BRUSH GRINDING HEAD FOR A GRINDING MACHINE

Abstract

The invention relates to a brush grinding head (1) for a grinding machine (2), comprising an essentially roller-shaped carrier (3) and grinding lamellae (4), wherein the grinding lamellae (4) are arranged peripherally on the carrier (3) and are composed at least of, in particular bundled brushes (5) and an essentially strip-shaped grinding element (6) which is arranged adjacent thereto. The grinding element (6) comprises at least one abrasive layer (7) and an abrasive-free layer (8) which can be compressed while retaining its shape and is designed in such a way that a grinding fluid (27), in particular water, can be stored in it.

Claims

1-13. (canceled)

14. Brush grinding head (1) for a grinding machine (2), comprising a, particularly drum-formed, carrier (3) and grinding lamellae (4), wherein the grinding lamellae (4) are arranged on the circumference of the carrier (3) and are composed of at least, particularly bundled, brushes (5) and an adjacently arranged, particularly lamellar, grinding element (6), characterized in that the grinding element (6) comprises at least a layer (7) of grinding means and a layer (8) which is free of grinding means, wherein the layer (8) is compressible while maintaining its form and is constructed in such a way, that a grinding fluid (27), particularly water, is storable in it.

15. Brush grinding head (1) according to claim 14, wherein the grinding element (6) and the brushes (5) of the grinding lamellae (4) are each arranged in a common groove (32).

16. Brush grinding head (1) according to claim 14, wherein the layer (7) of grinding means comprises a flexible, in particular textile, carrier layer (9) for the grinding means (10), which is permeable for the grinding fluid (27), particularly water.

17. Brush grinding head (1) according to claim 14, wherein the layer (7) of grinding means comprises grinding means (10) which are chosen from a group consisting of diamond and cubic boron nitride, preferably with a grain size (11) of 1 to 270 m.

18. Brush grinding head (1) according to claim 14, wherein the layer (7) of grinding means comprises a binding agent (12), preferably a resin-based binding agent.

19. Brush grinding head (1) according to claim 14, wherein the layer (7) of grinding means contacts the layer (8) which is free of grinding means via the carrier layer (9) and the grinding means (10) with the binding agent (12) is arranged at the opposite side of the carrier layer (9), such that when wet-grinding the grinding fluid (27) stored in the layer (8) which is free of grinding means can be supplied to an active side of the layer (7) of grinding means via the carrier layer (9) and can there remove abrasive dust.

20. Brush grinding head (1) according to claim 14, wherein the brushes (5) are made of natural hair, preferably of cactus hair.

21. Brush grinding head (1) according to claim 14, wherein the grinding lamellae (4) are each connected to the carrier (3) by an attachment element (13), wherein the brushes (5) and the grinding element (6) are mounted to the attachment element (13).

22. Brush grinding head (1) according to claim 14, wherein the brush grinding head (1) comprises a rotational axis (14) and the grinding lamellae (4) are arranged parallel or angular to the rotational axis (14) at the carrier (3).

23. Brush grinding head (1) according to claim 14, wherein the grinding lamellae (4) are inclined relatively to the surface (15) of the carrier (3).

24. Brush grinding head (1) according to claim 14, wherein the grinding element (6) is divided into sections (16).

25. Grinding machine (2) with a brush grind head (1) according to claim 14.

26. Grinding machine (2) according to claim 25, wherein the grinding machine (2) comprises a hand guide (17), preferably with a supply (18) for the grinding fluid, and/or a protection shield (19).

27. Use of a brush grinding head (1) according to claim 14 for machining a surface (21), preferably coated with a clear coat (20) for protection of environmental influences, of a work piece (22), wherein at least a region (23) of the work piece (22) adjacent to the surface (21) for machining consists of a carbon fibre composite material or a glass fibre composite material.

28. Use of a brush grinding head (1) according to claim 14 for machining a surface (25), preferably coated with wax (24), of a cast (26) for the production of a work piece (22), which at least region-wise consists of a carbon fibre composite material or a glass fibre composite material.

29. Use according to claim 27, wherein the use is effected while supplying a grinding fluid (27), preferably water, particularly preferred water charged with soap.

