so that oxide particles can detach from the surface of the strip. In practice, the stretching rolls in stretch-bend straightening are usually equipped with a metallic surface, e.g. B. made of hardened steel. The dirt or oxide particles can stick to these roller surfaces and build up more and more on them. This leads to vibrations, which in turn lead to unwanted chatter marks on the tape.

Um das Anhaften von Schmutz- bzw. Oxidpartikeln an den Rollen und die damit verbundenen Probleme zu vermeiden, ist es in der Praxis üblich, den Streckbiegerichtprozess nass zu betreiben. Das Band und eventuell auch die Streckrollen und Stützrollen werden einlaufseitig mit einem Sprühmedium besprüht oder in sonstiger Weise beaufschlagt. Auf diese Weise werden die störenden Partikel abgewaschen und ein Partikelaufbau an den Rollen wird verhindert. Als Sprühmedium kommen dabei in der Praxis wasserbasierte Medien zum Einsatz. Nachteilig ist dabei, dass eine komplette Reinigung und Trocknung des Bandes vordem Aufwickeln erforderlich ist, da sonst die Restfeuchte im aufgewickelten Coil zu Korrosionsschäden führt. Alternativ können lösemittelbasierte Sprühmedien wie z. B. kerosinbasierte Medien eingesetzt werden. Nachteilig ist dabei die Lösemittelverdampfung, so dass eine Absaugung und gegebenenfalls eine Abluftreinigung vorgesehen werden muss. Außerdem sind solche Lösemittel entflammbar, so dass Brandschutzeinrichtungen vorzusehen sind.In order to prevent dirt or oxide particles from adhering to the rollers and the associated problems, it is common in practice to run the stretch-levelling process wet. The strip and possibly also the stretching rollers and support rollers are sprayed with a spray medium on the inlet side or acted upon in some other way. In this way, the disturbing particles are washed off and a particle build-up on the rollers is prevented. In practice, water-based media are used as the spray medium. The disadvantage here is that the strip must be completely cleaned and dried before it is wound up, since otherwise the residual moisture in the wound up coil will lead to corrosion damage. Alternatively, solvent-based spray media such as B. kerosene-based media can be used. The disadvantage here is the evaporation of the solvent, so that an extraction system and, if necessary, an exhaust air purification system must be provided. In addition, such solvents are flammable, so fire protection equipment must be provided.

Ein weiterer Nachteil des Einsatzes von Sprühmedien besteht darin, dass das mit Festfeuchte behaftete Band auf den Spannrollen des Auslaufspannsatzes zu einem Schlupfen neigen kann. Dieses führt dazu, dass die Spannrollen nur mit geringeren Übertragungsfaktoren ausgelegt werden können.A further disadvantage of using spray media is that the belt, which is covered with solid moisture, can tend to slip on the tensioning rollers of the outlet clamping set. This means that the tension rollers can only be designed with lower transfer factors.

Alternativ wurde in der EP 0 276 614 vorgeschlagen, die Streckrollen beim Streckbiegerichten mit einer Beschichtung aus einem keramischen Material zu versehen, und zwar in einer Zusammensetzung, die nicht nur eine ausreichende Härte sondern ebenfalls eine sehr niedrige Benetzbarkeit hinsichtlich Flüssigkeiten aufweist, um das Kleben von Metallteilchenbandüberzugteilchen und Oxidteilchen an der Rolle zu verhindern. Die Keramikschicht kann dabei z. B. auf einer Aluminiumoxidbasis gefertigt sein. Die Realisierung solcher Streckbiegerollen mit Keramikbeschichtung bereitet in der Praxis jedoch erhebliche Probleme.Alternatively, in the EP 0 276 614 proposed to provide the draw rolls during stretch bend leveling with a coating of a ceramic material, in a composition which not only has sufficient hardness but also very low wettability with respect to liquids, to prevent metal particle tape coating particles and oxide particles from sticking to the roll . The ceramic layer can z. B. be made on an alumina base. In practice, however, the realization of such stretch-bending rollers with a ceramic coating causes considerable problems.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Streckbiegerichten eines Metallbandes der eingangs beschriebenen Art zu schaffen, das bzw. die auf konstruktiv einfache Weise eine Prozessführung im Trockenbetrieb ermöglicht.Against this background, the invention is based on the object of creating a method and a device for stretch-bend leveling a metal strip of the type described at the outset, which allows process control in dry operation in a structurally simple manner.

