EP3253505B1 - Méthode et dispositif pour le gaufrage par laminage d' une bande - Google Patents

Méthode et dispositif pour le gaufrage par laminage d' une bande Download PDF

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Publication number
EP3253505B1
EP3253505B1 EP16701520.5A EP16701520A EP3253505B1 EP 3253505 B1 EP3253505 B1 EP 3253505B1 EP 16701520 A EP16701520 A EP 16701520A EP 3253505 B1 EP3253505 B1 EP 3253505B1
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EP
European Patent Office
Prior art keywords
roll
strip
rolling
work
control
Prior art date
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Application number
EP16701520.5A
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German (de)
English (en)
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EP3253505A1 (fr
Inventor
Kai-Friedrich Karhausen
Gernot NITZSCHE
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Speira GmbH
Original Assignee
Hydro Aluminium Rolled Products GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/021—Twin mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/14—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/24—Forming parameters asymmetric rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a method for embossing a strip with a roll stand comprising a first work roll and a second work roll, wherein between the first work roll and the second work roll, a roll gap is defined with a pass line. Furthermore, the invention relates to a device for embossing a strip, in particular for carrying out a method according to the invention, comprising a rolling stand having a first work roll and a second work roll, wherein between the first work roll and second work roll, a roll gap is defined with a pass line.
  • Rolld strips and sheets can be provided with a certain surface structure during the production in a final rolling pass, in particular a last cold-rolled pass.
  • a roll stand is used, wherein at least one of the work rolls of the roll stand has a defined surface structure, which is introduced by the rolling pass in the surface of the strip or sheet.
  • Such a surface structure can prepare the tape or the sheet for a certain further processing.
  • automotive industry but also in other applications, such as aircraft or rail vehicle construction plates are required, which have a very good forming behavior and allow high degrees of deformation.
  • automotive engineering typical applications are the body and chassis parts.
  • visible, painted components for example exterior body panels
  • it is necessary that the forming of the materials must be carried out in such a way that the surface after painting is not impaired by defects such as flow patterns or roping. This is particularly important, for example, for the use of metal sheets for the production of bonnets and other body parts of a motor vehicle.
  • the embossing stitch also changes the forming behavior of the tape with the specific surface structure introduced by the embossing roll stitch, i. the resulting by the embossing rolling pattern, favorably influenced.
  • the surface structure of the strip introduced during rolling down, for example, the friction between the sheet metal and the forming tool.
  • the surface structure is preferably formed so that the sheet can be better wetted with lubricants during forming.
  • the surface may have depressions in the form of lubrication pockets, which can absorb lubricants. As a result, the friction forces during forming are further reduced and higher degrees of deformation are possible.
  • the surface structure of the strip or the rolling pattern there must be a possibility to adjust the surface structure of the strip or the rolling pattern.
  • embossing rolling with small Stichabnce it is particularly difficult to ensure a consistently uniform embossing of the surface structure of the work rolls, especially on both sides of the strip.
  • the work rolls of the roll stand are subject to wear and thus have a surface structure which changes over time during operation.
  • the surface structure of the work rolls over time the material of the tape or impurities record and thereby produce a variable over time rolling pattern.
  • the band which is fed to the rolling stand is usually subject to fluctuations, making it difficult to achieve a uniform rolling pattern.
  • the supplied tape may for example vary in dimensions such as the thickness, the width or the curvature or the profile or in the strength, which in turn can vary the rolling pattern during rolling.
  • the present invention is therefore based on the technical problem of specifying a method and an apparatus for rolling, in which the surface structure of a band on the top and bottom can be controlled reliably and the disadvantages of the prior art can be avoided.
  • This technical problem is solved according to a first technical teaching of the present invention by a method for rolling a strip in that a control roller in the rolling direction in front of the nip of the work rolls is arranged, the tape on the control roller at an entrance angle ⁇ relative to the pass line in the nip the roll stand is guided and the surface structure of the belt is controlled by the choice of the inlet angle ⁇ depending on the positioning of the control roller relative to the pass line.
