Apparatus and method for machining cutting edges

Abstract

An apparatus (1) for edge preparation of cutting tools (5), in particular drills, milling tools or similar tools (5), in particular carbide cutting tools, wherein during relative movement the cutting tool (5) is brought into mechanical contact with a resiliently bonded grinding body (2) provided with abrasive particles, so that the particles of the grinding body (2) influence the cutting tool (5) cutting edge geometry, the grinding body (2) having dimensions substantially adapted to those of the corresponding cutting tool (5) to be processed and housed in an exchangeable holder (4) arranged in the area of ​​the processing device, in particular of a tool grinding machine, and held so as to be machinable by the cutting tool (5) for edge preparation. Furthermore, a corresponding method and a corresponding grinding body (2) are provided.

Description

[Technical field]

[0001] The invention relates to an apparatus and a method for machining an edge according to the preamble of claim 1, a method according to the preamble of claim 16 and a machinable grinding body according to the preamble of claim 26. [Background technology]

[0002] In manufacturing by machining, tools with a long service life and high manufacturing accuracy of the parts are required in order to ensure the production of economical and competitive products for manufacturing companies in different processing operations. In addition to the good wear resistance of the tools, a predictable wear behavior is important to ensure a high reliability of the procedure. With the aim of improving the actual behavior of the machining tools, especially in the field of cemented carbide tools, the so-called edge machining has been established as an essential processing step of the manufacturing procedure. In this document, the fine honing of the tool cutter in particular, which is realized after the grinding process to produce the basic macro geometry of the tool, is called edge machining. Due to the brittle and hard material behavior of cemented carbide, micro defects such as breakouts along the cutting edge are caused by the grinding process. Edge machining makes it possible not only to improve such defects but also to create cutting edge geometries adapted to the specific machining process. In many applications, such a load-matched design of the cutting edge makes it even possible to increase the stability of the cutting edge to such an extent that an increased amount of machining can be selected without spending service time. As a result, the economic efficiency of production can be significantly increased.

[0003] Some of the well-established conventional methods of edge preparation are mainly based on the use of cutters with no defined geometry, such as abrasive blasting, magnetic finishing, drag grinding, flow grinding, etc. In addition to these, further methods are known for edge preparation, such as brushing, electrical discharge machining, laser ablation, and rounding grinding. The above methods share the feature that their realization usually requires special machines or equipment, which often means high investment costs. These investment costs are a major obstacle for small and medium-sized tool manufacturing companies. A further disadvantage of the above methods is the increase, sometimes considerable, of the throughput time in tool production. This is due, on the one hand, to the additional processing time required for the processing. On the other hand, the use of a separate machine usually requires additional handling operations. Strictly speaking, it should be mentioned that in the current prior art, none of the above methods are used for processing reground tools. As there is no opportunity to process the cutting edge in the reground state, these tools usually do not reach the production volume of new tools.

[0004] Each of the above mentioned methods has certain advantages and disadvantages, on the one hand with regard to the application of the method itself, but also with regard to the resulting shape of the cutting edge and the surface of the tool. Due to their high industrial relevance, in the following only abrasive blasting, brushing, drag grinding, in particular grinding using elastically bonded grinding discs, and drill grinding similar to the above mentioned methods will be considered.

[0005] In abrasive blasting, the blasting agent, which includes abrasive and carrier media, is accelerated with enormous kinetic energy through a blast nozzle on the workpiece surface. The abrasive media are classified by particle type, particle size, and particle shape. In this case, the carrier medium is often liquid or air. The most important processes that influence the method are the blast feed rate, the blast pressure, and the blast angle, in addition to the choice of blasting agent. The method allows flexible guidance of the blast nozzle or the tool to be processed, which allows selective processing of individual cutter areas. It is therefore particularly suitable for creating complex cutting edge geometries with very small rounding dimensions, where selective control of material wear is very difficult. Especially when the tool diameter is very small and the cutters are close together, so-called passive blasting can cause undesirable effects on other cutting edges that should not be processed. This has a negative effect on the processing accuracy and / or the reproducibility of the processing results. On the free surface and on the processed surface adjacent to the blasted cutting edge and in contact with the abrasive blast, a characteristic dimple structure is formed, which usually results in an optically matte surface.

