Tool for processing an object

Abstract

The invention relates to a tool for machining an object, which has a plurality of fingers arranged in layers, wherein the fingers are spaced apart from each other within the layers.

Description

[0001] The invention relates to a tool for machining an object, which tool has a plurality of fingers arranged in layers, the fingers being spaced apart from one another within the layers.

[0002] Burrs can occur during workpiece processing. These usually sharp edges can cause injuries during component handling and / or compromise subsequent process steps (e.g., edge misalignment during powder coating, inaccurate fit, etc.).

[0003] During deburring, the burrs on the component are removed. Burr removal often requires a two-step process. In the first step, the primary burr is removed, followed by the secondary burr. The second step is often necessary because the primary burr is not completely removed but reshaped. In addition to deburring, edge rounding is often required to meet additional quality requirements.

[0004] Deburring and rounding machines have become established in the field of deburring and edge rounding of 2D and, in some cases, 3D workpieces. These machines typically employ a grinding belt or disc unit with grinding belts or grinding wheels to remove the primary burr, and then remove or create the secondary burr or edge rounding using deburring and rounding tools. Edge rounding is considered critical as the radius increases. The quadratic relationship between radius and chip volume places considerable demands on the tools used. Doubling the edge radius quadruples the chip volume.

[0005] To achieve greater edge rounding with a given tool and workpiece, the machine must be operated in such a way that the rounding tools have the longest possible contact time (low feed rate) and are infeeded correspondingly deep to the workpiece edges. The long contact time and deep infeed lead to extended process times, increased tool wear, and undesirable heat input into the workpiece.

[0006] Furthermore, the low feed rate for edge rounding is disproportionate to the primary burr removal. While primary burr removal can be performed at feed rates between 1 and 10 m / min, feed rates between 0.2 and 0.5 m / min are used for intensive edge rounding.

[0007] For deburring and edge rounding of 2D and sometimes 3D workpieces made of metallic materials with varying workpiece contours, state-of-the-art tools primarily use abrasive materials consisting of a combination of abrasive cloth and abrasive fleece. In most applications, the abrasive material is the main element in coated abrasives. To achieve adaptability of the abrasive materials to the workpiece contours, these are sometimes used in a slotted design and provided with soft intermediate or support layers (e.g., abrasive fleece, Tampico fiber). Depending on the respective processing principle or processing unit, the tools can be designed as rollers, discs, or blocks.

[0008] Despite the various tool configuration options (e.g., abrasive cloth grit, abrasive fleece density, etc.), the stock removal rates have so far been unsatisfactory, necessitating low feed rates and deep infeeds. These process parameters compromise the cost-effectiveness of deburring and rounding processes.

[0009] The object of the present invention is to provide a tool for machining, preferably for deburring and / or edge rounding, an object that enables higher feed rates with the same edge rounding or greater edge rounding with the same feed rate. It is also an object to provide a method for deburring and rounding edges of a workpiece within a single process step.

[0010] The object is achieved by the tool for machining an object according to claim 1, the method for removing secondary burrs according to claim 13 and the method for deburring and rounding according to claim 14. The dependent claims specify advantageous developments of the invention.

[0011] According to the invention, a tool for machining an object is specified. The tool has a plurality of finger layers, each extending in a layer surface. Each of the finger layers has a plurality of fingers. Advantageously, each layer surface has at least three, particularly preferably at least five fingers. The layer surface can be regarded as the surface spanned by the fingers of the finger layer, advantageously in an undeflected state of the fingers. The spanned surface can advantageously be regarded as the convex hull of the fingers in the layer surface. According to the invention, the finger layers are arranged one behind the other in such a way that the layer surfaces of adjacent finger layers overlap at least in some areas. This can, but does not necessarily, mean that the fingers also overlap.This means that a projection of a finger layer in a direction perpendicular to the finger layer onto the adjacent finger layer overlaps or intersects with the adjacent finger layer. There is therefore an area of the adjacent finger layer that is covered by the projection. The overlap of the adjacent layers can, but does not have to, be complete. For example, with the block shape of the tool described below, there can be a complete overlap, whereas with the plate-shaped and cylindrical geometries of the tool described below, there is normally only a partial overlap. The layer surfaces are preferably flat. Advantageously, the finger layers do not overlap each other even when the fingers are not deflected.

[0012] According to the invention, each of the finger layers has a plurality of fingers. These fingers are designed such that they can be bent from an undeflected state in a direction that is on the layer surface of the corresponding finger layer, i.e., one that is not parallel to the layer surface or in the layer surface. For example, the direction in which the fingers are bendable can be perpendicular to the layer surface of the corresponding finger layer. Preferably, the direction in which a finger is bendable in each position of the finger can be perpendicular to a longitudinal direction of the finger and / or perpendicular to a surface of the finger. The surface of the finger is preferably its largest surface, i.e., the surface over which it extends flatly. The undeflected state of a finger is the state in which the finger lies completely in the layer surface of the finger layer of which it is the finger. The finger can, for example, be regarded as a bendable tongue.

[0013] According to the invention, the fingers are each flat and, in the undeflected state, extend along the layer surface of the finger layer to which they belong. The fact that the fingers are flat means that they are flat, meaning that they have a larger, normally much larger, extension in the direction of the layer surface of the finger layer to which they belong than in the direction perpendicular to the layer surface.

[0014] The fingers of the same finger layer preferably extend parallel to one another in the undeflected state. Advantageously, the fingers are elongated, which means that in one direction in their layer surface they have a significantly greater extension than in the direction perpendicular to this in the layer surface and advantageously also than in the direction perpendicular to this perpendicular to the layer surface. The direction in which the fingers have the greater extension in the layer surface is referred to below as the longitudinal direction of the corresponding finger. In such a configuration, the longitudinal directions of the fingers of the same finger layer are parallel to one another in the undeflected state. Advantageously, the edges of the fingers of the same finger layer also run parallel to one another in the undeflected state. However, if the fingers have edges that are not straight in the undeflected state, it is also sufficient if the longitudinal directions run parallel.

[0015] The extension of the fingers in the layer surface perpendicular to the longitudinal direction is referred to as the width of the fingers. The extension of the fingers in the direction perpendicular to the layer surface is referred to as the thickness. Preferably, the length is greater than the width, and the width is greater than the thickness of the fingers.

