Grinding tool, manufacturing method and application of grinding tool, assembly and method for machining workpiece

Abstract

The invention relates to a grinding tool (1) for grinding at least one brake disc (25) coated with a hard material, the grinding tool (1) comprising a base body (2) and a grinding liner (3), the grinding liner (3) comprising diamond particles (4) and CBN particles (5), the diamond particles (4) being arranged on the base body (2), and the CBN particles (5) being arranged on the grinding liner (3). The diamond particles (4) and the CBN particles (5) are bonded in multiple layers in a sintered metal bond and / or synthetic resin bond (18) in the grinding liner (3), the particle mixing ratio between the diamond particles (4) and the CBN particles (5) being substantially 1: 1, and the particle size (19) of the diamond particles (4) and / or the CBN particles (5) being greater than 50 [mu] m.

Description

Technical Field

[0001] The invention relates to a grinding tool according to the features of the preamble of claim 1 and to a method for producing such a grinding tool.

[0002] The invention further relates to an assembly having such a grinding tool, a method for machining a workpiece in an assembly, and the use of the grinding tool for grinding brake disks coated with hard material. Background Art

[0003] Grinding tools of the type mentioned at the outset are used primarily for machining brake disks, in particular motor vehicle brake disks, with a more wear-resistant coating, wherein machining by grinding is necessary in order to meet the requirements of a standardized surface property of the brake disk.

[0004] In order to reduce fine dust emissions, especially in connection with electric vehicles, a wear-resistant carbide-containing layer of approximately 0.5 mm thick is applied to both sides of the brake disk base body. Hard materials such as tungsten carbide (WC), molten tungsten carbide, titanium carbide (TiC), chromium carbide (Cr3C2), niobium carbide (NbC) and metallic binders (e.g. stainless steel, titanium aluminide) are used as coating components.

[0005] After coating, the brake disc is ground with a grinding tool to meet the geometric requirements (e.g. defined brake disc width, remaining layer thickness, end runout, plane parallelism) and surface requirements (e.g. absence of porosity, roughness, waviness, polished image). Usually, the layers applied on both sides are machined simultaneously with two grinding tools in a double-sided flat method. Here, the machining allowance on each side is usually between 0.1 and 0.3 mm.

[0006] The first difficulty in using such grinding tools is that different brake disc manufacturers apply different hard materials and binders to different base bodies in different mixing ratios. If brake discs with different coatings or friction linings are to be ground or a specific quality of coating or friction lining is to be achieved, it is usually necessary to change the grinding tool on the grinding machine or at least to grind successively with different grinding tools, as shown in DE 10 20 21 13 2 468 B3. This can lead to a great deal of effort, which is associated with long processing times and high costs. Another disadvantage is that a plurality of different grinding tools are required to process different coatings.

[0007] The second difficulty when using a grinding tool is that it is excessively worn when machining a wear-resistant brake disc. Therefore, although the grinding tool of US10875152B2 has a grinding lining composed of diamond particles and CBN (cubic boron nitride) particles, which seems to advantageously combine the high hardness and reaction inertness of diamond particles and the low chip coverability of CBN particles, the grinding tool of US10875152B2 is equipped with a grinding lining, which is composed of only a single coating or particle layer, thereby limiting the durability of the grinding tool. Because once the single particle layer is worn, the grinding tool cannot be used and must be replaced. Due to the single-layer structure as a so-called "single layer", the grinding tool of US10875152B2 can be regarded as a heterogeneous tool in any case.

[0008] Contrary to the grinding tool of US10875152B2, the grinding tool of JP2008200780A is configured as multi-layer, but has a very high proportion of CBN particles or has a very small proportion of diamond particles. Through this unfavorable particle mixing ratio, due to the increased wear of the CBN particles, the durability of the grinding tool is also disadvantageously limited. Summary of the invention

[0009] The object of the present invention is therefore to provide a grinding tool which is improved compared to the prior art and with which all conventional brake disks coated with hard material can be processed reliably, durably and economically and with which the required geometry and surface quality of the workpiece to be processed can be achieved as the only grinding tool.

