EP4008446A1 - Procédé de texturisation de surface des rouleaux - Google Patents

Procédé de texturisation de surface des rouleaux Download PDF

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Publication number
EP4008446A1
EP4008446A1 EP21210996.1A EP21210996A EP4008446A1 EP 4008446 A1 EP4008446 A1 EP 4008446A1 EP 21210996 A EP21210996 A EP 21210996A EP 4008446 A1 EP4008446 A1 EP 4008446A1
Authority
EP
European Patent Office
Prior art keywords
distribution
autocorrelation
depressions
metal product
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21210996.1A
Other languages
German (de)
English (en)
Inventor
Dr. Martin Koch
Karl-Heinz Kopplin
Stefan Wischmann
Folkert Schulze-Kraasch
Benjamin LAUER
Felix Pfützenreuter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP4008446A1 publication Critical patent/EP4008446A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • 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
    • 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
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface

Definitions

  • the present invention is based on the surface texturing of rolls, in particular skin-pass rolls, for processing metal products such as flat steel products, preferably steel strip or sheet steel.
  • the surface texturing of rolls is state of the art.
  • texturing methods are shot peening (SBT), electric spark discharge (EDT), chrome plating (ECD), and laser or electron beam bombardment (LT or EBT).
  • SBT, EDT and ECD are so-called stochastic methods in which the surface structures are randomly arranged in the area. With the ECD process, hemispherical elevations with different radii are created on the roll surface. With SBT and EDT, surface structures in the form of craters are introduced into the roller and the crater edges can be brought to a defined level, for example by fine grinding.
  • the EDT process preferably with a so-called super finish, provides a particularly advantageous roller surface.
  • LT and EBT are so-called deterministic methods that offer the possibility of adjusting the lateral position and topographical shape of the surface structures in a targeted or directed manner by means of electron or laser beam bombardment. With a regular sequence of surface structures, these are essentially direction-dependent and therefore anisotropic. If deterministic methods are controlled in particular by means of a mathematical random number generator, then one speaks of a pseudo-stochastic surface structure.
  • the decision on the texturing process depends on the requirements and the procedural boundary conditions during production. If metal products are to be machined which require a high level of roughness, particularly for forming processes, but the mechanical properties of the metal flat products only allow a low degree of skin pass, then skin pass rolls with a high degree of roughness transfer are advantageous. For a lower roughness despite high rolling forces, skin-pass rolls with a low transfer are required.
  • a stochastic roller surface with closed and open surface structures behaves differently than a deterministic roller surface with only open or only closed surface structures.
  • the selection of the roller surface depends on the outlined boundary conditions.
  • the advantage of the EDT texturing process compared to SBT or ECD, for example, is that the spark discharge takes place where no spark jumps have taken place before. After a sufficient texturing time, a gap-free, essentially homogeneous roll surface structure is formed.
  • a stochastic texturing method which, due to the method, does not perform any feedback, control or influencing of the point density, for example SBT or ECD, local inhomogeneities can form.
  • Something similar can be observed in the generation of pseudo-stochastic texturing by means of deterministically controllable structure generation, for example LT or EBT.
  • the invention is therefore based on the technical object of providing a method for surface texturing of rolls for conditioning surfaces of metal products which does not have the disadvantages of the prior art described, but rather the formation of connected areas without depressions or areas with connected ones depressions reduced.
  • This object is achieved by a method for surface texturing of rolls, depressions being introduced into a surface of the roll, the depressions being arranged in a pseudo-stochastic distribution on the surface, characterized in that the distribution is subject to the restriction that an autocorrelation of the distribution has a regular pattern is constructed numerically.
  • the method according to the invention enables pseudo-stochastic texturing of the surface, so that a surface of a metal product that has been rolled with the textured roll and conditioned as a result has the advantages of a stochastic roughness topography.
  • the formation of connected areas without indentations or areas with connected indentations can be significantly reduced.
  • Pseudo-stochastically distributed in the context of the present invention means that the distribution is not determined completely stochastically, ie randomly.
  • the distribution is constructed numerically under the constraint that an autocorrelation of the distribution has a regular pattern, allows good control of the pseudo-stochastic distribution. What is particularly advantageous about the restriction of the pseudo-stochastic distribution via the autocorrelation is that the creation of the distribution can thus be carried out in a computer-implemented manner.
  • the autocorrelation has a periodicity of 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m.
  • a very uniformly structured conditioning of metal products, for example, in particular of flat steel products, is possible with a roller that is textured in this way.
  • the distances between repeating structures are large enough that one can speak of an isotropic roughness topography within the meaning of the present invention.
  • an intensity of a first order of the autocorrelation has a maximum of one tenth of an intensity of a main maximum of the autocorrelation.
  • the lower the intensity of the first order compared to the main maximum the greater the scatter in the arrangement of the pits. If the intensity of the first order of the autocorrelation corresponds to a maximum of one tenth of the intensity of the main maximum of the autocorrelation, one can speak of a stochastic roughness topography within the meaning of the present invention.
