Tool for machining a brittle material, tool kit having such a tool, and method for designing such a tool

Abstract

The invention relates to a tool (1, 3) for machining a brittle material, in particular glass, hard metal, monocrystalline silicon and / or ceramic, having - an imaginary central axis (5), - a machining end (7), - a clamping end (9) opposite the machining end (7), and - a plurality of cutting edges (11), wherein - the plurality of cutting edges (11) run along an imaginary cutting edge course (13) in the region of the machining end (7), wherein - every two cutting edges (11) of the plurality of cutting edges (11) are spaced apart from one another by a cutting edge interruption (15) at an interruption position along the imaginary cutting edge course (13), wherein - the imaginary cutting edge course (13) has a total length (17), wherein - each cutting edge (11) of the plurality of cutting edges (11) in each case has a cutting edge length (19), and wherein - a ratio of the sum of the cutting edge lengths (19) to the total length (17) is less than 1 and - each cutting edge length (19) is shorter than 1.5 mm.

Description

[0001] MAP AL Dr. Kress SE & Co. KG

[0002] DESCRIPTION

[0003] Tool for machining a brittle material, tool kit with such a tool and method for designing such a tool

[0004] The invention relates to a tool for machining a brittle material, a tool kit with such a tool and a method for designing such a tool.

[0005] Grinding pins are known for processing brittle materials, especially glass. A disadvantage of such grinding pins is their slow processing speed.

[0006] It is also known that when processing brittle materials, especially glass, with conventional drilling and / or milling tools, pressure cracks occur in the material. Furthermore, when milling with a conventional milling tool, chipping occurs at the machined groove ends.

[0007] The invention is based on the objective of creating a tool for machining a brittle material, a tool kit with such a tool and a method for designing such a tool, whereby the aforementioned disadvantages do not occur, at least in part.

[0008] The problem is solved by providing the present technical teaching, in particular the teaching of the independent claims as well as the embodiments disclosed in the dependent claims and the description.

[0009] The problem is solved, in particular, by creating a tool for machining a brittle material with an imaginary central axis, a machining end, a clamping end opposite the machining end, and a plurality of cutting edges. The plurality of cutting edges run along an imaginary cutting edge path in the region of the machining end. Furthermore, each pair of cutting edges of the plurality of cutting edges is separated from each other by a cutting edge interruption at an interruption position along the imaginary cutting edge path. The imaginary cutting edge path has a total length, and each cutting edge of the plurality of cutting edges has a cutting edge length. The ratio of the sum of the cutting edge lengths to the total length is less than 1, and each cutting edge length is shorter than 1.5 mm.Advantageously, this makes it possible to machine the brittle material with a high material removal rate and consistent machining quality – especially compared to a conventional grinding pin. Furthermore, the at least one cutting edge interruption, particularly due to its arrangement between the cutting edges, reduces the pressure build-up of the tool on the workpiece, thus advantageously reducing and preferably preventing chipping and / or spalling at the workpiece edges – especially at a groove end – and / or cracks in the workpiece – especially at the bottom surface of a groove.

[0010] The fact that the majority of cutting edges in the area of ​​the end of the machining process run along an imaginary cutting edge path means, in the context of the present technical teaching, that the cutting edges of the majority of cutting edges in the area of ​​the end of the machining process run - one after the other - along a common imaginary cutting edge path.

[0011] In one embodiment, the tool has a plurality of cutting edge profiles, each with a plurality of cutting edges.

[0012] In particular, the tool is a tool for machining at least one material selected from the group consisting of glass, cemented carbide, monocrystalline silicon, ceramics, and any combination of the aforementioned materials. The cemented carbide preferably contains 6% cobalt.

[0013] Preferably, the tool has at least two cutting edges and at least one cutting edge interruption. In particular, exactly two cutting edges and exactly one cutting edge interruption are arranged along at least one, preferably each, cutting edge path. Alternatively, exactly three cutting edges and exactly two cutting edge interruptions are arranged along at least one, preferably each, cutting edge path. Alternatively, exactly four cutting edges and exactly three cutting edge interruptions are arranged along at least one, preferably each, cutting edge path. However, the tool can also have more than four cutting edges and more than three cutting edge interruptions along at least one, preferably each, cutting edge path. In particular, the at least one, preferably each, cutting edge path follows a spatial curve.

[0014] In one embodiment, particularly when the tool is a milling tool and / or a milling drill tool, the majority of cutting edges in the area of ​​the machining end run on a circumferential surface of the tool from an end face of the tool towards the clamping end along the imaginary cutting edge path.

[0015] In a further embodiment, particularly if the tool is a drilling tool and / or a milling drilling tool, the majority of cutting edges in the area of ​​the machining end run on the end face of the tool along the imaginary cutting edge extension on s.

[0016] In the context of the present technical teaching, the interruption position is defined in relation to a coordinate system of the tool.

