EP2006037B2 - Produit plat en métal, en particulier en acier, utilisation d'un tel produit plat tout comme presse et procédé de fabrication de tels produits plats - Google Patents

Produit plat en métal, en particulier en acier, utilisation d'un tel produit plat tout comme presse et procédé de fabrication de tels produits plats Download PDF

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Publication number
EP2006037B2
EP2006037B2 EP07110866.6A EP07110866A EP2006037B2 EP 2006037 B2 EP2006037 B2 EP 2006037B2 EP 07110866 A EP07110866 A EP 07110866A EP 2006037 B2 EP2006037 B2 EP 2006037B2
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EP
European Patent Office
Prior art keywords
flat product
topography
valleys
peaks
frequency
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.)
Active
Application number
EP07110866.6A
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German (de)
English (en)
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EP2006037A1 (fr
EP2006037B1 (fr
Inventor
Bodo Hesse
Karl-Heinz Kopplin
Folkert Schulze-Kraasch
Udo Schulokat
Hans-Gerd Weyen
Ingo Rogner
Torsten Herles
Roland Meier
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.)
Walzen-Service-Center GmbH
ThyssenKrupp Steel Europe AG
Original Assignee
Walzen-Service-Center GmbH
ThyssenKrupp Steel Europe AG
Walzen Service Center GmbH
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.)
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38668910&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2006037(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Walzen-Service-Center GmbH, ThyssenKrupp Steel Europe AG, Walzen Service Center GmbH filed Critical Walzen-Service-Center GmbH
Priority to EP07110866.6A priority Critical patent/EP2006037B2/fr
Priority to AT07110866T priority patent/ATE477065T1/de
Priority to SI200730398T priority patent/SI2006037T1/sl
Priority to DE502007004723T priority patent/DE502007004723D1/de
Priority to ES07110866T priority patent/ES2348815T3/es
Priority to PCT/EP2008/057873 priority patent/WO2009000771A1/fr
Priority to KR1020097025989A priority patent/KR101223214B1/ko
Priority to US12/663,809 priority patent/US8920938B2/en
Priority to CA2687869A priority patent/CA2687869C/fr
Priority to CN2008800213797A priority patent/CN101707928B/zh
Publication of EP2006037A1 publication Critical patent/EP2006037A1/fr
Publication of EP2006037B1 publication Critical patent/EP2006037B1/fr
Application granted granted Critical
Publication of EP2006037B2 publication Critical patent/EP2006037B2/fr
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    • 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
    • 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
    • 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
    • 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
    • B21B2267/00—Roll parameters
    • B21B2267/10—Roughness of roll surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12201—Width or thickness variation or marginal cuts repeating longitudinally
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12556—Organic component
    • Y10T428/12569—Synthetic resin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12993—Surface feature [e.g., rough, mirror]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Definitions

  • the invention relates to a flat product made of a metal material, in particular a steel material, an advantageous use and a roller that is particularly suitable for producing such a flat product, and a method for producing such flat products.
  • “Flat products” are understood to mean sheet metal made from a metal or a metal alloy, in particular fine sheet metal, or similarly constructed strips and other rolled products.
  • Components are produced from flat products of the type in question, which are then coated with one or more layers of lacquer in order to protect them against possible corrosion on the one hand and to optimize their visual appearance on the other.
  • the quality of the visual appearance is judged, among other things, by the extent to which the surface structure of the respective metal substrate affects the surface of the paint coating.
  • paint systems In practice, the requirements placed on the paint coating of bodywork components are met by applying multi-layer paint systems.
  • These paint systems generally include at least one so-called "filler layer", the task of which is, among other things, to level out any unevenness on the surface to be coated.
  • Another criterion when assessing the suitability of a metal flat product for the manufacture of bodywork components is its behavior during forming into the respective component. This is also decisively influenced by the surface structure of the respective flat product. For example, during deep-drawing, the indentations present on the surface of a metal sheet form pockets in which a lubricant applied to the sheet or given in the respective mold before forming can collect. The carrying capacity of the lubricating film formed by the respective lubricant depends directly on the design and distribution of these depressions.
  • the plateaus of the elevations should be about 2 - 10 ⁇ m above the bottoms of the valley areas between the elevations.
  • the combined proportion of the flat plateaus of the mountains and the flat areas of the mid-flat areas existing between the bottoms of the valleys and the mountain plateaus should be 20 - 90% of the total area.