  • Depressions can be introduced at least partially with different depths, the depths being introduced following a depth distribution, the depth distribution preferably being created numerically with the restriction that a first further autocorrelation of the depth distribution has a regular first further pattern. This enables a further improved pseudo-stochastic roughness topography.
  • Depth of an indentation within the meaning of the present invention is the greatest extent of the indentation on the roller in the direction of the axis of rotation of the roller. It is conceivable that the depressions have a depth profile.
  • a depth profile within the meaning of the present invention is an extension of the depression on the roller that changes parallel to the main extension plane of the surface of the roller in the direction of the axis of rotation of the roller.
  • the first further autocorrelation has a periodicity of 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m and/or wherein a first further intensity of a first order of the first further autocorrelation has at most one tenth of an intensity of a main maximum of the first further autocorrelation.
  • Indentations can be made at least partially with different widths and/or with different lengths arranged orthogonally to the respective widths, with the widths being introduced following a width distribution and/or with the lengths being introduced following a length distribution, with the width distribution and/or the length distribution is preferably created numerically with the restriction that it has a second further autocorrelation of the width distribution or a regular second further pattern or a third further autocorrelation of the length distribution or a regular third further pattern.
  • a length of an indentation within the meaning of the present invention is the maximum extent of the indentation parallel to the main plane of extension of the surface of the roller.
  • a width of an indentation within the meaning of the present invention is the maximum extension of the indentation parallel to the main extension plane of the surface of the roller and orthogonal to the length of the indentation. It is conceivable that the indentations are made as I-shaped, oval, round, rectangular or square or as a combination thereof in relation to the main extension plane of the surface of the roller, in particular in the direction of the axis of rotation of the roller.
  • the second further autocorrelation has a periodicity of 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m and/or the third further autocorrelation has a periodicity of 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m and/or wherein a second further intensity of a first order of the second further autocorrelation has a maximum of one tenth of an intensity of a main maximum of the second further autocorrelation and/or wherein a third additional intensity of a first order of the third additional autocorrelation has a maximum of one tenth of an intensity of a main maximum of the third additional autocorrelation.
  • the distribution is checked for the presence of undesirably structured areas, with the distribution being recreated in the undesirably structured areas if undesirably structured areas are present becomes.
  • This advantageously ensures that no unfavorable stains are produced on a metal product which is rolled with the textured roll. Recreating the distribution within the undesirably textured areas requires little effort.
  • Undesirably structured areas can be, for example, contiguous areas without indentations, areas with contiguous indentations, or anisotropic areas.
  • indentations arranged to form structural elements are introduced in a stochastically distributed manner on the surface of the roller, the indentations being introduced between the structural elements.
  • This allows functional texturing of the surface of a metal product rolled with the textured roll while retaining the benefits of stochastic roughness topography. It is conceivable, for example, that the structural elements serve to roll lubricant pockets into the metal product to transport lubricant during the forming process.
  • the depressions are introduced by means of a laser texturing method or with the aid of a particle beam.
  • Laser texturing methods and texturing methods using a particle beam can be controlled very well and produce excellent results.
  • the particle beam is an electron beam and/or an ion beam.
  • a further object of the present invention for solving the problem set at the outset is a roll, in particular skin-pass roll, wherein the roll has a surface textured using a method according to one of the preceding claims.
  • a further object of the present invention for solving the task set out in the beginning is a metal product, wherein the metal product is processed with a roller according to the invention.
  • a further object of the present invention for solving the problem set at the beginning is a surface of a metal product, in particular the surface of the metal product, which is processed with a roller according to the invention, elevations and/or depressions being arranged in a pseudo-stochastic distribution on the surface of the metal product are, wherein the depressions at least partially with different depths and/or elevations are at least partially introduced with different heights, the depths being introduced following a depth distribution and/or the heights following a height distribution, the depth distribution and/or the height distribution being preferred with the restriction that an autocorrelation of the depth distribution and/or Height distribution a regular further pattern with a periodicity of 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m and/or wherein an intensity of a first order of the autocorrelation is at most one tenth of an intensity of a main maximum of the autocorrelation having.
  • Depth of an indentation in the sense of the present invention is the greatest extension of the indentation on the surface in the thickness direction of the metal product. It is conceivable that the depressions have a depth profile.
  • a depth gradient within the meaning of the present invention is an extension of the depression on the surface in the thickness direction of the metal product that changes parallel to the main extension plane of the surface of the metal product.
  • Depressions on the surface of the metal product can be made at least partially with different widths and/or with different lengths arranged orthogonally to the respective widths, the widths being made according to a width distribution and/or the lengths being made according to a length distribution, wherein the width distribution and/or the length distribution are preferably introduced with the restriction that the width distribution has a second autocorrelation or a regular second pattern or a third autocorrelation of the length distribution or a regular third pattern.
