Method and apparatus for generating a surface structure

Abstract

The invention relates to a method and a device for generating a surface structure (1) on a surface (3) by means of a laser (2), wherein the laser (2) performs a combination movement (5) of a spiral movement (7) and a wobble movement (9) at least partially over the surface (3) and wherein the laser (2) is guided by means of the combination movement (5) on a track (11) in the direction of a center point (13) of the surface (3) and generates a diffuse surface structure (1) along the track (11) by lasering the surface (3).

Description

[0001] The invention relates to a method and a device for creating a surface structure on a surface using a laser.

[0002] JPH05-277764 is a known method for structuring the surface of a workpiece using a laser.

[0003] From DE20321769 a device for introducing depressions into contact surfaces of two force-fit connected bodies by means of radiation treatment is known.

[0004] CN1014091 discloses a method for measuring roughness values ​​using laser scanning. CN101441068 discloses a method and a device for non-contact determination of roughness values ​​using a laser beam. CN1042777 discloses a method for determining surface quality. CN109884061, CN119756245, FR2601128, JP5694626, JP6301477, JPH01-53401, US4146330, and US10942025 disclose further methods for determining roughness values.

[0005] CN210198331 discloses a measuring device for surface roughness based on a laser scattering method. JP6382303 and JPH01-282411 disclose further measuring devices for surface roughness. EP2954284 discloses a device for measuring the surface roughness of the inner surface of a hollow element with a substantially constant internal cross-section.

[0006] The invention is based on the objective of providing a method and a device that produce an improved surface structure.

[0007] The first problem is solved according to the invention by a method having the features of claim 1. The second problem is solved according to the invention by a device having the features of claim 5.

[0008] Advantageous embodiments of the invention are the subject of the dependent claims.

[0009] The inventive method for generating a surface structure on a surface using a laser provides that the laser performs a combined movement of a spiral movement and a wobble movement at least partially over the surface, wherein the laser is guided along a track towards a center point of the surface by means of the combined movement and generates a diffuse surface structure on the surface along the track by lasering, in particular by impinging a laser beam of the laser on the surface.

[0010] An advantage of the invention lies in the fact that such a diffuse, and in particular homogeneous and reproducible, diffuse surface structure is generated, which exhibits a largely homogeneous surface quality and, in particular, can be produced with variable roughness and / or has the same roughness values ​​in any measurement direction. By varying the parameters of the device, different roughness values ​​can be generated with repeatable accuracy. Consequently, the surface quality is always identical and remains constant even within a specific laser coupling area.

[0011] The method according to the invention can be easily applied to various materials. For example, the method can be used on surfaces made of any aluminum alloy, iron, non-ferrous metals, or the like. Furthermore, it can be implemented with common lasers and standard laser equipment and is easily integrated into existing laser cleaning applications.

[0012] The device according to the invention for generating a surface structure on a surface by means of a laser provides that the laser is configured to perform a combined movement of a spiral movement and a wobble movement at least partially over the surface, wherein the laser can be guided along a track in the direction of a center point of the surface by means of the combined movement and wherein the laser is configured to generate a diffuse surface structure along the track by lasering, in particular by impinging a laser beam of the laser on the surface.

[0013] Exemplary embodiments of the invention are explained in more detail below with reference to drawings.

[0014] This shows: Fig. 1 schematically a combination movement of a laser, Fig. 2. A schematically drawn area in perspective, Fig. 3 schematically a top view of a surface with a surface structure, Fig. 4. Schematically shown in perspective, a surface with a surface structure, Fig. 5 schematically a spiral movement of the laser, Fig. 6 schematically shows an example of a wobble motion of the laser, and Fig. Figure 7 schematically shows another example of a wobble motion of the laser.

[0015] Corresponding parts are marked with the same reference symbols in all figures.

[0016] Fig. Figure 1 schematically shows a combination movement 5 of a laser 2 not shown in detail.

[0017] The combined movement 5 comprises, in particular, a spiral movement 7 and a wobble movement 9 of the laser 2. The laser 2 is movably mounted, in particular movably mounted in the longitudinal and / or transverse and / or vertical direction. The laser 2 is controlled and / or guided in such a way that it executes the combined movement 5. For example, the laser 2 executes the spiral movement 7 and superimposes this spiral movement 7 with a wobble movement 9.

[0018] In Fig. Figure 2 schematically depicts a surface 3 in perspective. Surface 3 is, for example, a surface of workpiece 4. For instance, surface 3 is a surface of workpiece 4. Surface 3 has, in particular, a center point 13. Additionally, surface 3 has an outer point 15. For example, the outer point 15 is a point on surface 3 that is at its maximum distance from the center point 13 on surface 3.

[0019] The workpiece 4 is positioned, aligned and / or fixed, for example, by means of the device according to the invention, in order to enable machining of the surface 3. Fig. Figure 2 shows area 3 before treatment using laser 2 (shown in Fig. 1) and therefore untreated.

[0020] Fig. Figure 3 schematically shows a top view of a surface 3 with a surface structure 1.