[0010] This object is achieved by the features of claim 1, namely by a grinding tool having a base body and a grinding layer, wherein the grinding layer comprises diamond particles and CBN particles, wherein the particle mixing ratio between diamond particles and CBN particles is essentially 1:1, that is to say in particular taking into account possible manufacturing tolerances, and the average particle size of the diamond particles and / or CBN particles is in particular greater than 50 μm.

[0011] A first major advantage of the grinding tool according to the invention, which is preferably designed as a grinding disk, is that all conventional brake disks coated with hard material can be processed with the same grinding tool. When changing the coating or changing the brake disk, it is not necessary to change the grinding tool. Compared with the solutions of the prior art, the process time and process costs can thereby be significantly reduced.

[0012] The grinding tool according to the invention therefore makes it possible to meet the requirements for the geometry and surface properties of brake disks, which are standardized in particular by EU regulations, even for different coatings or friction linings.

[0013] The grinding lining is a three-dimensional body that grinds or removes the coated brake disc by means of at least one of its outer surfaces or grinding surfaces. Here, the grinding lining wears away along its grinding surface over time.

[0014] Compared to conventional grinding tools having only diamond particles or only CBN particles in a metal bond, the grinding disk according to the invention has the great advantage that it has a 40% to 50% lower wear (0.007 mm to 0.008 mm per friction lining per brake disk) and thus a significantly longer service life.

[0015] Compared to grinding tools with a single-layer grinding lining composed of diamond particles and CBN particles, the service life or use time of the grinding tool according to the invention is many times longer. In this case, the diamonds in the grinding insert are crushed and the CBN is broken, wherein the CBN protects and supports the diamonds. In this case, the current grinding lining is also called a self-sharpening grinding lining, because the uppermost worn particle layer is followed by a further particle layer. The full functionality of the grinding tool is thus maintained over the entire service life at a constant grinding power.

[0016] A further improvement compared to conventional diamond grinding tools is that the drive power of a grinding machine carrying the grinding tool according to the invention can be reduced by approximately 30%.

[0017] A further improvement compared to conventional diamond grinding tools is that significantly lower grinding pressures are required to efficiently machine brake discs, in particular those coated with hard materials. The elastic deformation of the brake disc is also reduced, so that the brake disc can be ground with a flatness of 0.005 mm (usually > 0.010 mm), which has not been achieved to date.

[0018] The particle mixing ratio between diamond particles and CBN particles is preferably understood to be the mass ratio between diamond particles and CBN particles, wherein the particle mixing ratio can be regarded as an average value and production tolerances are also taken into account, so that the ratio is not exactly 1:1 in every partial section.

[0019] The grain size of the diamond and / or CBN grains is preferably understood to mean an average value or mean value, in particular an average grain diameter as defined, for example, in accordance with the ISO 6106 standard, in particular in the sense of an average grain size.

[0020] The grain size, ie the average grain size, represents in particular 80% to 95% of the diamond grains and / or CBN grains present.

[0021] As an alternative to a purely metal bond or a purely synthetic resin bond, it is possible that the diamond particles and the CBN particles are bonded in a mixed bond comprising metal and resin.

[0022] Further advantageous embodiments of the invention are defined in the dependent claims.

[0023] It is particularly preferably provided that the diamond particles and / or CBN particles, preferably the diamond particles and CBN particles, have an especially average particle size of 51 μm to 300 μm, preferably 91 μm to 252 μm.

[0024] It can also be provided that the diamond particles and / or the CBN particles, preferably the diamond particles and the CBN particles, have an average particle size of more than 74 μm, particularly preferably more than 88 μm.

[0025] It can also be provided that the diamond particles and / or the CBN particles, preferably the diamond particles and the CBN particles, have an average particle size of less than 180 μm.

[0026] Preferably, it is provided that the grain size ratio between the CBN grains and the diamond grains is 0.3 to 2.8, particularly preferably 0.5 to 1.0.

[0027] This means that the CBN particles are particularly preferably at least half as large as the diamond particles and at most as large as the diamond particles.

