METHOD AND PROCESSING DEVICE FOR SHARPENING THE CUTS OF A ROTATIVE CUTTING TOOL

Description

[0001] The present invention relates to a method for sharpening, in particular grinding and / or EDM machining, the cutting edges of a rotary cutting tool by means of a machining device.

[0002] In rotary cutting tools, the cutting edges are arranged along the circumference of the tool at predetermined, though not always regular, angles. Circular saw blades are an example of such cutting tools. During the manufacturing of a rotary cutting tool, it is necessary to sharpen its cutting edges or grind their contours. In addition to sharpening the cutting edges, this process typically also serves to compensate for manufacturing tolerances. Besides sharpening the cutting edges during manufacturing, it is also common practice to maintain or recondition rotary cutting tools after use and the resulting wear. This involves resharpening the cutting edges, thus extending the service life of the rotary cutting tool.

[0003] In rotary cutting tools, the cutting edges can be made of a special material such as hardened steel, diamond, or diamond-coated carbide. To sharpen the different types of cutting edges and achieve specified cutting quality, various cutting processes are used, such as grinding or electrical discharge machining (EDM). Grinding often uses a grinding wheel, while EDM often uses an EDM wire or disc.

[0004] For some time now, industry has been seeking to make machining processes, and especially cutting edge sharpening, particularly efficient. At the same time, a high level of machining quality is desired. This also applies to the sharpening of cutting edges on rotary cutting tools.

[0005] From DE 197 52 140 A1, a method and a corresponding device for sharpening circular saw blades are known. For a sharpening process, the circular saw blade is first connected to a spindle in a rotationally fixed manner. Subsequently, the position of the cutting edge or the angular distance between the cutting edges of the circular saw blade is determined using a probe. Several so-called workstations are provided for the grinding process.

[0006] One of the workstations can be arranged at a fixed angular position relative to a clamped circular saw blade, while the other workstations can be adjusted in their angular position relative to the saw blade. However, designs are also known in which the position of all workstations can be changed. The use of multiple workstations is intended to reduce the processing time of a circular saw blade. However, increased machine complexity generally also entails higher acquisition and maintenance costs. Furthermore, a complex control system is necessary to control the numerous workstations simultaneously.

[0007] US patent 6 379 218 B1 discloses the detection of the position of an outer tooth tip of a saw blade, which is intended to be used for the automated processing of saw blades of different dimensions.

[0008] From FR 2 774 614 A3 it is known to determine a cutting angle of a tooth of a saw blade by determining two points of the associated surface.

[0009] From US 4 819 515 A it is known to sharpen the flanks of a cutting edge of a saw blade, whereby the front and rear flanks of the cutting edge are measured.

[0010] The object of the present invention is to provide a method for sharpening the cutting edges of a rotary cutting tool, which, compared to the prior art, enables a reduced cycle time for the rotary cutting tool being processed. Furthermore, this method should enable a sufficiently high level of processing quality. It is also advantageous if the method allows the use of a processing device with a simple design.

[0011] The problem according to the invention is solved by the method according to claim 1. The problem according to the invention is further solved by the processing device according to claim 12. Advantageous embodiments of the invention are described in the dependent claims.

[0012] The invention relates to a method for sharpening the cutting edges of a rotary cutting tool using a machining device. The machining device comprises: a clamping device rotatable about a rotary axis for clamping the cutting tool, a measuring device for measuring the angular positions of the cutting edges of the cutting tool in relation to the rotary axis, and a machining tool.

[0013] The method according to the invention further comprises the following steps: a) Clamping the cutting tool using the clamping device; b) Measuring the angular position of a cutting edge of the cutting tool to be machined using the measuring device as the actual position of the cutting edge to be machined; c) Determining a deviation of the actual position from a target position of the cutting edge to be machined; e) Correcting a relative starting position of the machining tool relative to the cutting edge to be machined, based on the determined deviation, into a corrected relative starting position by linearly moving the machining tool and / or the cutting tool on the machining device; f) Sharpening operation, in particular grinding operation and / or EDM operation, of the cutting edge using the machining tool starting from the corrected relative starting position.