[0021] The laser 2 is, for example, positioned above and in the direction of surface 3 and configured to direct a laser beam onto surface 3, whereby the laser beam of laser 2 illuminates surface 3 (= lasering). The laser beam is, in particular, arranged perpendicular to surface 3. In the area of ​​illumination, the surface structure 1 is generated. The surface structure 1 is, in particular, located on surface 3. To generate a uniform, diffuse surface structure 1 across surface 3, the laser 2 performs, in particular, the combined movement 5. The workpiece 4 with surface 3 is, in particular, positioned / aligned such that surface 3 is rigidly fixed during the generation of the surface structure 1.

[0022] To generate the surface structure 1, the laser 2 performs the combined movement 5 across the surface 3, at least in certain areas. For example, the laser 2 performs the spiral movement 7 from the outer point 15 to the center point 13. In this process, the laser 2 is guided around the center point 13. For example, the laser 2 is guided around the center point 13 at a distance 14 from the center point 13. The laser 2 orbits the center point 13 at a distance 14, with the distance 14 being continuously reduced, for example, to execute the spiral movement 7. The laser 2 is guided, for example, along a track 11 from the outer point 15 to the center point 13.

[0023] Alternatively, the laser 2 can also perform the spiral movement 7 from the center point 13 to the outer point 15. In this case, the laser 2 orbits the center point 13, in particular with a continuously increasing distance 14 from the center point 13. The distance 14 to the center point 13 is increased, for example, until the laser 2 reaches the outer point 15.

[0024] The combined movement 5 of the laser 2 further includes the wobble movement 9. This is executed simultaneously with the spiral movement 7. The spiral movement 7 is thus superimposed on the wobble movement 9. The wobble movement 9 is, in particular, an oscillation of the laser 2 with a predetermined, for example, very small, amplitude. The laser 2 oscillates at a predetermined frequency, for example, a high frequency. In addition, the laser 2 can oscillate perpendicular to a feed of the spiral movement 7. This generates a movement pattern according to Fig. 6. The combination movement 5 is performed in particular along track 11 or corresponds to track 11.

[0025] The combined movement 5 of the laser 2 on the surface 3 creates a surface structure 1 along the track 11 on the surface 3. In particular, a uniform, diffuse surface structure 1 is created along the track 11 by lasering. For example, the surface 3 can be lasered multiple times along the track 11. The laser 2 is thus controlled and guided, for example, such that the track 11 is traversed multiple times with the combined movement 5.

[0026] Fig. Figure 4 schematically shows in perspective the surface 3 with a surface structure 1 according to Fig. 3.

[0027] Fig. Figure 5 schematically shows a spiral movement 7 of the laser 2. The spiral movement 7 is carried out in particular from the outer point 15 to the center point 13 and / or from the center point 13 to the outer point 15 over the surface 3.

[0028] Fig. Figure 6 schematically shows an example of a wobble motion 9 of the laser 2. The laser 2 oscillates in particular perpendicular to the track 11 with a predetermined frequency and amplitude.

[0029] Fig. Figure 7 schematically shows another example of a wobble motion 9 of the laser 2. Here, a loop-shaped motion pattern is generated by a circular movement of the laser 2. Reference symbol list 1 Surface structure 2 lasers 3 Area 4 workpieces 5 Combination movement 7 Spiral movement 9 Wobble movement 11 lanes 13 Center 14 distance 15 outer point QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JPH05-277764

[0002] DE 20321769

[0003] CN 1014091

[0004] CN 101441068

[0004] CN 1042777

[0004] CN 109884061

[0004] CN 119756245

[0004] JP 5694626

[0004] JP 6301477

[0004] JPH01-53401

[0004] US 4146330

[0004] US 10942025

[0004] CN 210198331

[0005] JP 6382303

[0005] JPH01-282411

[0005] EP 2954284

[0005]

Claims

[1] Method for generating a surface structure (1) on a surface (3) using a laser (2), characterized by , that the laser (2) performs a combination movement (5) of a spiral movement (7) and a wobble movement (9) at least partially over the surface (3), wherein the laser (2) is guided by means of the combination movement (5) on a track (11) in the direction of a center point (13) of the surface (3) and generates a diffuse surface structure (1) along the track (11) by lasering the surface (3). [2] Method according to claim 1, characterized by , that the laser (2) is guided from an edge or an outer point (15) of the surface (3) to the center point (13) of the surface (3). [3] Method according to claim 1 or 2, characterized by, that the laser (2) is guided around the center point (13) of the surface (3), in particular at a distance (14) from the center point (13) around this center point (13), optionally the distance (14) to the center point (13) is continuously reduced. [4] Method according to any one of the preceding claims, characterized by , that the laser (2) is controlled and guided in such a way that the track (11) is crossed several times. [5] Device for generating a surface structure (1) on a surface (3) using a laser (2), characterized by, that the laser (2) is configured to perform a combination movement (5) of a spiral movement (7) and a wobble movement (9) at least partially over the surface (3), wherein the laser (2) can be guided by means of the combination movement (5) on a track (11) in the direction of a center point (13) of the surface (3) and wherein the laser (2) is configured to generate a diffuse surface structure (1) along the track (11) by lasing on the surface (3).

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