  • a length of an indentation within the meaning of the present invention is the maximum extension of the indentation parallel to the main extension plane of the surface of the metal product, for example transverse to the rolling direction or transverse to the skin-passing direction.
  • a width of an indentation within the meaning of the present invention is the maximum extent of the indentation parallel to the main extension plane of the surface of the metal product and orthogonal to the length of the indentation, for example in the rolling direction or skin-passing direction.
  • the length of the indentation can also run in the rolling direction/skin-passing direction and the width of the indentation can thus run transversely to the rolling direction/skin-passing direction.
  • elevations are at least partially introduced on the surface of the metal product with different widths and/or with different lengths arranged orthogonally to the respective widths, with the widths being introduced according to a width distribution and/or with the Lengths are introduced following a length distribution, the width distribution and/or the length distribution preferably being introduced with the restriction that a fourth autocorrelation of the width distribution or a regular fourth pattern or a fifth autocorrelation of the length distribution or a regular fifth pattern is introduced .
  • a length of an elevation within the meaning of the present invention is the maximum extension of the elevation parallel to the main extension plane of the surface of the metal product, for example in the rolling direction/skin-passing direction or alternatively transversely to the rolling/skin-passing direction.
  • a width of an elevation within the meaning of the present invention is the maximum extent of the elevation parallel to the main extension plane of the surface of the metal product and orthogonal to the length of the elevation, thus for example transverse to the rolling direction/skin-passing direction or alternatively in the rolling/skin-passing direction.
  • FIG 1 Figure 12 shows the distribution and autocorrelation of a method according to an exemplary embodiment of the present invention.
  • figure 2 shows schematically a section through part of a roll according to an exemplary embodiment of the present invention.
  • FIG. 12 schematically shows two rolls according to an exemplary embodiment of the present invention and a metal product according to an exemplary embodiment of the present invention.
  • FIG 1 the distribution 2 and the autocorrelation 3 of a method according to an exemplary embodiment of the present invention are shown.
  • the aim of the method is to cover the surface 11 of a roller 10 (see figures 2 and 3 ), preferably a skin-pass roller, with indentations 1 so that when rolling/skin-passing a metal product 100 (see figure 3 ) a structure which has elevations and/or depressions in the surface of the metal product 100, which has the advantages of a pseudo-stochastic roughness topography, while reducing the risk of developing continuous areas without pits or areas with continuous pits.
  • the indentations 1 are made in a pseudo-stochastic distribution 2 on the surface 11 of the roller 10 .
  • the distribution 2 is created numerically, that is to say in the exemplary embodiment illustrated here that the distribution is not determined completely stochastically and that the autocorrelation 3 of the distribution 2 has a regular pattern.
  • the main maximum 6 and the periodically arranged first-order maxima 5 can be clearly seen in the autocorrelation 3 .
  • the first-order maxima 5 have an intensity of less than a tenth of the intensity of the main maximum 6 .
  • the periodicity 4 of the arrangement of the maxima 5, 6 is between 2 ⁇ m and 1000 ⁇ m, for example.
  • the limitation of the pseudo-stochastic determination of distribution 2 means that distribution 2 is very uniform and isotropic, but has no spots, ie large areas without depressions or large areas with connected depressions.
  • FIG 2 a section through part of a roll 10 according to an exemplary embodiment of the present invention is shown schematically.
  • the section shown intersects the axis of rotation (not shown) of the roller 10.
  • the surface 11 of the roller 10, which has two structural elements 7, can be seen.
  • the structural elements 7 are designed as top-hat profiles.
  • the depressions 1 are arranged pseudo-stochastically between the structural elements 7 . It can be clearly seen that not only does the arrangement of the depressions 1 follow the pseudo-stochastic distribution, but that the depressions 1 each have different depths and widths, which are each arranged according to a distribution, here also pseudo-stochastic.
  • the distributions of the depths and the widths each have autocorrelations with a periodicity between, for example, 2 ⁇ m and 1000 ⁇ m.
  • the intensities of the first-order maxima of the depth and width distributions are less than a tenth of the intensity of the respective main maxima.
  • FIG 3 1 are schematically two rolls 10 according to an exemplary embodiment of the present invention and a metal product 100 according to an exemplary embodiment of the present invention.
  • the surfaces 11 of the rolls 10 are textured with a method according to an exemplary embodiment of the present invention.
  • the surface of the metal product (100) is not shown, elevations and/or depressions being arranged in a pseudo-stochastic distribution on the surface of the metal product (100), the depressions at least partially having different depths and/or elevations at least partially having different depths Heights are introduced, the depths following a depth distribution and/or the heights following a height distribution, the depth distribution and/or the height distribution preferably being subject to the restriction that an autocorrelation of the depth distribution and/or height distribution is a regular further pattern with a periodicity from 2 ⁇ m to 3000 ⁇ m, in particular from 5 ⁇ m to 2000 ⁇ m, preferably from 10 ⁇ m to 1000 ⁇ m and/or an intensity of a first order of the autocorrelation has at most one tenth of an intensity of a main maximum of the autocorrelation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Metal Rolling (AREA)
EP21210996.1A 2020-12-03 2021-11-29 Procédé de texturisation de surface des rouleaux Pending EP4008446A1 (fr)

