EP3377239B1 - Procédé et dispositif de dressage d'une bande par traction et flexion - Google Patents

Procédé et dispositif de dressage d'une bande par traction et flexion Download PDF

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Publication number
EP3377239B1
EP3377239B1 EP17704234.8A EP17704234A EP3377239B1 EP 3377239 B1 EP3377239 B1 EP 3377239B1 EP 17704234 A EP17704234 A EP 17704234A EP 3377239 B1 EP3377239 B1 EP 3377239B1
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Prior art keywords
levelling
rolls
roll
system section
strip
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EP17704234.8A
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German (de)
English (en)
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EP3377239A1 (fr
Inventor
Andreas 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 and a device for stretch bending of a strip, wherein the strip under a tensile stress below the elastic limit is alternately bent around straightening rollers in the plastic or elastic-plastic region, according to the preamble of claim 1 and of claim 10.
  • unplane tapes preferably metal tapes
  • Unplanarity means z. B. Ribbon waviness and / or Bandsäbeltechnik, which arise due to differences in length of the ribbon fibers in the band level.
  • unevenness also means strip curvatures in longitudinal and / or transverse directions, which arise due to bending moments in the strip, eg. B. when the band was elastically-plastically bent around pulleys or by elastic-plastic deformation during winding of the tape.
  • Longitudinal curvatures are also referred to as coil set, transverse curvatures as cross-bow.
  • the unplane band under a tensile stress which is below the elastic limit R E or their technical elastic limit R P0,01 of the strip material, bent by rollers of sufficiently small diameter (mutually), so that by superimposing the tension with the bend an elastic-plastic deformation is generated in the band.
  • the strip is elongated plastically, the height of the plastic elongation being called the degree of stretching.
  • the originally short ribbon fibers are elongated relatively more strongly.
  • all strapping fibers have the same length after straightening, so that in principle an ideal strapping should be free from undulations and band saber.
  • the mutual bending in the elastic-plastic region can in principle be re-established the straightening residual moments remain in the band, which can be visible in the band treatment line as a transverse curvature and can lead to a cut-out panel to a plastic residual curvature in the longitudinal and / or transverse direction.
  • the residual bending moments arise when the individual bends are not optimally matched in their intensity.
  • the bending radii depend on the band data (thickness, modulus of elasticity, cyclic strength behavior, transverse contraction number), the strip tension, the roll diameters and the geometry of the strip run around the rolls. In a first approximation, the latter can be described by the angle of wrap of the band around the rollers.
  • the tape will take on the radius of the roll. Then the band curvatures reach their maximum and further increasing wrap angle or increasing tension constant. As a rule, however, the wrap angles are adjusted so that the tape does not follow the roll radius in the stretch bending stand. By adjusting the roles and thus setting the wrap angle can thus adjust the bending radii.
  • a method of the type mentioned is z. B. from the WO 2011/032890 A1 known.
  • the band is bent alternately by at least four straightening rollers, wherein the bending radii are adjusted positionally controlled independently of each other on all four straightening rollers. It is advantageous that works with relatively few straightening rollers and that residual curvatures in the longitudinal and transverse directions are defined adjustable.
  • the last straightening roller can be adjusted so that longitudinal curvatures within a certain "window" change only slightly with the degree of stretching.
  • the method is particularly suitable for situations in which a relatively low degree of stretching is required.
  • the invention is therefore an object of the invention to provide a stretch bending, which ensures optimum flatness results in an economical manner and preferably at low plant outlay, especially in high-strength tapes and high degrees of elongation required.
  • the invention teaches a method for stretch bending of a strip, in particular a metal strip, with the method steps of claim 1.
  • a strip in particular a metal strip
  • the method steps of claim 1 Preferably, at least 95% of the (plastic)Polstreckgrades are generated in the first plant section.
  • the degree of stretching is produced in the first section of the plant, more preferably at least 95% of the total degree of stretching.
  • the residual bending moments are reduced.
  • the values of the residual curvatures in the longitudinal and transverse directions can be set independently of one another.
  • the last (single) straightening roller can be employed in such a way that the variability of the residual curvatures is minimized as a function of yield-degree fluctuations or yield-strength fluctuations. The process becomes insensitive in this way.
  • the method is particularly suitable for the processing of metal strips with limited formability, z.
  • high-strength steel strips but are strongly unplanatory before straightening and therefore require a high degree of stretching.
  • the elongation in the edge fiber of the tape during straightening must not exceed this value (the elongation at break) exceed, otherwise the surface of the tape could break.
  • the marginal fiber strain is composed of the bending strain and the superposed tensile strain (plastic yield plus elastic tensile strain).