[0017] In one embodiment, the interruption position is an axial interruption position, where the axial interruption position is defined as a position along the imaginary central axis. Then, the two cutting edges of the plurality of cutting edges are spaced apart from each other by the cutting edge interruption at the axial interruption position. In particular, a tool in which the cutting edges run on the circumferential surface of the tool has the cutting edge interruption at the axial interruption position. In particular, a tool that has a conically shaped end face and in which the cutting edges run along this end face also has the cutting edge interruption at the axial interruption position.

[0018] In a further embodiment, the interruption position is a radial interruption position, where the radial interruption position is defined as a position along an imaginary radius of the tool. Then, the two cutting edges of the plurality of cutting edges are spaced apart from each other by the cutting edge interruption at the radial interruption position. In particular, a tool that has a planar end face perpendicular to the central axis and in which the cutting edges run along this end face has the cutting edge interruption at the radial interruption position.Furthermore, a tool which has a conically shaped end face and in which the cutting edges run along this end face also has the cutting edge interruption at the radial interruption position - the interruption position in this case is both a radial and an axial interruption position.

[0019] Preferably, the ratio of the sum of the cutting edge lengths to the total length is less than or equal to 0.9. In particular, the ratio of the sum of the cutting edge lengths to the total length is less than or equal to 0.8. In particular, the ratio of the sum of the cutting edge lengths to the total length is less than or equal to 0.7. In particular, the ratio of the sum of the cutting edge lengths to the total length is less than or equal to 0.6. In particular, the ratio of the sum of the cutting edge lengths to the total length is less than or equal to 0.5. A ratio of 2 / 3 of the sum of the cutting edge lengths to the total length is particularly preferred.

[0020] In particular, the at least one cutting edge interruption along the imaginary cutting edge path has a cutting edge interruption length. A pulling force sum of one cutting edge interruption length and one immediately adjacent cutting edge length (i.e., a continuous pulling force consisting of the cutting edge interruption and the cutting edge is considered) of less than 1.5 mm is particularly preferred. Alternatively, the pulling force sum is less than or equal to 1.4 mm. Alternatively, the pulling force sum is less than or equal to 1.3 mm. Alternatively, the pulling force sum is less than or equal to 1.2 mm. Alternatively, the pulling force sum is less than or equal to 1.1 mm. Alternatively, the pulling force sum is less than or equal to 1.0 mm. Alternatively, the pulling force sum is less than or equal to 0.9 mm.

[0021] In particular, the cutting edge length of a cutting edge, in particular of each cutting edge, is at least 0.2 mm to a maximum of 1.3 mm, in particular at least 0.3 mm, in particular at least 0.4 mm, in particular at least 0.5 mm, in particular at least 0.6 mm, in particular up to a maximum of 1.2 mm, in particular up to a maximum of 1.1 mm, in particular up to a maximum of 1.0 mm, in particular up to a maximum of 0.9 mm, in particular up to a maximum of 0.8 mm, in particular up to a maximum of 0.7 mm, in particular up to a maximum of 0.6 mm, preferably 0.6 mm.

[0022] In particular, the cutting edge interruption length of a cutting edge interruption, in particular of each cutting edge interruption, is at least 0.2 mm to at most 0.5 mm, in particular at least 0.3 mm, in particular at least 0.4 mm, in particular up to at most 0.4 mm, preferably 0.4 mm. In particular, the ratio of the cutting edge interruption length to the cutting edge length – in particular of an immediately adjoining cutting edge, in particular of the continuous section – is at least 0.1 to at most 0.9. In particular, the ratio of the cutting edge interruption length to the cutting edge length is at least 0.2, in particular at least 0.3, in particular at least 0.4, in particular at least 0.5, in particular 0.6, in particular at least 2 / 3.Alternatively or additionally, the ratio of the cutting edge interruption length to the cutting edge length is in particular at most 0.8, in particular at most 0.7, in particular at most 2 / 3, in particular at most 0.6.

[0023] In particular, the ratio of the sum of the cutting edge interruption lengths to the total length is greater than or equal to 0.1. In particular, the ratio of the sum of the cutting edge interruption lengths to the total length is greater than or equal to 0.2.

[0024] In particular, the ratio of the sum of the cutting edge interruption lengths to the total length is greater than or equal to 0.3. In particular, the ratio of the sum of the cutting edge interruption lengths to the total length is greater than or equal to 0.4.

[0025] In particular, the ratio of the sum of the cutting edge interruption lengths to the total length is greater than or equal to 0.5. A ratio of 1 / 3 of the sum of the cutting edge interruption lengths to the total length is particularly preferred.

[0026] In a particularly preferred embodiment, each cutting edge length is at most 0.6 mm and each cutting edge interruption length is at least 0.3 mm and at most 0.5 mm, preferably 0.4 mm.

[0027] According to a further development of the invention, the cutting edge profile is straight, in particular linear. Alternatively, the cutting edge profile is helical or spiral.

[0028] Thus, the spatial curve is a straight line, a helix, or a spiral.