Zur Lösung dieser Aufgabe lehrt die Erfindung bei einem gattungsgemäßen Verfahren und einer Vorrichtung zum Streckbiegerichten eines Metallbandes, dass die Streckrollen mit einer Beschichtung aus Polyurethan oder Gummi versehen sind.In order to solve this problem, the invention teaches in a generic method and a device for straightening a metal strip that the stretching rollers are provided with a coating of polyurethane or rubber.

Kunststoffbeschichtungen sind in der Praxis bereits im Zusammenhang mit Spannrollen und Umlenkrollen bekannt, um z. B. die Reibung und damit die Übertragungsfaktoren zu optimieren oder die Bandoberflächen zu schützen. Für Streckrollen beim Streckbiegerichten, bei denen das Band unter einer Zugspannung von üblicherweise zumindest 15%, vorzugsweise zumindest 20% der Streckgrenze des Metallbandes steht und bei welchem mit den Streckrollen ein Streckgrad von zumindest 0,2 % erzeugt wird, ist der Einsatz solcher Kunststoffbeschichtungen, z. B. PU-Beschichtungen bislang nicht in Erwägung gezogen worden. Überraschend wurde nun festgestellt, dass beim Streckbiegerichten, z. B. für Aluminiumbänder, statt der üblichen Streckrollen aus Stahl tatsächlich Streckrollen mit z. B. einer PU-Beschichtung eingesetzt werden können. Solche Streckrollen bestehen folglich bevorzugt aus einem Rollenkern aus Metall, z. B. aus Stahl, und einer Beschichtung aus Kunststoff, z. B. Polyurethan. Mit einer solchen Beschichtung kann der Streckbiegerichtprozess trocken gefahren werden. Überraschend hat sich herausgestellt, dass die Streckrollen zwar zunächst verschmutzen, der Verschmutzungsgrad stabilisiert sich aber auf einem Niveau, welches einen Trockenbetrieb gestattet, ohne dass die Bandoberfläche beschädigt wird. Damit kann auf die in der Praxis eingesetzten Sprühsysteme verzichtet werden, so dass die damit verbundenen Nachteile vermieden werden. Im Gegensatz zu den im Stand der Technik vorgeschlagenen Keramikbeschichtungen lassen sich Kunststoffbeschichtungen, insbesondere Polyurethanbeschichtungen einfach und kostengünstig realisieren und überraschend wurde festgestellt, dass die Umschlingungswinkel um die Streckrollen in Abhängigkeit von den Bandzügen so gering eingestellt werden können, dass die für die Beschichtung zulässige maximale Linienlast nicht überschritten wird. Befürchtungen im Zusammenhang mit PU-Oberflächen, wonach die z. B. segmentierten Stützrollen oder Zwischenrollen Abdrücke auf der PU-Oberfläche hervorrufen könnten, haben sich nicht bestätigt. Trotz eines recht hohen erforderlichen Bandzuges für den gewünschten Streckgrad ist die resultierende Linienlast auf die Streckrolle insgesamt hinreichend gering und liegt unter dem für die PU-Beschichtung zulässigen Maximalwert. Ergänzend hat eine Kunststoffbeschichtung, z. B. PU-Beschichtung auch eine gewisse schwingungsdämpfende Wirkung, so dass Vibrationen und Rattermarken minimiert bzw. vermieden werden. Auch eine Verschmutzung der in der Praxis vorgesehenen Stützrollen ist im Trockenbetrieb nicht zu beobachten.Plastic coatings are already known in practice in connection with idler pulleys and idler pulleys to z. B. to optimize the friction and thus the transmission factors or to protect the belt surfaces. The use of such plastic coatings is recommended for stretch rollers during stretch-bend straightening, in which the strip is under a tensile stress of usually at least 15%, preferably at least 20%, of the yield point of the metal strip and in which a degree of stretching of at least 0.2% is generated with the stretch rollers. e.g. B. PU coatings have not been considered. Surprisingly, it has now been found that when stretch bending, z. B. for aluminum strips, instead of the usual stretch rollers made of steel actual stretch rollers with z. B. a PU coating can be used. Such stretching rolls are therefore preferably made of a roll core made of metal, z. B. steel, and a coating of plastic, z. B. Polyurethane. With such a coating, the stretch leveling process can be run dry. Surprisingly, it turned out that although the stretching rollers initially get dirty, the degree of dirt stabilizes at a level that allows dry operation without damaging the strip surface. This means that the spray systems used in practice can be dispensed with, so that the associated disadvantages are avoided. In contrast to the ceramic coatings proposed in the prior art, plastic coatings, in particular polyurethane coatings, can be implemented simply and inexpensively, and it was surprisingly found that the angle of wrap around the stretching rollers is set so low as a function of the strip tension that the maximum permissible line load for the coating is not exceeded. Concerns in connection with PU surfaces, after which the z. B. segmented support rollers or intermediate rollers could cause marks on the PU surface, have not been confirmed. Despite a very high strip tension required for the desired degree of stretching, the resulting line load on the stretching roll is sufficiently low overall and is below the maximum value permissible for the PU coating. In addition, a plastic coating, e.g. B. PU coating also has a certain vibration-damping effect, so that vibrations and chatter marks are minimized or avoided. Also, contamination of the support rollers provided in practice cannot be observed in dry operation.