  • the invention is based on the recognition that the bending strain must be limited to the straightening rollers, so that according to the invention is used with several straightening rollers.
  • the invention has recognized that it is advantageous to work in the first plant section with a relatively high number of upper and lower straightening rollers, so that preferably a Mehrrollenrichthim is used, in which at least three upper straightening rollers and three lower straightening rollers, more preferably at least four upper straightening rollers and four lower straightening rollers are provided.
  • the required overall yield in the plant is 0.5% and 90% (and consequently 0.45% of yield strength) is produced with the upper and lower straightening rolls in the first plant section, this corresponds to one degree of stretch per straightening roll (at eight up to nine straightening rollers in the first section) from 0.05% to 0.06%.
  • the upper straightening rollers or lower rollers are employed together against the (fixed) lower straightening rollers or, conversely, the lower straightening rollers are employed together against the (fixed) upper straightening rollers.
  • the respectively non-adjustable straightening rollers can then be arranged stationary or only have a quick adjustment (without variation possibilities in the positioning).
  • the upper straightening rollers are consequently jointly positionally adjustable against the lower straightening rollers employed or alternatively, the lower straightening rollers are jointly positionally adjusted against the upper straightening rollers.
  • the process can be carried out particularly economically equipment, since it can be dispensed with an individual employment of the upper straightening rollers and the lower straightening rollers in the first section of the plant.
  • the wrap angles and thus the bending radii on the upper straightening rollers and the lower straightening rollers are (essentially) set identically.
  • the wrap angles are therefore particularly preferred in the first section of the plant and thus bending radii are set (essentially) identically both on the upper straightening rollers and on the lower straightening rollers.
  • the wrap angle and thus bending radii on the straightening rollers in the second system section can be set independently of one another and independently of the bending radii in the first system section, preferably adjusted in a position-controlled manner.
  • the (high) degree of stretching is produced in the first section, namely 90%, particularly preferably 95%, of the total degree of stretching is generated, while in the second section the residual bending moments are reduced.
  • the wrap angle at the first straightening roller of the second system section is set smaller than the wrap angle of the straightening rollers in the first system section.
  • the wrap angle of the straightening rollers in the second system section from straightening roll to straightening roll decrease.
  • the device has a plurality (ie, two or more) of the Mehrrollenrichtech downstream in the strip running direction individual straightening rollers on which the wrap angles are individually and independently and independently of the Mehrrollenrichtech adjustable.
  • These individual straightening rollers are preferably individually and independently of each other (against the band) adjustable, z. B. adjustable position adjustable.
  • the straightening rollers can each be assigned deflection rollers, so that the straightening rollers can be adjusted against the respective deflection roller.
  • the wrap angles at the individual straightening rollers can also be adjusted by the fact that the deflection rollers (position-controlled) can be adjusted against the respective straightening roller.
  • This device is particularly preferably suitable for carrying out the method according to the invention described above.
  • the Mehrrollenrichtogni (in total) forms the described first plant section and that the individual straightening rollers form the described second plant section, so that in this case at least 90% of the total degree of yawing are generated in the Mehrrollenrichtogni.
  • the Mehrrollenrichtech is arranged downstream of a guide roller, which is adjustable to adjust the wrap angle and consequently the bending radius of the last (upper or lower) straightening roller of Mehrrollenrichtech against this last straightening roller, and that is preferably positionally adjustable.
  • a guide roller which is adjustable to adjust the wrap angle and consequently the bending radius of the last (upper or lower) straightening roller of Mehrrollenrichtvenez against this last straightening roller, and that is preferably positionally adjustable.
  • each of these individual straightening rollers can also each be followed by a deflection roller.
  • the straightening rollers themselves are employed against the deflection rollers or, alternatively, also upstream and / or downstream deflection rollers for adjusting the wrap angle against a (fixed) straightening roller are employed. Always a position control of the straightening rollers and / or pulleys may be appropriate.
  • the pulleys have a diameter that is (significantly) greater than the diameter of the straightening rollers. It is envisaged that the diameter of the deflection rollers is so large that no or only negligibly small plastic deformations take place on the deflection rollers, which do not disturb the process.
  • the upper part and / or the lower part of the Mehrrollenrichtvenez is pivotable about an axis parallel to the tape longitudinal axis extending / are. With such a pivoting of the straightening rollers, it is possible to achieve a uniform degree of stretch over the bandwidth, even if the band has a wedge-shaped thickness profile.