[0006] A method that is also well established in the industrial field is brushing. A rotating brush, supplied with an abrasive medium, moves along the cutting edge of the tool, whereby material wear occurs. This method is suitable for efficiently producing relatively large asymmetrical roundings. The process-relevant influencing factors of this method are the cutting speed, the feed rate, the feed motion, the pitch angle of the cutting edge, and the brushing time. The thread diameter, the grain size of the abrasive medium, the bristles type, and the bristles density have a relevant influence on the tool. Due to this large number of influencing factors, the process control is complex and requires precise knowledge of the method and contacts for a precisely targeted implementation. In addition to the process control, the process reliability is adversely affected by the wear of the bristles. With small tool diameters, the production of complex cutter geometries is also limited.

[0007] Drag grinding, a variant of vibration grinding, is also a method widely used in the industrial field. Material wear occurs by guiding the tool to be processed through an abrasive medium that is not fixed and is usually stationary. In this case, the tool movement is mostly rotational. In particular, the rotation speed, the direction of rotation, the insertion depth, the processing time and the selected abrasive medium are involved in the processing result. This method allows the efficient creation of small and large roundings. Furthermore, a significant improvement in the surface quality is obtained. However, there are some disadvantages in its use. The tool is immersed in the abrasive, so the contact area between the abrasive and the tool is large. In all such contact areas, material wear occurs, so selective processing of individual cutter areas is almost impossible. It is also difficult to adjust the forming factor and the step-wise rounding, and especially in the case of shaft tools, in the areas with large diameters, the rotational movement causes significant material wear.

[0008] The edge preparation may be realized by a grinding process. Usually, a single or double bevel is created along the cutting edge. In more recent methods, three or more bevels are created, so that the profile shape of the cutting edge approaches a roundness. Furthermore, the application of elastically bonded grinding discs is well known in the field of tool machining. One of the application fields is the fine honing of chip flutes of machining tools.

[0009] A method for machining the cutting edge of cutting tools, in particular drill or milling tools, in particular carbide cutting tools, is known, as described in DE 10 200 43 33. Following the creation of the desired cutting geometry, the cutting tool is first adjusted and / or oriented with respect to the required workpiece data of the cutting geometry and / or cutting properties. The cutting tool is given a rotational movement and then, while maintaining the rotational movement, is introduced or drilled into the grinding disk. The grinding disk comprises a silicon carbide component, a tungsten carbide component or a diamond component and is elastically bonded with a rubber-containing binder at a position around the grinding disk selected for this purpose and to a depth selected according to the geometry of the cutting edge. In this case, the rotating tool moves into the grinding disk with a predetermined drill path and pitch angle. However, this movement can only be realized on a very limited number of machines, so that the method cannot be considered as a universal machining method. Furthermore, the method does not allow for adjustment of the rounding of the cutting edge beyond the tool diameter. Furthermore, drilling in solid materials always results in a significant rounding of the cutter corners and transverse cutters, for example in the case of helical drills, which requires the grinding bodies to be corrected in a complex manner after extensive use. Another disadvantage of this method is the machining of tools with large protrusions, due to the lack of guidance. This method requires complex programming to determine the position of the bore and the pitch angle between the workpiece (in this case the ground machining tool) and the tool, i.e. the grinding disk to be machined. Furthermore, after the complete circumferential process, the grinding disk needs to be returned to its initial state, a process that has to be performed externally. Furthermore, space is taken up in the grinding disk magazine, which may be required, to mount the grinding disk on the grinding mandrel.