Damit ist es insgesamt möglich, die Metallbänder einwandfrei und ohne Oberflächenbeschädigungen im Trockenbetrieb zu fahren.This makes it possible overall to run the metal strips properly and without surface damage in dry operation.

Im Stand der Technik wird in der JP63-199023 A und der JP63-199024 A der Einsatz einer Kunststoffbeschichtung bei einer Vielrollenrichteinheit beschrieben. In einem solchen "roll leveler" steht das Metallband in der Regel unter keinem oder lediglich sehr geringem Bandzug und es wird auch kein nennenswerter Streckgrad erzeugt, so dass lediglich sehr geringe Belastungen der Rollen und der Beschichtungen auftreten. Im Vordergrund steht dabei der Schutz des Metallbandes durch die Kunststoffbeschichtung, so dass Beschädigungen des Bandes vermieden werden sollen. Der Erfindung liegt demgegenüber ein anderer Gedanke zugrunde.In the prior art is in the JP63-199023A and the JP63-199024A the use of a plastic coating in a multi-roller straightening unit is described. In such a "roll leveler" the metal strip is generally not under any or only very little strip tension and no appreciable degree of stretching is generated either, so that only very low loads on the rolls and the coatings occur. The protection of the metal strip by the plastic coating is in the foreground, so that damage to the strip is to be avoided. In contrast, the invention is based on a different idea.

Bevorzugt kommt im Rahmen der Erfindung eine Beschichtung einer Härte von zumindest 90 Shore A zum Einsatz. Die Beschichtung kann eine Dicke von zumindest 1 mm, vorzugsweise zumindest 3 mm aufweisen. So besteht die Möglichkeit, eine Beschichtung mit einer Dicke von z. B. 1 mm bis 10mm, bevorzugt 3 mm bis 7 mm zu verwenden.Within the scope of the invention, a coating with a hardness of at least 90 Shore A is preferably used. The coating can have a thickness of at least 1 mm, preferably at least 3 mm. That's how it is Possibility to apply a coating with a thickness of e.g. B. 1 mm to 10 mm, preferably 3 mm to 7 mm to use.

Die Streckrollen weisen erfindungsgemäß einen Durchmesser von 25 mm bis 100 mm, bevorzugt 35 mm bis 70 mm auf. Der Durchmesser bezieht sich dabei auf den Kern, das heißt die Angabe ohne die Kunststoffbeschichtung.According to the invention, the stretching rolls have a diameter of 25 mm to 100 mm, preferably 35 mm to 70 mm. The diameter refers to the core, i.e. the specification without the plastic coating.