[0028] It is particularly preferred that the grinding layer comprises grinding media diamond and CBN and preferably fillers bonded into a metal bond or a metal-containing bond. Here, the grinding media of the grinding layer is 50% diamond and 50% CBN according to the invention (except for minimal manufacturing technical deviations).

[0029] In a preferred embodiment, the grinding liner is composed of 10-35 volume % of diamond and CBN, 50-90 volume % of a metal binder and the remainder of the grinding liner is a filler.

[0030] It is particularly preferably provided that the grinding insert is designed in the form of an annular shape, preferably in the form of an annular cylinder or cone. The grinding insert can also be referred to in this case as a sliding ring.

[0031] The grinding layer is applied to at least one composite surface of the basic body or of a carrier fastened to the basic body, which composite surface is preferably annular and / or flat and / or arranged orthogonally to the rotation axis of the grinding tool.

[0032] The composite surface can also be of inclined, conical and / or cylindrical design and / or be arranged obliquely with respect to the axis of rotation of the grinding tool.

[0033] However, the composite surface can also be designed to be variable, so that the grinding layer also has a correspondingly variable shape, in particular the layer height varies within a range of values.

[0034] It is also possible for the grinding layer and / or the base body and / or the carrier to be designed edge-shaped or stepped, in particular along the composite surface.

[0035] The grinding lining has a grinding surface, wherein the grinding surface is that outer side of the grinding lining which is in contact with a workpiece to be ground, in particular a friction lining or a brake disk coating.

[0036] Preferably, the grinding surface is arranged orthogonally to the axis of rotation of the grinding tool and / or is of substantially flat design, wherein the grinding surface can have a natural roughness due to the diamond and CBN particles.

[0037] Through grinding, the lining height on the grinding surface of the grinding lining decreases over time.

[0038] In a preferred embodiment, the in particular annular grinding insert has:

[0039] An outer diameter of 200 to 900 mm, preferably 260 to 800 mm, and / or

[0040] A lining width of 5 to 40 mm, preferably 15 to 25 mm, and / or

[0041] Lining height of 5 to 20 mm, preferably 6 to 10 mm.

[0042] The layer width is preferably understood to be the difference between the outer diameter and the inner diameter of the grinding layer, wherein the outer diameter of the grinding layer preferably corresponds at least to the side wall outer diameter of the basic body.

[0043] Particularly preferably, the lining width is less than 20 mm, in particular less than 16 mm, particularly preferably less than 12 mm.

[0044] In a particularly preferred embodiment, the lining width is 6 to 8 mm.

[0045] The inner diameter of the grinding lining is preferably larger than the inner diameter of the side wall of the basic body. However, the inner diameter can also be as large as or smaller than the inner diameter of the side wall.

[0046] The outer diameter of the grinding layer is preferably equal to or greater than the outer diameter of the side wall or the outer diameter of the basic body.

[0047] Preferably, these and all other values ​​are considered constant values ​​taking into account manufacturing tolerances.

[0048] However, it is also conceivable that the outer diameter, the layer width and / or the layer height are variable, for example polygonal along the grinding layer.

[0049] In this case, the at least one layer is preferably designed to be essentially homogeneous, wherein the homogeneity is an average homogeneity based on the particles of the grinding medium, in particular the diamond particles and CBN particles present.

[0050] In a particularly preferred embodiment, the grinding layer is composed of a plurality of segments which are preferably separated from one another by gaps, in particular in order to allow removal of grinding material, to provide passive cooling during the grinding process and / or to ensure precise grinding.

[0051] Preferably, the gaps between the segments extend substantially radially with respect to the axis of rotation of the grinding tool.

[0052] In a preferred exemplary embodiment, the grinding layer has between 85 and 135 segments, preferably between 90 and 125 segments, particularly preferably between 96 and 120 segments.

[0053] In particular, the segments are arranged regularly tangentially about the axis of rotation, preferably extending over a rotation angle of between 2.6° and 4.2°, preferably between 2.8° and 4.0°, particularly preferably between 3.0° and 3.8° with respect to the axis of rotation.

