Component having torque-increasing surface and method for manufacturing component

Abstract

The invention relates to a component comprising a fastening region having a fastening surface, the fastening surface having a coating, the coating being produced by a thermal spraying process and the coating having corrugations in a first direction.

Description

Technical Field

[0001] The invention relates to a component and a method for producing a component. Background Art

[0002] The components of the type described have a fixing surface, such as a threaded connection surface, in order to be fixed to other components or parts. For example, it should be ensured that a certain friction torque can be transmitted. DE102008017029A1 proposes a friction enhancement layer on the component in this context, which can be obtained by centrifugally coating hard material particles on the surface used as the component connection surface, so that the hard material particles are introduced into the connection surface of the component, but protrude from the connection surface, wherein the entire surface or only part of the surface of the hard material particles is in material contact with the material of the component and the connection surface of the component is not completely covered by the hard material particles, especially the coverage is ≤30%. The centrifugal coating of the hard material particles is achieved in particular by a thermal spraying process. It has been shown that there is still great potential for improvement, especially when using a thermal spraying process to produce such a layer or coating. Summary of the invention

[0003] It is therefore an object of the present invention to provide a component and a method for producing a component, wherein in particular layers produced by thermal spraying processes, such as in particular friction-enhancing adhesion layers, are to be further optimized.

[0004] This object is achieved by a component according to claim 1 and by a method according to claim 10. Further advantages and features are apparent from the dependent claims as well as from the description and the drawings.

[0005] According to the invention, the component comprises a fixing area with a fixing surface, the fixing surface having a coating, the coating being produced or formed by a thermal spraying process, and the coating having corrugations along a first direction. It has been surprisingly shown that a coating with a corrugated (i.e. non-smooth) surface is very suitable for transmitting, for example, a greater torque compared to a flat or smooth surface (with the same roughness). According to a preferred embodiment, the fixing surface is, for example, a threaded connection surface, preferably a flat surface. However, it is suitable that the coating or coating surface produced thereon is not configured to be flat, but has corrugations.

[0006] Such components are, for example, components made of metal materials, such as light metal materials such as aluminum or steel. According to one embodiment, the components are, for example, components used in the automotive field, such as chassis parts or body parts, structural components, components of the drive train such as transmission bearings, etc. Preferred motor vehicles are especially cars, commercial vehicles or motorcycles, that is, especially land vehicles.

[0007] According to one embodiment, the corrugations are formed by a series of, in particular, recurring, troughs and crests. The term "corrugations" does not necessarily mean a profile that forms an arc in the first direction. The corrugations can also be designed "step-like", for example. However, it is important that a series of depressions and elevations is formed. In particular, this can ensure, for example, a local increase in surface pressure, which can produce a coating, in particular an adhesion layer, that is suitable for transmitting high and highest torques.

[0008] According to one embodiment, the geometric structures produced during painting are mechanically reworked. This allows, for example, wave crests to be configured as "plateaus". This can be advantageous if the dimensional tolerances (especially with regard to the thickness of the coating) are very narrow and / or if the actual contact or fastening surface is to have precisely defined dimensions.

[0009] According to one embodiment, the distance between two adjacent wave peaks is about 2 mm to 8 mm. According to a preferred embodiment, the distance is about 4 mm to 6 mm. The center point of two adjacent "waves" is used as a reference point.

[0010] According to one embodiment, the coating has a plurality of tracks oriented parallel to one another, which tracks are oriented in a second direction which is perpendicular or substantially perpendicular to the first direction.

[0011] According to a preferred embodiment, the thermal spraying process is in particular a cold gas spraying process. Usually, the tracks produced during thermal spraying generally have, for example, an approximately circular arc shape in cross section. The tip of the circular arc forms, for example, a wave crest. If a plurality of tracks are now produced side by side at a certain distance, a series of wave crests and wave troughs are formed accordingly.

[0012] According to a preferred embodiment, the thickness of the coating is about 0.1 mm to 0.3 mm. In particular, it can be said that according to a preferred embodiment, the height of the wave peaks is in particular 1 mm to 3 mm. Correspondingly, according to a preferred embodiment, the "height" or thickness of the wave valleys is about 0.15 mm to 0.25 mm.

[0013] It is entirely conceivable that, depending on the nozzle selected, tracks with different geometries can be produced during thermal spraying. However, it is also important here that the surface produced in the first direction is not smooth or at least not completely smooth, but has corrugations.

[0014] According to a preferred embodiment, the average roughness depth Rz of the coating surface along the second direction is about 50 μm to 350 μm. According to a preferred embodiment, the roughness is 75 μm to 200 μm, particularly preferably 90 μm to 130 μm.

[0015] In this case, the particle size of the powder used in thermal spraying, in particular in cold gas spraying, is also important and is currently preferably between 10 μm and 60 μm.

[0016] According to a preferred embodiment, the turning point of the rails is not located on the fixing surface. Accordingly, the fixing surface preferably has only rails oriented parallel to each other, which extend in the second direction.

[0017] According to a preferred embodiment, the coating material comprises steel, in particular stainless steel, particularly preferably austenitic stainless steel, such as 316L. 316L (also known as alloy 1.4404) is an austenitic stainless steel that has very good corrosion resistance due to its high chromium and molybdenum content and low carbon content.