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DE102020021524 2020-12-03

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EP4008446A1 true EP4008446A1 (fr) 2022-06-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024120964A1 (fr) * 2022-12-08 2024-06-13 Thyssenkrupp Steel Europe Ag Cylindre de travail à texture déterministe destiné à être utilisé dans un laminoir à froid, procédé de production d'un cylindre de travail à texture déterministe destiné à être utilisé dans un laminoir à froid, et laminoir à froid

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529429A1 (de) * 1995-08-10 1997-02-13 Thyssen Stahl Ag Feinblech, Walzwerkswalze für die Feinblechherstellung, Verfahren zur Oberflächenstrukturierung der Walzwerkswalze und ihre Verwendung
CN109175707A (zh) * 2018-09-10 2019-01-11 武汉武钢华工激光大型装备有限公司 激光无序毛化轧辊表面的方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529429A1 (de) * 1995-08-10 1997-02-13 Thyssen Stahl Ag Feinblech, Walzwerkswalze für die Feinblechherstellung, Verfahren zur Oberflächenstrukturierung der Walzwerkswalze und ihre Verwendung
CN109175707A (zh) * 2018-09-10 2019-01-11 武汉武钢华工激光大型装备有限公司 激光无序毛化轧辊表面的方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TOENSHOFF H K ET AL: "STRUKTURIEREN TECHNISCHER OBERFLAECHEN MITTELS LASERSTRAHLUNG. \LASERTEXTURING OF TECHNICAL SURFACES", LASER UND OPTOELEKTRONIK, FACHVERLAG GMBH. STUTTGART, DE, vol. 25, no. 2, 1 April 1993 (1993-04-01), pages 56 - 61, XP000387818, ISSN: 0722-9003 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024120964A1 (fr) * 2022-12-08 2024-06-13 Thyssenkrupp Steel Europe Ag Cylindre de travail à texture déterministe destiné à être utilisé dans un laminoir à froid, procédé de production d'un cylindre de travail à texture déterministe destiné à être utilisé dans un laminoir à froid, et laminoir à froid

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