  • the method described and the plant described are particularly suitable for materials with limited forming capacity, since the degree of stretching is generated at a plurality of straightening rollers within the first plant section, so that the degree of stretching per roller is limited. Also the required Bending amplitude is limited. It is important that at least the last three bends are adjustable independently of each other, wherein the first of these last three bends can optionally take place with the last roll of a Mehrrollenrichtvenez.
  • the preferred Mehrrollenrichtgerüst used differs from conventional Dahlrollenrichtgerüsten, which are also referred to as "multiroll leveler” and in which the straightening rollers z. B. are rotatably coupled to each other via corresponding support rollers.
  • Such frictional coupling via the support rollers in conventional systems means that all straightening rollers run at the same speed. Due to the elongations generated in the strip during the stretch bending, the strip runs correspondingly faster from roll to roll.
  • upper part and lower part are preferably not pivoted relative to one another in the sense of an opening or closing mouth, but rather the upper part and / or the lower part are raised or lowered overall. This can be in a particularly simple way in the first section of the installation, set substantially identical angles of wrap on the straightening rollers.
  • the method according to the invention is insensitive to fluctuations in the process parameters and flat strips with small residual curvatures can be produced.
  • the tendency to the center or edge wave is adjustable via a bending of the lower straightening rollers or at least a lower straightening roller.
  • the upper straightening rollers can be used.
  • Coil-Set and Cross-Bow are separately adjustable.
  • a system for stretch bending of metal strips B is shown.
  • the system has in its basic structure a Einlaufspannollensatz 1 for building the tape tension and a Auslaufspannrollensatz 2 for reducing the tape tension.
  • a Mehrrollenrichtech 3 Between the Einlaufspannrollenensatz 1 and the Auslaufspannrollensatz 2 are a Mehrrollenrichtvenez 3 and Subsequently, a plurality of individual straightening rollers 6, 7 are arranged.
  • the tape running direction is indicated by the arrow R.
  • the Mehrrollenrichtwork 3 has an upper part 4 with a plurality of upper straightening rollers 4a, 4b, 4c, 4d, 4e and a lower part 5 with a plurality of lower straightening rollers 5a, 5b, 5c, 5d.
  • the upper straightening rollers are supported on support rollers 4 'and the lower straightening rollers are supported on support rollers 5'.
  • the individual upper straightening rollers are not rotationally coupled with each other and the individual lower straightening rollers are not rotationally coupled with each other.
  • the upper part 4 and the lower part 5 are set against each other for adjusting the wrap angle and thus bending radii at the individual upper and lower straightening rollers. In the illustrated embodiment, the upper part 4 position adjustable against the (fixed) lower part 5 can be adjusted.
  • a substantially horizontal strip movement is indicated.
  • the invention also includes embodiments with a non-horizontal tape run.
  • the lower part can be made against the upper part.
  • the Mehrrollenrichthim 3 are the individual straightening rollers 6, 7 downstream. At these straightening rollers, the wrap angles can be adjusted individually and independently of the multi-roller straightening unit, so that the bending radii on these straightening rollers 6, 7 can be adjusted separately.
  • Fig. 2 shows an enlarged section of the Fig. 1 in the field of Mehrrollenrichtech and the downstream individual straightening rollers in a first embodiment.
  • the multi-roller straightening unit 3 is arranged downstream of a deflection roller 10. This is against the last straightening roller 4e of the Mehrrollenrichtsatzes 3rd unemployable. This makes it possible to set the wrap angle on the last straightening roller 4e of the multi-roller straightening unit 3 separately and independently of the other wrap angles on the remaining upper and lower straightening rollers of the multi-roller straightening unit.
  • this last straightening roller 4e is an upper straightening roller.
  • the number and arrangement of the straightening rollers of the Mehrrollenrichtvenez 3 is made such that the last straightening roller is a lower straightening roller, the guide roller 10 then not on the lower side of the belt, but on the upper side of the belt works.
  • Fig. 2 indicated that the guide rollers 6, 7 each have a guide roller 11, 12 is arranged upstream and the straightening rollers 6, 7 are supported on support rollers 6 ', 7'.
  • the straightening rollers 6, 7 against the respective deflection roller can be adjusted.
  • the pulleys 11, 12 (position-controlled) against the respective straightening roller 6, 7 are used to adjust the wrap angle and thus bending radii.
  • Fig. 3 shows one opposite Fig. 2 modified embodiment in which the Mehrrollenrichtmaschine 3 also two individual straightening rollers 6, 7 are arranged downstream. However, only the straightening roller 7 is preceded by a guide roller 12, which is thus also downstream of the straightening roller 6 at the same time.