[0014] The correction method according to the invention makes it possible to at least partially or completely compensate for a specific deviation of the actual position from the target position of the cutting edge being machined. A particularly advantageous aspect is the correction achieved by a linear relative displacement between the cutting edge being machined and the machining tool, which can be carried out simply, quickly, and precisely. The masses to be moved are minimal.

[0015] Furthermore, the corrected relative starting position facilitates subsequent sharpening operations. For example, a sharpening program running during the sharpening process does not need to be extensively modified. A predefined sequence of the sharpening program can be retained unchanged. The sharpening program can be executed starting from the corrected relative starting position, for example, from a corrected relative starting point.

[0016] The method according to the invention makes it possible to completely correct or compensate for the deviation. The inventors have further recognized that with only partial compensation of the deviation, the remaining angular error, which can result from a purely linear relative displacement between the cutting edge being machined and the machining tool without any additional change in the relative angular position between the cutting edge being machined and the machining tool, can be disregarded, thus enabling faster machining while maintaining sufficiently high machining quality. Either the angular error can be compensated for by the sharpening process, or it has virtually no impact on the quality of the machined cutting edge, as it is minimal.

[0017] Furthermore, the inventors recognized that the positioning accuracy of the clamping device and the resulting deviation, even if the cutting edge is moved into a machining position after measurement, do not ultimately determine the machining accuracy. This deviation can be efficiently counteracted by the correction method according to the invention.

[0018] According to one aspect of the invention, the linear displacement in step e) can be limited to the linear displacement of the machining tool. This represents a simple, precise, and fast correction. Furthermore, this also simplifies the machine design, as no displacement of the workpiece is required.

[0019] Furthermore, the correction according to the invention can thus be carried out particularly quickly and easily. This limitation to the linear displacement of the machining tool can be made dependent on a limit value. If the deviation is below a predetermined limit value, the limitation applies. If the deviation is above the limit value, the correction is not limited to the linear displacement of the machining tool. A permissible machining tolerance for the cutting edge being machined could, for example, serve as the limit value.

[0020] Furthermore, it may be stipulated that no additional compensation or correction of the deviation is required during the linear displacement in step e) and / or in the other process steps. This allows the entire process to be very simple and, when performed on the machining fixture, fast. A rotary corrective displacement of the machining tool and the associated time loss can thus be avoided.

[0021] If the correction in step e) includes not only the linear repositioning of the machining tool but also a linear repositioning of the cutting tool, this can lead to additional time savings. The respective linear repositioning of the two components relative to each other can be performed simultaneously. Furthermore, this can help to better correct or compensate for the deviation. It is possible to have the respective linear repositioning occur in different spatial directions relative to each other.

[0022] According to an advantageous aspect of the invention, the sharpening process can comprise a linear relative displacement between the processing tool and the cutting edge to be processed in at least one spatial direction, preferably two spatial directions, and particularly preferably three spatial directions. This makes the sharpening process easy to perform and simple to control via the processing device. Furthermore, a linear displacement enables high processing quality and is easier to implement. The displacement in the respective spatial directions can be provided by corresponding slide directions of a slide arrangement of the processing tool. In this case, for example, a rotational relative displacement with respect to the cutting edge to be processed is omitted, which simplifies the sharpening process and simultaneously enables high processing quality.

[0023] Preferably, according to one aspect of the invention, the relative displacement during the sharpening process takes place in at least one of the spatial directions of the linear displacement of step e). This makes it possible to keep the method and the design of the processing device simple.

[0024] According to a further development of the invention, the sharpening process comprises a predetermined movement pattern of the processing tool relative to the cutting edge being sharpened. A predetermined movement pattern enables a simple and reproducible sharpening process. Preferably, the movement pattern is a linear movement pattern, i.e., a purely linear path of motion. Thus, the sharpening process can be kept simple on any cutting edge being sharpened. The term "movement pattern" is to be understood independently of any possible (rotational) movement of the processing tool that is necessary to effect material removal from the cutting edge. If the processing tool is a grinding wheel, the movement pattern does not include the rotational movement of the grinding wheel about its axis of rotation, but rather the grinding stroke that is executed with the grinding wheel.