  • the rolling mill used in the method according to the invention comprises a first work roll and a second work roll.
  • the work rolls contact the belt during performance of the process, for example, the first work roll is in contact with the top of the belt and the second work roll is in contact with the bottom of the belt.
  • At least one of the work rolls has a structured surface.
  • a cold roll pass is made with the roll stand.
  • a lubricant is used in rolling in the roll stand.
  • the two work rolls are used axially parallel.
  • the axes of rotation are then parallel to one another and together with perpendicular to the axes of rotation arranged connecting lines between the axes of rotation of the outlet plane of the roll gap.
  • the strip is guided via a control roller into the nip of the roll stand.
  • the entry angle ⁇ is changed, thereby controlling the embossing of the surface structure on the belt.
  • a change in the entry angle ⁇ via the positioning of a control roller is a simple and process-reliable way of controlling the surface structure of the strip in an embossing roll pass.
  • the roll pass can be adjusted with respect to the desired surface structure via a change in the entry angle ⁇ , without the rolling stand being changed or other devices located in front of the rolling stand, such as run-out rolls, having to be adjusted specifically for a change in the entry angle ⁇ .
  • the roll pattern can be kept uniform by regulating the entry angle ⁇ through the control roller.
  • simple work rolls without a bending device can be used to change the rolled section.
  • two work rolls with unequal surface roughness can be used to make a tape with equal surface roughness on both sides.
  • a positionable control roller can be retrofitted into an existing rolling mill and thus the range of application of the existing rolling train can be easily expanded.
  • the hydrodynamic intake is the dominant contribution to the lubricant intake. This is dependent on the contact angle between the surface of the respective work roll with the surface of the belt.
  • the inlet angle ⁇ of the contact angle of the work roll and thus the hydrodynamic lubricant intake can be changed.
  • by changing the angle of entry influence on the rolling pattern of the top and bottom of the tape can be taken, for example, to achieve a uniform rolling pattern on both sides and to respond to different surface structures and different wear of the surface structure of the two work rolls.
  • ⁇ h the difference between the thickness of the strip before rolling and the thickness of the strip after rolling in mm (reduction in the number of passes)
  • DW the diameter of the working roll (2, 4) in mm.
  • an entry angle ⁇ greater than the gripping angle ⁇ arccos [1- ( ⁇ h / Dw)] of a work roll is set, where ⁇ h is the difference between the thickness of the strip before rolling and the thickness of the strip after Rolls in mm (reduction of stitches) and Dw is the diameter of the work roll in mm.
  • embossing rolls are usually smaller Stichstrance .DELTA.h provided, whereby the gripping angle ⁇ is correspondingly small.
  • the rolling image changes when changing the entry angle ⁇ only on a first side of the strip, since the other side is in contact with the work roll with a contact angle above the gripping angle.
  • the rolling image of the second side of the band can be adjusted virtually independently of the first page via a change in the feed angle ⁇ . Consequently, in this embodiment, in particular, a uniform rolling pattern can be provided on both sides of the belt with a simplified control.
  • the entry angle ⁇ is changed in 0.1 ° increments, particularly preferably in 0.05 ° increments, so that a very precise influencing of the surface roughness of the top and bottom of the band can take place.
  • the surface topography of rolled strips is mainly dependent on the surfaces of the work rolls. However, the surface roughness of the two work rolls may be different.
  • the properties of a surface topography can be determined by different characteristics.
  • one-dimensional profiles Z (x) are measured by linear scanning in various places on the surface and the corresponding value R a is determined.
  • the value for S a results from a two-dimensional measurement of the surface, ie the topography Z (x, y).
  • the roughness R a or S a of the surfaces of the work rolls may, for example, in the range of at least 0.1 microns to a maximum of 10.0 microns, preferably at least 0.4 microns to a maximum of 4.0 microns, more preferably at least 0.6 microns to maximum 3.0 microns.