[0010] Although edge preparation has proven to be an effective means of improving the performance and machining quality of cutting tools, it often requires additional machines and equipment. This leads on the one hand to huge investment costs for such equipment and on the other hand to additional workpiece handling costs, which can represent a significant part of machining costs in high-wage countries like Germany. Due to the above mentioned technical and economic aspects, it is possible to deduce the demand for the development of further improved edge preparation methods, which are particularly suitable for use by small and medium-sized manufacturers of machining tools and meet the requirements of particularly low investment and operating costs, simple implementation and short tool machining throughput times. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] German Patent No. 102011054276 Summary of the Invention [Problem to be solved by the invention]

[0012] The object of the present invention is to provide a simple and cost-effective possibility for selectively machining the cutting edges of rotationally symmetric machining tools, in particular those having clamping shafts (shaft tools), with respect to fine geometries, while avoiding additional investments in machine costs for the tool manufacturing enterprise. [Means for solving the problem]

[0013] The solution of the problem according to the invention resides in a device according to the features of claim 1, in combination with the features of the respective preambles of the claims, in a method according to the features of claim 16 and in a grinding body according to the features of claim 26. Further advantageous implementations of the invention will become apparent from the dependent claims.

[0014] The invention on the device is based on a device for edge processing of cutting tools, in particular drills, milling tools or similar tools, in particular carbide cutting tools. During the relative movement, the cutting tool comes into mechanical contact with a resiliently bonded grinding body with abrasive particles, so that the particles of the grinding body influence the cutting tool cutting edge shape. According to the invention, in such a general device, the grinding body is further developed in that its dimensions are substantially adapted to the dimensions of the corresponding cutting tool to be processed and is accommodated in an exchangeable holder arranged in the area of ​​the processing device, in particular the device of a tool grinding machine, and is held so as to be machined by the cutting tool for edge processing. In contrast to the known solutions for edge processing, the dimensions of the grinding body in each case are adapted, for example, to the circumferential dimensions of the respective cutting tool to be processed. As a result, on the one hand, significant savings in the material of the grinding body can be achieved and, on the other hand, the technical implementation of the edge processing is selectively influenced and improved. This requires only that material of the abrasive applied to the grinding body that is actually necessary for performing the edge processing, so that the edge processing process is realized in an economically efficient manner. Furthermore, the repair of large grinding disks, which would otherwise be required between each edge processing step, is not necessary. Furthermore, the dimension-adapted grinding bodies are accommodated in corresponding exchangeable holders, which are arranged, for example, in the working chamber of a tool grinding machine and are held so that they can be machined by the cutting tool for edge processing. On the one hand, the exchangeable holders make it possible to supply the holders with new or different grinding bodies, respectively, independently of the basic processing in the grinding machine, so that the re-feeding of the grinding bodies is essentially decoupled from the actual processing. On the other hand, the dimension-adapted grinding bodies can be accommodated, for example, in the working chamber of the grinding machine and held available for the execution of edge processing, in a particularly space-saving manner and therefore in such a way that they do not interfere substantially with the upstream grinding processing that may occur, for example, in the tool grinding machine. This makes it significantly easier and simpler to carry out edge processing on the same tool grinding machine, ideally with the same clamping configuration, since after the basic grinding of the cutting tool on the tool grinding machine, no or only very little additional equipment is required. For example in tool grinding machines, such additional devices take up very little or no additional space in the working chamber of the tool grinding machine.Thus, it is possible for a small tool grinding device to provide not only basic tool grinding but also edge preparation without the need to invest in expensive additional equipment for tool grinding machines or to purchase additional machines. However, it is of course also possible to apply the device to processing devices other than tool grinding machines, for example general and special machines such as drill presses, lathes, etc., to provide the structure. The cutting tool to be processed can be processed or used on the device or machine, and then edge preparation can be performed near the processing or according to the requirements to ensure the predetermined cutting conditions. The edge preparation device can also be used on any device, in particular any processing device, which allows a relative movement between the cutting tool and the grinding body, on which edge preparation can be performed. The type of processing device should therefore be considered general and not limiting. If the application of the device to a tool grinding machine is considered as an example in this specification, other processing devices or general devices are always suggested and included.