[0025] According to one embodiment of the invention, the cutting tool mounted on the clamping device assumes a constant angle to the axis of rotation during the sharpening process. According to another embodiment of the invention, the processing tool maintains a constant angle with respect to the cutting edge being processed, a contour of the cutting edge being produced, or a partial contour being produced during the sharpening process. The angle of the processing tool can be changed between partial contours being produced.

[0026] According to an advantageous aspect of the invention, the target position can be a predetermined value. This predetermined value can, for example, be derived from existing data on the cutting tool, such as a data sheet, a marking on the cutting tool, or related manufacturer's specifications. Existing data can also be derived from previous measurements of the same or a comparable cutting tool. Furthermore, the predetermined value can include operator input or be stored in a machine.

[0027] Alternatively, according to the invention, the target position can be the measured angular position of a predetermined cutting edge of the cutting tool. This makes it possible to determine the angular positions of some or all cutting edges of the cutting tool and define one of them as the target position. According to a preferred embodiment, the target position is the angular position of a first cutting edge to be machined. This can coincide with the cutting edge that is measured first in step b). Overall, this allows a target position to be defined in a simple manner. For circular saw blades with unequal pitch, several measurements may need to be carried out, or other methods for determining the target position may be used.

[0028] According to one aspect of the invention, the sharpening process is preceded by step d) of positioning the cutting edge to be machined in a machining position by rotating the clamping device. This is particularly advantageous when the machining tool is arranged at a different circumferential position relative to the cutting tool than the measuring device. The cutting edge to be machined is then rotated from a measuring position to a machining position. Rotating the clamping device with the cutting tool can be implemented in a time-efficient manner.

[0029] According to a further development of the inventive method, it can be provided that in step d) of the positioning process, the deviation is at least partially compensated. This reduces the extent to which correction is necessary in step e). Compensation in step d) preferably occurs when the deviation exceeds a predetermined limit. This makes it possible to at least partially compensate for comparatively large deviations by rotating the clamping device and simultaneously achieve rapid positioning. The target position of the cutting edge does not need to be reached exactly, since the position of the cutting edge is known at all times through the measuring system of the clamping device and the previously performed measurement of the cutting edge's angular position, and the position of the machining tool can be corrected for machining.The correction in step e), for example using linear actuators, ensures a precise and, above all, rapid (partial) correction of the remaining deviation. Consequently, a complex correction of the angular position of the machining tool can be avoided. A predefined value, such as a permissible angular tolerance of the cutting edge being machined or a value representing the positioning accuracy of the clamping device with respect to the axis of rotation, can serve as the limit value.

[0030] According to a further embodiment of the method according to the invention, the at least partial compensation of the deviation by rotating the clamping device takes place in conjunction with the correction in step e). In other words, the correction in step e) can be dependent on the compensation in step d), or vice versa. Thus, the extent of the correction in step e) can be less if compensation has already taken place in step d).

[0031] Alternatively, it may be provided that step d) is performed before or after step e).

[0032] According to a further development of the invention, it can be provided that step b) is repeated until the angular positions of all cutting edges of the cutting tool to be machined have been measured.

[0033] Furthermore, according to one aspect of the invention, it may be provided that steps c) to f) are repeated until all cutting edges of the cutting tool to be processed have been sharpened.

[0034] Alternatively, steps b) to f) can be repeated until all cutting edges of the cutting tool have been sharpened. This can be all cutting edges of the cutting tool or only a subset of them.

[0035] According to a further development of the invention, step b) may include a sub-step b1) of aligning the cutting edge to be machined relative to the measuring device. The measurement in step b) then takes place after the alignment, for example in a sub-step b2) or b3).

[0036] According to a further development of the invention, the sharpening process can include grinding and / or electrical discharge machining (EDM). In particular, the grinding can be carried out using a grinding wheel. Furthermore, the EDM can be carried out using an EDM wire or an EDM disc. Alternatively, machining processes such as milling or laser machining are also conceivable.

[0037] By modifying the process, a cutting tool with a uniform tooth pitch can be produced. For this, the angular position of one cutting edge is measured, and the other cutting edges are machined with the same or a predetermined pitch or spacing. It can be stipulated that at least step f) is repeated until all cutting edges to be machined have been sharpened. Depending on the positions of the unmachined cutting edges, the material removal per cutting edge due to the sharpening process can vary. It is important to ensure that material is removed from every cutting edge being machined.