[0054] In other words, the segment division is approximately 2.6° to 4.2°, preferably 2.8° to 4.0°, particularly preferably 3.0° to 3.8°.

[0055] The minimum distance between the segments is preferably at least 0.7 mm, particularly preferably at least 1.0 mm.

[0056] In a first variant, the gap completely separates the grinding layer, so that the grinding layer is composed of individual segments, in particular, which are spaced apart from one another by the gap.

[0057] In this first variant, the segments are preferably applied individually to the base body.

[0058] In a second variant, the slot only partially cuts through the grinding layer, so that the grinding layer is designed in one piece and / or is applied integrally to the base body.

[0059] However, it is also conceivable that the separated segments are in contact with one another, ie no gaps are present.

[0060] It is particularly preferably provided that the grinding insert is applied and / or fastened to the base body by sintering and / or by means of a binder, preferably an adhesive, a synthetic resin or the like.

[0061] It is also conceivable to produce the connection between the base body and the grinding insert by means of welding, soldering and / or galvanic coating.

[0062] The grinding layer can also be applied to a carrier that is fastened to the base body (preferably by means of screws). The carrier makes it possible, for example, to replace the grinding layer after the end of its service life without having to replace the entire grinding tool.

[0063] It is particularly preferably provided that the base body is designed in a pot-shaped manner with a bottom and side walls adjoining the bottom, the bottom preferably having a centrally arranged hole. In this case, the grinding tool can also be referred to as a pot-shaped grinding disc.

[0064] In a preferred embodiment, the base body has an opening for accommodating connecting means, in particular a pin and / or a screw, which opening preferably:

[0065] is of substantially cylindrical configuration, and / or

[0066] has a longitudinal axis arranged parallel to the axis of rotation of the grinding tool, and / or

[0067] The arrangement is preferably regularly spaced apart from one another along at least one circle concentric to the axis of rotation.

[0068] The opening is used in particular for the precise fastening of the grinding tool on a grinding machine, in particular on a spindle of a grinding machine, in particular a vertical double-disc grinding machine.

[0069] Particularly preferably, the opening has a thread, so that the grinding tool can be screwed onto a spindle of the grinding machine.

[0070] It is preferably provided that the basic body has at least one stripping opening for, in particular, temporarily accommodating a stripper, wherein the stripper guided through the stripping opening assists in releasing and / or separating the grinding tool from the grinding machine.

[0071] Particularly preferably, the stripping opening has a thread, so that a screw can be passed through and the grinding tool can be pressed out and / or removed from the spindle.

[0072] In a preferred embodiment, the base body has three peel-off openings.

[0073] It is particularly preferably provided that the main body consists of metal, in particular steel and / or aluminum.

[0074] However, the main body can also be formed from ceramic, synthetic resin and / or fiber-reinforced plastic, for example a plastic containing glass fibers and / or carbon fibers.

[0075] Preferably, the base body has at least one recess for accommodating a measuring tool for measuring the layer height of the grinding layer.

[0076] The recess can be designed in an annular manner and / or as individual cutouts and / or can be arranged along the side wall and / or the outer side of the main body.

[0077] Protection is also claimed for a component having at least one grinding tool and at least one workpiece to be machined by means of the at least one grinding tool, in particular a brake disk coated with a hard material, preferably at least two grinding tools are provided and the workpiece to be machined is arranged between the at least two grinding tools, particularly preferably the at least two grinding tools are oriented symmetrically relative to the workpiece and the grinding linings of the at least two grinding tools face the workpiece.

[0078] Furthermore, a method is claimed for machining a preferably rotating workpiece, preferably a brake disk coated with a hard material, in an assembly, wherein the workpiece clamped on a spindle is preferably ground on both sides by the at least one grinding tool, preferably the at least two grinding tools, by means of rotating the grinding tools about their respective rotation axes.

[0079] This means that the preferably rotating workpiece is preferably machined on both sides by at least two grinding tools, in particular so that during machining or grinding a symmetrical application of pressure to the workpiece occurs and no undesired deformation of the workpiece occurs.