Die Streckrollen sind beim Streckbiegerichten bzw. in einem Streckbiegerichtgerüst jeweils einzeln abgestützt, das heißt sie können jeweils einzeln an zumindest zwei Stützrollen und gegebenenfalls mehreren Zwischenwalzen abgestützt sein. Im Gegensatz zu einer Vielrollenrichteinheit sind die einzelnen Streckrollen (z. B. unterhalb des Bandes oder oberhalb des Bandes) nicht über die Stützrollen reibschlüssig miteinander verbunden, sondern einzeln abgestützt, so dass sie mit unterschiedlichen Geschwindigkeiten rotieren können. Bevorzugt sind ein oder mehrere Streckrollen einzeln anstellbar. Es besteht z. B. die Möglichkeit, dass alle Streckrollen einzeln anstellbar sind. Üblicherweise ist aber auch möglich, bei mehreren Streckrollen lediglich die unteren Streckrollen gegen die oberen Streckrollen oder umgekehrt die oberen Streckrollen gegen die unteren Streckrollen anzustellen. Bevorzugt sind jedoch die Umschlingungswinkel an den einzelnen Streckrollen einzeln und unabhängig voneinander einstellbar.During stretch-bending straightening or in a stretch-bending straightening stand, the stretching rollers are each individually supported, that is to say they can each be supported individually on at least two supporting rollers and possibly several intermediate rollers. In contrast to a multi-roller straightening unit, the individual stretching rollers (e.g. below the belt or above the belt) are not frictionally connected to one another via the support rollers, but are individually supported so that they can rotate at different speeds. One or more stretching rollers can preferably be adjusted individually. There is e.g. B. the possibility that all stretching rollers are individually adjustable. However, it is usually also possible in the case of several stretching rollers to position only the lower stretching rollers against the upper stretching rollers or, conversely, to position the upper stretching rollers against the lower stretching rollers. However, the wrap angles on the individual stretching rollers can preferably be set individually and independently of one another.

Im Vordergrund der Erfindung steht die Beschichtung der Streckrollen mit der Beschichtung aus Polyurethan oder Gummi. Ergänzend können aber auch die Stützrollen und/oder die Zwischenwalzen mit einer Beschichtung aus Kunststoff, z. B. einer Polyurethanbeschichtung versehen sein.In the foreground of the invention is the coating of the stretch rollers with the coating of polyurethane or rubber. In addition, the support rollers and / or the intermediate rollers with a coating of plastic, z. B. be provided with a polyurethane coating.

Bevorzugt werden als Metallbänder Aluminiumbänder oder Bänder aus Aluminium-Legierungen verwendet. Die Erfindung umfasst aber auch die Verarbeitung von Metallbändern aus anderen Materialien, z. B. von Stahlbändern oder Edelstahlbändern.Aluminum strips or strips made from aluminum alloys are preferably used as metal strips. But the invention also includes the Processing of metal strips made of other materials, e.g. B. steel strips or stainless steel strips.

Gegenstand der Erfindung ist nicht nur das beschriebene Verfahren, sondern auch eine Vorrichtung zum Streckbiegerichten von Metallbändern gemäß Anspruch 15. Mit dieser Vorrichtung lässt sich bevorzugt das beschriebene Verfahren betreiben. Im Einzelnen wird zur bevorzugten Ausgestaltung der Vorrichtung auf die Erläuterungen zum beschriebenen Verfahren verwiesen.The subject matter of the invention is not only the method described, but also a device for stretch-bend straightening metal strips according to claim 15. The method described can preferably be operated with this device. In detail, reference is made to the explanations of the method described for the preferred embodiment of the device.

Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen

Fig.1
eine Anlage zum Streckbiegerichten eines Metallbandes in einer vereinfachten Darstellung,
Fig. 2a und 2b
einen vergrößerten Ausschnitt aus dem Gegenstand nach Fig. 1 in verschiedenen erfindungsgemäßen Ausführungsformen und
Fig. 3a, 3b und 3c
weitere Ausführungsformen der Erfindung.
The invention is explained in more detail below with reference to a drawing that merely shows an exemplary embodiment. Show it
Fig.1
a system for stretch-bend straightening a metal strip in a simplified representation,
Figures 2a and 2b
an enlarged section of the object 1 in various embodiments according to the invention and
Figures 3a, 3b and 3c
further embodiments of the invention.