[0015] It is particularly advantageous if the replaceable holder is held in the working chamber of the tool grinding machine and can preferably be inserted into the grinding disk receptacle of the tool grinding machine. The constructional space of the grinding disk receptacle is an area of ​​the grinding disk receptacle that usually has no functional use and is usually arranged in the extension of a clamping cone or similar clamping receptacle in the area surrounded by the disk-shaped grinding disk. This collar, into which the grinding disk is inserted, is usually implemented in solid material and is not used for anything else. Therefore, only this space, which is arranged in the center of the working chamber of the tool grinding machine, is available to form the insertion space of the replaceable holder with the grinding body, in which the grinding body is held so that it can be machined with a cutting tool for edge processing. In such an arrangement of the grinding body, which has a small constructional volume and is adapted to the dimensions of the cutting tool, no additional constructional space is required for edge processing. Edge processing can be carried out in an area of ​​the working chamber of the tool grinding machine that is easily available and does not require a change of movement for the movement of the grinding disk or the cutting tool. However, it is of course also conceivable to arrange grinding bodies with a small construction volume and adapted to the dimensions of the cutting tool at another location in the working chamber of the tool grinding machine. Such a location may be provided, for example, in the working chamber of the tool grinding machine, in particular in the area of ​​the grinding spindle, or at a different location. There may also be a variant implemented as a space-saving pallet system, in which the above-mentioned exchangeable holders together with the grinding bodies are held available in the magazine with the same or different diameters. In this way, contact between the tool to be produced and the grinding bodies for several tools to be ground is made possible. The arrangement realizable as a pallet may be implemented in a circular, square or rectangular shape and, depending on the dimensions, may accommodate a given number of exchangeable holders together with the grinding bodies. It is also conceivable to provide exchangeable holders for movement devices such as the spindles of other processing devices, for example the work spindles of lathes, etc.

[0016] It is also advantageous if the grinding body is implemented in a substantially cylindrical shape. Since the cutting tool to be processed also usually has at least mainly cylindrical dimensions, the cylindrical implementation of the grinding body allows a significant adaptation to the dimensions and shape of the cutting tool to be achieved. As a result, a significant saving in the abrasive material of the grinding body can be achieved with respect to the adaptation of the dimensions of the grinding body to the dimensions of the cutting tool. For this purpose, in a further implementation, the circumferential dimensions of the cylindrical grinding body are substantially adapted to the circumferential dimensions of the cutting tool to be processed, so that in the course of the cutting of the cutting tool, which are usually performed one by one, the grinding body can be continuously and almost completely machined, and therefore there is no need to discard unused residues of abrasive material.

[0017] Moreover, it is an important advantage that the grinding bodies can be easily replaced with new grinding bodies after they have been used up, so that the time required for machining the cutting tool is only slightly increased, and the edge preparation does not unnecessarily increase the time required for manufacturing the cutting tool due to refitting etc. that would otherwise be necessary.

[0018] In a first implementation, the grinding body is easily arranged in an exchangeable holder and is preferably pressed into the holder. For this purpose, a rotationally symmetric grinding body can be manufactured, for example, with very small tolerances that are adapted to the diameter of the cutting tool to be processed, and pressed into the exchangeable holder. As a result of the pressing-in, an easily manufacturable and sufficiently rotationally fixed connection is established between the grinding body and the exchangeable holder, which reliably bears the processing forces during the cutting edge processing.

[0019] In a particularly advantageous embodiment, it is conceivable that the exchangeable holder is realized in such a way that it can be inserted into a preferably central bore in the grinding disc receptacle, preferably in the receiving collar of the grinding disc. This volume, which has been almost unused up to now and is readily available, does not change the working chamber of the tool grinding machine at all or only substantially so, while it can be used in almost all tool grinding machines by a simple modification of the usual grinding disc receptacle in the machine-side tensioning member for the grinding disc. In this embodiment too, it is possible to provide an appropriate insertion space for the exchangeable holder to be inserted into other processing machines, such as the spindle of a lathe or similar processing devices.

[0020] In a further implementation, the replaceable holder may have an external thread that can be screwed into a bore in the grinding disc receptacle that is provided with an internal thread. In this way, the replaceable holder may be quickly fitted and fixed tightly against the bore of the grinding disc receptacle. However, it is also conceivable that the replaceable holder is pressed or inserted into the preferably central bore in the grinding disc receptacle and held there with rotational fixation, for example by means of a plug or clamp.