[0029] According to a further development of the invention, the cutting edge is arranged parallel to the imaginary central axis. Alternatively, the cutting edge is arranged at an angle to the imaginary central axis. Alternatively, the imaginary central axis and an imaginary extension of the cutting edge intersect. In the embodiment in which the imaginary central axis and the imaginary extension of the cutting edge intersect, the cutting edge is oriented such that the cutting edge and the imaginary central axis approach each other.

[0030] According to a further development of the invention, the tool is provided to have a plurality of imaginary cutting edge profiles in addition to the single cutting edge profile. A plurality of cutting edges extend along each of these multiple cutting edge profiles. Advantageously, this reduces the material removal volume per cutting edge profile and / or increases the machining speed of the tool. Furthermore, the plurality of cutting edge profiles advantageously reduces the pressure exerted by the tool on the workpiece, thus further reducing and preferably preventing chipping and / or spalling at the workpiece edges—particularly at a groove end—and / or cracks in the workpiece—particularly at the bottom surface of a groove.

[0031] In one embodiment, at least two cutting edge profiles, in particular all cutting edge profiles, of the majority of imaginary cutting edge profiles are aligned parallel to each other.

[0032] In a further embodiment, at least two cutting edge profiles, in particular all cutting edge profiles, of the majority of imaginary cutting edge profiles are aligned obliquely to each other.

[0033] In a further embodiment, at least two imaginary extensions of the cutting edge paths intersect, in particular all imaginary extensions of the cutting edge paths, or the majority of imaginary cutting edge paths. Thus, the imaginary cutting edge paths are aligned such that they approximate each other.

[0034] In one embodiment, the tool has a first cutting edge profile along its circumferential surface and a second cutting edge profile on its end face. At least two cutting edges of the plurality of cutting edges along the first cutting edge profile are then spaced apart from each other by a cutting edge interruption at a particularly axial interruption position. Furthermore, at least two cutting edges of the plurality of cutting edges along the second cutting edge profile are spaced apart from each other by the cutting edge interruption at a particularly radial interruption position. In particular, a milling drill tool has both an axial interruption position and a radial interruption position.

[0035] According to a further development of the invention, it is provided that at least two cutting edge interruptions, each assigned to a different cutting edge profile, are arranged at an identical interruption position.

[0036] In particular, the tool has a first cutting edge profile and a second cutting edge profile that differs from the first. A first cutting edge interruption of the first cutting edge profile is arranged at a first interruption position, and a second cutting edge interruption of the second cutting edge profile is arranged at a second interruption position, wherein the first interruption position and the second interruption position are identical. Preferably, the at least two interruption positions are arranged at the same axial interruption position. Alternatively or additionally, the at least two interruption positions are arranged at the same radial interruption position.

[0037] According to a further development of the invention, the tool comprises a first cutting edge profile group and a second cutting edge profile group as the plurality of cutting edge profiles. The first cutting edge profile group comprises a plurality of first cutting edge profiles, each of which has at least one cutting edge interruption at the first interruption position. Furthermore, the second cutting edge profile group comprises a plurality of second cutting edge profiles, each of which has at least one cutting edge interruption at the second interruption position. The first interruption position and the second interruption position are distinct from one another.Similarly, the tool can have at least one further cutting edge profile group with additional cutting edge profiles, for example a third, fourth or fifth cutting edge profile group with third, fourth or fifth cutting edge profiles respectively.

[0038] In particular, the cutting edge profile groups are designed either as open cutting edge profile groups or as closed cutting edge profile groups. In the context of this technical teaching, in an open cutting edge profile group, not all cutting edge profiles of the respective cutting edge profile group are arranged directly next to each other. Furthermore, in the context of this technical teaching, in a closed group, all cutting edge profiles of the respective cutting edge profile group are arranged directly next to each other.

[0039] In one embodiment, the tool has n closed cutting edge profile groups. Each closed cutting edge profile group is arranged in an angular sector with respect to the imaginary central axis of 360° / n±10°, in particular 360° / n. In particular, the angular sectors comprise 180°±10°, in particular 180°, for n=2, 120°±10°, in particular 120°, for n=3, 90°±10°, in particular 90°, and for n=5, 72°±10°, in particular 72°.

[0040] Preferably, the majority of first interruption positions are arranged on a first circular arc around the central axis, which is oriented perpendicular to the central axis. Furthermore, the majority of second interruption positions are arranged on a second circular arc around the central axis, which is oriented perpendicular to the central axis. Optionally, the further interruption positions of the additional cutting edge profiles from further cutting edge profile groups are each arranged on a further circular arc. The circular arcs are arranged in pairs at different axial positions of the imaginary central axis and / or the circular arcs have different radii in pairs.

[0041] Preferably, the number of first cutting edge profiles in the first cutting edge profile group is identical to the number of second cutting edge profiles in the second cutting edge profile group. Alternatively or additionally, the majority of third cutting edge profiles is identical to the majority of first cutting edge profiles. Optionally, the number of all subsequent cutting edge profiles in the further cutting edge profile groups is also identical.