[0018] According to one embodiment, the coating material comprises a material with a higher electrical conductivity than steel. According to a preferred embodiment, the coating material comprises copper, for example. Accordingly, an adhesion layer can advantageously be produced which additionally has a good to very good electrical conductivity. Thus, components such as cell connectors, cable guides, etc., which are used as current connectors or the like, can also be coated accordingly.

[0019] The invention also relates to a method for producing a component having a coating, the method comprising the following steps:

[0020] Provide components;

[0021] The component is coated in places by a thermal spraying process in such a way that a coating having corrugations in a first direction is produced.

[0022] Such corrugations are produced, for example, by spraying a plurality of tracks oriented parallel to one another. As already mentioned, the thermal spraying process is preferably a cold gas spraying process. The advantages and features mentioned in connection with the component also apply analogously and accordingly to the method, and vice versa.

[0023] According to a preferred embodiment, during cold gas spraying, a gas pressure of between 40 and 60 bar and a gas temperature of between 900° C. and 1200° C. is used. Optimum results are achieved in particular at a pressure of between 45 and 50 bar, in particular 47 bar, and a gas temperature of between 1000° C. and 1100° C., in particular 1050° C.

[0024] According to a preferred embodiment, the method comprises the following steps:

[0025] Powders with a particle size between 10 μm and 60 μm, particularly preferably between 20 μm and 53 μm, are used.

[0026] As already mentioned, steel, in particular the above-mentioned stainless steel material, is preferably used as the material. In order to influence, in particular to increase the electrical conductivity of the coating, a material such as copper can also be added to this base material, for example. By using conductive powders such as copper, an electrically conductive threaded connection including an increased friction coefficient can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other advantages and features are derived from the following description of the component embodiments with reference to the accompanying drawings. The accompanying drawings are as follows:

[0028] Figure 1 A schematic partial view showing a fixing surface of a component;

[0029] Figure 2 Shown as Figure 1 A cross-sectional view schematically shown. DETAILED DESCRIPTION

[0030] Figure 1 A partial view of a component is schematically shown, which comprises a plurality of fixing surfaces 10, on which a coating 11 is formed. The fixing surfaces 10 are configured in the present case as surfaces each having an elongated hole, which is provided for screwing the component. The fixing surfaces 10 may also be referred to as screwed connection surfaces accordingly. The base component is, for example, a casting, for example made of aluminum. Reference numeral 20 denotes a plurality of tracks along which the coating is applied, for example by means of a hot coating method such as cold gas spraying. According to a preferred embodiment, a robot is used for this purpose, for example. It can be seen that the turning points of the tracks 20 are respectively located outside the fixing surfaces 10. As a result, tracks 20 oriented parallel to each other are formed on the fixing surfaces 10, which extend in a second direction. This coating produces a corrugated profile in a first direction 1, such as Figure 1 See also Figure 1 The cross section shown in .

[0031] Figure 2 Show Figure 1 , in which the corrugated profile of the coating 11 can be seen in particular. A series of wave crests 12 and wave troughs 14 are produced along the first direction 1. The height of the coating 11, i.e., in particular the height of the wave crests 12, is, for example, approximately 0.1 mm to 0.3 mm. The preferred spacing a between two mutually adjacent wave crests 12 is, for example, 2 to 8 mm. Reference numeral 40 denotes a coating tool, such as a nozzle, by means of which the coating 11 is applied. Reference numerals list

[0032] 1First Direction

[0033] 2 Second direction

[0034] 10Fixed surface

[0035] 11 Coating

[0036] 12 crest

[0037] 14Trough

[0038] 20 tracks

[0039] 40Painting tools, nozzles

[0040] a Spacing

[0041] dThickness, height

Claims

1. A component comprising a fixing region having a fixing surface (10), the fixing surface having a coating (11), the coating (11) being produced by a thermal spraying process and having corrugations in a first direction (1).

2. The component according to claim 1, wherein The corrugations are formed by a series of troughs (14) and crests (12), and the distance (a) between two adjacent crests (12) is about 2 mm to 8 mm.

3. A component according to claim 1 or 2, wherein: The coating (11) has a plurality of tracks (20) oriented parallel to one another and oriented in a second direction (2) which is perpendicular to the first direction (1).

4. A component according to any one of the preceding claims, wherein The thickness (d) of the coating (11) is about 0.1 mm to 0.3 mm.

5. A component according to any one of the preceding claims, wherein The average roughness depth Rz of the surface of the coating (11) along the second direction (2) is about 50 μm to 350 μm.

6. A component according to any one of claims 3 to 5, wherein: The turning point of the track (20) is not located on the fixed surface (10).

7. A component according to any one of the preceding claims, wherein The coating material comprises steel.

8. A component according to any one of the preceding claims, wherein The coating material includes copper.

9. A component according to any one of the preceding claims, wherein: The fixing surface (10) is a threaded connection surface.

10. A method for producing a component having a coating, the method comprising the following steps: Provide components; A component is locally coated by a thermal spraying process, so that a coating (11) having corrugations in a first direction (1) is produced.

11. The method according to claim 10, wherein: The coating process is cold gas spraying and the spraying is carried out at a gas pressure of between 40 bar and 60 bar and a gas temperature of between 900° C. and 1200° C.

12. The method according to claim 10 or 11, comprising the following steps: Use powders with a particle size between 12 μm and 60 μm for coating.

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