  • the proportion of flat areas between the regularly arranged and circular elevations should cover at least 85% of the sheet surface, that the depth of the valleys surrounding the elevations should be at least 4 ⁇ m starting from the flat areas and a frequency analysis of the steel sheet surface geometry, the intensity of the wavelength components of the wavelengths ⁇ , which are in a range of 585 ⁇ m ⁇ ⁇ ⁇ 2730 ⁇ m, is a maximum of 0.6 ⁇ m 2 .
  • the metal sheets produced according to the two Japanese patent applications are said to leave an extremely lively impression when painted.
  • the requirements specified for this presuppose strictly deterministic surface structures.
  • the invention was based on the object of creating a flat product that offers optimized prerequisites for a paint coating that has an excellent appearance even with relatively low paint layer thicknesses in the finished painted state.
  • a preferred use of such a flat product, a roller that is particularly suitable for producing such a flat product, and a method for producing such a flat product should be specified.
  • flat products according to the invention can be used particularly for the production of components that should be provided with a layer of varnish.
  • Such a steel sheet can be coated, for example, with a zinc or a zinc-magnesium coating.
  • the criteria specified according to the invention can also be used for flat products made from other metals.
  • flat products according to the invention are suitable for the production of bodywork components. After they have been shaped, they can also be provided with a coat of paint using shortened painting processes, which meets the highest requirements for their external appearance on the respective component. It is particularly noteworthy that the surface structure of such a component specified according to the invention is so delicate that optically and technically flawless coating results can be achieved even with a layer structure of the coating that is greatly simplified compared to the prior art.
  • roller which is particularly suitable for the production of a flat product according to the invention, the object specified above is achieved according to the invention in claim 6 .
  • the invention in claim 7 provides a method that allows the reliable production of metallic flat products that can be formed in a simplified manner and coated with excellent results.
  • the invention is based on the finding that, taking into account the criteria specified according to the invention, a metal flat product with such a delicate, stochastic surface structure can be made available in a planned manner that it is only slightly visually perceptible, if at all, after a typical automotive paint application.
  • the change between the mountain plateaus and the valleys takes place via steep flanks.
  • the morphology of the sheet surface is practically independent of the actual depth of the valleys.
  • the morphology of the sheet surface of a metal flat product according to the invention is also independent of the skin-pass degree that is used when producing the sheet texture by skin-pass rolling.
  • the "empty volume" of the surface topography can be specifically estimated. From this estimation it can then be determined with high accuracy what minimum quantity of lubricant is required in practice in order to be able to form a flat product designed according to the invention with minimized forming forces and optimal preservation of the surface structure.
  • a roller with such a condition of its roller surface coming into contact with the respective flat product to be processed can be produced by forming a basic structure into the roller surface by means of a suitable texturing process known from practice.
  • One possible method of specifically adjusting the roughness of the temper rolls is texturing by means of spark erosion (Electro Discharge Texturing, EDT).
  • EDT Electro Discharge Texturing
  • the initial state before texturing the roller should be a smoothly ground roller surface. Indentations that are as close as possible to each other are introduced into this surface by spark erosion. The "bars" remaining between the indentations already have the desired same height due to the flat initial state.
  • a defined voltage is briefly applied between the electrode and the roller, if necessary periodically.
  • Charge carriers (ions) are accelerated out of an electrolyte towards the roll surface through the spark erosion channel. When they hit the roll surface, they loosen roll material and create an indentation. Typical diameters of the depressions are approximately 80 ⁇ m. The loosened and melted roll material is transported away via the electrode rinsing and is not able to reconnect to the roll surface due to the dielectric oil.
  • melted roller material accumulates again on the originally smooth ground surface during the texturing process.
  • This material can be removed in a manner that is also known per se by subjecting the textured roll surface to targeted machining, during which the peaks of the surface texture previously produced on the roll are removed to an exactly predetermined extent. In practice, such material removal can be accomplished, for example, by means of a fine grinding process.
  • the EDT process is particularly advantageous, since repeated texturing of areas that have already been textured is almost impossible.
  • the spark discharge most likely only takes place where the distance between the roller surface (usually the elevation) and the electrode is smallest and the electric field is therefore strongest and densest. In places where spark discharge has formed a depression further spark discharge is unlikely. This enables a high density of spark discharges and a correspondingly delicate roller surface texture.