  • high-strength metal bands can be addressed, wherein the metal strip alternately in a first plant section A 1 around a plurality of upper straightening rollers 4a to 4d and a plurality of lower straightening rollers 5a to 5d is bent, wherein in this first plant section A 1 at least 90% of the total degree of stretching are generated.
  • this first plant section A 1 at least 90% of the total degree of stretching are generated.
  • rest curvatures of the tape are eliminated by the belt B is guided around three straightening rollers 4e, 6, 7 and thereby bent, at which the bending radii and consequently wrap angles individually and independently and independently of the bending radii of the remaining straightening rollers of the first section of the installation can be set.
  • FIG. 4 shows Fig. 4 a modified embodiment in which all of the straightening rollers 4a to 4e and 5a to 5d of the multi-roller straightening unit 3 are assigned to the first plant section A 1 .
  • the guide roller 10 is not engageable, so that in the Mehrrollenrichtech identical bending radii are set on all roles, via the employment of the upper part 4.
  • This Mehrrollenrichtü are then three individual straightening rollers 6, 7, 8 downstream, each individually and independently of the Mehrrollenrichtvenez 3 are adjustable, and preferably also adjustable in position.
  • Each of these straightening rollers 6, 7, 8 is arranged in the embodiment, a guide roller 11, 12, 13 upstream.
  • each of the straightening rollers 6, 7, 8 optionally also a further deflection roller 11 ', 12', 13 'be arranged downstream.
  • the multi-roller straightening unit 3 or its first straightening roller 4a may be preceded by a deflection roller 9.
  • the upper or lower straightening rollers can be pivoted about the belt longitudinal axis in the first section of the plant in order to achieve a uniform degree of stretch over the belt width. Details are not shown in the figures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)

Claims (16)

  1. Procédé, destiné au dressage par traction d'une bande (B), notamment d'une bande métallique, dans une première partie d'installation (A1), la bande (B) étant tordue en diagonale autour de plusieurs rouleaux dresseurs (4a à 4d) supérieurs et plusieurs rouleaux dresseurs (5a à 5d) inférieurs, dans ladite première partie d'installation (A1) étant créés au moins 90 % du taux d'étirage total et par la suite, dans une deuxième partie d'installation (A2), des courbures résiduelles de la bande étant éliminées, en ce que la bande (B) est tordue autour d'au moins trois rouleaux dresseurs (4e, 6, 7, 8), caractérisé en ce que sur les rouleaux dresseurs (4e, 6, 7, 8) de la deuxième partie d'installation (A2), les angles d'enroulement sont réglés chacun individuellement et indépendamment les uns des autres et indépendamment des angles d'enroulement sur les rouleaux dresseurs (4a à 4d, 5a à 5d) de la première partie d'installation.
  2. Procédé selon la revendication 1, caractérisé en ce que dans la première partie d'installation (A1), les rouleaux dresseurs (4a à 4d) supérieurs sont mis en prise en commun contre les rouleaux dresseurs (5a à 5d) inférieurs ou inversement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que dans la première partie d'installation (A1), les rouleaux dresseurs (4a à 4d) supérieurs sont mis en prise en commun contre les rouleaux dresseurs (5a à 5d) inférieurs ou en ce que, réglés en position, les rouleaux dresseurs (5a à 5d) inférieurs sont mis en prise en commun contre les rouleaux dresseurs (4a à 4d) supérieurs.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que dans la première partie d'installation (A1), les angles d'enroulement sur les rouleaux dresseurs (4a à 4d) supérieurs sont réglés à l'identique et/ou en ce que les angles d'enroulement sur les rouleaux dresseurs (5a à 5d) inférieurs sont réglés à l'identique.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que dans la deuxième partie d'installation (A2), les angles d'enroulement sont réglés individuellement sur les rouleaux dresseurs (4e, 6, 7, 8) en ce que par exemple, réglés en position, les rouleaux dresseurs ou des rouleaux de renvoi associés sont mis en prise.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que dans la première partie d'installation (A1) sont créés au moins 95% d taux d'étirage total.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les angles d'enroulement dans la première partie d'installation (A1) sont supérieurs aux angles d'enroulement dans la deuxième partie d'installation (A2) et/ou en ce que les angles d'enroulement dans la deuxième partie d'installation (A2) décroissent de rouleau en rouleau.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'un ou plusieurs ou tous les rouleaux dresseurs supérieurs et/ou inférieurs dans la première partie d'installation (A1) sont pivotés ou pivotants autour d'un axe s'écoulant à la parallèle de l'axe longitudinal de la bande.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'un ou plusieurs ou tous les rouleaux dresseurs inférieurs dans la première partie d'installation sont courbés ou susceptibles d'être courbés.