[0016] According to the invention, immediately adjacent fingers of the same finger layer have a distance greater than zero from one another in the undeflected state. This distance is preferably constant, i.e. has the same value over the entire length of the fingers. The distance can be measured, for example, from one edge of one finger to the nearest edge of the adjacent finger. The arrangement of the fingers within a finger layer can therefore be regarded as comb-shaped. The fingers are therefore preferably not produced from the finger layer by a single straight cut, but by removing a partial area of the layer from which the finger layer is produced between adjacent fingers.

[0017] A working direction can advantageously be defined in the tool. This is then the direction in which the tool is moved during intended use. A intended movement can, for example, be a movement over a straight edge, which occurs in such a way that the fingers graze the straight edge with their largest surface, whereby the straight edge is preferably parallel to this largest surface of the fingers when grazing. The fingers can then preferably be bent from the layer surface in a direction to which the working direction is parallel or tangential. The layer planes then advantageously extend at a non-zero angle or perpendicular to the working direction.

[0018] The spacing of adjacent fingers of the same layer results in high finger flexibility. This makes it possible to arrange the finger layers directly behind one another or closely spaced, without the need for support material such as fleece between the finger layers. This results in a high finger density, resulting in high grinding performance. This allows for higher feed rates with the same edge rounding, or greater edge rounding at the same feed rate.

[0019] Advantageously, the fingers of the same finger position are elastically bendable from the undeflected state independently of one another. The fact that the fingers are elastically bendable from the undeflected state independently of one another means that applying a force to exactly one of the fingers, which bends that finger, does not result in other fingers of the same position being bent. The fact that the finger is elastically bendable from the undeflected state means that when the force is removed, the finger essentially returns to the undeflected state. This results in a high degree of adaptability to any workpiece contour with a high finger density.

[0020] It should be noted that the geometries of the tool, the fingers, and the finger layers described here may represent an idealization in the sense that many of the materials used for the finger layers are, in practice, plastically deformable to a certain extent. As a result, the tool or fingers may, due to manufacturing or use, have or assume shapes that deviate to some extent from the geometries described here. However, a person skilled in the art will undoubtedly be able to associate such deviating shapes with the geometries described here, so that these deviating shapes should be considered to be covered by the protection.

[0021] The arrangement according to the invention makes it possible to realize the tool without support material between the finger layers. Therefore, preferably, no material is present between the fingers of adjacent finger layers. Preferably, no material is present between the fingers of adjacent finger layers in the region in which the fingers are bendable.

[0022] The finger layers can advantageously be held by a support structure arranged at one end of the fingers. The finger layers can, for example, be glued into this support structure.

[0023] In an advantageous embodiment of the invention, the fingers of at least some of the finger layers can be arranged such that their projection onto a respective adjacent one of the finger layers falls into the distances between the fingers of the adjacent finger layer and / or next to the fingers of the adjacent finger layer. The projection can advantageously occur in a direction at a non-zero angle or perpendicular to the layer surface of one of the corresponding finger layers, or in the direction in which the fingers can be bent from their undeflected state. Projection in the working direction can also be possible. Advantageously, the projection and the finger layer onto which it is projected do not overlap, so the projection advantageously falls completely between the fingers of the respective adjacent layer.Such an arrangement can be used to increase the flexibility of the tool, since the bending of the fingers is not hindered by the adjacent finger layer. In an advantageous embodiment of the invention, the fingers of all adjacent finger layers can be arranged offset from one another in this way.

[0024] It can be advantageous if the distance between adjacent fingers of the same layer is greater than the width of these fingers, i.e., the extension of the fingers in the direction in which they are adjacent. If such finger layers are arranged as described above so that the fingers of adjacent finger layers are offset from one another, this ensures that the fingers engage between the fingers of the adjacent finger layer when bent, maintaining a distance from them, without rubbing against them.

[0025] In an advantageous embodiment of the invention, the fingers of at least some of the finger layers can overlap with the fingers of the adjacent finger layers. This overlap can therefore consist in particular in the projection of the fingers of the respective finger layer onto the adjacent finger layer in a direction perpendicular to the finger layer. The overlap can be complete or partial for one or both fingers. In this way, the strength of the tool can be increased. By combining this embodiment with the previously described embodiment of offset fingers, the strength of the tool can be flexibly adjusted.

[0026] In the case where fingers of adjacent layers are arranged overlapping as described, it may be advantageous to provide a spacing between the adjacent layers whose fingers are arranged overlapping one another. For example, a spacer layer may be arranged between each of the adjacent layers, the dimensions of which advantageously correspond to the dimensions of the adjacent finger layers.

[0027] In the case of overlapping fingers as described above, the fingers of two, three, four, or more immediately adjacent finger layers can overlap on a common plane in a projection perpendicular to one of these finger layers. This means that the fingers of the two, three, four, or more finger layers can be positioned one behind the other in a direction perpendicular to the layer surface of one of these layers.

[0028] The strength of the tool can also be adjusted via the distance between adjacent finger layers. Adjacent finger layers can advantageously be directly adjacent to one another or can be spaced apart by a distance of one, two, three or more finger layer thicknesses. The distance between two finger layers is the distance between the layer surfaces of these finger layers, measured perpendicular to the layer surface. The distance is preferably measured at the point on the finger layers to which the fingers are attached. This is particularly relevant for the cylindrical arrangement of the layers to be described below, where the adjacent finger layers can enclose a non-zero angle with one another. In a plate-shaped arrangement, the described distance is preferably measured at the inner edge of the layers, i.e. at the edge facing the center of the plate.

[0029] The finger layers are preferably flat in the undeflected state, so that the layer surfaces of the finger layers are flat.

[0030] In an advantageous embodiment of the invention, the finger layers can be inclined relative to a direction in which the tool is moved past the object to be machined. This means that the finger layers can preferably enclose an angle of greater than 0° and less than 180° with a line along which the finger layers are arranged one behind the other. Preferably, the layers can enclose an angle of greater than -45° and less than +45° with said line.

[0031] Preferably, the fingers each have at least one grinding and / or abrasive surface. This grinding and / or abrasive surface is preferably a surface of the corresponding finger that is parallel to the surface in which the corresponding finger extends.

[0032] Preferably, the fingers can be designed as abrasive materials on a backing. The abrasive material can be applied to a carrier and, together with the carrier, form the grinding and / or abrasive surface.

[0033] If the fingers are designed as abrasive materials on a backing, the backing can advantageously comprise or consist of cotton, polyester, or polycotton. However, the finger layers themselves can also comprise or consist of an abrasive and / or grinding material. In this case, no abrasive or grinding material needs to be applied to the fingers.