  • the indentations are often "shot in with an overlap". If the surface is completely covered, there are now ridges at different heights.
  • Strip superfinishing is the current technology for optimizing the finishing of roll surfaces. Thanks to the infinitely adjustable supply of constantly new abrasives, an even and seamless finish is created over the entire surface. Only the highest points of the roller base material are ground off. The top web heights are then at an almost uniform level.
  • the SuperFinish can be used to create steep slope angles.
  • a flat product consisting of a metal material is first made available in which at least the surface to be provided with the surface topography according to the invention has an arithmetic mean roughness of max. 1.5 ⁇ m.
  • This flat product is then subjected to temper rolling, in which a roll designed according to claim 4 acts on the respective surface, so that a flat product is obtained whose surface topography satisfies the requirements of the invention.
  • the indentations which are introduced into the surface of the thin sheet by the tips of the roll surface during skin-passing, are as level as possible in order to reliably achieve the two-peak height distribution of the surface topography of the flat product prescribed according to the invention.
  • the surface of a flat product according to the invention is designed in such a way that, in a horizontal section through the topography with a maximum material area proportion of 80%, the empty volume below the cutting plane per measuring area is less than 0 .15 ml/m 2 .
  • the material volume per measurement area should be less than 0.15 ml/m 2 for a horizontal section through the topography with at least 20% material area above the section plane.
  • the void volume enclosed below a horizontal sectional plane with 20% material area proportion is at least 0.8 ml/m 2 .
  • the height distribution ( Figure 2b ) indicates the frequency with which a certain height value can be found in the surface topography. It is obtained by forming the difference ("derivation") from the material content curve, also known as the Abbott-Firestone curve (DIN EN ISO 4287) ( Figure 2a ).
  • the height scale is divided into discrete areas (so-called "classes").
  • the class width should be selected so finely that the height distribution can be reproduced with sufficient resolution.
  • a correspondingly only rough class width of z. B. 0.2 microns advantageous. Because of this, negligibly small local maxima and minima are suppressed.
  • a fine resolution e.g. 0.1 ⁇ m is advantageous, which should be three times smaller than the half-width of the maxima or minima (Nyquist -Theorem).
  • a line profile is shown as an example with its corresponding height distribution (at a small angle of inclination).
  • the distance between the two local maxima in the height distribution is labeled "T". Accordingly, "T/2" is half the distance.
  • the areal distribution of the topographic components can be described using a contour section.
  • a threshold operation a distinction is made as to whether a measuring point "z" is above or below a certain level (threshold z h ).
  • a binary pattern (“light”, “dark”) then arises accordingly, as in 4 shown.
  • the contour line results directly from the edges of the light-dark pattern. This means that more delicate surface structures have large contour lengths.
  • This characteristic value is similar to the peak number RPc according to DIN EN 10049, which, however, uses two threshold value operations (two height levels at a distance
  • 0.5 ⁇ m from the arithmetic mean value). However, both parameters do not provide complete information about the arrangement and size of the light-dark pattern.
  • a sheet metal flat product according to the invention is distinguished by a characteristic height distribution with two distinct maxima, which are also referred to here as peak and valley levels.
  • An excellent cutting level is the middle level between the peak and valley levels.
  • HWHM Half Width at Half Maximum
  • the frequency distribution of r min can be found here ( figure 5 ) can be approximately described by an asymmetric normal distribution. This means that the standard deviations ⁇ 1 and ⁇ 2 are different "to the right” and “to the left” of the maximum (most common value, also called “mode”). The most frequent value of the accumulation distribution does not necessarily have to coincide with the ordinate.
  • the distance of the mode from the ordinate is denoted here as "m”.
  • 3 ⁇ 1 - m and 3 ⁇ 2 + m are good measures for the left and right limits of r min in the frequency distribution. This means that more than 99.99% of the calculated r min values (with asymmetric normal distribution) are within these limits.
  • FIGS 6 to 9 are typical examples of the "height distributions” ( figures 6 , 7 ), “Distributions of height values in the area” ( Figures 8a (elevation plot),8b (line profile)) and an example of a typical distance mapping ( 9 ) played back.
  • Figure 8a shows the recorded surface in a height representation
  • Figure 8b represents the line profile corresponding to this representation.