  • the difference in the roughness Ra or Sa of the surfaces of the work rolls can amount to more than 0.1 ⁇ m, in particular more than 0.3 ⁇ m, in particular in connection with an entry angle ⁇ . It is also conceivable that a structured surface is introduced only in one of the work rolls.
  • the entry angle ⁇ can be adjusted so that the contact angle between the less rough work roll and the band is above the gripping angle ⁇ and thus this side of the band with one of the further change of Angle of entry ⁇ virtually independent Walzsent experiences.
  • the running angle ⁇ can then be used to control the rolling pattern of the side of the belt which is in contact with the rougher work roll.
  • At least one discharge roller is used, which passes through the belt in front of the control roller.
  • a drainage roller or an arrangement of a plurality of drainage rollers serves to guide the belt and to regulate the belt tension, wherein the belt in particular passes through a plurality of drain rollers and is alternately bent between them.
  • at least one discharge roller offers the possibility of presetting the entry angle ⁇ , so that the entry angle ⁇ can be set in very small angular steps via the control roller and at the same time the at least one discharge roller ensures that the control roller has sufficient traction and surface damage can be avoided on the tape.
  • the at least one discharge roller is positioned so that an inlet angle ⁇ B is set via the at least one discharge roller when the control roller does not touch the belt and an entry angle ⁇ is set by the positioning of the control roller, the difference between the Entry angles ⁇ and ⁇ B is at least 0.5 °, preferably 1.0 °.
  • an approximately horizontal pass line is assumed below, wherein a negative entry angle ⁇ represents an entry of the strip from a position above the pass line and a positive entry angle ⁇ an entry of the strip from a position below the pass line ,
  • the at least one idler roller is positioned to set an entrance angle ⁇ B.
  • a control roller is above the tape, ie, the control roller is then positioned to contact the top of the tape. It can now be set with the control roller, which is located between the drain roller and the roll stand, an inlet angle ⁇ become. If the difference between the entry angles ⁇ and ⁇ B is at least 0.5 °, preferably 1.0 °, the control roller has sufficient traction on the belt to prevent slippage between the belt and the control roller. Thus, unwanted grinding or scratching effects are avoided by the control roller on the surface of the belt.
  • a duo rolling stand is used as the rolling stand.
  • Duo rolling stands are simple in construction and correspondingly economical. By using a control roller in front of the duo rolling stand, the rolling pattern on the belt can be controlled sufficiently well by the control roller despite the low gripping angle. It can therefore be dispensed with more complicated, maintenance-intensive and more expensive quarto and six-high rolling stands.
  • a rolling stand with two identical work rolls is used.
  • the work rolls can be designed the same in terms of diameter and length, but not necessarily have the same structured surface, for example, profiles with the same roughness.
  • the work rolls are easily replaceable since only one type of work roll needs to be provided.
  • Any inequalities in the embossing on the belt can be compensated by the method according to the invention via a change in the inlet angle ⁇ . This can also be compensated for quality variations in the preparation of the surfaces of the top and bottom rollers.
  • the surface roughness of at least one surface of the strip is controlled by the adjustment of the entry angle ⁇ by the positioning of the control roller during rolling in conjunction with a measurement of the surface roughness of the strip.
  • the inlet angle ⁇ can be changed via the positioning of the control roller, there is the possibility, even during the ongoing rolling operation, the inlet angle ⁇ and thus the rolling image via a positioning of the control roller influence.
  • the change in the entry angle ⁇ during rolling is determined by further process parameters, in particular measured values.
  • a measurement of the surface roughness of the incoming and / or outgoing band takes place, more preferably at the top and bottom of the band. In the case of measured changes or deviations in the surface roughness of the strip from a desired value, a uniform rolling pattern can thus be adjusted further via a change in the entry angle ⁇ .
  • the rolling stand and the control roller can be arranged inline or within a rolling mill with upstream cold and hot rolling stands.
  • the control roller allows flexible adaptation of the embossing roller stitch to the process parameters of the rolling train or the previous rolling passes.
