METAL SHEET HAVING A DETERMINISTIC SURFACE STRUCTURE AND METHOD FOR PRODUCING A FORMED AND COATED SHEET-METAL COMPONENT

Abstract

The invention relates to a sheet metal having a deterministic surface structure, the surface structure being impressed into the sheet metal, the surface structure having at least one peak region and at least one valley region, the peak region and the valley region being joined by a flank region. The invention further relates to a method for producing a formed and coated sheet-metal component.

Claims

1. A sheet metal having a deterministic surface structure, the surface structure being impressed into the sheet metal, the surface structure having at least one peak region and at least one valley region, the peak region and the valley region being joined by a flank region wherein at least one of the peak region and the valley region have a substructure configured such that the substructure has a surface area greater by at least 3% in comparison to a flat projection face (P) of at least one of the peak region and of the valley region or has an Sdr of at least 3%.

2. The sheet metal as claimed in claim 1, wherein the substructure has a surface area greater by at least 7% in comparison to the flat projection face (P) of at least one of the peak region and of the valley region or has an Sdr of at least 7%.

3. The sheet metal as claimed in claim 2 wherein the substructure being configured in a crystal-like manner in at least one of the peak region and in the valley region.

4. The sheet metal as claimed in claim 3 wherein, the sheet metal is coated with a metallic coating.

5. The sheet metal as claimed in claim 4 wherein, the sheet metal is coated with one of a phosphate coating or silane-based coating, and wherein the thickness of the coating is less than 500 nm.

6. A method for producing a formed and coated sheet-metal component, the method comprising the following steps: providing a sheet metal having a deterministic surface structure, the surface structure having been impressed into the sheet metal by means of a skin-pass roll, the surface structure having at least one peak region and at least one valley region, the peak region and the valley region being joined by a flank region, forming the sheet metal into a sheet-metal component, coating the formed sheet-metal component, wherein the skin-pass roll with which the surface structure has been impressed into the sheet metal, during the impressing in at least one of the peak region and in the valley region, has generated a substructure such that a substructure has been generated that has a surface area greater by at least 3% in comparison to at least one of a flat projection face (P) of the peak region and of the valley region or that has an Sdr of at least 3%.

7. The method as claimed in claim 6, wherein no zinc phosphating having been carried out before the forming of the sheet metal.

8. The method as claimed in claim 7, wherein the sheet metal, before the providing of the sheet metal, has been coated with one of a phosphate coating or silane-based coating, wherein the thickness of the coating is less than 500 nm.

9. The method as claimed in claim 8, wherein the sheet metal has been treated with an acidic solution before or after the introduction of the surface structure.

10. The method as claimed in claim 9, wherein the sheet-metal component is an outer skin part of a vehicle.

11. The method as claimed in claim 9, wherein the sheet metal component is a structural part of a vehicle.

Description

[0038] In the drawing

[0039] FIG. 1) shows a schematic view in partial section of one embodiment from the prior art,

[0040] FIG. 2) shows a schematic view in partial section of one embodiment according to the invention,

[0041] FIG. 3) shows a schematic view in partial section of another embodiment according to the invention, and

[0042] FIG. 4) shows a schematic sequence of one embodiment according to a method of the invention.

[0043] FIG. 1 shows a schematic view in partial section of one embodiment from the prior art. The embodiment may correspond, for example, to the embodiment according to EP 2 892 663 B1. A sheet metal (1) is represented which has a deterministic surface structure (2), the surface structure (2) being impressed into the sheet metal (1), with the surface structure (2) having at least one peak region (1.1) and at least one valley region (1.2), the peak region (1.1) and the valley region (1.2) being joined by a flank region (1.3). The sheet metal (1) is preferably a sheet steel.

[0044] FIG. 2 shows a schematic view in partial section of one embodiment according to the invention. In contrast to FIG. 1, the peak region (1.1) and/or the valley region (1.2) has a substructure (1.11, 1.21) which is configured such that the substructure (1.11, 1.21) has a surface area greater by at least 3% in comparison to a flat projection face (P) of the peak region (1.1) and/or of the valley region (1.2), or has an Sdr of at least 3%. The substructure (1.11, 1.21) may be configured in a crystal-like manner in the peak region (1.1) and/or in the valley region (1.2), with the crystal-like configuration being implemented lengthwise and/or spherically as an elevation and/or indentation, shown as an indentation in this embodiment, in the peak region (1.1) and/or valley region (1.2); it is possible in particular to set a length, width or diameter of the crystal-like configuration of between 0.5 and 20 μm.

[0045] FIG. 3 shows a schematic view in partial section of another embodiment according to the invention. In comparison to FIG. 2, the sheet metal (1) is coated with a metallic coating (3), preferably with a zinc-based coating. Alternatively or, preferably, additionally the sheet metal (1) is coated with a phosphate coating (4), in which case the thickness of the phosphate coating (4) may be less than 500 nm.

[0046] A sheet metal (1) of the invention, more particularly in accordance with the embodiment in FIG. 3, is provided for the purpose of producing a formed and coated sheet-metal component not shown, (A). In a subsequent step, the sheet metal (1) provided is formed into a formed sheet-metal component, (B). After forming has taken place, the formed sheet-metal component is coated, (C). FIG. 4 shows schematically a corresponding sequence of the method of the invention. The formed and coated sheet-metal component not shown may be used as an outer skin part or structural part in the vehicle.

[0047] The individual features can all be combined with one another in so far as is technically possible.