[0034] The grinding and / or abrasive material of the fingers can advantageously have grain sizes greater than or equal to grain 12, preferably greater than or equal to grain 50, preferably greater than or equal to grain 100 and / or less than or equal to grain 320, preferably less than or equal to grain 240, preferably less than or equal to grain 150.

[0035] In an advantageous embodiment of the invention, adjacent finger layers can be configured such that, when placed one above the other, these finger layers completely fill a rectangular area. This configuration can be produced particularly efficiently by cutting the two adjacent finger layers out of a rectangular layer using a cutting line.

[0036] Advantageously, the length of the fingers can be greater than or equal to 20 mm, preferably greater than or equal to 30 mm, particularly preferably greater than or equal to 40 mm, and / or less than or equal to 150 mm, preferably less than or equal to 120 mm, preferably less than or equal to 90 mm, preferably less than or equal to 70 mm, preferably less than or equal to 60 mm, particularly preferably less than or equal to 50 mm. Advantageously, all fingers of the tool have the same length.

[0037] In an advantageous embodiment of the invention, the individual fingers can themselves be slit. Slits can be provided in the fingers, penetrating the fingers and extending parallel to the longitudinal direction of the fingers. Advantageously, several slits can also be arranged one behind the other along a straight line, whereby the straight line can run parallel to the longitudinal axes of the fingers. Advantageously, several parallel slits or several parallel rows of slits can be provided in each finger.

[0038] The width of the fingers, ie an extension of the fingers in the direction in which the fingers of the same layer are arranged next to one another, can preferably be greater than or equal to 2 mm, preferably greater than or equal to 5 mm, particularly preferably greater than or equal to 7 mm and / or less than or equal to 20 mm, preferably less than or equal to 15 mm, particularly preferably less than or equal to 10 mm.

[0039] A thickness of the finger layers or the fingers without any abrasive applied should preferably be greater than or equal to 0.5 mm, preferably greater than or equal to 1 mm and / or less than or equal to 2 mm, preferably less than or equal to 1 mm.

[0040] In an advantageous embodiment of the invention, all finger layers can be arranged parallel to one another, so that a surface spanned by the finger layers is rectangular perpendicular to the longitudinal directions of the fingers. The entire tool preferably has a block shape.

[0041] In this block-shaped configuration, the tool can advantageously have an extension of greater than or equal to 50 mm, preferably greater than or equal to 70 mm, and / or less than or equal to 100 mm, preferably less than or equal to 80 mm, in the direction in which the fingers of the same layers are arranged next to one another. This extension is referred to herein as the width of the tool.

[0042] A depth or length of the tool, i.e. an extension of the tool in the direction in which the finger layers are arranged one behind the other, can preferably be greater than or equal to 50 mm, preferably greater than or equal to 60 mm and / or less than or equal to 80 mm, preferably less than or equal to 70 mm.

[0043] In a further advantageous embodiment of the invention, which shall be referred to here as a plate-shaped embodiment, the finger layers can be arranged one behind the other along a closed circular line, with the layer surfaces being perpendicular to the circular line and the fingers being perpendicular to the surface of a circle described by the circular line, i.e., the plane in which the circle runs. In this embodiment, the finger layers can be arranged on a circular support, with the individual fingers being perpendicular to a circular surface of the support.

[0044] In a plate-shaped design of the tool, it can be advantageous if, in addition to the aforementioned finger layers, a plurality of further finger layers are provided, which are arranged along a further closed circular line. The further closed circular line can run concentrically to the circular line of the aforementioned first finger arrangement and have a larger or smaller radius than the aforementioned first circular line. The further finger layers can therefore run inside or outside the first-described finger layers. The fingers of the further finger layers are preferably the same length as the fingers of the first finger layers and are arranged such that the ends of the further fingers run in the same planes as the ends of the fingers of the first finger layers. This design of the invention enables more uniform machining, since the density of the fingers in a plate-shaped arrangement decreases radially outwards.If the inner radius of the arrangement of the first finger layers is selected to be larger, the additional finger layers can be arranged inside the arrangement of the first finger layers, with the number of additional finger layers being selected to be fewer than the number of the first finger layers. In this way, an excessive increase in the density of fingers in the radially inward direction can be avoided. Similarly, the additional finger layers could also be arranged in larger numbers around the first finger layers, thus avoiding a decrease in the density of fingers towards the outside.

[0045] Advantageously, in the case of a plate-shaped arrangement, the tool can have a diameter in the plane of the circular line of greater than or equal to 50 mm, preferably greater than or equal to 80 mm, preferably greater than or equal to 100 mm, preferably greater than or equal to 115 mm, preferably greater than or equal to 125 mm, preferably greater than or equal to 150 mm and / or less than or equal to 1500 mm, preferably less than or equal to 1000 mm, preferably less than or equal to 400 mm, preferably less than or equal to 250 mm, preferably less than or equal to 200 mm.

[0046] In a plate-shaped arrangement, the finger layers can have a width of greater than or equal to 15 mm, preferably greater than or equal to 20 mm, preferably greater than or equal to 30 mm and / or less than or equal to 100 mm, preferably less than or equal to 65 mm, preferably less than or equal to 60 mm, preferably less than or equal to 50 mm, preferably less than or equal to 40 mm in a direction in which the fingers of the same layers are arranged next to one another.

[0047] In an advantageous embodiment, a plurality of finger layers can be combined to form a block. Advantageously, each block can have a depth of greater than or equal to 20 mm, preferably greater than or equal to 35 mm, preferably greater than or equal to 45 mm, and / or less than or equal to 70 mm, preferably less than or equal to 55 mm, in the direction in which the finger layers are arranged one behind the other.

[0048] In a further advantageous embodiment of the invention, the finger layers can be arranged one behind the other along a closed circular line, wherein the layer surfaces are again perpendicular to the circular line and wherein the fingers extend radially in their longitudinal direction to an axis which runs through the center of the circular line and is perpendicular to the circular area enclosed by the circular line. This embodiment of the tool is referred to below as a cylindrical embodiment. The tips of the fingers can lie on a common cylindrical surface. Likewise, the points on the fingers to which they are attached can lie on a common cylindrical surface. The finger layers are normally at an angle to one another around the aforementioned axis. The fingers can preferably be arranged on a cylindrical support structure.

[0049] A diameter of the tool in the cylindrical configuration, measured between tips of the fingers opposite to the axis in the direction radial to the circular line or axis, can advantageously be greater than or equal to 50 mm, preferably greater than or equal to 100 mm, particularly preferably greater than or equal to 200 mm and / or less than or equal to 400 mm, preferably less than or equal to 300 mm.