[0038] The invention further relates to a machining device for sharpening the cutting edges of a rotary cutting tool, wherein the machining device comprises: a clamping device rotatable about a rotary axis for clamping the cutting tool, a measuring device for measuring the angular positions of the cutting edges of the cutting tool in relation to the rotary axis, and a machining tool; characterized in that the processing device is set up to carry out a process of the type described above.

[0039] According to further training, the measuring device may include a tactile or non-contact sensor.

[0040] According to one aspect of the invention, the machining device can comprise a slide arrangement on which the machining tool is arranged, wherein the slide arrangement provides linear displacement of the machining tool in at least a first and / or a second and / or a third longitudinal axis of the slide, hereinafter referred to as the slide direction. The slide directions can be orthogonally aligned with each other. Thus, correction can be carried out easily by means of the slide arrangement.

[0041] According to a further development, it can be provided that the slide arrangement includes a first direct drive for moving the machining tool in the first slide direction and / or a second direct drive for moving the machining tool in the second slide direction and / or a third direct drive for moving the machining tool in the third slide direction.

[0042] According to a further development of the invention, the cutting tool can be designed to be rotationally symmetrical and / or the cutting edges on the cutting tool can be arranged according to a predetermined pattern and / or predetermined tooth spacing. As already mentioned, it is also possible to machine cutting tools with unequal spacing, i.e., with cutting edges unevenly distributed along the circumference.

[0043] According to one embodiment of the invention, it can be provided that the clamping device is linearly displaceable in at least one, preferably two, particularly preferably three spatial directions, for example on a slide arrangement.

[0044] It should be noted that sharpening processes can also include contour grinding. During contour grinding, the clamping device can be driven continuously or discontinuously around the axis of rotation. In contour grinding, the machining position can be defined independently of the angular position of the cutting tool relative to the axis of rotation. In this case, it can be defined, for example, by the position of the axis of rotation or the clamping device in space, or relative to other components of the machining setup.

[0045] Sharpening is not limited to machining processes that necessarily result in a final sharpening of the cutting edge. It can also include related or associated machining steps. The crucial factor is that material is removed from the cutting edge or an area adjacent to it. This can be achieved, for example, through grinding and / or electrical discharge machining (EDM). Furthermore, sharpening can combine various material removal processes. Sharpening can also involve the creation of a cutting edge, for example, from a blank, as is necessary for the initial machining of a new cutting tool.

[0046] It should be noted generally that features, embodiments, or advantages of the invention explained in connection with the method also apply to the processing device used to carry out the method described above. Features of the method can thus be implemented by the processing device and, in particular, embodied in device features, without these device features needing to be explicitly mentioned. The same applies conversely to features of the processing device that also apply to the method.

[0047] The invention is further explained below with reference to the accompanying drawings. These depict: Fig. 1 is a schematic representation of the machining device according to the invention; and Fig. 2 is a schematic representation of the method according to the invention;

[0048] Figure 1Figure 1 shows a schematic representation of a machining device 10 according to the invention, which has a clamping device rotatable about a rotary axis A (not shown in detail). The machining device 10 also includes a measuring device 12 and a machining unit 14.

[0049] The machining unit 14 comprises a machining tool 15, which is arranged on a slide assembly of the machining unit 14 (not shown in detail). The slide assembly includes a first linear slide, which allows linear displacement of the machining tool 15 along a first slide direction X1, and a second linear slide, which allows linear displacement of the machining tool 15 along a second slide direction Z1. The slide assembly can optionally also allow linear displacement of the machining tool 15 along a third slide direction Y1. The machining unit 14 further comprises a rotatable spindle, by which the machining tool 15 can be rotated on the slide assembly about a spindle axis S, which in this case coincides with the first slide direction X1. The machining tool 15, or rather theThe first slide direction X1 and the second slide direction Z1 are arranged at an angle to a horizontal axis. For this purpose, the machining unit 14 has a tilt adjustment mechanism (not shown). The tilt adjustment mechanism can support the slide arrangement, or vice versa. In this case, the spindle axis S and the first slide direction X1 are not aligned orthogonally to a horizontal axis, but at an angle of approximately 13 degrees. This angle is merely an example. The angle could be a predetermined value to which a cutting edge is to be ground.