  • an embossing roll pass with a relative change in the thickness of the strip (degree of reduction) of less than 10%, preferably 1 to 6%, is carried out. Due to the low degree of rolling off the embossing of the surface structure of the roller is improved because the stretch is kept low. At the same time, solidifications can be limited and thus the mechanical properties of the strip can be advantageously influenced.
  • the recupergewalzstich is performed with work rolls having a diameter of at least 200 mm to a maximum of 1200 mm.
  • a range for the surface roughness R a or S a of at least 0.1 microns to a maximum of 10.0 microns, preferably at least 0.4 microns to a maximum of 4.0 microns, more preferably at least 0.5 microns are set to a maximum of 2.0 microns. It has been found that the above-mentioned ranges for the roughness R a and S a are advantageous for the forming behavior of a sheet produced from the strip. Preferably, a structure with the same roughness is applied to both sides of the strip, ie with approximately the same values for R a or S a .
  • the roughness values of the belt can be monitored in particular during rolling by a measuring device.
  • a measuring device In this case, an optical measuring device is preferably used which allows non-contact measurement and has sufficient accuracy for the above-mentioned roughness values.
  • At least one work roll has an EDT surface structure or an EBT surface structure.
  • An electrical discharge texturing (EDT) surface structure allows a high number of peaks in the surface profile.
  • EBT Electron Beam Texturing
  • well distributed wells can be provided in the surface.
  • Surface structures produced by both methods in the work rolls are well suited for embossing.
  • SBT shot blasting texturing
  • a structured chromium layer as a surface structure or a laser-textured surface.
  • a band consisting of aluminum or an aluminum alloy is used.
  • an aluminum alloy of the type AA5xxx or AA6xxx is used.
  • Other preferred types of aluminum alloys are AA6014, AA6016, AA6022, AA6111 or AA6060 and AA5005, AA5005A, AA5754 or AA5182.
  • the alloys mentioned are well suited for applications with high deformation requirements and high strength at the same time.
  • the forming properties of the strips produced from the alloys can be further improved by the method according to the invention.
  • a device for rolling a strip in particular for carrying out the method according to the invention, in that a control roll is arranged in the strip running direction in front of the nip of the rolling stand and means for positioning the control roller relative to the pass line of the belt.
  • the entry angle ⁇ can be changed and thus the embossing of the surface structure on the belt can be controlled.
  • a change in the entry angle ⁇ via means for positioning the control roller is a simple and reliable way to control the surface structure of a strip in a recupergewalzstich.
  • the embossing pass stitch can be adjusted with respect to the desired surface structure via a change in the entry angle ⁇ without the mill stand being changed, in particular without the work rolls having to be exchanged.
  • the rolling pattern can be kept uniform by changing the entrance angle ⁇ via the control roller.
  • simple work rolls without a bending device can be used to change the rolled section.
  • At least one drainage roller is provided in the strip running direction in front of the control roller.
  • at least one feed roller provides more possibilities and variability of the tape run for changing the entry angle ⁇ .
  • means are provided for positioning the at least one discharge roller relative to the pass line.
  • the at least one discharge roller can also be positioned largely independently of the desired entry angle ⁇ , since the entry angle ⁇ can be set decisively by the means for positioning the control roller.
  • means for positioning the work rolls or for changing the pass line can also be provided, which further increases the variability of the device in relation to the strip run and the entry angle ⁇ .
  • the means for positioning the control roller allow an entry angle ⁇ between +/- 10 °, +/- 5 °, +/- 3 ° or preferably at most between +/- 2 ⁇ .
  • the control roller in 0.1 ° increments, more preferably in 0.05 ° increments of the entry angle ⁇ can be changed in position, so that a very precise influence on the surface roughness of the top and bottom of the tape can be done. This has proved to be advantageous, in particular in conjunction with only Duo crushers providing small gripping angles.