[0050] A width of the tool, i.e. its extension in the direction perpendicular to the circular area enclosed by the closed circular line or in the direction of the axis, can preferably be greater than or equal to 20 mm, preferably greater than or equal to 100 mm, preferably greater than or equal to 500 mm, preferably greater than or equal to 1,500 mm and / or less than or equal to 2,500 mm, preferably less than or equal to 2,000 mm, particularly preferably less than or equal to 1,700 mm.

[0051] The flexibility of the tool can be adjusted or varied in a variety of ways. Firstly, flexibility can be influenced by selecting the profile of the finger positions or fingers. Furthermore, it is optionally possible to influence the adaptability of the tool by arranging the fingers as described. Furthermore, it is optionally possible to introduce gaps, for example, using spacers, in the base area of the fingers, i.e., in the area adjacent to the finger attachment, given a given stiffness of the fingers. This allows the bendable length of the fingers to be changed and thus the stiffness of the fingers.

[0052] In addition, laminated main finger layers can optionally be used to influence the stiffness of the elements.

[0053] In an advantageous embodiment of the invention, the outermost fingers of each finger layer can be tapered downwards toward the edge of the finger layer. Advantageously, the fingers can become shorter toward the edge. Advantageously, the fingers can also become narrower toward the edge. This design achieves a smoother grip.

[0054] Advantageously, the tool according to the invention is a tool for deburring edges of a metallic workpiece and / or a tool for rounding edges of a metallic workpiece, i.e. a deburring or rounding tool.

[0055] The invention also provides a method for removing secondary burrs on one or more edges of a metallic workpiece and / or for rounding one or more edges of a metallic workpiece. A tool, as described above, is moved over the edge to be machined so that the finger layers brush the edge. By brushing the edge with the finger layers, a secondary burr on the edge is removed and / or the edge is rounded.

[0056] Preferably, the tool is moved in a direction perpendicular to the edge to be machined. Preferably, the tool is also moved in a direction that is not parallel to the finger positions in the undeflected state. Preferably, the direction can be perpendicular to the finger positions in the undeflected state.

[0057] According to the invention, a method for deburring and rounding one or more edges of a metallic workpiece is also specified, wherein a tool, as described above, is moved over the edge in such a way that the finger layers brush the edge, so that the brushing of the edge by the finger layers removes a primary burr on the edge and the edge is rounded. Here, too, the tool is advantageously moved in a direction perpendicular to the edge to be machined. Advantageously, here, too, the tool can be moved in a direction perpendicular to the layer surfaces in the undeflected state. The design of the tool according to the invention makes it possible both to remove a primary burr and to round off the edge. The primary burr removal and the rounding can be effected in a single step.

[0058] The invention significantly increases the tool's removal rate compared to state-of-the-art tools of the same size. This allows for more pronounced edge rounding within a shorter time, improving production efficiency. Furthermore, the increased performance enables the integration of process steps that are performed independently in the prior art. For example, the process steps of primary burr removal, secondary burr removal, and edge rounding can be combined into a single process thanks to the invention's high removal rate. This opens up entirely new machine configurations.