  • the surface finish of a flat product according to the invention is characterized by indentations that are distributed very evenly and finely and have a clearly defined maximum depth in a surface that is otherwise as smooth as possible. These indentations serve as a lubricant reservoir during the forming of a metal sheet according to the invention into a component during tribological contact between the tool and the metal sheet. Particularly deep crater structures, which would only show an effect with a correspondingly strong leveling of the surface, are avoided in a flat product according to the invention, since they would only form superfluous lubricant sinks.
  • Possibilities for adjusting these tribological states are offered by an appropriate selection of the material pairing (such as coating of forming tools), lubricant and the process parameters (such as hold-down forces).
  • flat products with a surface quality according to the invention now allow forming processes to be adjusted in a more targeted manner.
  • a comparison of the ACTUAL and TARGET surface topographies of the flat product can be used to optimally set the process parameters. Critical formed parts in particular can be produced longer and with a lower failure rate.
  • the structural elements of the roughness fine shape act in particular as a reservoir for the lubricant (empty volume, 10 ) and thus enable its storage and distribution during the transformation. Due to the tool contact (surface pressure locally >300 MPa in some cases), the sheet metal surface topography is leveled during the forming process. This reduces the original void volume ( 10 ). Thus, the lubricant trapped in the topography is either compressed or displaced, and hydrostatic or hydrodynamic lubrication of the contact surface then occurs.
  • both open and closed empty spaces must be sufficiently filled with lubricant.
  • the wavescan DOI measuring device measures e.g. the following values:
  • DOI Distinction of Image, which means the sharpness of an image reflected by the paint), Shortwave (SW) and Longwave (LW) as well as the waviness parameters du, Wa, Wb, Wc, Wd and We.
  • Shortwave structures are best noticed at a distance of 40 cm. These structures (fine-grained, crinkled) are recorded with a shortwave (SW) parameter. 40 cm corresponds approximately to the distance between the eyes when washing a car by hand.
  • Long-wave structures can best be recognized at a distance of 3 m. These structures (orange peel skin, long wave) are recorded with the Longwave (LW) parameter. The distance of 3 m corresponds to the view in the exhibition room (showroom distance).
  • the wavescan-DOI device records an optical profile of the surface with a laser and a sensor. This is separated into wavelength ranges by mathematical filters. State of the art is the division into six waviness parameters: du ( ⁇ 0.1 mm, "dullness"), Wa (0.1-0.3 mm), Wb (0.3-1 mm), Wc (1-3 mm), Wd (3-10 mm) and We (10-30 mm).
  • the measuring range extends from 0 (smooth) to 100 (strong structure).
  • the determined values are dimensionless.
  • the measured values are plotted against the wavelength ranges, which results in a structure spectrum, as is shown for a high-quality surface in 12 is shown.
  • the invention is based on the finding that the quality of the painted surface can be positively influenced by a targeted setting of the surface structure. Structures of ⁇ 0.1 mm (du) produce a lower contrast of the painted surface due to light refraction. Structures from 0.1 to 1 mm (Wa, Wb) lead to disruption of the outlines of an image reflected in the paint.
  • An automotive finish that satisfies the usual requirements has a DOI value of at least 85.
  • the DOI value is in the range of 90-95. In the case of qualitatively good painting of a metal sheet according to the invention, this range can also be reached if a greatly reduced paint layer thickness (fillerless process) is set compared to the prior art. For example, DOI values of at least 94 were achieved for sheet metal coated according to the invention without a filler coating being required for this.
  • the gloss of an automobile paint finish is measured at an angle of 20° to the normal to the surface and, almost independently of DOI and waviness parameters, achieves the same high values for good and bad paint finishes.
  • the gloss mainly depends on the paint system and the paint process conditions and does not allow any conclusions to be drawn about a good or bad paint finish.
  • Textured sheet metal surfaces mainly affect the Wb value. This is typically the ripple parameter with the highest numerical value and should be as low as possible ( 13 ). For good finishes, the Wb value should be less than 30.
  • the condition of the sheet metal surface also has less of an influence on the Wa parameter. Very rough sheet metal can negatively influence the Wc and even Wd parameters. In the case of such flat products, the measured values obtained are too high and are more difficult to correct in terms of painting.
  • the coating can also influence the waviness parameters.
  • the clear coat or its application has an influence on the waviness values du (clear coat too milky, dry spraying of the clear coat), Wc, Wd (clear coat film thickness too low).