[0042] Preferably, the first cutting edge profiles are arranged directly adjacent to one another, i.e., as a first closed cutting edge profile group. Alternatively or additionally, the second cutting edge profiles are arranged directly adjacent to one another, i.e., as a second closed cutting edge profile group. Optionally, all further cutting edge profile groups are also designed as closed groups. According to a further development of the invention, the cutting edge interruptions of the majority of cutting edge profiles are arranged along an imaginary helical line around the imaginary central axis. Advantageously, this further improves the machining quality, in particular reducing, and especially preventing, chipping at the machining edges of the workpiece.

[0043] In particular, the imaginary helix and the cutting edge profiles are designed in opposite directions. This advantageously further reduces, and in particular prevents, chipping at the machining edges of the workpiece.

[0044] In one embodiment, the imaginary helix is ​​right-handed. If the cutting edge profiles are tilted to the right relative to the central axis or are also right-handed, then the cutting edge interruptions and the cutting edge profiles are aligned. If the cutting edge profiles are tilted to the left relative to the central axis or are left-handed, then the cutting edge interruptions and the cutting edge profiles are aligned in opposite directions.

[0045] In an alternative embodiment, the imaginary helix is ​​left-handed. If the cutting edge profiles are tilted to the right relative to the central axis or are right-handed, the cutting edge interruptions and the cutting edge profiles are opposite in direction. If the cutting edge profiles are tilted to the left relative to the central axis or are also left-handed, the cutting edge interruptions and the cutting edge profiles are parallel in direction.

[0046] According to a further development of the invention, it is provided that the majority of cutting edges along the imagined cutting edge path are designed as main cutting edges, and that the tool additionally has at least one secondary cutting edge.

[0047] In particular, the at least one secondary cutting edge is a peripheral cutting edge, preferably with the at least one cutting edge profile comprising the main cutting edges arranged on the circumferential surface. Alternatively or additionally, the at least one secondary cutting edge is particularly a peripheral cutting edge, preferably with the at least one cutting edge profile comprising the main cutting edges arranged on the end face. In an optional embodiment, the at least one secondary cutting edge has a cutting edge interruption.

[0048] In one embodiment, the secondary cutting edge follows the cutting edge profile. Alternatively, the secondary cutting edge and the cutting edge profile are arranged offset from each other. In particular, each cutting edge profile is assigned a secondary cutting edge.

[0049] Particularly preferably, a tool in which the at least one cutting edge runs along the circumferential surface has no circumferential cutting edge without a cutting edge interruption. Furthermore, a tool in which the at least one cutting edge runs along an end face has no end cutting edge without a cutting edge interruption, is particularly preferably defined.

[0050] According to a further development of the invention, the cutting edge profiles each enclose a division angle in pairs, wherein the division angles have a relative size difference of at most 15%. Preferably, all division angles are identical.

[0051] A division angle m enclosed in pairs by two cutting edge profiles is understood to be an angle enclosed by two cutting edge profiles that are immediately adjacent in the circumferential direction.

[0052] In one embodiment, a target division angle α is predetermined, whereby all division angles m have a value of at least 0.925*α and at most 1.075*α. Thus, the division angles m have a relative size difference of at most 15% with respect to the target division angle α. Alternatively, all division angles at have a value of at most 1.15*min(α). Thus, the division angles a have a relative size difference of at most 15% with respect to a minimum division angle. Alternatively, all division angles at have a value of at least 0.85*max(α). ; ). Therefore, the division angles at have a relative size difference of at most 15% with respect to a maximum division angle.

[0053] According to a further development of the invention, the machining end comprises at least one material selected from the group consisting of polycrystalline diamond (PCD), cubic boron nitride (CBN), and CVD diamond, in particular a material selected from the group consisting of PCD, CBN, and CVD diamond.

[0054] Advantageously, the end of the machining process, and therefore also the cutting edges, have a long service life.

[0055] In the context of this technical teaching, CVD diamond is understood to be a diamond coating which is obtained by means of chemical vapor deposition.

[0056] According to a further development of the invention, it is provided that the machining end has a length in the direction parallel to the imaginary central axis of a maximum of 4 mm.

[0057] Advantageously, the machining end, with a length of no more than 4 mm, consists entirely of PCD.

[0058] In particular, the maximum machining depth of a milling tool corresponds to the length of the cutting end. Furthermore, the maximum machining depth of a drilling tool is not determined by the length of the cutting end, but by the overall length of the drilling tool.

[0059] According to a further development of the invention, the machining end has a diameter of at least 2.5 mm and at most 100 mm. Advantageously, it is possible to form at least two cutting edge profiles at the machining end starting from a diameter of 2.5 mm. Furthermore, it is advantageously possible to form at least one end cutting edge starting from a diameter of 2.5 mm.