[0059] Some optional embodiments of the invention are described below: 1. A tool for machining an object, comprising a plurality of finger layers, each extending in a layer surface, wherein the finger layers are arranged one behind the other such that the layer surfaces of adjacent finger layers overlap at least in regions, wherein each finger layer has a plurality of fingers, wherein the fingers of the finger layers are bendable from an undeflected state in a direction on the layer surface of the corresponding finger layer, wherein the fingers of the finger layers are each flat and extend in the corresponding layer surface in the undeflected state, wherein adjacent fingers of the same finger layer are spaced from one another in the undeflected state by a distance greater than zero. 2. A tool according to the preceding optional embodiment, wherein the fingers of the same finger layer are elastically bendable independently of one another from the undeflected state. 3.Tool according to one of the preceding optional embodiments, wherein no material is present between the fingers of adjacent finger layers. 4. Tool according to one of the preceding optional embodiments, wherein the fingers of the same finger layer extend parallel to one another in the undeflected state. 5. Tool according to one of the preceding optional embodiments, wherein the fingers of at least some of the finger layers are arranged in a projection onto an adjacent one of the finger layers in the distances between the fingers or next to the fingers of this adjacent finger layer. 6. Tool according to one of the preceding optional embodiments, wherein the distance between adjacent fingers of the same layer is greater than a width of these fingers in a direction in which these fingers are adjacent. 7.Tool according to one of the preceding optional embodiments, wherein the fingers of at least some of the finger layers are arranged in a projection onto an adjacent one of the finger layers in a direction perpendicular to its surface, overlapping with the fingers of this adjacent finger layer. 8. Tool according to the preceding optional embodiment, wherein the fingers of two, three, four, or more of the finger layers overlap in a projection in a direction perpendicular to one of these finger layers onto a common plane. 9. Tool according to one of the preceding optional embodiments, wherein adjacent finger layers are directly adjacent to one another or are spaced apart from one another by a distance of one, two, three, or more thicknesses of the finger layers. 10. Tool according to one of the preceding optional embodiments, wherein the layer surfaces are flat in the undeflected state.Tool according to one of the preceding optional embodiments, wherein the finger layers form an angle of greater than zero degrees and less than 180 degrees with a line along which the finger layers are arranged one behind the other. 12. Tool according to the preceding optional embodiment, wherein the fingers each have at least one grinding and / or abrasive surface that is parallel to the area in which the corresponding finger extends. 13. Tool according to the preceding optional embodiment, wherein the fingers are designed as abrasive means on a backing, wherein the abrasive means is applied to the grinding and / or abrasive surface. 14. Tool according to one of the preceding optional embodiments, wherein the fingers have cotton, polyester, or polycotton as a backing. 15.Tool according to one of the preceding optional embodiments, wherein adjacent finger layers are designed such that these finger layers, when placed one above the other, completely fill a rectangular area. 16. Tool according to one of the preceding optional embodiments, wherein a length of the fingers in the direction perpendicular to the direction in which the fingers of the same finger layer are arranged next to one another and perpendicular to the direction in which the finger layers are arranged one behind the other is greater than or equal to 20 mm, preferably greater than or equal to 30 mm, particularly preferably greater than or equal to 40 mm and / or less than or equal to 150 mm, preferably less than or equal to 120 mm, preferably less than or equal to 90 mm, preferably less than or equal to 70 mm, preferably less than or equal to 60 mm, particularly preferably less than or equal to 50 mm. 17.Tool according to one of the preceding optional embodiments, wherein a width of the fingers in the direction in which the fingers of the same layer are arranged next to one another is greater than or equal to 1 mm, preferably greater than or equal to 2 mm, preferably greater than or equal to 3 mm, preferably greater than or equal to 5 mm and / or less than or equal to 20 mm, preferably less than or equal to 15 mm, particularly preferably less than or equal to 10 mm, preferably less than or equal to 7 mm. 18. Tool according to one of the preceding optional embodiments, wherein all of the finger layers are arranged parallel to one another one behind the other and a surface spanned by the finger layers is rectangular perpendicular to the layer surfaces. 19.Tool according to the preceding optional embodiment, wherein the tool has a width of greater than or equal to 20 mm, preferably greater than or equal to 70 mm and / or less than or equal to 100 mm, preferably less than or equal to 80 mm, preferably less than or equal to 65 mm, particularly preferably equal to 50 mm, in the direction in which the fingers of the same layers are arranged next to one another. 20. Tool according to one of the two preceding optional embodiments, wherein the tool has a depth of greater than or equal to 30 mm, preferably greater than or equal to 40 mm and / or less than or equal to 70 mm, preferably less than or equal to 60 mm, particularly preferably equal to 55 mm, in the direction in which the finger layers are arranged one behind the other.Tool according to one of the preceding optional embodiments, wherein the finger layers are arranged one behind the other along a closed circular line or a segment of a circular line, wherein the layer surfaces are perpendicular to the circular line and wherein the fingers are perpendicular to the surface of a circle described by the circular line. 22. Tool according to the preceding optional embodiment, wherein additionally a plurality of further finger layers are arranged along a further closed circular line or a segment of a further circular line, wherein the further circular line is arranged concentrically to said circular line and has a larger or smaller radius than said circular line. 23.Tool according to one of the two preceding optional embodiments, wherein the tool has a diameter of greater than or equal to 50 mm, preferably greater than or equal to 80 mm, preferably greater than or equal to 100 mm, preferably greater than or equal to 115 mm, preferably greater than or equal to 125 mm, preferably greater than or equal to 150 mm and / or less than or equal to 1500 mm, preferably less than or equal to 1000 mm, preferably less than or equal to 400 mm, preferably less than or equal to 250 mm, preferably less than or equal to 200 mm. 24.Tool according to one of the three preceding optional embodiments, wherein the finger layers have a width of greater than or equal to 15 mm, preferably greater than or equal to 20 mm, preferably greater than or equal to 30 mm and / or less than or equal to 100 mm, preferably less than or equal to 60 mm, preferably less than or equal to 50 mm, preferably less than or equal to 40 mm, in the direction in which the fingers of the same layers are arranged next to one another. 25. Tool according to one of the optional embodiments 21 to 24, wherein a plurality of the finger layers are each combined to form a block which preferably has a depth of greater than or equal to 20 mm, preferably greater than or equal to 35 mm, preferably greater than or equal to 45 mm and / or less than or equal to 70 mm, preferably less than or equal to 55 mm, in the direction in which the finger layers are arranged one behind the other.Tool according to one of the preceding optional embodiments, wherein the finger layers are arranged one behind the other along a closed circular line, wherein the layer surfaces are perpendicular to the circular line, and wherein the fingers extend with their longitudinal direction radially to an axis that runs through a center point of the circular line and is perpendicular to the circular line. 27. Tool according to the preceding optional embodiment, wherein a diameter of the tool in the direction radial to the circular line is greater than or equal to 50 mm, preferably greater than or equal to 100 mm, preferably greater than or equal to 200 mm and / or less than or equal to 400 mm, preferably less than or equal to 300 mm. 28.Tool according to one of the two preceding optional embodiments, wherein a width of the tool in the direction perpendicular to the closed circular line is greater than or equal to 20 mm, preferably greater than or equal to 100 mm, preferably greater than or equal to 500 mm, preferably greater than or equal to 1500 mm and / or less than or equal to 2500 mm, preferably less than or equal to 2000 mm, preferably less than or equal to 1700 mm. 29. Tool according to one of the preceding optional embodiments, wherein at least some or all of the fingers have at least one slot. 30. Tool according to one of the preceding optional embodiments, wherein the tool is a tool for deburring and / or rounding edges of a workpiece, preferably a metallic workpiece, and / or is a deburring and / or rounding tool. 31.Method for removing secondary burrs on an edge of a workpiece and / or for rounding an edge of a workpiece, wherein a tool according to one of the preceding claims is moved relative to the workpiece over the edge so that the finger layers brush the edge so that a secondary burr on the edge is removed and / or the edge is rounded by the brushing of the edge by the finger layers. 32. Method for deburring and rounding an edge of a workpiece, wherein a tool according to one of the preceding claims is moved relative to the workpiece over the edge so that the finger layers brush the edge so that a primary burr on the edge is removed and the edge is rounded by the brushing of the edge by the finger layers. 33. Method according to one of the two preceding optional embodiments, wherein the workpiece is a metallic workpiece.

[0060] The invention will be explained below using a few examples. Like reference numerals denote like or corresponding features. The features shown in the examples can also be implemented independently of the specific example and can be combined between different examples. It shows:

[0061] Figure 1 shows a roller-shaped embodiment of a tool according to the invention, Figure 2 shows a plate-shaped embodiment of a tool according to the invention, Figure 3 shows a block-shaped embodiment of a tool according to the invention, Figure 4 shows a plate-shaped embodiment of a tool according to the invention in a plan view, Figure 5 shows a plate-shaped embodiment of a tool according to the invention with two rows in a plan view, Figure 6 shows a schematic representation of an arrangement of fingers in a tool according to the invention, Figure 7 shows a schematic representation of an arrangement of fingers in a tool according to the invention, Figure 8 shows a schematic representation of an arrangement of fingers in a tool according to the invention, Figure 9 shows a process flow for deburring and edge rounding according to the prior art, Figure 10 shows an optional inclination of the layers relative to the direction of movement, Figure 11 shows an optional embodiment of the invention with fingers beveled at the edge,Figure 12 shows an optional embodiment of two layers of the invention with fingers having serrated edges, and Figure 13 shows an optional embodiment of a finger layer with slotted fingers.

[0062] Figure 1 shows a cylindrical configuration of a tool according to the invention in a complete view and an enlarged section. The tool has a plurality of finger layers 1a, 1b, and 1c, each extending over a layer area. For the sake of clarity, only three of the finger layers 1a, 1b, and 1c will be explicitly named below, while the figure itself shows a plurality of additional finger layers, for which the statements regarding finger layers 1a, 1b, and 1c apply accordingly.