[0021] In particular for the cutting of long-protruding cutting tools with a large length-to-diameter ratio, guide bushes can be arranged for the grinding body in the region of the exchangeable holder. This allows the long-protruding cutting tools to be processed and handled more accurately and safely when guided by the guide bush than without additional guidance. Such long-protruding cutting tools can be, for example, asymmetric deep-hole drilling tools, deep-hole drills, helical drills, etc. with a large length-to-diameter ratio, which otherwise tend to deviate during processing due to their own length or tend to vibrate during cutting. For this purpose, in a further implementation, the guide bush can be arranged in an extension of the exchangeable holder relative to the exchangeable holder, preferably on the exchangeable holder, in order to guide and support the long-protruding cutting tools in front of the machining region of the grinding body.

[0022] It is also conceivable that the conductor paths and / or sensor elements providing information on the progress of the edge processing can be introduced into the exchangeable holder. For example, it is also possible to monitor the process of processing and, if appropriate, to influence it during the edge processing using touch-free sensors or the like. In a further implementation, it is also conceivable that, with regard to the voltage source, the sensor element comprises an accumulator which is integrated into the exchangeable holder and can be charged in the grinding disc magazine or externally when not in use. This allows the accumulator to store sufficient energy in order to carry out the above-mentioned monitoring process during the edge processing when the respective exchangeable holder is replaced outside production hours when the exchangeable holder is not in use.

[0023] The grinding body is particularly advantageous if it contains abrasive particles, in particular made of silicon carbide, aluminum dioxide or diamond, and is continuously and completely machined by the cutting tool to be processed. The machining behavior of the grinding body and the cutting edge processing that can be achieved thereby can be influenced in a wide range by the selection, i.e. the mixture, of the respective abrasive particles that go into the grinding body, and in a further implementation by mixing fine and / or coarse abrasive particles. It is also conceivable here to implement the distribution of fine and / or coarse abrasive particles non-uniformly in the grinding body, for example in order to induce different processing behaviors in the central and peripheral regions of the grinding body. This allows different processing results in the individual regions of the cutting tool, adapted to the respective shape of the cutting tool to be processed.

[0024] It is also conceivable that the grinding body has an axially extending hole, which is adapted to the diameter of the cutting tool, and in which the cutting tool is not affected by the particles of the grinding body. Thus, for example, in the cutting of a drill, it is advantageous that the area of ​​the transverse cutters of the drill can be not machined at all or can be machined differently from the area of ​​the main cutter. If the material of the grinding body is not present only in the area of ​​the transverse cutters due to the hole, the area of ​​the transverse cutters is not changed.

[0025] Furthermore, it is conceivable that the grinding body comprises parts with different bond hardness, in particular radial annular parts with different hardness. The bond of the abrasive grains of the grinding body has a direct effect on the machining behavior of the grinding body and therefore on the local edge processing of the cutting tool. By changing the hardness or by having areas with different bond hardness, it is possible to achieve a further adaptation of the edge processing result to the requirements of the respective cutting tool. For example, the center of the grinding body may have a higher bond hardness than the peripheral area in order to obtain a regular edge rounding by elastic deformation of the rotationally symmetric grinding body.

[0026] The invention further relates to a method for machining cutting tools, in particular drills, milling tools or similar tools, in particular carbide cutting tools, in which during a relative movement the cutting tool is mechanically contacted with a resiliently bonded grinding body provided with abrasive particles, so that the particles of the grinding body influence the cutting tool edge geometry, in which the grinding body is accommodated in an exchangeable holder, the dimensions of which are substantially adapted to the dimensions of the corresponding cutting tool to be machined, in particular a tool grinding machine, for example in the working chamber of the tool grinding machine or in the area of ​​a different processing device, and the grinding body is machined completely in succession by the cutting tool to be machined. Since important features and advantages of the method directly relate to the device described and illustrated above, the described features and advantages of the device may be referred to as features of the method according to the invention.