  • Said angle range +/- 10 °, +/- 5 ° or +/- 3 ° for the entry angle ⁇ allows a sufficient adjustment range for influencing the surface structure of the belt.
  • a duo rolling stand is provided as the rolling stand, in particular a duo rolling stand with two work rolls of the same diameter. Due to the control roller in front of the duo rolling stand, the rolling pattern on the belt can be controlled by the means for adjusting the control roller even at small gripping angles. More complicated, more maintenance-intensive and more expensive four-high and six-high stands can be dispensed with.
  • At least one measuring device is provided for measuring the surface roughness of at least one surface of the strip.
  • an optical measuring device is preferably used which allows non-contact measurement and has sufficient accuracy for the above-mentioned roughness values.
  • the measuring device can be arranged downstream of the roll stand in the strip running direction in order to measure the rolling pattern of the embossing roll stitch.
  • At least one control means is provided, via which the positioning of the control roller, optionally the positioning of the at least one discharge roller, can be regulated as a function of the measurement of the surface roughness of the at least one surface of the belt.
  • the control means can evaluate the measured surface roughness and change the inlet angle ⁇ via a positioning of the control roller.
  • the rolling pattern can be monitored and regulated during the rolling operation.
  • Fig. 1a shows a first schematic view of the geometry during rolling.
  • a nip is formed through which a pass line 6 is given.
  • the pass line 6 passes through the neutral phase of the belt and is perpendicular to the connection plane of the axes of rotation of the rollers 2 and 4.
  • ⁇ h is the difference between the thickness of the belt 8 before rolling and the thickness of the belt 8 'after rolling in mm (dropping).
  • the work rolls 2, 4 are under a gripping angle ⁇ in contact with the tape.
  • the gripping angle ⁇ is the angle between the line connecting the two axes of the work rolls 2, 4 to the line connecting an axis to the contact point to the surface of the strip.
  • the diameters Dw of the work rolls 2, 4 are identical and thus have the same gripping angle ⁇ .
  • the contact angle between the surface of the belt 8 and the tangent of the surface of both work rolls 2, 4 equal to the gripping angle ⁇ .
  • Fig. 1b shows a second schematic view of the geometry during rolling, wherein there is an entry angle ⁇ ⁇ 0 ° between the course of the belt 8 and the pass line. This one is in Fig. 1b drawn between the pass line 6 and the center line 10 of the belt 8.
  • the entrance angle ⁇ ⁇ 0 ° has the effect that the contact angle between the surface of the belt 8 and the tangent of the surface of the work rolls 2, 4 is different for both sides.
  • the upper work roll 2 has a contact angle of ⁇ + ⁇ and the lower work roll 4 has a contact angle of ⁇ - ⁇ .
  • Fig. 2a shows a first schematic view of the method and the device according to the invention.
  • a rolling stand is shown here in simplified form by the work rolls 2, 4, wherein at least one of the work rolls 2, 4 has a structured surface.
  • a control roller 12 is arranged with means for positioning relative to the pass line 6. Further in front of tape running direction at least one discharge roller 14 is provided.
  • Fig. 2a the control roller 12 is positioned so that the control roller 12 does not touch the belt 8.
  • Fig. 1a both contact angles of the work rolls 2, 4 to the surface of the belt 8 are equal to the gripping angle ⁇ .
  • the contact angle of the work rolls 2, 4 and thus in particular the hydrodynamic lubricant intake of the respective work roll 2, 4 can be changed.
  • the Lead-in angle ⁇ on the means for positioning the control roller 12 so that the rolling pattern of the top and bottom of the belt 8 'and the surface texture of the rolled strip 8' can be controlled.
  • Fig. 2c shows in a further schematic view of a further embodiment of the method according to the invention or the device according to the invention.
  • means are also provided for positioning the at least one discharge roller 14 relative to the pass line 6.
  • the at least one discharge roller 14 is positioned so that an entry angle ⁇ B would be set without touching the control roller 12 with the belt 8.