[0063] The finger layers 1a, 1b and 1c are arranged one behind the other in such a way that they overlap with the layer surfaces of adjacent finger layers 1a, 1b, 1c. In the Figure 1In the roller shape shown, adjacent finger layers 1a, 1b, 1c are at a non-vanishing angle to each other, so that the overlap is not a complete overlap.

[0064] Each of the finger positions 1a, 1b, 1c has a plurality of fingers 2a, 2b, and 2c. For the sake of clarity, only fingers 2a, 2b, and 2c will be explicitly named, while the tool has a multitude of other fingers, for which the statements regarding fingers 2a, 2b, and 2c apply accordingly. Figure 1 fingers 2aq, 2b, 2c all have the same length.

[0065] The fingers 2a, 2b and 2c are bendable in a direction perpendicular to the layer surface of the corresponding finger layer 1a, 1b, 1c from an undeflected state. Figure 1 the fingers 2a, 2b, 2c are in the undeflected state.

[0066] The fingers 2a, 2b, 2c are each flat and, in the undeflected state shown, extend in the layer surface of the corresponding finger layer 1a, 1b, 1c. Fingers 2a, 2b, 2c of the same finger layer 1a, 1b, 1c extend parallel to one another in the undeflected state. The longitudinal directions of the fingers 2a, 2b, 2c of the same finger layer 1a, 1b, 1c are thus parallel to one another. Adjacent fingers 2a, 2b, 2c of the same finger layer 1a, 1b, 1c are spaced from one another by a distance greater than zero in the undeflected state.

[0067] In the Figure 1In the cylindrical configuration of the tool according to the invention shown, the finger layers 1a, 1b, 1c are arranged one behind the other along a closed circular line. The layer surfaces of the finger layers 1a, 1b, 1c are each perpendicular to the circular line. The fingers 2a, 2b, 2c extend radially with their longitudinal direction to an axis that runs through a center of the circular line and is perpendicular to the circle described by the circular line.

[0068] All finger layers 1a, 1b, 1c are arranged on a common support structure 3. The fingers 2a, 2b, 2c of all finger layers 1a, 1b, 1c are attached at one end to the support structure 3. In the cylindrical configuration of the tool according to the invention according to Figure 1 the support structure 3 has a cylindrical shape around that axis as cylinder axis, relative to which the fingers 2a, 2b, 2c extend radially with their longitudinal direction.

[0069] Figure 2shows a plate-shaped design of a tool according to the invention. In the plate-shaped design of the Figure 2 A plurality of finger layers 1a, 1b, 1c, each extending in a layer area, are arranged one behind the other along a circular line such that the layer areas of adjacent finger layers 1a, 1b, 1c overlap. Due to the plate-shaped arrangement, the overlap is not complete. Here, too, for the sake of clarity, reference is made to only three of the finger layers 1a, 1b, 1c, with the above-mentioned also applying accordingly to the other finger layers.

[0070] Each of the finger positions 1a, 1b, 1c has a plurality of fingers 2a, 2b, 2c. For the sake of clarity, only three of the fingers 2a, 2b, 2c are discussed, while the same applies to the other fingers shown.

[0071] The fingers 2a, 2b, 2c are bendable in a direction perpendicular to the layer surface of the corresponding finger layers 1a, 1b, 1c from an undeflected state. Figure 2 The fingers are shown in the undeflected state. The fingers 2a, 2b, 2c are each flat and extend in the undeflected state in the layer surface of the corresponding finger layer 1a, 1b, 1c. Here too, the fingers 2a, 2b, 2c of the same finger layer 1a, 1b, 1c extend parallel to each other in the undeflected state and all have the same length. Also in the Figure 2 In the example shown, adjacent fingers 2a, 2b, 2c of the same finger position 1a, 1b, 1c have a distance from each other of greater than zero in the undeflected state.

[0072] In the Figure 2In the plate-shaped configuration shown, the finger layers 1a, 1b, 1c are arranged one behind the other along a closed circular line, wherein the layer surfaces of the finger layers 1a, 1b, 1c are perpendicular to the circular line and wherein the fingers 2a, 2b, 2c are perpendicular to the surface of a circle described by the circular line. The finger layers 1a, 1b, 1c are arranged on a support structure 3, which in the plate-shaped configuration of the Figure 2can have a flat, circular shape. The surface of the circular shape lies in the plane described by the closed circular line. The fingers 2a, 2b, 2c are arranged with one end on the support structure 3 and are perpendicular to the surface of the support structure 3 with their longitudinal directions. In use, the plate-shaped configuration can be moved over an edge of a workpiece by rotating the tool about an axis passing through the center of the closed circular line, which axis is parallel to the longitudinal directions of the fingers 2a, 2b, 2c.

[0073] Figure 3shows a block-shaped design of a tool according to the invention. Again, the tool has a plurality of finger layers 1a, 1b, 1c, of which, for the sake of clarity, only three layers 1a, 1b, 1c will be named, while the same applies to the other layers shown. The finger layers 1a, 1b, 1c are arranged one behind the other in such a way that the layer surfaces of adjacent finger layers 1a, 1b, 1c overlap. In the block-shaped design, this overlap can be complete. Furthermore, in the block-shaped design, the layer surfaces of all finger layers 1a, 1b, 1c can completely overlap.

[0074] Again, each of the finger layers 1a, 1b, 1c has a plurality of fingers 2a, 2b, 2c, of which only three fingers 2a, 2b, 2c are to be addressed, while the above applies accordingly to the other fingers shown. Since all fingers 2a, 2b, 2c of all finger layers 1a, 1b, 1c in the example shown have the same length, the overall tool has an essentially cubic shape.

[0075] In the block-shaped embodiment of the invention, the fingers 2a, 2b, 2c of the finger layers 1a, 1b, 1c are also each flat and, in the undeflected state, extend within the corresponding layer surface, which is flat in this case. Again, the fingers 2a, 2b, 2c are bendable from a undeflected state. The figure also shows the fingers 2a, 2b, 2c in the undeflected state.

[0076] The fingers 2a, 2b, 2c of the same finger position 1a, 1b, 1c extend parallel to each other in the undeflected state. Adjacent fingers 2a, 2b, 2c of the same finger position 1a, 1b, 1c have a distance greater than zero from each other in the undeflected state.

[0077] In the Figure 3 In the embodiment shown, the finger layers 1a, 1b, 1c are arranged on a common support structure 3, which in the block-shaped embodiment of the Figure 3 can have a rectangular shape. In the example shown, the fingers 2a, 2b, 2c of all finger layers 1a, 1b, 1c are perpendicular to the plane defined by the rectangle of the support structure 3.