  • KTL and filler layers can increase the Wb value significantly if the application is rough or there is no sanding.
  • the Wc value is increased by sanding marks or dry spraying of the filler.
  • sheet metal to be painted should be used with an optimized texturing that is as constant as possible and specified within narrow tolerances.
  • the painting process, with its numerous parameters and options for intervention, must be kept as constant as possible by the OEM in order to achieve the same or very similar effect from body to body in terms of quality, color matching and, in the case of modern paints, in particular with effect pigments.
  • a low Wb value is an important factor in painted sheet metal, especially with regard to plastic add-on parts.
  • Plastic parts only have a very low roughness, so that very low Wb values and very flat structure spectra are obtained. This is particularly noticeable when plastic parts on the body that are painted too smooth are adjacent to a sheet metal surface that is painted too rough. When you look over the body, there is an "optical break" in the paintwork, which is not desired.
  • the waviness of the painted plastic components is adapted to the waviness of the painted sheet metal components by surface roughness or waviness already applied during the shaping injection molding.
  • the texturing of the sheet metal surface according to the invention offers the possibility of producing sheets with a lower Wb value after painting, which can be installed optically better next to painted plastic components.
  • so-called "piano finishes”. This means a reflective coating with a very good DOI value and very low waviness, which is based on a glossy black lacquered concert grand piano.
  • Such a finish can usually only be achieved by repeated sanding and painting.
  • a trend towards the use of large glass roofs can also be observed in luxury, upper and middle-class automobiles. These are e.g. Partly dark tinted and usually painted black on the edge to hide the adhesive from the back. Due to the extreme, reflective smoothness of a dark glass roof, it is particularly difficult here to paint the adjacent sheet metal components such as the roof frame or roof cover in a way that makes them look similar. This task can also be solved by using flat products according to the invention.
  • An ideal painting surface is flat and shows no roughness or bumps. This is technically difficult to achieve with sheet metal, since the surface usually has to be reshaped in order to obtain a component.
  • an oil holding capacity is required for the lubrication, but this requires a certain roughness/surface topography of the flat sheet.
  • the measured values determined for the paint appearance as a function of the surface topography are plotted for a sheet with too coarse texturing (dashed line), for a sheet with a standard texturing (dash-dotted line) and a sheet according to the invention (solid line). It can be seen that with unfavorable roughness texturing, the value for Wb increases sharply and thus causes poorer painting or increased sanding effort after KTL and filler painting. It is also clearly recognizable that the texturing according to the invention enables improved painting with reduced values for Wb for the forming process.
  • the coating forms the substrate, e.g. T. and builds on bumps.
  • the mutual dependence of sheet metal structure ⁇ -> paint structure is in 14 clarified.
  • the structural spectrum of the thin sheet according to the invention is in 15
  • the Wb value is slightly above the curve for a good automotive finish and shows lower values for the Wd value. This results from the paint structure chosen for the texturing according to the invention.
  • no filler approximately 35 ⁇ m layer thickness was applied at all. Neither was a special filler-free painting concept used instead, nor was the KTL layer sanded.
  • the sheet metal produced according to the invention shows a painting result which is comparable to a good automobile painting.
  • the texturing of a flat product according to the invention thus leads to a good coating result with good values for Wb and DOI even if the filler layer is omitted. At the same time, it lowers the value for the long waviness Wd compared to standard textures, which minimizes the formation of orange peel.
  • Sheets made according to the invention are therefore preferably suitable for the use of paint concepts in which the application of a filler and the regrinding of the filler layer are dispensed with.
  • the invention thus satisfies the need, particularly in the field of automobile construction, for sheet metal substrates which permit a shortened painting process while at the same time having excellent functional properties and appearance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Catalysts (AREA)
  • Coating With Molten Metal (AREA)
  • Laminated Bodies (AREA)

Claims (7)

  1. Produit plat en métal, en particulier en acier, avec une structure de surface stochastique, pour la surface duquel, sur une surface de base d'une grandeur d'au moins 0,8 x 0,8 mm2, après une élimination d'une inclinaison possible dans sa topographie, une filtration des fractions à hautes fréquences au moyen d'un filtre passe-bas de Gauss (λs = 10 µm) et une détection de la distribution de fréquence des valeurs supérieures avec une largeur de classe de 0,1 µm, s'applique ce qui suit:
    a) la distribution de fréquence des valeurs supérieures présente deux maxima prononcés, qui représentent les niveaux de pics / de creux de la surface.