  10. Dispositif, destiné au dressage par traction d'une bande (B) notamment d'une bande métallique, notamment d'après un procédé selon l'une quelconque des revendications 1 à 9, pourvu d'une unité à rouleaux multiples (3) avec une partie supérieure (4), pourvue de plusieurs rouleaux dresseurs (4a à 4e) supérieurs et d'une partie inférieure (5), pourvue de plusieurs rouleaux dresseurs (5a à 5d) inférieurs, les rouleaux dresseurs (4a à 4e) supérieurs étant couplés entre eux sans rotation et les rouleaux dresseurs (5a à 5d) inférieurs étant couplés entre eux sans rotation, pour le réglage des angles d'enroulement, la partie supérieure (4) et la partie inférieure (5) étant susceptibles d'être mises en prise l'une contre l'autre et pourvu de plusieurs rouleaux dresseurs (6, 7, 8) individuels, placés en aval de l'unité à rouleaux multiples (3) dans la direction de déroulement de la bande, caractérisé en ce que sur les rouleaux dresseurs (6, 7, 8), les angles d'enroulement sont réglables chacun individuellement et indépendamment les uns des autres et indépendamment de l'unité à rouleaux multiples (3).
  11. Dispositif selon la revendication 10, caractérisé en ce que les rouleaux dresseurs (6, 7, 8) individuels sont susceptibles d'être mis en prise, par exemple réglés en position ou en ce que des rouleaux de renvoi associés aux rouleaux dresseurs sont susceptibles d'être mis en prise, par exemple réglés en position.
  12. Dispositif selon la revendication 10 ou 11, caractérisé en ce que, réglée(s) en position, la partie supérieure (4) et/ou la partie inférieure (5) de l'unité à rouleaux multiples (3) est ou sont susceptible (s) d'être mise (s) en prise.
  13. Dispositif selon l'une quelconque des revendications 10 à 12, caractérisé en ce qu'un rouleau de renvoi (10), qui pour le réglage de l'angle d'enroulement du dernier rouleau dresseur (4e) supérieur ou inférieur de l'unité à rouleaux multiples (3) est placé en aval de l'unité à rouleaux multiples (3) est susceptible d'être mis en prise contre le dernier rouleau dresseur (4e) .
  14. Dispositif selon l'une quelconque des revendications 10 à 13, caractérisé en ce qu'en amont des rouleaux dresseurs (6, 7, 8) individuels est placé chaque fois un rouleau de renvoi (11, 12, 13) et/ou en leur aval est placé chaque fois un rouleau de renvoi (11', 12', 13'), en option, pour le réglage de l'angle d'enroulement sur les rouleaux dresseurs (6, 7, 8), un ou plusieurs rouleau (x) de renvoi (11, 12, 13, 11', 12', 13') étant susceptible (s) d'être mis en prise contre les rouleaux dresseurs.
  15. Dispositif selon l'une quelconque des revendications 1 à 14, caractérisé en ce que la partie supérieure (4) et/ou la partie inférieure (5) de l'unité à rouleaux multiples (3) est/sont susceptible(s) de pivoter autour d'un axe s'écoulant à la parallèle de l'axe longitudinal de la bande.
  16. Dispositif selon l'une quelconque des revendications 1 à 15, caractérisé en ce qu'un ou plusieurs rouleaux de l'unité à rouleaux multiples (3) sont équipés d'une déformation de rouleau.
EP17704234.8A 2016-04-05 2017-02-08 Procédé et dispositif de dressage d'une bande par traction et flexion Active EP3377239B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016106208.1A DE102016106208A1 (de) 2016-04-05 2016-04-05 Verfahren zum Streckbiegerichten eines Bandes
PCT/EP2017/052782 WO2017174231A1 (fr) 2016-04-05 2017-02-08 Procédé et dispositif de dressage d'une bande par traction et flexion

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Publication Number Publication Date
EP3377239A1 EP3377239A1 (fr) 2018-09-26
EP3377239B1 true EP3377239B1 (fr) 2019-03-27

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EP (1) EP3377239B1 (fr)
CN (1) CN108698101A (fr)
DE (1) DE102016106208A1 (fr)
WO (1) WO2017174231A1 (fr)

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DE102020106730A1 (de) 2020-03-12 2021-09-16 Manfred Wanzke Richtverfahren für Band, Draht, Profile, Stäbe, Rohre, Zuschnitte, Sandwichbleche und Platinen, in welchem das zu richtende Material eingangs eine beliebige, annähernd gleichmäßige Krümmung erfährt, die nachfolgend im Durchlauf final gerichtet wird

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