[0080] It is also conceivable to machine the workpiece at multiple locations on both sides in each case with two grinding tools or at least one grinding tool pair.

[0081] A workpiece can be machined simultaneously and / or successively by a plurality of grinding tool pairs.

[0082] A method for producing a grinding tool according to the invention is also claimed:

[0083] providing a substrate;

[0084] providing a preferably segmented grinding liner comprising diamond particles and CBN particles,

[0085] wherein the particle mixing ratio between the diamond particles and the CBN particles is substantially 1:1, and

[0086] wherein the average particle size of the diamond particles and / or CBN particles is greater than 50 μm;

[0087] The grinding layer is applied, preferably sintered and / or bonded, to the base body or to a carrier body fastened to the base body.

[0088] The provision of the grinding lining is particularly preferably carried out by the following method steps:

[0089] Providing a mixture consisting of the diamond particles, CBN particles, the metal bond and / or synthetic resin bond and preferably the filler;

[0090] In particular, the mixture is extruded under controlled pressure conditions and / or temperature conditions.

[0091] Furthermore, the use of the grinding tool for grinding at least one brake disk coated with a hard material is claimed.

[0092] Further advantages and details of advantageous embodiments of the invention are apparent from the drawings and the associated description of the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] Here it is shown:

[0094] Figure 1 shows a cross section of a preferred embodiment of a grinding tool according to the invention,

[0095] Figure 2 shows a cut-out of a grinding lining of a grinding tool according to the invention, and

[0096] Figure 3 A section through an assembly with a grinding tool according to the invention is shown. DETAILED DESCRIPTION

[0097] Figure 1 The cross section of a preferred embodiment of a grinding tool 1 according to the invention is shown, which has a base body 2 and a grinding layer 3 which is applied to the base body 2 preferably by sintering and / or by means of a binder, preferably an adhesive.

[0098] In this preferred embodiment, the grinding tool 1 has:

[0099] a tool height 24 of 35 to 65 mm, preferably 45 to 55 mm, and / or

[0100] a base height 14 of 35 to 50 mm, preferably 40 to 45 mm, and / or

[0101] An outer diameter 6 of the grinding layer 3 and / or an outer diameter 22 of the side wall of the base body 2 of 350 to 800 mm, preferably 380 to 420 mm.

[0102] In this exemplary embodiment, grinding layer 3 is applied to at least one composite surface 17 of base body 2 , which is preferably embodied in the form of an annular surface and / or flat and / or is arranged orthogonally to rotation axis 10 of grinding tool 1 .

[0103] In this preferred embodiment, the grinding lining 3 is designed in an annular manner as a sliding ring. Figure 1The outer diameter 6 , the layer width 7 and the layer height 8 of the grinding layer 3 are shown.

[0104] In a particularly preferred embodiment, the outer diameter 6 is 400 mm, the lining width 7 is 6 mm and the lining height 8 is 8 mm.

[0105] Furthermore, grinding surface 9 of grinding layer 3 is preferably of substantially flat design and / or is arranged orthogonally to rotation axis 10 of grinding tool 1 .

[0106] In this first exemplary embodiment, steps or edges are present in base body 2 along composite surface 17 , composite surface 17 preferably being defined and / or delimited by a sidewall outer diameter 22 of base body 2 and an inner diameter 21 of grinding lining 3 .

[0107] Side wall outer diameter 22 of base body 2 is preferably the same size as outer diameter 6 of grinding layer 3 or smaller than or equal to this outer diameter.

[0108] This exemplary embodiment is a particularly preferred embodiment of grinding tool 1 as a pot-shaped grinding pad, wherein base body 2 is of pot-shaped design with a base 13 and side walls 15 adjoining base 13 .

[0109] In a particularly preferred embodiment of the base body 2 , the side wall outer diameter 22 is 400 mm, the side wall inner diameter 23 is 380 mm and the base height 20 of the base body 2 is 20 mm.

[0110] In this exemplary embodiment, the bottom 13 of the base body 2 has a centrally arranged hole 16 .