[0060] Preferably, the machining end has a diameter of at least 4 mm, in particular at least 6 mm, in particular at least 8 mm, in particular at least 16 mm, in particular at least 19 mm.

[0061] In one embodiment, the tool has a maximum of 12 cutting edge profiles up to a diameter of 16 mm.

[0062] According to a further development of the invention, the tool is a milling tool. Alternatively, the tool is a drilling tool. Alternatively, the tool is a milling-drilling tool. The problem is also solved by creating a tool kit with a tool according to the invention or a tool according to one of the previously described embodiments and a usage note. The usage note specifies a maximum feed per cutting edge. The cutting edge interruptions have a depth greater than the maximum feed per cutting edge. Advantageously, if the feed is selected according to the usage note, it is ensured that the deepest area of ​​the cutting edge interruption, also referred to as the bottom, does not interact with the workpiece and the workpiece is therefore not machined by means of the bottom of the cutting edge interruption.The advantages of the tool kit are particularly evident in the context of the tool itself.

[0063] In particular, the direction in which the depth is measured is orthogonal to the circumferential surface or the end face of the tool at the interruption position. Alternatively, the direction is radial to the central axis of the tool.

[0064] In a preferred embodiment, the application note additionally specifies at least one material to be machined, wherein the at least one material is defined in particular by a pre-splitting speed. Advantageously, this ensures that the desired machining quality is achieved.

[0065] In particular, the at least one material to be processed, as specified in the instructions for use, is a brittle material. Preferably, the at least one material is selected from the group consisting of glass, cemented carbide, monocrystalline silicon, ceramic, and any combination of the aforementioned materials. The cemented carbide preferably contains 6% cobalt.

[0066] In the context of the present technical teaching, the pre-splitting velocity refers to the velocity at which the material splits or deforms in front of the tool, particularly at the cutting edges.

[0067] The problem is also solved by providing a method for designing, preferably for manufacturing, a tool according to the invention or a tool according to one of the previously described embodiments, wherein the cutting edges are machined from solid material or attached to the machining end. The advantages associated with this method are particularly evident in those already explained in connection with the tool and the tool kit.

[0068] In one embodiment, a tool with a diameter of at least 2.5 mm and at most 19 mm, particularly up to at most 8 mm, is manufactured. For this purpose, the machining end, consisting of PCD, is brazed onto a tool shank having the clamping end. Subsequently, the cutting edges and the interruptions in the cutting edges are machined from the machining end by means of a material removal process, in particular by means of lasers. Alternatively, the cutting edges and the interruptions in the cutting edges are machined from the machining end by means of a material removal process, in particular by means of lasers, before the machining end is brazed onto the tool shank.

[0069] In a further embodiment, a tool with a diameter of at least 8 mm is manufactured. For this purpose, a plurality of cutting bodies, each having a cutting edge or on which a cutting edge is formed or is formed, are soldered onto the machining end along the at least one cutting edge path, wherein the cutting bodies and cutting edges are spaced apart from each other according to the cutting edge interruptions.

[0070] Preferably, the ratio of the sum of the cutting edge lengths to the total length is selected depending on the number of cutting edge profiles. Alternatively or additionally, the ratio of the cutting edge interruption length to the cutting edge length is selected depending on the number of cutting edge profiles.

[0071] In particular, the ratio of the sum of the cutting edge lengths to the total length decreases as the number of cutting edge sections increases. Specifically, a first ratio of the sum of the cutting edge lengths to the total length of a first tool with a first number of cutting edge sections is smaller than a second ratio of the sum of the cutting edge lengths to the total length of a second tool with a second number of cutting edge sections if the first number is greater than the second. Alternatively or additionally, the ratio of the cutting edge interruption length to the cutting edge length increases as the number of cutting edge sections increases.In this case, a first ratio of the cutting edge interruption length to the cutting edge length of the first tool with the first number of cutting edge profiles is greater than a second ratio of the cutting edge interruption length to the cutting edge lengths of the second tool with the second number of cutting edge profiles if the first number is greater than the second number.

[0072] The invention will be explained in more detail below with reference to the drawings. The drawings show:

[0073] Figure 1 shows a schematic representation of a first embodiment of a tool,

[0074] Figure 2 shows a schematic representation of a second embodiment of the tool,

[0075] Figure 3 shows a schematic representation of a third embodiment of the tool,

[0076] Figure 4 shows a schematic representation of a fourth embodiment of the tool, and

[0077] Figure 5 shows a schematic representation of a fifth embodiment of the tool.

[0078] Fig. 1 shows a schematic representation of a first embodiment of a tool 1, in particular a milling tool 3, for machining a brittle material.

[0079] The tool 1 has an imaginary central axis 5, a machining end 7, a clamping end 9 opposite the machining end 7, a plurality of cutting edges 11, and preferably a tool shank 6. The plurality of cutting edges 11 extend along a first imaginary cutting edge path 13.1 and a second imaginary cutting edge path 13.2 in the region of the machining end 7. Two cutting edges 11 of the plurality of cutting edges 11 are spaced apart from each other by a cutting edge interruption 15 at an interruption position. Each imaginary cutting edge path 13 has a total length 17. Furthermore, each cutting edge 11 of the plurality of cutting edges 11 has a cutting edge length 19. A ratio of the sum of the cutting edge length 19 to the total length 17 is less than 1 and each cutting edge length 19 is shorter than 1.5 mm.