[0050] A cutting tool 16 in the form of a circular saw blade is arranged and firmly clamped on the clamping device. The cutting tool 16 has a plurality of teeth 18 with a predetermined, constant tooth spacing, with a cutting edge 20 to be machined being fixed to each tooth 18. The cutting edges 20 are made of a particularly hard material such as hardened steel, cemented carbide, polycrystalline diamond (PCD), or diamond-coated cemented carbide.

[0051] The clamping device is designed to clamp or release the cutting tool securely. A controllable clamping mechanism may be provided for this purpose. The clamping device has a rotary drive 22, which is configured to rotate the clamping device about the axis of rotation A. In this case, the axis of rotation A is orthogonal to the plane of the image. Furthermore, the rotary drive 22 is configured to lock the clamping device from rotating about the axis of rotation A. When clamped on the clamping device, the cutting tool 16 is fixedly arranged relative to and on the clamping device. The rotary drive 22 is configured to detect the angular position of the clamping device about the axis of rotation A or to output it as a coded value.The clamping device can be designed as a clamping unit that additionally includes a clamping slide arrangement, which allows the rotary drive to be linearly displaced relative to the rest of the machining device 10 or the machining unit 14 in at least a first clamping slide direction X3 and / or a second clamping slide direction Z3. Preferably, at least one of the clamping slide directions is arranged orthogonally to the axis of rotation A. The rotary drive 22 is shown schematically next to the axis of rotation A, but can also be arranged on the axis of rotation A.

[0052] The measuring device 12 is mounted on a linear drive (not shown) which allows the measuring device 12 to be moved relative to the clamping device in a drive direction X2 orthogonal to the axis of rotation A. The measuring device 12 has a tactile, i.e., touch-sensitive, sensor 24. The sensor 24 is configured to make contact with one of the cutting edges 20 to be machined. As soon as contact is detected, the angular position, i.e., the rotational position of the clamping device about the axis of rotation A, is measured or recorded by means of the rotary drive 22 and stored as the actual position of the cutting edge 20 to be machined in a memory 28 via a controller 26. For this purpose, the controller 26 is connected to all controllable or signal-emitting components of the machining device 10, including the measuring device 12, the rotary drive 22, and the memory 28, via signal lines such as a bus system.

[0053] Figure 2Figure 1 shows a schematic representation of the method 100 according to the invention. The method 100 comprises several successive steps a) to f).

[0054] In step a), the cutting tool 16 is clamped onto the clamping device. This can be done manually or automatically. The clamping device may have a marking indicating how the cutting tool 16 should be clamped. Additionally or alternatively, the clamping device may be equipped with a holder that allows the cutting tool 16 to be clamped only in a predetermined position on the clamping device.

[0055] Step b) then follows, in which the angular position of one of the cutting edges 20 to be machined is measured using the measuring device 12 as the actual position of this cutting edge 20. The angular position describes a measured value relative to the axis of rotation A. The actual position can be stored in the memory 28 for the cutting edge 20 to be machined. To measure the angular position, the cutting edge 20 to be machined is first aligned relative to the measuring device 12, for example in sub-step b1). For this purpose, the measuring device 12 is moved in the direction of the drive direction X2. Furthermore, in another sub-step b2), the clamping device is rotated about the axis of rotation A. As soon as the measuring device 12 outputs a signal, after which the sensor 24 contacts or detects the cutting edge to be machined, the actual position of the cutting edge 20 to be machined is measured. This measurement can also be referred to as sub-step b3).After each measurement process or at the end of step d), the measuring device 12 can be removed from the cutting edge 20 to be machined in the drive direction X2, so that the sensor 24 can no longer engage with the cutting edge 20 to be machined.

[0056] For a cutting edge 20 to be machined, the measurement can be repeated for one or more points on the cutting edge 20 in order to capture a profile or inclination of the cutting edge 20 on the cutting tool 16. In this way, the profile or inclination can be measured as the actual position, either additionally or instead.

[0057] Step b) is repeated sequentially or by performing steps b) to f) until an angular position has been measured for all cutting edges to be processed, or until all cutting edges 20 have been sharpened. This offers particular advantages when using an optical sensor such as a laser light barrier. The cutting tool 16 is rotated once. Alternatively or additionally, after measuring a cutting edge at one diameter, it can be measured at at least one other diameter to determine, for example, the rake angle of the cutting edge.