[0078] Figure 4 shows a further example of a plate-shaped design of the tool according to the invention according to Figure 2 . In Figure 4The tool is shown in a plan view perpendicular to the plane in which the circular line runs. The finger positions 1a, 1b, 1c extend radially with respect to the center of the circular line. The finger positions 1a, 1b, 1c are shown here as solid lines, but they have the Figure 2 described fingers 2a, 2b, 2c, which are not resolved here. It can be seen that the density of the finger layers 1a, 1b, 1c and thus the density of the fingers 2a, 2b, 2c decreases from the inside to the outside. To counteract the resulting inhomogeneity of the finger density, a plate-shaped workpiece as in Figure 5shown. In this example, in addition to the finger positions 1a, 1b, 1c, a plurality of further finger positions 1b, 1e, 1f are provided, which are arranged along a further closed circular line with a smaller radius. Here again, only three of the further finger positions 1d, 1e, 1f are addressed, while a plurality of further finger positions are arranged along the inner circular line, to which the statements regarding the finger positions 1d, 1e, 1f apply accordingly.

[0079] The further closed circular line, along which the finger layers 1d, 1e, 1f are arranged, is arranged concentrically to the first circular line and has a smaller radius than this. The two circular lines run in the same plane. The inner arrangement of finger layers 1d, 1e, 1f has a smaller number of finger layers 1d, 1e, 1f, whereby the finger density in the area of the inner finger layers 1d, 1e, 1f is reduced compared to a configuration in which the outer finger layers 1a, 1b, 1c would be continued into the area in which Figure 5 the inner finger layers 1d, 1e, 1f are arranged. The Figure 5 The tool shown enables a more homogeneous machining on a larger area than the one shown in Figure 4 shown tool with the same external dimensions.

[0080] The Figures 6, 7 and 8show examples of various possible arrangements of fingers and finger layers in the tool according to the invention. The fingers are shown schematically as straight lines. The straight lines can be regarded as the base or attachment line of the corresponding finger on a support structure 3 or as the upper sides of the fingers at the end of the fingers opposite the support structure 3. The finger layers are shown in the Figures 6, 7 and 8 parallel to each other, which is true for the block-shaped and the roller-shaped design. In a plate-shaped design of the tool, the finger positions would be shown in the Figures 6, 7 and 8 have an angle to each other. However, since this angle is very small, it would hardly be visible in the figures, so that the Figures 6, 7 and 8 can also be considered applicable to the plate-shaped design.

[0081] Figure 6shows an arrangement of fingers. Only fingers 2a to 2f are explicitly named. The same applies to the other fingers shown.

[0082] In Figure 6 The fingers of adjacent finger layers 1a to 1e are arranged offset from one another. This means that the fingers 2a, 2b, 2c of the finger layer 1a are arranged in a projection onto the adjacent finger layer 1b at the distances between the fingers 2d, 2e, 2f of this adjacent finger layer. The projection is in a direction perpendicular to the layer surface of the finger layer 1a or 1b. Similarly, Figure 6 the fingers of all adjacent finger positions 1a to 1e are arranged in the said projection in the distances between the fingers or next to the fingers of the adjacent finger position 1a to 1e.

[0083] Figure 7shows a possible arrangement of fingers 2a to 2l in finger layers 1a to 1i. The fingers 2a, 2b, 2c of finger layer 1a overlap, in a projection onto the adjacent finger layer 1b, in a direction perpendicular to its surface with the fingers 2g, 2h, and 2i of this finger layer 1b. Accordingly, the fingers of finger layer 1c also overlap with the fingers of finger layers 1a and 1b. The fingers 2a to 2i of finger layers 1a to 1c are thus arranged one behind the other in a direction perpendicular to the surface of these finger layers.

[0084] The fingers 2j to 2l of the finger layers 1d to 1f, which adjoin the layers 1a to 1c, are arranged in a projection in the direction perpendicular to the layer surface of the finger layers 1a to 1c or 1d to 1f at the intervals between the adjacent layer 1c. On the other hand, the fingers 2j to 2l of the layers 1d to 1f are arranged one behind the other or overlapping, as described above for the layers 1a to 1c. The fingers of the layers 1g to 1i are in turn arranged behind the fingers 2a to 2i of the layers 1a to 1c, thus overlapping them as described above. They are therefore arranged at the intervals between the fingers of the layers 1d to 1f or next to the fingers of these layers in the projection.

[0085] Figure 8 shows an arrangement of fingers 2a to 2f in finger positions 1a to 1d. The fingers 2a to 2f of adjacent finger positions 1a to 1d fall again as in Figure 6shown in the projection into the distances between the adjacent finger positions 1a to 1d.

[0086] In all figures, all fingers have the same width and the same distance from each other. This is optional but advantageous. While in Figures 6 and 7 the width of the fingers is equal to the distance between adjacent fingers of the same layer, in the Figure 8 In the example shown, the fingers 2a to 2f have a smaller width than the distance between adjacent fingers 2a to 2f of the same layer 1a to 1d. In this way, fingers 2d to 2f of one finger layer 1b fall at a distance 4 between the fingers 2a to 2c of the adjacent finger layer 1a or 1c. The fingers 2d to 2f can therefore be bent without rubbing or bumping against the fingers 2a to 2c of adjacent finger layers 1a to 1d.

[0087] Figure 9shows an example of a process for deburring and rounding the edges of a workpiece. In a state Z1, a workpiece is present with a primary burr. A primary burr can, for example, have arisen because the workpiece was punched out of a sheet metal or because parts were punched out of the workpiece. The prior art now provides for a step S1 in which the primary burr is removed. The primary burr removal can, for example, be carried out using a circulating belt with an abrasive surface. In many cases, the primary burr is not completely removed but is at least partially transformed into a so-called secondary burr. Step S1 can therefore lead to a state Z2 in which a workpiece is present with a secondary burr. This must then be followed by a step S2 for secondary burr removal, which leads to a deburred workpiece in a state Z3.For many applications, it is necessary for the edges of the deburred workpiece to be rounded to a certain extent, for example, to prevent chipping of a later coating. The rounding of the edges is achieved by an edge rounding step S3, which is applied to the deburred workpiece. The result of this step S3 is a state Z4 in which the workpiece is edge-rounded.

[0088] Figure 10 shows an optional inclination of the layers relative to the direction in which the tool is moved during use. The upper part of the image shows a top view corresponding to Figure 6 . the lower left part of the image shows a sectional view along the section line AA drawn in the upper part of the image and the lower right part of the image shows a sectional view along the line BB drawn in the upper part of the image.