[0080] The first cutting edge profile 13.1 and the second cutting edge profile 13.2 are straight, preferably linear, and arranged parallel to the imaginary central axis 5. Thus, the cutting edge profiles 13.1 and 13.2 are also arranged parallel to each other.

[0081] Along each cutting edge profile 13.1, 13.2, a plurality of cutting edges 11 are arranged. In particular, along the first cutting edge profile 13.1, a first cutting edge 11.1.1 and a second cutting edge 11.1.2 are arranged and separated from each other by a first cutting edge interruption 15.1 at a first interruption position. Additionally, along the second cutting edge profile 13.2, a first second cutting edge 11.2.1 and a second second cutting edge 11.2.2 are arranged and separated from each other by a second cutting edge interruption 15.2 at a second interruption position.

[0082] In particular, the first interruption position and the second interruption position are both axial interruption positions. Additionally, the first cutting edge interruption 15.1 and the second cutting edge interruption 15.2 are arranged at an identical location with respect to the imaginary central axis 5, such that the first interruption position, in particular a first axial interruption position, and the second interruption position, in particular a second axial interruption position, are identical.

[0083] Furthermore, the first cutting edge 11.1.1 and the first second cutting edge 11.2.1 have a first cutting edge length of 19.1, and the second first cutting edge 11.1.2 and the second second cutting edge 11.2.2 have a second cutting edge length of 19.2. In particular, the first cutting edge interruption 15.1 and the second cutting edge interruption 15.2 have a cutting edge interruption length of 21 along their respective imaginary cutting edge paths 13.1, 13.2.

[0084] In addition, the cutting edge interruptions 15.1 and 15.2 each have a depth 23 which is preferably greater than the maximum feed per cutting edge 11 of the tool 1.

[0085] In particular, the majority of cutting edges 11 in the area of ​​the machining end 7 run on a circumferential surface of the tool 1 from an end face 25 of the tool 1 in the direction of the clamping end 9 along the imaginary cutting edge path 13.

[0086] In particular, the cutting edge profile 13 is straight, preferably linear, and arranged parallel to the imaginary central axis 5.

[0087] Preferably, the machining end 7 comprises at least one material selected from the group consisting of PCD, CBN (cubic boron nitride), and CVD diamond, or consists of a material selected from the group consisting of PCD, CBN, and CVD diamond.

[0088] In particular, the machining end 7 has a length 27 in the direction parallel to the imaginary central axis 5 of at most 4 mm. Furthermore, the machining end 7 has in particular a diameter 29 of at least 2.5 mm and at most 100 mm.

[0089] Fig. 2 shows a schematic representation of a second embodiment of the tool 1, in particular the milling tool 3, for machining a brittle material.

[0090] Identical and functionally equivalent elements are provided with the same reference symbols in all figures, so reference is made to the preceding description.

[0091] The second embodiment differs from the first embodiment shown in Figure 1 in that the first cutting edge interruption 15.1 and the second cutting edge interruption 15.2 are arranged at different interruption positions. Therefore, the first cutting edge 11.1.1 has a first cutting edge length 19.1.1, the second cutting edge 11.1.2 has a second cutting edge length 19.1.2, the first second cutting edge 11.2.1 has a first second cutting edge length 19.2.1, and the second second cutting edge 11.2.2 has a second second cutting edge length 19.2.2.

[0092] Fig. 3 shows a schematic representation of a third embodiment of the tool 1, in particular the milling tool 3, for machining a brittle material.

[0093] The third embodiment differs from the first embodiment shown in Figure 1 and the second embodiment shown in Figure 2 in that the cutting edge profiles 13 are arranged at an angle to the imaginary central axis 5.

[0094] Because the cutting edges 11 are shown in a top view in this illustration, only the first cutting edge path 13.1 is visible and the depth 23 of the cutting edge interruptions 15 is not visible.

[0095] Furthermore, the illustration shows chip surfaces 31 of the cutting edges 11.

[0096] Fig. 4 shows a schematic representation of a fourth embodiment of the tool 1, in particular the milling tool 3, for machining a brittle material.

[0097] The tool 1 has a plurality of imaginary cutting edge profiles 13, 13.1, 13.2. Along each cutting edge profile 13, 13.1, 13.2, a plurality of cutting edges 11 extend. In particular, the tool 1 has a plurality of first cutting edge profiles 13.1 and a plurality of second cutting edge profiles 13.2. The plurality of first cutting edge profiles 13.1 are arranged in a closed first cutting edge profile group 33.1. Furthermore, the plurality of second cutting edge profiles 13.2 are arranged in a closed second cutting edge profile group 33.2. In addition, tool 1 has a closed third cutting edge profile group and a closed fourth cutting edge profile group, which are hidden from the viewer in the illustration or arranged facing away from the viewer on tool 1.