[0058] In step c), a deviation of the actual position from a target position of the one cutting edge 20 to be machined, or for all cutting edges 20 to be machined, is determined. The target position is a predefined value that is known for the cutting tool 16 for each individual cutting edge 20, has been predefined, or results from a target position of one cutting edge for the other cutting edges.

[0059] In the optional step d), the respective cutting edge 20 to be machined is positioned in a machining position. For this purpose, the cutting tool 16 is rotated around the axis of rotation A until the cutting edge 20, for which the deviation was determined, reaches a predetermined rotational position. In the machining position, the machining tool 15 can engage the cutting edge 20 to enable sharpening. In other words, the cutting edge 20 is pivoted into the machining position after measurement, unless the measurement is performed in the machining position. The machining position is a predetermined angle of rotation, the extension of which the machining tool 15 is located.It is not essential that the cutting edge 20 reaches the exact machining position, because after positioning, the approached machining position is known based on the measured actual position, and the machining tool 15 can be moved in the direction of the approached machining position by moving the X1 and / or Z1 axes. This is a decisive advantage compared to previous machines, which, for example, include a feed mechanism. With these, the current position of the cutting edge is unknown, and it is assumed that it is in the position to which the feed mechanism has positioned it. However, this can be inaccurate due to inertia, especially at excessively high feed rates, or due to friction in the clamping or deformation during clamping.

[0060] Step d) is therefore optional, since the machining unit 14 can also be arranged together with the measuring device 12. In that case, the machining tool 15 can engage with the cutting edge 20 to be machined instead of the sensor 24.

[0061] The rotary drive in step d) can depend on the angle at which the machining tool 15 is inclined.

[0062] If the deviation determined in step c) exceeds a predetermined limit value, which results, for example, from the positioning accuracy of the clamping device about the axis of rotation A, the deviation is at least partially compensated in step d) by increasing or decreasing the rotational movement about the axis of rotation A. The positioning can thus be adjusted. The degree of rotational drive can be increased or decreased such that the cutting edge in the machining position achieves a deviation below the limit value. The degree of correction is adjusted as necessary, depending on step d). This makes it possible to apply the inventive method 100 even with large deviations and still achieve high machining accuracy. The angular position of the machining tool 15 does not need to be changed, at least not during the machining of a particular cutting tool 16.This reduces the processing effort and shortens the throughput time of the sharpening process for the entire cutting tool 16.

[0063] In step e), the relative starting position of the machining tool 15 relative to the cutting edge 20 to be machined is corrected to a corrected relative starting position by linear displacement, based on the determined deviation. For this purpose, the machining tool 15 is linearly displaced using the slide arrangement. Depending on the deviation, the machining tool 15 can be displaced, for example, in the first slide direction X1 or in the second slide direction X2. Furthermore, the cutting tool 16 can be displaced by means of the mounting slide arrangement in one of its slide directions, for example, in the first mounting slide direction X3 and / or the second mounting slide direction Z3. This is done depending on the determined deviation and, if applicable, also depending on the angle or inclination of the machining tool 15.

[0064] In step f), the cutting edge 20 to be machined is sharpened using the machining tool 15, starting from the corrected initial position. This can be a grinding operation or an EDM operation, depending on the design of the machining tool 15. In this case, the grinding operation is performed according to a predefined movement pattern of the machining tool 15, which is generated by the slide arrangement of the machining unit 14. Furthermore, the machining tool 15 is driven to rotate about the spindle axis S. The predefined movement pattern includes at least one movement of the machining tool 15 along the second slide direction Z1. Additionally, the movement pattern can also include a movement of the machining tool 15 in the first slide direction X1 and / or a third slide direction Y1. The slide directions X1, Z1, and Y1 are orthogonal to each other.The movement pattern can include a meandering shape, a spiral shape and / or a one-dimensional movement pattern.

[0065] It may also be provided that the correction step does not completely compensate for, or cannot compensate for, the deviation. Thus, an angular error may occur, for example, in the rake face of the cutting edge being machined. However, this error is extremely small due to the method according to the invention, or can be disregarded, in favor of a simple and fast process.

