EP2119514B1 - Procédé pour le dressage d'une bande métallique - Google Patents

Procédé pour le dressage d'une bande métallique Download PDF

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Publication number
EP2119514B1
EP2119514B1 EP09006260.5A EP09006260A EP2119514B1 EP 2119514 B1 EP2119514 B1 EP 2119514B1 EP 09006260 A EP09006260 A EP 09006260A EP 2119514 B1 EP2119514 B1 EP 2119514B1
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EP
European Patent Office
Prior art keywords
levelling
strip
straightening
roll
diameter
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EP09006260.5A
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German (de)
English (en)
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EP2119514A1 (fr
Inventor
Andreas Dipl. -Ing. Noé
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BWG Bergwerk und Walzwerk Maschinenbau GmbH
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BWG Bergwerk und Walzwerk Maschinenbau GmbH
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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
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • 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 straightening a metal strip, in particular a thin metal strip having a thickness up to 1 mm, wherein in the metal strip between a brake roller set and a Werrollensatz a tensile stress of at least 70% of the yield strength is generated, and wherein the band between the brake roller set and the Werrollensatz is directed in a straightening roller group with multiple straightening rollers.
  • - Metal strip means in the context of the invention, in particular a thin metal strip having a thickness of 0.02 mm to 1.0 mm, preferably 0.05 mm to 0.5 mm.
  • the aim of straightening a metal band is to produce a band that is as flat as possible.
  • band ripples and banding which are due to differences in length across the band, band bends often occur, with a distinction being made between longitudinal bends (coil set) and cross bends.
  • the straightening of ribbons is often done using strip tension, e.g. B. when drafting or stretch bending.
  • the diameter of the access rollers is 1500 times greater than the maximum strip thickness (see. DE 39 12 676 C2 ).
  • the vibrations can be sufficiently damped by the use of a spray liquid, but then the spray liquid is to be removed again by way of a belt cleaning, which is associated with increased equipment and operating costs. Furthermore, the position of the correction roller must be readjusted for each band thickness / band material combination.
  • tapes are often planed in practice by means of stretch bending.
  • the tape is bent around a number of straightening rollers with a small diameter and lengthened by overlapping of bending and strip tension plastically by the degree of stretching, so that ripples (approximately) are eliminated.
  • the last straightening rollers are mainly used for the curvature correction.
  • the strip assumes the roll diameter at the first straightening rollers or not.
  • the roll diameters are not accepted, since optimum ribbons of curvature must be set over the wrap angles for different ribbons. For this reason, at least the last straightening rollers are employed differently for different bands. This often results in high commissioning effort in practice. Incidentally, the disadvantage is again the use of relatively small roll diameter.
  • EP 1 311 354 B1 a method and an apparatus for stretch straightening a metal strip, wherein the metal strip passes through a brake roller and a Werrollensatz and is subjected to a stretch between the two sets of rollers in the course of its stretching and arranged in a between the brake roller and the Werrollensatz further set of rollers to increase the degree of stretching of a bend Train is subjected. With this further set of rollers while the main part of the stretch train is generated.
  • the traction rollers of the intermediate roller set can have a different diameter than the rollers of the brake roller set and the Werrollensatzes.
  • the inner traction rollers of this central roller set can have a smaller diameter compared to the rollers of the brake roller set and the Werrollensatzes.
  • the invention has for its object to provide a method for straightening a metal strip and in particular a thin metal strip, which can produce low-residual bands high flatness and beyond lesser longitudinal curvatures in an economical manner.
  • the invention teaches a method for straightening a metal strip, in particular a thin metal strip according to claim 1.