[0098] For clarity, only two cutting edge profiles 13, the associated cutting edges 11 and the associated cutting edge interruptions 15 are provided with reference symbols.

[0099] Along the first cutting edge profile 13.1, the first cutting edge 11.1.1, the second cutting edge 11.1.2, a third cutting edge 11.1.3, a fourth cutting edge 11.1.4, and a fifth cutting edge 11.1.5 are arranged. Each pair of these cutting edges 11.1.1, 11.1.2, 11.1.3, 11.1.4, and 11.1.5 is separated from each other by a cutting edge break 15. A first cutting edge break 15.1.1 is arranged between the first cutting edge 11.1.1 and the second cutting edge 11.1.2. Furthermore, a second first cutting edge interruption 15.1.2 is arranged between the second first cutting edge 11.1.2 and the third first cutting edge 11.1.3. Furthermore, a third first cutting edge interruption 15.1.3 is arranged between the third first cutting edge 11.1.3 and the fourth first cutting edge 11.1.4. Furthermore, a fourth first cutting edge interruption 15.1.4 arranged between the fourth first cutting edge 11.1.4 and the fifth first cutting edge 11.1.5.

[0100] The figure clearly shows that all the first cutting edge profiles 13.1 of the majority of the first cutting edge profiles 13.1 are parallel to each other and skew to the central axis 5. Furthermore, all the first cutting edge interruptions 15.1.1 of the first cutting edge profiles 13.1 are arranged at an identical interruption position. Additionally, all the second cutting edge interruptions 15.1.2 of the first cutting edge profiles 13.1 are arranged at an identical interruption position. The same applies to the third cutting edge interruption 15.1.3 and the fourth cutting edge interruptions 15.1.4. Along the second cutting edge path 13.2 are arranged the first second cutting edge 11.2.1, the second second cutting edge 11.2.2, a third second cutting edge 11.2.3 and a fourth second cutting edge 11.2.4. Two of these cutting edges 11.2.1, 11.2.2, 11.2.3, 11.2.4 are arranged.The four cutting edges are spaced apart by a cutting edge interruption 15. A first second cutting edge interruption 15.2.1 is arranged between the first second cutting edge 11.2.1 and the second second cutting edge 11.2.2. Furthermore, a second second cutting edge interruption 15.2.2 is arranged between the second second cutting edge 11.2.2 and the third second cutting edge 11.2.3. Finally, a third second cutting edge interruption 15.2.3 is arranged between the third second cutting edge 11.2.3 and the fourth second cutting edge 11.2.4.

[0101] In addition, all second cutting edge profiles 13.2 of the majority of second cutting edge profiles 13.2 are aligned parallel to each other and skew to the central axis 5. Furthermore, all first second cutting edge interruptions 15.2.1 of the second cutting edge profiles 13.2 are arranged at an identical interruption position. The same applies to the second second cutting edge interruption 15.2.2 and the third second cutting edge interruptions 15.2.3.

[0102] In particular, the majority of first cutting edge interruptions 15.1.1 are arranged on a circular arc around the central axis 5, which is oriented perpendicular to the central axis 5. Similarly, the majority of second cutting edge interruptions 15.1.2, the majority of third cutting edge interruptions 15.1.3, the majority of fourth cutting edge interruptions 15.1.4, the majority of fifth cutting edge interruptions 15.1.5, the majority of first second cutting edge interruptions 15.2.1, the majority of second second cutting edge interruptions 15.2.2, and the majority of third second cutting edge interruptions 15.2.3 are each arranged on a circular arc around the central axis 5, which is oriented perpendicular to the central axis 5. Preferably, the circular arcs of the cutting edge interruptions within a cutting edge profile group are arranged at different axial positions of the imaginary central axis 5.In addition, each circular arc of a cutting edge profile group is preferably arranged axially offset from each circular arc of an adjacent cutting edge profile group.

[0103] The tool 1 particularly preferably has at least one secondary cutting edge 35, and in particular a plurality of secondary cutting edges 35, on the end face 25 of the machining end 7. In particular, the cutting edge profiles each enclose a pitch angle in pairs, wherein the pitch angles have a relative size difference of at most 15%. Preferably, all pitch angles are identical.

[0104] Fig. 5 shows a schematic representation of a fifth embodiment of the tool 1, in particular the milling tool 3, for machining a brittle material.

[0105] The tool 1 has a plurality of imaginary cutting edge paths 13. Along each cutting edge path 13, a plurality of cutting edges 11 run. For clarity, only one cutting edge path 13, the associated cutting edges 11, and the associated cutting edge interruptions 15 are provided with reference numerals.