Claims

1. A method (100) for machining, in particular sharpening, cutting edges (20) of a rotary cutting tool (16), using a machining device (10), the machining device (10) comprising: - a control device (26), - a clamping device that can be rotatably driven about an axis of rotation (A) for clamping the cutting tool (16), - a measuring device (12) for measuring the angular positions of the cutting edges (20) of the cutting tool (16) in relation to the axis of rotation (A), and - a machining tool (15); characterized by the steps of: a) Clamping the cutting tool (16) using the clamping device, b) Measuring the angular position of a cutting edge (20) of the cutting tool (16) to be machined using the measuring device (12) as the actual position of the cutting edge (20) to be machined; c) Determining a deviation of the actual position from a target position of the cutting edge (20) to be machined; e) Correcting a relative initial position of the machining tool (15) relative to the cutting edge (20) to be machined based on the determined deviation to a corrected relative initial position through linear displacement of the machining tool (15) and / or the cutting tool (16) on the machining device (10); f) Sharpening the cutting edge (20) to be machined using the machining tool (15), starting at the corrected relative initial position.

2. The method (100) of claim 1, characterized in that correcting in step e) comprises an exclusively linear displacement of the machining tool (15).

3. The method (100) of claim 1 or 2, characterized in that the sharpening step comprises a linear relative displacement between the machining tool (15) and the cutting edge (20) to be machined in at least one spatial direction, preferably two spatial directions, particularly preferably three spatial directions.

4. The method (100) of any one of the preceding claims, characterized in that the sharpening step comprises a predefined, in particular linear motion pattern of the machining tool (15) relative to the cutting edge (20) to be machined.

5. The method (100) of any one of the preceding claims, characterized in that the target position is a predefined value.

6. The method (100) of any one of the preceding claims, characterized in that step b) is repeated until the angular positions of all the cutting edges (20) of the cutting tool (16) to be machined have been measured.

7. The method (100) of any one of the preceding claims, characterized in that steps c) to f) are repeated until all the cutting edges (20) of the cutting tool (16) to be machined have been sharpened.

8. The method (100) of any one of claims 1 to 5, characterized in that steps b) to f) are repeated until all the cutting edges (20) of the cutting tool (16) to be machined have been sharpened.

9. The method (100) of any one of the preceding claims, characterized in that sharpening is preceded by a step d) of positioning the cutting edge (20) to be machined in a machining position by driving the clamping device in a rotational manner, wherein the deviation is at least partially compensated for in positioning step d).

10. The method (100) of any one of the preceding claims, characterized in that sharpening comprises grinding and / or eroding.

11. The method (100) of any one of the preceding claims, characterized in that at least step f), preferably steps e) and f) are repeated for at least one, preferably all further cutting edges (20) to be machined, wherein the further cutting edges (20) are sharpened taking into account a predefined distance or a predefined angle of the cutting edges (20) relative to each other.

12. A machining device (10) for sharpening cutting edges (20) of a rotary cutting tool (16), comprising: - a clamping device that can be rotatably driven about an axis of rotation (A) for clamping the cutting tool (16), - a measuring device (12) for measuring the angular positions of the cutting edges (20) of the cutting tool (16) in relation to the axis of rotation (A), the measuring device (12) comprising, in particular, a tactile or non-touch sensor (24), and - a machining tool (15); characterized in that the machining device (10) is configured to perform a method (100) of any one of claims 1 to 11, using a control device (26).

13. The machining device (10) of claim 12, further comprising a slide assembly on which the machining tool is arranged, the slide assembly enabling linear displacement of the machining tool in at least a first and / or a second and / or a third slide longitudinal axis, wherein the slide directions are optionally orthogonal to each other.

14. The machining device (10) of any one of claims 12 or 13, characterized in that the slide assembly comprises a first direct drive for displacing the machining tool in the first slide direction and / or a second direct drive for displacing the machining tool in the second slide direction and / or a third direct drive for displacing the machining tool in the third slide direction.

15. The machining device (10) of any one of claims 12 to 14, characterized in that the clamping device is arranged to be linearly displaceable in at least one, preferably two, particularly preferably three spatial directions, e.g. on a slide assembly.