    b) en considérant seulement les régions topographiques, qui présentent une inclinaison maximale de 5 ° par rapport à la surface de base orientée horizontalement, la distribution de fréquence des valeurs supérieures se décompose en au moins deux maxima principaux, locaux, les maxima locaux étant valables pour les pics d'une divergence standard (largeur) de 2 σ ≤ 2 µm et pour les creux d'une divergence standard de 2 σ ≤ 1 µm, approximativement distribués normalement.
    c) la fréquence des pics est plus grande que la fréquence des creux.
    d) le maximum principal supérieur, qui représente les pics, est aussi, simultanément, un maximum absolu.
    e) l'intervalle entre les maxima principaux de la distribution de fréquence des valeurs supérieures est de 1 µm à 5 µm.
    f) sur un plan, qui est situé exactement centralement entre un niveau de pic et un niveau de creux, la demi-largeur des creux respectivement des pics est de 40 µm, respectivement de 100 µm au maximum, au moins 99,99 % des points de mesure topographiques présentant, par rapport au bord des creux, respectivement des pics, un intervalle minimal, qui remplit cette condition.
  2. Produit plat selon la revendication 1, caractérisé en ce que celui-ci est une tôle ou un ruban d'acier.
  3. Produit plat selon la revendication 2, caractérisé en ce que la tôle ou le ruban d'acier est pourvu/e d'un revêtement de protection contre la corrosion.
  4. Produit plat selon la revendication 3, caractérisé en ce que le revêtement de protection contre la corrosion est un revêtement à base de zinc.
  5. Utilisation d'un produit plat, constitué selon l'une des revendications 1 à 4, pour la fabrication de pièces, destinées à être revêtues d'une couche de laque.
  6. Cylindre pour las fabrication de produits plats, constitués selon l'une des revendications 1 à 4, avec une structure de surface stochastique qui a été produite par Electro Discharge Texturing ("EDT") suivi d'un processus de ponçage fin, pour la surface duquel cylindre, sur une surface de base d'une grandeur d'au moins 0,8 x 0,8 mm2, après une élimination d'une inclinaison possible dans sa topographie, une filtration de fractions à hautes fréquences au moyen d'un filtre passe-bas de Gauss (λs = 10 µm) et une détermination de la distribution de fréquence des valeurs de niveaux avec une largeur de classe de 0,1 µm, s'applique ce qui suit:
    a) la distribution de fréquence des valeurs supérieures présente deux maxima prononcés, qui représentent les niveaux de pics / de creux de la surface.
    b) en considérant seulement les régions topographiques, qui présentent une inclinaison maximale de 5 ° par rapport à l'horizontale, la distribution de fréquence des valeurs supérieures se décompose en au moins deux maxima principaux, locaux. Les maxima locaux sont valables pour les creux d'une divergence standard (largeur) de 2 σ ≤ 10 µm et pour les pics d'une divergence standard (largeur) de 2 σ ≤ 1 µm approximativement distribués normalement.
    c) la fréquence des creux, sur la surface du cylindre, est plus grande que la fréquence des pics.
    d) l'intervalle entre le niveau de pic prononcé et le niveau de creux sur la surface du cylindre est plus grand que l'intervalle entre le niveau de pic et le niveau de creux sur la surface du produit plat réalisée.
    e) sur un plan, qui est situé exactement centralement entre un niveau de pic et un niveau de creux, la demi-largeur des creux, respectivement des pics est de 100 µm au maximum, au moins 99,99 % des points de mesure topographiques présentant, par rapport au bord des creux, respectivement des pics, un intervalle minimal, qui remplit cette condition.
  7. Procédé de fabrication d'un produit plat, constitué selon l'une des revendications 1 à 4, dans lequel
    - on dispose d'un produit plat, qui consiste en matériau métallique, dont au moins la surface, destinée à être pourvue de la topographie superficielle, structurée selon la revendication 1, présente une rugosité moyenne arithmétique maximale de 1,5 µm, et
    - le produit plat disponible est soumis à un laminage de dressage, au cours duquel un cylindre selon la revendication 5, agit sur la surface, destinée à être pourvue de la topographie superficielle, structurée selon la revendication 1, de sorte que l'on obtienne un produit plat avec une surface structurée selon la revendication 1.