[0106] Along the cutting edge path 13, the first cutting edge 11.1, the second cutting edge 11.2, a third cutting edge 11.3, and a fourth cutting edge 11.4 are arranged. Each pair of these cutting edges 11.1, 11.2, 11.3, 11.4 is separated from each other by a cutting edge interruption 15. A first cutting edge interruption 15.1 is arranged between the first cutting edge 11.1 and the second cutting edge 11.2. Furthermore, a second cutting edge interruption 15.2 is arranged between the second cutting edge 11.2 and the third cutting edge 11.3. Finally, a third cutting edge interruption 15.3 is arranged between the third cutting edge 11.3 and the fourth cutting edge 11.4.

[0107] The figure clearly shows that all cutting edge profiles 13 of the majority of cutting edge profiles 13 are parallel to each other and oriented at an angle to the central axis 5. Furthermore, the cutting edge interruptions 15 are arranged in a spiral. In particular, the spiral along which the cutting edge interruptions 15 are arranged is counterclockwise, and the cutting edge profiles 13 are tilted to the left relative to the central axis 5, so that the cutting edge profiles 13 and the cutting edge interruptions 15 are aligned.

Claims

REQUIREMENTS 1. Tool (1, 3) for machining a brittle material, in particular glass, hard metal, monocrystalline silicon, and / or ceramic, with - an imaginary central axis (5), - a processing end (7), - a clamping end (9) opposite the end of the machining (7), and - a plurality of cutting edges (11), wherein - the majority of cutting edges (11) in the area of ​​the machining end (7) run along an imaginary cutting edge path (13), wherein - each pair of cutting edges (11) of the plurality of cutting edges (11) are spaced apart from each other by a cutting edge interruption (15) at an interruption position along the imaginary cutting edge path (13), wherein - the imagined cutting edge path (13) has a total length (17), wherein - each cutting edge (11) of the plurality of cutting edges (11) has a cutting edge length (19), and wherein - a ratio of the sum of the cutting edge lengths (19) to the total length (17) is less than 1 and - each cutting edge length (19) is shorter than 1.5 mm.

2. Tool (1, 3) according to claim 1, wherein the cutting edge profile (13) is straight, helical or spiral.

3. Tool (1, 3) according to one of the preceding claims, wherein the cutting edge profile (13) - parallel, or - skews to the central axis (5).

4. Tool (1, 3) according to one of the preceding claims with a plurality of imaginary cutting edge profiles (13) as the cutting edge profile (13), wherein along each cutting edge profile (13) of the plurality of cutting edge profiles (13) a plurality of cutting edges (11) extend.

5. Tool (1, 3) according to claim 4, wherein at least two cutting edge interruptions (15) assigned to different cutting edge profiles (13) are arranged at an identical interruption position.

6. Tool (1, 3) according to claim 5 comprising a first cutting edge profile group (33.1) and a second cutting edge profile group (33.2) comprising the plurality of cutting edge profiles (13), wherein - the first cutting edge profile group (33.1) has a plurality of first cutting edge profiles (13) which have at least one cutting edge interruption (15) at a first interruption position, wherein - the second cutting edge profile group (33.2) has a plurality of second cutting edge profiles (13) which have at least one cutting edge interruption (15) at a second interruption position, and wherein - the first interruption position and the second interruption position are different from each other.

7. Tool (1, 3) according to claim 4, wherein the cutting edge interruptions (15) of the plurality of cutting edge profiles (13) are formed along an imaginary helix around the imaginary central axis (5).

8. Tool (1, 3) according to one of the preceding claims, wherein the plurality of cutting edges (11) along the imaginary cutting edge path (13) are designed as main cutting edges, and wherein the tool (1, 3) additionally has at least one secondary cutting edge (35).

9. Tool (1, 3) according to one of the preceding claims, wherein the Cutting edge profiles (13) each enclose a division angle in pairs.

10. Tool (1, 3) according to one of the preceding claims, wherein the machining end (7) comprises at least one material selected from the group consisting of polycrystalline diamond (PCD), cubic boron nitride (CBN), and CVD diamond, in particular a material selected from the group consisting of PCD, CBN, and CVD diamond.

11. Tool (1, 3) according to one of the preceding claims, wherein the machining end (7) has a length (27) in the direction parallel to the imaginary central axis (5) of at most 4 mm.

12. Tool (1, 3) according to one of the preceding claims, wherein the machining end (7) has a diameter (29) of at least 2.5 mm and at most 100 mm.

13. Tool (1, 3) according to one of the preceding claims, wherein the tool (1, 3) - a milling tool (3), or - a drilling tool, or - a milling drill tool.

14. Tool kit comprising a tool (1, 3) according to one of the preceding claims and a usage note, wherein the usage note specifies a maximum feed per cutting edge (11), and wherein the cutting edge interruptions (15) have a depth greater than the maximum feed per cutting edge (11).

15. Method for designing, in particular for manufacturing, a tool (1, 3) according to one of the preceding claims, wherein the cutting edges (11) - carved from a solid block, or - to be attached to the processing end (7).

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