In den Figuren ist eine Vorrichtung zum Streckbiegerichten eines Metallbandes B dargestellt. Bei dem Metallband B kann es sich z. B. um ein Aluminiumband handeln. Die Erfindung umfasst aber auch das Streckbiegerichten von Stahlbändern oder Bändern aus anderen Metallen oder Legierungen.A device for straightening a metal strip B by stretch bending is shown in the figures. The metal strip B can be z. B. be an aluminum strip. However, the invention also includes the stretch-bend straightening of steel strips or strips made of other metals or alloys.

Die Vorrichtung weist in ihrem grundsätzlichen Aufbau einen Einlaufspannrollensatz E zum Aufbau des Bandzuges und ein Auslaufspannrollensatz A zum Abbau des Bandzuges auf. Zwischen dem Einlaufspannrollensatz E und dem Auslaufspannrollensatz A sind mehrere Streckrollen 1, 2, 3, 4, 5 vorgesehen, um welche das Band unter Erhöhung des Streckgrades wechselseitig gebogen wird. Im Übrigen ist erkennbar, dass der ersten Streckrolle 1 eine Umlenkrolle U vorgeordnet ist. Der letzten Streckrolle kann eine weitere Umlenkrolle nachgeordnet sein.In its basic structure, the device has an inlet tension roller set E for building up the strip tension and an outlet tension roller set A for reducing the strip tension. A plurality of stretching rollers 1, 2, 3, 4, 5 are provided between the inlet tension roller set E and the outlet tension roller set A, around which the strip is alternately bent while increasing the degree of stretching. Furthermore, it can be seen that the first stretching roller 1 is preceded by a deflection roller U. Another deflection roller can be arranged downstream of the last stretching roller.

Jede dieser Streckrollen 1 bis 5 ist einzeln abgestützt, und zwar an zumindest zwei Stützrollen 6, die in Fig. 1 nicht dargestellt sind. Dabei kann es sich um durchgehende Stützrollen oder um Reihen von segmentierten Stützrollen handeln. Jedenfalls sind die Streckrollen 1 - 5 einzeln abgestützt, das heißt sie sind (im Gegensatz zu einer Vielrollenrichteinheit) nicht über die Stützrollen 6 reibschlüssig miteinander verbunden.Each of these stretching rolls 1 to 5 is supported individually, namely on at least two support rolls 6, which in 1 are not shown. These can be continuous support rollers or rows of segmented support rollers. In any case, the stretching rollers 1 - 5 are supported individually, that is to say they are not connected to one another by friction (in contrast to a multi-roller straightening unit) via the supporting rollers 6 .

Mit den Streckrollen 1 - 5 wird ein Streckgrad von zumindest 0,2 % erzeugt. Mit dem Einlaufspannrollensatz E und dem Auslaufspannrollensatz A wird die Zugspannung im Metallband B während des Streckbiegerichtens erzeugt. Die Zugspannung beträgt zumindest 15%, vorzugsweise zumindest 20% der Streckgrenze des Metallbandes.With the stretching rollers 1 - 5, a degree of stretching of at least 0.2% is generated. The tension in the metal strip B during stretch-bend leveling is generated with the infeed tension roller set E and the outlet tension roller set A. The tensile stress is at least 15%, preferably at least 20%, of the yield point of the metal strip.

In dem dargestellten Ausführungsbeispiel sind sämtliche Streckrollen 1 bis 5 mit einer nichtmetallischen Beschichtung 8 versehen. Die einzelnen Streckrollen bestehen folglich aus einem Rollenkern 7 und einer Ummantelung 8. Erfindungsgemäß handelt es sich bei der Beschichtung um eine Beschichtung 8 aus Kunststoff, vorzugsweise aus Polyurethan oder einem vergleichbaren Kunststoff. Diese Beschichtung 8 kann eine Dicke von z. B. 1 mm bis 10 mm, bevorzugt 3 mm bis 7 mm betragen. Die Streckrollen 1 bis 5 weisen einen Durchmesser von 25 mm bis 100 mm, z. B. 35 mm bis 70 mm auf, wobei damit der Durchmesser der Streckrollen ohne die Beschichtung und folglich der Durchmesser des Rollenkerns 7 gemeint ist.In the embodiment shown, all stretching rollers 1 to 5 are provided with a non-metallic coating 8 . The individual stretch rollers consequently consist of a roll core 7 and a casing 8. According to the invention, the coating is a coating 8 made of plastic, preferably made of polyurethane or a comparable plastic. This coating 8 can have a thickness of z. B. 1 mm to 10 mm, preferably 3 mm to 7 mm. The stretching rolls 1 to 5 have a diameter of 25 mm to 100 mm, e.g. B. 35 mm to 70 mm, which means the diameter of the stretch rollers without the coating and consequently the diameter of the roller core 7 is meant.