30. Use according to claim 27, wherein the work piece (22) is a part, preferably a rotor, of a wind energy plant.

31. Brush grinding head (1) according to claim 15, wherein the layer (7) of grinding means comprises a flexible, in particular textile, carrier layer (9) for the grinding means (10), which is permeable for the grinding fluid (27), particularly water.

32. Brush grinding head (1) according to claim 15, wherein the layer (7) of grinding means comprises grinding means (10) which are chosen from a group consisting of diamond and cubic boron nitride, preferably with a grain size (11) of 1 to 270 m.

33. Brush grinding head (1) according to claim 16, wherein the layer (7) of grinding means comprises grinding means (10) which are chosen from a group consisting of diamond and cubic boron nitride, preferably with a grain size (11) of 1 to 270 m.

Description

[0023] Further details and advantages of the present invention will be described more fully hereinafter by means of the specific description with reference to the embodiments by way of example illustrated in the drawings, in which:

[0024] FIG. 1 shows a brush grinding head in a perspective view,

[0025] FIG. 2 shows a cross-section of a brush grinding head with an enlarged detail of a grinding element,

[0026] FIG. 3 shows a cross-section of a grinding machine,

[0027] FIGS. 4a-4c show advantageous embodiments of a grinding lamella in a side view,

[0028] FIG. 5a shows the use of a brush grinding head for machining a surface coated with clear coat of a work piece made of a carbon fibre composite material or a glass fibre composite material and

[0029] FIG. 5b shows the use of a brush grinding heat for machining a surface (25) coated with wax of a cast for the production of a work piece made of a carbon fibre composite material or a glass fibre composite material.

[0030] FIG. 1 shows a brush grinding head 1 for a grinding machine 2 comprising a drum-formed carrier 3, wherein this carrier 3 is constructed rotationally symmetric in this case.

[0031] The brush grinding head 1 further comprises grinding lamellae 4, which are arranged on the circumference of the carrier 3. The brush grinding head 1 comprises a rotational axis 14. The grinding lamellae 4 are arranged parallel to this rotational axis 14 at the carrier 3. Alternatively, an arrangement is possible where the grinding lamellae 14 are aligned angular to the rotational axis 14. In this case, the grinding lamellae 14 would be bent about the radius of the carrier 3 and would be arranged helically at the carrier 3.

[0032] The carrier 3 comprises extensions 29 which are arranged at both front faces of the carrier 3 and with which the brush grinding head 1 can be mounted in a grinding machine 2.

[0033] Also the drive of the brush grinding head 1 can be effected via the extensions 29. Hereto, it is advantageous to adapt the geometry of the extensions 29 in such a way that in a simple manner a torsional moment can be transferred, for example by arranging at least one groove in which a part of a drive means is engaging form-fittingly.

[0034] Finally, the extensions 29 can serve as a further technical function in order to fix the grinding lamellae 4, for example against a shift parallel to the rotational axis 14.

[0035] A centering device for centering the brush grinding head 1 in a grinding machine 2 can be arranged in the extensions 29, for example in the form of a central bore.

[0036] The extensions 29 can be built in one piece with the carrier 3 or in form of one or several separate structural elements which are connected to the carrier 3, for example via screws.

[0037] In FIG. 1 the grinding lamellae 4 are only indicated schematically in their entirety. A more detailed structure originates from FIG. 2, wherein FIG. 2 shows a cross-section view for example along the dotdashed cross-section plane 28 drawn in FIG. 1. In this context it should be indicated that in the cross-section view for reasons of clarity only eight grinding lamellae 4 are considered. The grinding lamellae 4 according to the embodiment of FIG. 2 consist of brushes 5 and an adjacently arranged lamellar grinding element 6, wherein both component, so the brushes 5 and the grinding element 6, are arranged at an attachment element 13 by an adhesive connection. The entirety of brushes 5, the grinding element 6 and the attachment element 13 in form of a slat is then in the area of the attachment element 13 axially inserted in corresponding grooves 32 provided on the circumference of the carrier 3 and are secured against turning by the geometry of the attachment element 13 and the grooves 32 respectively. The grinding lamellae 4 are arranged spaced from one another at the carrier 3. In FIG. 2 the distance of two neighboured grinding lamellae 4 is provided with reference sign 30.