[0089] The direction of movement of the tool during use is perpendicular to the direction along which the fingers of the same layer are arranged next to each other—in the upper part of the image, to the right or left. The sectional views show that layers 1a to 1e are inclined at an angle other than 90° to the direction of movement. Adjacent layers 1a to 1d are inclined in opposite directions. In the example shown, layers 1a, 1b, and 1c are inclined to the right, and layers 1d and 1e to the left.

[0090] Figure 11 shows an embodiment of the invention according to the Figure 6 shown embodiment. The top part of the image shows the position of the fingers 1a to 1h from above, the middle part of the image a side view of the surface of the fingers and the lower part of the image a position of the fingers 1a to 1h from above. Figure 11 The embodiment shown differs from that shown in Figure 6shown embodiment in that Figure 11 The outermost fingers 2a, 2d, 2g, and 2h of each finger layer are tapered toward the edge of the finger layer. The fingers therefore become shorter toward the edge. The fingers can also become narrower toward the edge. This design results in a smoother grip.

[0091] Figure 12 shows an example of an embodiment of the finger layers 1a to 1d, in which the finger layers have serrated edges. The basic shape of the finger layer corresponds to that in Figure 3 shown, with the difference that the edges of fingers 2a, 2b, 2c are jagged. Part A shows one of the finger layers 1A.

[0092] Partial Figure 12B shows a starting layer from which the finger layers 1a and 1b can be produced by cutting. A cutting line (here optionally serrated) is introduced into the layer, alternating between long serrated sections and straight short sections. In this way, two finger layers 1a and 1b are separated from the starting layer, each with elongated fingers 2a, 2b, and 2c.

[0093] Partial figure 12C shows a top view of the two finger layers 1a and 1b produced according to part figure 12B, which here are Figure 3 are arranged one behind the other. It can be seen that the layers overlap in the projection area of their points. The fingers of the same finger layer 1a or 1b are arranged with their longitudinal directions parallel to each other.

[0094] Figure 13shows an example of an optional embodiment of a finger layer 1a in which the fingers are each slotted. For this purpose, three rows of slots 5 arranged one behind the other in the longitudinal direction of the fingers are introduced into the fingers 2a, 2b, 2c. The slots run with their longitudinal direction parallel to the longitudinal direction of the fingers 2a, 2b, 2c. In the example shown, the finger layer 1a has five fingers, each having three rows of slots, with each row of slots having four slots 5 arranged one behind the other.

[0095] The tool according to the invention can now be used in a method for removing secondary burrs on an edge of a metallic workpiece, i.e., in step S2. Alternatively or additionally, it can also be used in step S3 for rounding an edge of a metallic workpiece. The tool is moved over the edge of the workpiece such that the finger layers touch the edge to be machined, thereby removing the secondary burr and / or rounding the edge.

[0096] The tool according to the invention can be used particularly advantageously in a process in which primary burrs on the edges of the tool are removed and the edges are rounded in a single step. Using the tool according to the invention, the workpiece can thus be machined from state Z1 to state Z4 in just one step. For this purpose, the tool is again moved over the edge in such a way that the finger layers touch the edge, thereby removing the primary burrs and rounding the edge.

Claims

1. A tool for machining an object, comprising a plurality of finger layers, each extending in a layer surface, wherein the finger layers are arranged one behind the other such that the layer surfaces of adjacent finger layers overlap at least in regions, wherein each finger layer has a plurality of fingers, wherein the fingers of the finger layers are bendable from an undeflected state in a direction on the layer surface of the corresponding finger layer, wherein the fingers of the finger layers are each flat and extend in the corresponding layer surface in the undeflected state, wherein adjacent fingers of the same finger layer are spaced from one another by a distance greater than zero in the undeflected state.

2. Tool according to the preceding claim, wherein the fingers of the same finger position are elastically bendable independently of one another from the undeflected state.

3. Tool according to one of the preceding claims, wherein there is no material between the fingers of adjacent finger layers.

4. Tool according to one of the preceding claims, wherein the fingers of the same finger position extend parallel to each other in the undeflected state, 5. Tool according to one of the preceding claims, wherein the fingers of at least some of the finger layers are arranged in a projection onto an adjacent one of the finger layers in the distances between the fingers or next to the fingers of this adjacent finger layer.

6. A tool according to any one of the preceding claims, wherein a width of the fingers is equal to the distance between adjacent fingers of the same layer or the distance between adjacent fingers of the same layer is greater than a width of these fingers in a direction in which these fingers are adjacent.

7. Tool according to one of the preceding claims, wherein the fingers of at least some of the finger layers are arranged in a projection onto an adjacent one of the finger layers in a direction perpendicular to its surface so as to overlap with the fingers of this adjacent finger layer.

8. Tool according to the preceding claim, wherein the fingers of two, three, four or more of the finger layers overlap in a projection in a direction perpendicular to one of these finger layers onto a common plane.

9. Tool according to one of the preceding claims, wherein adjacent finger layers are directly adjacent to one another or are spaced apart from one another by a distance of one, two, three or more thicknesses of the finger layers.

10. Tool according to one of the preceding claims, wherein all of the finger layers are arranged parallel to one another and a surface spanned by the finger layers is rectangular perpendicular to the layer surfaces.

11. Tool according to one of the preceding claims, wherein the finger layers are arranged one behind the other along a closed circular line or a segment of a circular line, wherein the layer surfaces are perpendicular to the circular line and wherein the fingers are perpendicular to the surface of a circle described by the circular line.

12. Tool according to one of the preceding claims, wherein the finger layers are arranged one behind the other along a closed circular line, wherein the layer surfaces are perpendicular to the circular line and wherein the fingers extend with their longitudinal direction radially to an axis which runs through a center of the circular line and is perpendicular to the circular line.

13. A method for removing secondary burrs on an edge of a workpiece and / or for rounding an edge of a workpiece, wherein a tool according to one of the preceding claims is moved relative to the workpiece over the edge so that the finger layers brush the edge so that by brushing the edge by the finger layers a secondary burr on the edge is removed and / or the edge is rounded.

14. A method for deburring and rounding an edge of a workpiece, wherein a tool according to any one of the preceding claims is moved relative to the workpiece over the edge so that the finger layers brush the edge, so that by brushing the edge by the finger layers a primary burr on the edge is removed and the edge is rounded.

15. Method according to one of the two preceding claims, wherein the workpiece is a metallic workpiece.

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