Die Fig. 2a und 2b zeigen dabei Ausführungsformen, bei denen lediglich die Streckrollen 1 - 5 mit der erfindungsgemäßen Kunststoffbeschichtung 8 versehen sind, während die Stützrollen 6 und die gegebenenfalls vorgesehenen Zwischenwalzen 6' nicht mit einer Beschichtung versehen sind. Fig. 2a zeigt dabei eine Ausführungsform mit zwei Stützrollen 6 und Fig. 2b zeigt eine Ausführungsform, bei welcher zusätzlich Zwischenwalzen 6' vorgesehen sind.the Figures 2a and 2b 10 show embodiments in which only the stretching rollers 1-5 are provided with the plastic coating 8 according to the invention, while the support rollers 6 and the intermediate rollers 6′ that may be provided are not provided with a coating. Figure 2a shows an embodiment with two support rollers 6 and Figure 2b shows an embodiment in which additional intermediate rollers 6' are provided.

Davon ausgehend zeigen die Fig. 3a, 3b und 3c Ausführungsformen, bei denen zusätzlich zu den Streckrollen 1 - 5 auch weitere Rollen mit einer Beschichtung versehen sind.Proceeding from this, the Figures 3a, 3b and 3c Embodiments in which, in addition to the stretching rollers 1-5, other rollers are also provided with a coating.

Fig. 3a zeigt eine Ausführungsform, bei welcher die beschichtete Streckrolle 1 - 5 an zwei beschichteten Stützrollen 6 abgestützt ist. Die Beschichtungen 8' der Stützrollen 6 können ebenfalls aus Polyurethan oder einem anderen Kunststoff bestehen. Figure 3a 1 shows an embodiment in which the coated stretching roll 1-5 is supported on two coated support rolls 6. FIG. The coatings 8 'of the support rollers 6 can also be made of polyurethane or another plastic.

Fig. 3b zeigt eine Ausführungsform, bei der die Streckrollen 1 - 5 durch zwei Zwischenwalzen 6' und drei Stützrollen 6 bzw. drei Reihen segmentierter Stützrollen abgestützt sind. Bei dieser Ausführungsform sind die Streckrollen 1-- 5 und die Stützrollen 6 mit einer Beschichtung 8 bzw. 8' versehen, während die Zwischenwalzen 6' unbeschichtet sind. Figure 3b shows an embodiment in which the stretching rolls 1 - 5 are supported by two intermediate rolls 6' and three back-up rolls 6 or three rows of segmented back-up rolls. In this embodiment, the draw rolls are 1-- 5 and the support rolls 6 are provided with a coating 8 and 8', respectively, while the intermediate rolls 6' are uncoated.

Fig. 3c zeigt eine Abwandlung der Ausführungsform nach Fig. 3b, wobei hier auch die Zwischenwalzen 6' mit einer Beschichtung 8" versehen sind. 3c 12 shows a modification of the embodiment Figure 3b , with the intermediate rollers 6' here also being provided with a coating 8".

Mit der dargestellten Streckbiegerichtanlage lassen sich Metallbänder B im Trockenbetrieb richten, das heißt auf eine Beaufschlagung der Streckrollen 1- 5 mit einem Sprühmedium wird verzichtet.With the stretch bending straightening system shown, metal strips B can be straightened in dry operation, that is to say there is no need to apply a spray medium to the stretch rollers 1-5.