EP07110866.6A 2007-06-22 2007-06-22 Produit plat en métal, en particulier en acier, utilisation d'un tel produit plat tout comme presse et procédé de fabrication de tels produits plats Active EP2006037B2 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP07110866.6A EP2006037B2 (fr) 2007-06-22 2007-06-22 Produit plat en métal, en particulier en acier, utilisation d'un tel produit plat tout comme presse et procédé de fabrication de tels produits plats
AT07110866T ATE477065T1 (de) 2007-06-22 2007-06-22 Flachprodukt aus einem metallwerkstoff, insbesondere einem stahlwerkstoff, verwendung eines solchen flachprodukts sowie walze und verfahren zur herstellung solcher flachprodukte
SI200730398T SI2006037T1 (sl) 2007-06-22 2007-06-22 Ploĺ äśat izdelek iz kovinskega materiala, zlasti jeklenega materiala, uporaba takega ploĺ äśatega izdelka ter valj in postopek za izdelavo takih ploĺ äśatih izdelkov
DE502007004723T DE502007004723D1 (de) 2007-06-22 2007-06-22 Flachprodukt aus einem Metallwerkstoff, insbesondere einem Stahlwerkstoff, Verwendung eines solchen Flachprodukts sowie Walze und Verfahren zur Herstellung solcher Flachprodukte
ES07110866T ES2348815T3 (es) 2007-06-22 2007-06-22 Producto plano de un material metalico, en particular de un material de acero, uso de un producto plano semejante asi como cilindro y procedimiento para la fabricacion de tales productos planos.
KR1020097025989A KR101223214B1 (ko) 2007-06-22 2008-06-20 금속 재료, 특히 강 재료로 이루어진 평판형 제품과, 그러한 평판형 제품의 용도와, 그러한 평판형 제품을 제조하기 위한 롤과 방법
PCT/EP2008/057873 WO2009000771A1 (fr) 2007-06-22 2008-06-20 Produit plat en matériau métallique, en particulier en matériau d'acier, utilisation de ce produit plat ainsi que cylindre et procédé de fabrication de ces produits plats
US12/663,809 US8920938B2 (en) 2007-06-22 2008-06-20 Flat product composed of a metal material, in particular a steel material, use of such flat product and roller and process for producing such flat products
CA2687869A CA2687869C (fr) 2007-06-22 2008-06-20 Produit plat en materiau metallique, en particulier en materiau d'acier, utilisation de ce produit plat ainsi que cylindre et procede de fabrication de ces produits plats
CN2008800213797A CN101707928B (zh) 2007-06-22 2008-06-20 由金属材料尤其是钢材制成的扁平轧材、该扁平轧材的用途以及用于制造该扁平轧材的轧辊和方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07110866.6A EP2006037B2 (fr) 2007-06-22 2007-06-22 Produit plat en métal, en particulier en acier, utilisation d'un tel produit plat tout comme presse et procédé de fabrication de tels produits plats

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EP2006037A1 EP2006037A1 (fr) 2008-12-24
EP2006037B1 EP2006037B1 (fr) 2010-08-11
EP2006037B2 true EP2006037B2 (fr) 2023-06-14

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US (1) US8920938B2 (fr)
EP (1) EP2006037B2 (fr)
KR (1) KR101223214B1 (fr)
CN (1) CN101707928B (fr)
AT (1) ATE477065T1 (fr)
CA (1) CA2687869C (fr)
DE (1) DE502007004723D1 (fr)
ES (1) ES2348815T3 (fr)
SI (1) SI2006037T1 (fr)
WO (1) WO2009000771A1 (fr)

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KR20100020474A (ko) 2010-02-22
ES2348815T3 (es) 2010-12-15
WO2009000771A1 (fr) 2008-12-31
CA2687869A1 (fr) 2008-12-31
DE502007004723D1 (de) 2010-09-23
SI2006037T1 (sl) 2010-12-31
ATE477065T1 (de) 2010-08-15
EP2006037A1 (fr) 2008-12-24
KR101223214B1 (ko) 2013-01-17
US8920938B2 (en) 2014-12-30
US20110165430A1 (en) 2011-07-07
CN101707928B (zh) 2012-05-30
CA2687869C (fr) 2012-07-17
EP2006037B1 (fr) 2010-08-11
CN101707928A (zh) 2010-05-12

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