[0111] Figure 2 A schematically illustrated cutout of a grinding layer 3 on a grinding surface 9 of a grinding tool 1 according to the invention is shown, wherein the grinding layer 3 comprises diamond particles 4 and CBN particles 5, wherein the diamond particles 4 and CBN particles 5 are bonded in the grinding layer 3 in a multilayer manner in a sintered metal bond and / or a synthetic resin bond 18, and the particle mixing ratio between the diamond particles 4 and the CBN particles 5 is essentially 1:1, and the diamond particles 4 and / or the CBN particles 5 have an especially average particle size 19 greater than 50 μm, preferably 51 μm to 300 μm, particularly preferably 91 μm to 252 μm.

[0112] It is schematically indicated here that the particle size ratio between CBN particles 5 and diamond particles 4 is preferably 0.3 to 2.8, particularly preferably 0.5 to 1.0. For this purpose, for example, the particle sizes 19 of the CBN particles 5 and diamond particles 4 are plotted in some of the particles 4 , 5 .

[0113] The grinding layer 3 is particularly preferably formed from diamond particles 4, CBN particles 5, a metallic bond 18 and preferably a filler. However, it is also conceivable for the grinding layer to have other raw materials or materials.

[0114] Figure 3 A cross section of an assembly is shown, which has two grinding tools 1 and a workpiece 25 to be machined by means of the grinding tools 1, in particular a brake disk 25 having a hard material coating 29, wherein the workpiece 25 is arranged between the two grinding tools 1 and the two grinding tools 1 are symmetrically oriented relative to the rotation axis 26 of the workpiece 25 and the grinding linings 3 of the two grinding tools 1 are facing the workpiece 25.

[0115] When machining workpiece 25 , provision is preferably made for workpiece 25 to be rotated about its axis of rotation 26 and / or to be ground on both sides by two grinding tools 1 by means of a rotation of grinding tools 1 about their respective axis of rotation 10 .

[0116] The workpiece 25 is preferably fastened here on a rotatable workpiece spindle 27 of the grinding machine. The grinding tools 1 are each fastened on a rotatable tool spindle 28 of the grinding machine.

[0117] exist Figure 3 The rotation arrows assigned to the spindles 27, 28 shown in the figure should reflect the rotation direction of the spindles 27, 28. In the present embodiment, so-called co-directional grinding occurs because the tool spindle 28 carrying the grinding tool 1 has a rotation direction (corresponding to the counterclockwise direction in this case) opposite to the rotation direction (corresponding to the clockwise direction in this case) of the workpiece spindle 27 carrying the workpiece 25. Therefore, the velocity vectors of the contact surfaces of the grinding tool and the workpiece point in the same direction.

[0118] However, the workpiece 25 can also be machined by so-called back grinding, wherein the workpiece spindle 27 has the same direction of rotation as the at least one tool spindle 28. This means that all spindles 27, 28 have the same direction of rotation.

[0119] In principle, other and / or mutually different directions of rotation of the spindles 27 , 28 are also possible.

[0120] In the present machining concept, workpiece 25 is ground with cross-cutting, which means that there is no tilting of rotation axis 10 of the at least one grinding tool 1 relative to rotation axis 26 of workpiece 25. That is, rotation axes 10, 26 are oriented parallel to one another.

[0121] It is also conceivable that during machining of workpiece 25 there is an inclination of axes of rotation 10 , 26 relative to one another or that axes of rotation 10 , 26 are not parallel, so that no cross grinding occurs.

[0122] In this exemplary embodiment of a corresponding grinding tool 1 of the assembly, grinding layer 3 is composed of a plurality of segments 11 , which are preferably separated and / or spaced apart from one another by gaps 12 .

Claims

1. A grinding tool (1) for grinding at least one brake disc (25) coated with a hard material, wherein: The grinding tool (1) comprises a base body (2) and a grinding lining (3), wherein the grinding lining (3) comprises diamond particles (4) and CBN particles (5), wherein the diamond particles (4) and the CBN particles (5) are combined in the grinding lining (3) in a multilayer manner in a sintered metal bond and / or a synthetic resin bond (18), characterized in that the particle mixing ratio between the diamond particles (4) and the CBN particles (5) is substantially 1:1, and the particle size (19) of the diamond particles (4) and / or the CBN particles (5) is greater than 50 μm.