Claims (15)

  1. Method for stretch-bend-levelling a metal strip (B), wherein the metal strip (B) is alternately bent under tensile stress around respectively individually supported stretching rollers (1 - 5) of a diameter of 25 mm to 100 mm and the degree of stretching is increased in the process,
    wherein one or more stretching rollers (1 - 5) are provided with a non-metallic coating, characterised in that one or more stretching rollers are provided with a coating (8) made of polyurethane or rubber.
  2. Method according to claim 1, characterised in that the metal strip passes through an infeed tensioning roller set (E) for tension increase and an outfeed tensioning roller set (A) for tension reduction, wherein the strip (B) is alternately bent around the stretching rollers (1 - 5) between the infeed tensioning roller set (E) and the outfeed tensioning roller set (A) and the degree of stretching is increased in the process.
  3. Method according to claim 1 or 2, characterised in that all stretching rollers (1 - 5) are provided with a coating (8) made of plastic.
  4. Method according to any of claims 1 to 3, characterised in that the coating (8) has a hardness of at least 90 Shore A.
  5. Method according to any of claims 1 to 4, characterised in that the metal strip (B) passes through the stretching rollers (1 - 5) in dry operation without application to the stretching rollers of a spray medium or the like.
  6. Method according to any of claims 1 to 5, characterised in that the wrap angles around the stretching rollers (1 - 5) are adjusted depending on the strip tension in such a way that the maximum line load permissible for the coating (8) is not exceeded.
  7. Method according to any of claims 1 to 6, characterised in that a degree of stretching of at least 0.2 % is produced with the stretching rollers (1 - 5).
  8. Method according to any of claims 1 to 7, characterised in that the strip is under a tensile stress of at least 15%, preferably at least 20%, of the tensile yield point of the metal strip (B).
  9. Method according to any of claims 1 to 8, characterized in that the coating (8) has a thickness of at least 1 mm, preferably at least 3 mm, e.g. a thickness of 1 mm to 10 mm, preferably 3 mm to 7mm.
  10. Method according to any of claims 1 to 9, characterised in that the stretching rollers (1 - 5) have a diameter of 35 mm to 70 mm.
  11. Method according to any of claims 1 to 10, characterised in that one or more or all stretching rollers (1 - 5) are individually adjustable.
  12. Method according to any of claims 1 to 11, characterised in that three to five stretching rollers (1 - 5) are arranged between the infeed tensioning roller set (E) and the outfeed tensioning roller set (A) .
  13. Method according to any of claims 1 to 12, characterised in that the stretching rollers (1 - 5) are each individually supported on at least two support rollers and/or intermediate rollers.
  14. Method according to claim 13, characterised in that the support rollers (6) and/or the intermediate rollers (6') are also provided with a coating (8', 8") made of plastic, e.g. polyurethane.
  15. Device for stretch-bend-levelling a metal strip using a method according to any of claims 1 to 14, with at least
    - an infeed tension roller set (E) for increasing the strip tension,
    - an outfeed tension roller set (A) for reducing the strip tension,
    - several stretching rollers (1 - 5) arranged between the infeed tensioning roller set (E) and the outfeed tensioning roller set (A), around which the belt is alternately bent while increasing the degree of stretching,
    - wherein the stretching rollers are each individually supported and have a diameter of 25 mm to 100 mm,
    - wherein one or more stretching rollers (1 - 5) are provided with a non-metallic coating,
    characterised in that the stretching rollers (1 - 5) are provided with a coating (8) made of polyurethane or rubber.
EP17772412.7A 2016-11-09 2017-09-25 Method and device for the stretch-bend leveling of a metal strip Active EP3538291B1 (en)

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DE102016121448.5A DE102016121448B4 (en) 2016-11-09 2016-11-09 Method and device for stretch bending of a metal strip
PCT/EP2017/074210 WO2018086794A1 (en) 2016-11-09 2017-09-25 Method and device for the stretch-bend leveling of a metal strip

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EP3538291A1 (en) 2019-09-18
US20210346930A1 (en) 2021-11-11
WO2018086794A1 (en) 2018-05-17
CA3040160C (en) 2021-07-06
CN109952164A (en) 2019-06-28
RU2751912C2 (en) 2021-07-20
RU2019117616A3 (en) 2020-12-10
CA3040160A1 (en) 2018-05-17
DE102016121448A1 (en) 2018-05-09
RU2019117616A (en) 2020-12-10

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