  • the longitudinal curvatures are corrected in the intermediate straightening roller group preferably by alternating bending of the belt exclusively around straightening rollers of sufficiently large diameter and with sufficiently large wrap, so that the band assumes the curvature of the rollers. Since the strip follows the curvature of the rolls, a variation of the depth of immersion has no influence on the directional result. It is in the context of the invention therefore particularly important that the position of the straightening rollers and consequently the immersion depth of a straightening roller between two adjacent straightening rollers of the straightening roller group is fixed and is not changed during the straightening of a band and / or straightening bands of different thickness.
  • All straightening rollers according to the invention have a diameter which is at least 500 times, z. B. is at least 1000 times the thickness of the band to be straightened and preferably also the maximum thickness of a straightening in such a system band.
  • the tension between the brake roller set and Werrollensatz is set according to the invention to at least 75%, more preferably at least 85% of the yield strength.
  • the tension may be adjusted to a value of 90% of the yield strength or more.
  • the tensile stress may be below the yield strength, but also in the range of the yield strength or above the yield strength.
  • Yield strength means in the context of the invention, the yield strength or plastic yield strength R p 0.2 , that is the stress in the pure tensile test, in which the plastic strain is 0.2%. It is therefore within the scope of the invention that between the brake roller set and Werrollensatz straightening the band by plastic strain, z. B. by stretching and / or stretch bending takes place, but the curvature correction is done by alternating bending around the straightening rollers of the straightening roller group.
  • the diameter of the straightening rollers of the straightening roller group increases from roll to roll, preferably by a factor of 1.05 to 1.5, more preferably by a factor of 1.15 to 1.3. You can work with a fixed factor or a variable factor within a straightening roller group.
  • the number of straightening rolls or curvature correction rolls and their diameter graduation is particularly preferably calculated according to a mathematical model which uses as input parameters the strip thickness, the modulus of elasticity, the transverse contraction number, the stress-strain curves, the required degree of stretch to eliminate the waviness, which increases expected variations in strip tension, the expected variations in strength (within a product), the expected band thickness variations (within a product) and / or the amount of the maximum allowable longitudinal residual curvature.
  • the mathematical model then calculates the necessary for different bands starting from a role configuration Strip tensile stresses and the resulting longitudinal residual curvatures.
  • the required number of curvature correction rollers and the optimum gradation of the roller diameters are based on the smallest strip thickness at which a certain longitudinal residual curvature still has to lie within the tolerance.
  • the invention proposes that the position of the straightening rollers and consequently the immersion depth of the straightening rollers between two adjacent straightening rollers within the straightening roller group in the system is fixed and especially during straightening, but also when changing the strip material and / or the strip thickness is not changed ,
  • the position of the straightening rollers and consequently the immersion depth of the straightening rollers between two adjacent straightening rollers within the straightening roller group in the system is fixed and especially during straightening, but also when changing the strip material and / or the strip thickness is not changed .
  • a diameter is chosen which also corresponds to at least 500 times (minimum) strip thickness in these additional straightening rollers.
  • These upstream additional straightening rollers are also arranged between brake roller set and Werrollensatz.
  • the invention also includes preferred embodiments in which a strip treatment in several treatment zones, for. B. several Werreckzonen, takes place, which consequently several sets of clamping rollers to form a plurality of treatment zones, for. B. Switzerlandreckzonen, are connected in series.
  • the straightening roller group according to the invention for eliminating longitudinal curvatures is then always in the last treatment zone, z. B. last Switzerlandreckzone arranged. After the correction of curvature by the straightening rollers, plastic deformation no longer takes place, so that the final result of the straightened and, in addition, longitudinally curvature-free band is maintained.
  • all straightening rollers of the straightening roller group are not driven.