  • an inlet angle ⁇ is set, wherein the difference between the inlet angles ⁇ and ⁇ B is at least 0.5 °, preferably 1.0 °.
  • control roller 12 and drain roller 14 With such a positioning of the control roller 12 and drain roller 14 it is ensured that the control roller 12 has enough traction on the belt 8 to prevent slippage between the belt 8 and the control roller 12. Consequently, undesirable grinding or scratching effects by the control roller 12 on the surface of the belt 8 are avoided.
  • Fig. 2d shows in a further schematic view of a further embodiment of the method according to the invention or the device according to the invention.
  • a measuring device 16 for measuring the surface roughness of at least one surface of the belt 8 ' is provided.
  • the measuring device 16 can pass the measured values to a control means 18.
  • the control means 18 influences the means for positioning the control roller 12 on the basis of the measured values of the measuring device 16.
  • the control means 18 can thus be used to control the surface roughness of the belt 8 'during rolling.
  • control means 18 may also control the means for positioning the at least one run roller 14.
  • Fig. 3 shows measured center roughness values S a as a function of the entry angle ⁇ from a test series.
  • an aluminum alloy strip of the alloy type AA6016 with a thickness of 2.4 mm was rolled in a rolling stand.
  • the gripping angle ⁇ of the embossing stand was about 1.3 ° in the experiments.
  • Fig. 4 shows surface topographies of the top and bottom rolled strips according to the invention as a function of the inlet angle ⁇ from the same series of experiments as in Fig. 3 shown.
  • the control roller can be used to reliably set the same roughness on both sides of the belt.

Claims (15)

  1. Procédé de gaufrage d'une bande
    - avec une cage de laminoir possédant un premier rouleau de travail (2) et un deuxième rouleau de travail (4), une fente de roulement avec une ligne d'alignement étant définie entre le premier rouleau de travail (2) et le deuxième rouleau de travail (4),
    - un rouleau de commande (12) étant disposé dans le sens du laminage avant la fente de roulement avant les rouleaux de travail,
    - la bande (8) étant guidée dans la fente de roulement de la cage de laminoir par le biais du rouleau de commande (12) sous un angle d'entrée β par rapport à la ligne d'alignement (6) et
    - l'application par gaufrage de la structure de surface du rouleau de travail sur la bande (8') étant commandée par la sélection de l'angle d'entrée β en fonction du positionnement du rouleau de commande (12) par rapport à la ligne d'alignement,
    - un angle d'entrée β dans une plage de réglage de +/- 2α étant réglé, α désignant l'angle de prise d'un rouleau de travail (2, 4) dans une passe de laminage donnée pour lequel s'applique la règle suivante: α = arccos 1 − Δh / Dw ,
    Figure imgb0007
     où Δh désigne la différence entre l'épaisseur de la bande avant le laminage et l'épaisseur de la bande après le laminage en mm (réduction de passe) et Dw le diamètre des rouleaux de travail (2, 4) en mm.
  2. Procédé selon la revendication 1, caractérisé en ce qu'au moins un rouleau de déroulement (14) est utilisé, que traverse la bande (8) avant le rouleau de commande (12).
  3. Procédé selon la revendication 2, caractérisé en ce que
    - l'au moins un rouleau de déroulement (14) est positionné de telle sorte qu'un angle d'entrée βB est réglé par le biais de l'au moins un rouleau de déroulement (14) lorsque le rouleau de commande (12) n'est pas en contact avec la bande - (8) et
    - un angle d'entrée β est réglé par le positionnement du rouleau de commande (12), de sorte que la différence entre les angles d'entrée β et βB est au minimum de 0,5°, de préférence au minimum de 1,0°.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la cage de laminoir utilisée est une cage de laminoir duo, notamment une cage de laminoir duo avec deux rouleaux de travail (2, 4) identiques.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la rugosité de surface d'au moins une surface de la bande (8') est régulée par le biais du positionnement du rouleau de commande (12) pendant le laminage en association avec une mesure de la rugosité de surface de la bande (8').