[0038] From FIG. 2 it further derives that the grinding lamellae 4 are inclined slightly in comparison to the surface 15 of the carrier 3, this means they are not aligned normal to the surface 15 of the carrier 3 but are slightly tilted compared to this normal. Assuming a grinding direction 31, for example as shown in FIG. 5a, then the shown grinding lamellae 4 are slightly tilted from the normal against the grinding direction 31. Alternatively thereto however a tilting into the grinding direction 31 can be provided if this attains an advantageous grinding result in a specific case of application.

[0039] FIG. 2 also comprises an enlarged detail of a grinding element 6. It derives from this view that the grinding element 6 in the shown case consists of a layer 7 of grinding means and a layer 8 which is free of grinding means, wherein this layer 8 which is free of grinding means is compressible while maintaining its form and is constructed in such a way, that a grinding fluid 27, particularly water, is storable in it. Thereby the layer 7 of grinding means comprises a flexible textile carrier layer 9 for the grinding means 10, which is permeable for the grinding fluid 27. So the layer 7 of grinding means contacts the layer 8 which is free of grinding means via the flexible textile carrier layer 9 which is permeable for the grinding fluid 27. The grinding means 10 with a binding agent 12 is arranged at the opposite side of this carrier layer 9. The grinding means 10 is preferably concerning a diamond or cubic boron nitride, preferably with a grain size 11 of 1 to 270 m. By reference to an arrow it is indicated how the grinding fluid 27 stored in the layer 8 which is free of grinding means can support the grinding process when wet-grinding in such a way that the grinding fluid 27 is supplied to the active side of the layer 7 of grinding means via the carrier layer 9 and there removes abrasive dust.

[0040] FIG. 3 shows a cross-section view of an advantageous embodiment of a grinding machine 2 according to the invention, comprising a brush grinding head 1 as shown in FIG. 2, wherein the grinding machine 2 further comprises a hand guide 17 with which die grinding machine 2 can be moved by an operator on the surface to be machined. Yet a supply 18 for the grinding fluid 27 is integrated in the hand guide 17. Further, a part of the brush grinding head 1 is covered by a protection shield 19.

[0041] The FIGS. 4a to 4c show three advantageous embodiments of a grind lamella, wherein it concerns in this cases a side view in comparison with the cross-section views of FIGS. 2 and 3. Brushes 5 and lamellar grinding elements 6 are arranged in all three cases at each attachment element 13 in form of a slat, wherein in the case of FIG. 4a the grinding element 6 is formed in one piece and the brushes are not having a special organisation.

[0042] In contrast in the case of FIG. 4b the grinding element 6 is separated in several sections 16 which are movable relatively to each other.

[0043] In FIG. 4c the brushes 5 are bundled.

[0044] Also an alternative combination of the described features of the grinding lamellae 4 is possible, thus for example a bundling of the brushes 5 and a segmentation of the grinding elements 6.

[0045] In all three embodiments according to FIGS. 4a to 4c the brushes 5 are formed slightly shorter than the grinding element 6. However, this is not mandatory. Just as well the hairs of the brushes 5 can have the same length as the grinding elements 6 or can even have a greater length.

[0046] FIG. 5a shows the use of a brush grinding head 1 for machining a surface 21 of a work piece 22 coated with a clear coat 20 for protection of environmental influences, wherein at least a region 23 of the work piece 22 adjacent to the surface 21 for machining consists of a carbon fibre composite material or a glass fibre composite material. In the shown use the brush grinding head 1 is rotated in such a way that the grinding lamellae 4 are first contacting the surface 21 to be machined with the grinding element 6 and afterwards with the brushes 5.

[0047] FIG. 5b shows the use of a brush grinding head 1 for machining a surface 25 coated with wax 24 of a cast 26 for the production of a work piece 22, which at least region-wise consists of a carbon fibre composite material or a glass fibre composite material.

[0048] Said work piece 22which is directly machined in the case of FIG. 5a or which is produced by a cast 26 in the case of FIG. 5bconcerns for example a part, preferably a rotor, of a wind energy plant.