  • the invention also includes embodiments in which one, several or all straightening rollers of the straightening roller group are driven. Such a possibility is, for example, then, when (very) large straightening rollers with large moments of inertia are used. By driving one or more straightening rollers, it is then possible in particular to avoid slippage when starting up the installation.
  • the inventive method can be carried out with a system for straightening a metal strip, in particular a thin metal strip having a thickness ⁇ 1 mm.
  • a system for straightening a metal strip in particular a thin metal strip having a thickness ⁇ 1 mm.
  • a system has at least one brake roller set and a Werner-on-assisted to build the desired tension and at least one arranged between the brake roller set and Werrollensatz straightening roller group with multiple straightening rollers.
  • the diameter of the straightening rollers within the straightening roller group increases in the direction of belt travel from roll to roll.
  • such a straightening roller group has at least four rollers, preferably at least five rollers.
  • the diameter of the straightening rolls is at least 500 times the (minimum) strip thickness and preferably at least 1000 times the (minimum) strip thickness.
  • the diameter of the straightening roller group increases from roll to roll by a factor of 1.05 to 1.5, preferably 1.15 to 1.3.
  • the straightening rollers in the straightening roller group have a diameter of 100 mm to 2000 mm, z. B. 200 mm to 1600 mm, preferably 300 mm to 1500 mm.
  • a system for straightening a metal strip in particular a thin metal strip 1 with a thickness d ⁇ 1 mm is shown.
  • a system has in its basic structure a brake roller set 2 and a Switzerlandrollensatz 3.
  • the brake roller set 2 only a pair of rollers and consequently two brake rollers 2.1 and 2.2
  • the Switzerlandrollensatz 3 also has only one pair of rollers and consequently two tension rollers 3.1 and 3.2.
  • the invention also includes embodiments with pulley sets with more roles, eg. B. four roles or six roles.
  • a strip tension or a tensile stress is generated in the metal strip 1 which is at least 75% of the yield strength, preferably at least 90% of the yield strength.
  • a straightening roller group 4 with a plurality of straightening rollers 4.1, 4.2, 4.3, 4.4, 4.5, 4.6 and 4.7 is arranged within the scope of the invention.
  • longitudinal curvatures of the band are eliminated by means of alternating bending.
  • the diameter D1 - D7 of the rollers of this straightening roller group 4 is relatively large and indeed so large that the band 1 follows the curvature of all of these straightening rollers within the straightening roller group 4 in the selected strip tension. It is in Fig. 1 recognizable that the diameter D1, D2, D3, D4, D5, D6, D7 of the straightening rollers 4.1 to 4.7 of the straightening roller group 4 increases in the direction of tape R from roll to roll and thus becomes larger.
  • the straightening roller group 4 has seven straightening rollers, wherein the roller diameter D1 to D7 increases from roller to roller by a factor of about 1.25. The position of the straightening rollers 4.1 to 4.7 is fixed within the system.
  • Fig. 1 a first embodiment shows, in which between the brake roller set 2 and the Buchrollensatz 3 only the straightening roller group 4 is arranged, shows Fig. 2 a modified embodiment in which the straightening roller group 4 with the straightening rollers 4.1 to 4.6 further auxiliary rollers 5.1, 5.2 and 5.3 are arranged upstream.
  • the diameter D 'of these additional rollers 5.1 to 5.3 corresponds to the diameter D1 of the first straightening roller of the straightening roller group 4th
  • Fig. 3 shows an embodiment in which the straightening rollers 4.1 to 4.7 of the straightening roller group 4 four more additional straightening rollers 5.1 to 5.4 are arranged upstream. These additional straightening rollers 5.1 to 5.4 have a relatively small diameter D 'and form as it were stretch bends. For this reason, each of these straightening rollers 5.1 to 5.4 is supported by support rollers 6. In this embodiment, the straightening roller group according to the invention is therefore preceded by a stretch bender roller group 5.1 to 5.4. Brake roller set and pull roller set are in Fig. 3 not shown.
  • the wrap angles can be made substantially larger in practice than indicated in the figures. There are wrap angles of up to 180 ° or even more conceivable.
  • the first roller 3.1 of the Buchrollensatzes 3 (at the same time) be part of the straightening roller group 4 and consequently also contribute to the plastic deformation of the belt by bending.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (9)