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'une modification relative de l'épaisseur de la bande (8, 8') (degré de laminage) de moins de 10 %, de préférence de 1-6 %, est effectuée pendant le passe de laminage.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'une plage pour la rugosité de surface Ra ou Sa d'au moins 0,1 µm à un maximum de 10,0 µm, de préférence d'au moins 0,4 µm à un maximum de 4,0 µm, notamment de préférence d'au moins 0,5 µm à un maximum de 2,0 µm, peut être réglée sur au moins une surface de la bande (8') par le biais d'un positionnement du rouleau de commande (12).
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'au moins un rouleau de travail (2, 4) possède une structure de surface EDT, une structure de surface EBT, une couche de chrome structurée ou une surface texturée par laser.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'une bande (8) composée d'aluminium ou d'un alliage d'aluminium est utilisée, notamment un alliage d'aluminium de type AA5xxx ou AA6xxx.
  10. Dispositif de gaufrage d'une bande, notamment pour mettre en oeuvre un procédé selon l'une des revendications 1 à 9,
    - avec une cage de laminoir possédant un premier rouleau de travail (2) et un deuxième rouleau de travail (4), une fente de roulement avec une ligne d'alignement (6) étant définie entre le premier -rouleau de travail (2) et le deuxième rouleau de travail (4),
    - un rouleau de commande (12) est disposé dans le sens de défilement de la bande avant la fente de roulement de la cage de laminoir,
    - des moyens de positionnement du rouleau de commande (12) par rapport à la ligne d'alignement (6) sont présents,
    les moyens de positionnement du rouleau de commande (12) permettant un réglage de l'angle d'entrée β dans une plage entre +/- 10° ou +/- 5°, de préférence entre +/- 3°, la position du rouleau de commande (12) peut être modifiée par pas de 0,1°, notamment de préférence par pas de 0,05° de l'angle d'entrée β.
  11. Dispositif selon la revendication 10, caractérisé en ce qu'au moins un rouleau de déroulement (14) se trouve avant le rouleau de commande (12) dans le sens de défilement de la bande.
  12. Dispositif selon la revendication 11, caractérisé en ce que des moyens de positionnement de l'au moins un rouleau de déroulement (14) par rapport à la ligne d'alignement sont présents.
  13. Dispositif selon l'une des revendications 10 à 12, caractérisé en ce que la cage de laminoir utilisée est une cage de laminoir duo, notamment une cage de laminoir avec deux rouleaux de travail (2, 4) identiques.
  14. Dispositif selon l'une des revendications 10 à 13, caractérisé en ce qu'au moins un dispositif de mesure destiné à mesurer la rugosité de surface d'au moins une surface de la bande (8') est présent.
  15. Dispositif selon la revendication 14, caractérisé en ce qu'au moins un moyen de régulation est présent, par le biais duquel peut être régulé le positionnement du rouleau de commande (12), en option le positionnement de l'au moins un rouleau de déroulement (14), en fonction de la mesure de la rugosité de surface de l'au moins une surface de la bande (8').
EP16701520.5A 2015-02-04 2016-01-26 Méthode et dispositif pour le gaufrage par laminage d' une bande Active EP3253505B1 (fr)

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PCT/EP2016/051556 WO2016124447A1 (fr) 2015-02-04 2016-01-26 Procédé et dispositif de gaufrage d'une bande

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DE102021125889A1 (de) * 2021-10-06 2023-04-06 Thyssenkrupp Steel Europe Ag Verfahren zum Dressieren eines Stahlblechs, dressiertes Stahlblech und daraus hergestelltes Bauteil

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DE102015101580B3 (de) 2016-06-02
KR102046588B1 (ko) 2019-11-19
CN113732063A (zh) 2021-12-03
JP6452212B2 (ja) 2019-01-16
US10751773B2 (en) 2020-08-25
CN107995881A (zh) 2018-05-04
WO2016124447A1 (fr) 2016-08-11

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