2. The grinding tool (1) according to claim 1, wherein: The particle size (27) of the diamond particles (4) and / or CBN particles (5) is 51 μm to 300 μm, preferably 91 μm to 252 μm.

3. The grinding tool (1) according to any one of the preceding claims, wherein: The particle size ratio between the CBN particles (5) and the diamond particles (4) is 0.3 to 2.8, preferably 0.5 to 1.

0.

4. The grinding tool (1) according to any one of the preceding claims, wherein: The grinding lining (3) is configured in an annular shape, in particular, The outer diameter (6) is 200 to 900 mm, preferably 260 to 800 mm, and / or The lining width (7) is 5 to 40 mm, preferably 15 to 25 mm, and / or The lining height (8) is 5 to 20 mm, preferably 6 to 10 mm, And / or, the grinding lining (3) has a grinding surface (9) which is substantially flat and / or arranged orthogonally to the axis of rotation (10) of the grinding tool (1).

5. The grinding tool (1) according to any one of the preceding claims, wherein The grinding lining (3) is composed of a plurality of segments (11), which are preferably spaced apart from one another by gaps (12), in particular the gaps (12) extend substantially radially with respect to the axis of rotation (10) of the grinding tool (1).

6. The grinding tool (1) according to any one of the preceding claims, wherein: The grinding insert (3) is applied to the base body (2) by sintering, soldering, welding and / or by means of a binder, preferably an adhesive.

7. The grinding tool (1) according to any one of the preceding claims, wherein: The base body (2) is designed in a pot-shaped manner with a base (13) and a side wall (15) adjoining the base (13), the base (13) preferably having a centrally arranged opening (16).

8. The grinding tool (1) according to any one of the preceding claims, wherein The base body (2) is made of metal, in particular steel and / or aluminum.

9. A component comprising at least one grinding tool (1) according to any one of claims 1 to 8 and at least one workpiece (25) to be machined by means of the at least one grinding tool (1), the workpiece being in particular a brake disk (25) coated with a hard material, preferably provided with at least two grinding tools (1) according to any one of claims 1 to 8, and the workpiece (25) to be machined being arranged between the at least two grinding tools (1), particularly preferably the at least two grinding tools (1) are oriented symmetrically relative to the workpiece (25) and the grinding linings (3) of the at least two grinding tools (1) are facing the workpiece (25).

10. A method for machining a workpiece (25), preferably a brake disk (25) coated with a hard material, in an assembly according to the preceding claim, wherein: A workpiece (25), preferably a rotating workpiece (25), is preferably ground on both sides by the at least one grinding tool (1), preferably the at least two grinding tools (1), by rotating the grinding tools (1) about their respective rotational axes (10).

11. A method for producing a grinding tool (1) according to any one of claims 1 to 8: Providing a substrate (2); providing a grinding lining (3) comprising diamond particles (4) and CBN particles (5), preferably formed from a plurality of segments (11), in, The particle mixing ratio between the diamond particles (4) and the CBN particles (5) is substantially 1:1, and Wherein, the particle size (19) of the diamond particles (4) and / or the CBN particles (5) is greater than 50 μm; The grinding layer (3) is applied, preferably sintered and / or bonded to the base body (2) or applied, preferably sintered and / or bonded to a carrier body fastened to the base body (2).

12. The method according to the preceding claim, wherein: The grinding lining (3) is provided by the following method steps: Providing a mixture consisting of the diamond particles (4), the CBN particles (5), the metal bond and / or the synthetic resin bond (18), and preferably the filler; The mixture is pressed together, in particular under controlled pressure conditions and / or temperature conditions.

13. Use of a grinding tool (1) according to any one of claims 1 to 8 for grinding at least one brake disk (25) coated with a hard material.

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