  1. Procédé de dressage d'une bande métallique (1), en particulier d'une bande métallique mince ayant une épaisseur ≤ 1 mm, dans lequel,
    entre le jeu de rouleaux de freinage (2) et le jeu de rouleaux de traction (3), dans au moins un groupe de rouleaux de dressage (4) comportant au moins quatre rouleaux de dressage (4.1 à 4.7), les courbures longitudinales sont corrigées par cintrage,
    le diamètre des rouleaux de dressage (4.1 à 4.7) est assez important pour que la bande, à la traction de bande sélectionnée, suive la courbure des rouleaux de dressage et
    la position des rouleaux de dressage (4.1 à 4.7) et par conséquent la profondeur de plongée d'un rouleau de dressage entre deux rouleaux de dressage voisins du groupe de rouleaux de dressage (4) est préconisée fixement et n'est pas modifiée pendant le dressage d'une bande et lors du dressage de bandes d'épaisseur différente,
    caractérisé en ce que, dans la bande métallique (1), entre un jeu de rouleaux de freinage (2) et un jeu de rouleaux de traction (3), une contrainte de traction d'au moins 75 % de la limite d'étirement est générée et que la bande métallique (1) est dressée par exemple pendant le dressage par cintrage et étirage et/ou l'étirement par traction,
    le diamètre des rouleaux de dressage (4.1 à 4.7) augmentant d'un rouleau à un autre dans le groupe de rouleaux de dressage (4) dans le sens de circulation de la bande,
    le diamètre des rouleaux de dressage (4.1 à 4.7) représentant au moins 500 fois l'épaisseur de la bande à dresser,
    les rouleaux de dressage du groupe de rouleaux de dressage ayant un diamètre de 100 à 2000 mm.
  2. Procédé selon la revendication 1, caractérisé en ce que le groupe de rouleaux de dressage (4) présente au moins cinq rouleaux de dressage (4.1 à 4.7) dont le diamètre augmente d'un rouleau à l'autre.
  3. Procédé selon une des revendications 1 à 2, caractérisé en ce que le diamètre des rouleaux de dressage (4.1 à 4.7) représente au moins 1000 fois l'épaisseur de la bande à dresser.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce que la contrainte de tension représente au moins 85 %, par exemple au moins 90 %, de la limite d'étirement.
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce que le diamètre des rouleaux de dressage (4.1 à 4.7) augmente d'un rouleau à l'autre d'un facteur de 1,05 à 1,5, de préférence d'un facteur de 1,15 à 1,3.
  6. Procédé selon une des revendications 1 à 5, caractérisé en ce que le nombre de rouleaux de dressage du groupe de rouleaux de dressage et l'échelonnement de leur diamètre sont calculés d'après un modèle mathématique qui prend en compte en tant que paramètres d'entrée l'épaisseur de bande ou la plage d'épaisseur de bande, le module d'élasticité, l'indice de contraction transversale, les courbes de tension/extension, le degré d'étirement nécessaire pour supprimer les ondulations, les variations de traction de bande ou de degré d'étirement à attendre, les variations de résistance à attendre, les variations d'épaisseur de bande à attendre et/ou l'amplitude de la courbure résiduelle maximale admissible.
  7. Procédé selon une des revendications 1 à 6, caractérisé en ce que l'épaisseur de la bande à dresser est de 0,02 mm à 1,0 mm, par exemple de 0,05 mm à 0,5 mm.
  8. Procédé selon une des revendications 1 à 7, caractérisé en ce qu'en amont et/ou en aval du groupe de rouleaux de dressage (4) sont disposés un ou plusieurs autres rouleaux de dressage complémentaires (5.1, 5.2, 5.3), le diamètre des rouleaux de dressage complémentaires (5.1, 5.2, 5.3) étant de préférence inférieur ou égal au diamètre du premier rouleau de dressage du groupe de rouleaux de dressage (4).
  9. Procédé selon une des revendications 1 à 8, dans lequel la bande est dressée dans une ou plusieurs zones de traitement de bande, par exemple dans une ou plusieurs zones d'étirement par traction et/ou dans une ou plusieurs zones de cintrage par étirement, caractérisé en ce que le groupe de rouleaux de dressage (4) est disposé dans la dernière zone de traitement de bande, par exemple dans la dernière zone d'étirement par traction ou constitue la dernière zone de traitement de bande.
EP09006260.5A 2008-05-16 2009-05-08 Procédé pour le dressage d'une bande métallique Active EP2119514B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008024013A DE102008024013B3 (de) 2008-05-16 2008-05-16 Verfahren und Vorrichtung zum Richten eines Metallbandes

Publications (2)

Publication Number Publication Date
EP2119514A1 EP2119514A1 (fr) 2009-11-18
EP2119514B1 true EP2119514B1 (fr) 2013-09-04

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US (1) US8291738B2 (fr)
EP (1) EP2119514B1 (fr)
KR (1) KR101537419B1 (fr)
CN (1) CN101579707B (fr)
CA (1) CA2666007A1 (fr)
DE (1) DE102008024013B3 (fr)
ES (1) ES2434225T3 (fr)
RU (1) RU2486023C2 (fr)
ZA (1) ZA200903402B (fr)

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RU2009118475A (ru) 2010-11-20
CN101579707B (zh) 2012-02-01
US20090282883A1 (en) 2009-11-19
KR101537419B1 (ko) 2015-07-16
KR20090119725A (ko) 2009-11-19
US8291738B2 (en) 2012-10-23
CN101579707A (zh) 2009-11-18
CA2666007A1 (fr) 2009-11-16
RU2486023C2 (ru) 2013-06-27
ES2434225T3 (es) 2013-12-16
ZA200903402B (en) 2010-05-26
EP2119514A1 (fr) 2009-11-18
DE102008024013B3 (de) 2009-08-20

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