[0027] It is particularly advantageous if the edge preparation can be carried out in the same clamping arrangement on the same processing device, for example a tool grinding machine, or on a different processing device immediately after the initial production of the cutting tool geometry or after the cutting tool has been reground. In this way, it is possible, on the one hand, to do without an additional device for separate edge preparation, which would otherwise be necessary, and also to carry out the edge preparation directly on the same clamping arrangement and on the same tool grinding machine or processing device on which the basic shaping of the cutting tool takes place. Furthermore, the edge preparation can also be carried out after regrounding already used cutting tools, so that the advantages of edge preparation can be utilized for these reground cutting tools.

[0028] In machining on a grinding machine, the relative motion of the grinding body and the cutting tool, especially the superposition of the rotation direction and rotation speed, has the advantage that a wide range of adaptation of the cutting speed can be obtained. Since many parameters of the edge preparation are influenced by the cutting speed of the edge preparation, various possible cutting speeds may be selectively used to control the result of the edge preparation.

[0029] It is further conceivable that the grinding body and / or the cutting tool perform a rotational movement during machining of the grinding body. In addition to the normal rotation of the cutting tool, the grinding body can also rotate, if necessary counter-rotate, or rotate at a different rotational speed. This allows, in particular, the rounding and / or inclination of the cutting edge of the cutting tool to be selectively created by superimposing the rotational movements of the grinding body and / or the cutting tool, or the production of asymmetric cutting edge profiles and / or cutting edge profiles that vary over the tool diameter.

[0030] Furthermore, it is conceivable that during edge machining, only the cutting tool being machined performs the necessary translational and rotational movements. Furthermore, it is also conceivable to create a variable rounding over the cutter area of ​​the cutting tool, since the grinding body has parts with different bond hardness. For this purpose, it is possible to selectively manufacture the grinding body with a locally or partially variable bond hardness, so that the grinding body is adapted to the respective cutting tool to be processed and thus influences the local machining and the local cutting edge processing by the cutting tool.

[0031] Furthermore, due to the axially extending holes which are adapted to the diameter of the cutting tool and within which the cutting tool is not affected by the particles of the grinding body, it is also conceivable that the grinding body serves only certain areas of the cutting tool, in particular the main cutter of a drill tool, for example, for edge processing, while other areas, in particular the lateral cutters of a drill tool, are not rounded off.

[0032] The abrasive body may have an outer dimension that matches the diameter of the cutting tool so that only selected areas of the cutter of the cutting tool are subjected to edge preparation. Depending on the cutting tools to be processed, it is conceivable that cutting tools with main and secondary cutters, in particular milling tools, friction tools and / or sequential drilling tools, successively machine corresponding grinding bodies with different properties by means of their main and secondary cutters, in which case, for example, the main cutter of a reamer can be processed with grinding bodies of a different shape or size than the grinding bodies for the secondary cutters, so that in each case optimal machining results can be obtained for the main and secondary cutters respectively.

[0033] The invention further relates to a grinding body for carrying out the method according to claim 16. The cylindrical grinding body has a circumferential dimension substantially adapted to the circumferential dimension of the cutting tool to be machined. [Brief description of the drawings]

[0034] [Figure 1] FIG. 2 shows the basic structure and function of the device according to the invention, placed in the grinding disc receptacle of the grinding disc prior to drill cutting. [Diagram 2] FIG. 2 is a view of the device according to the invention shown in FIG. 1 with an additional guide bush before the cutting edge of the long-projecting deep-hole drill bit. [Figure 3a-3c] 2A and 2B show diagrams and cross-sections of a grinding body implemented in different ways in the device according to the invention of FIG. 1; [Figure 4a-4d] FIG. 2 shows a detailed cross-sectional view of an exchangeable holder with abrasive bodies arranged therein for machining the edges of different cutting tools. [Diagram 5] FIG. 2 shows a pallet-like magazine in an apparatus according to the invention, the pallet-like magazine comprising a number of exchangeable holders and locations for receiving grinding bodies. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] A particularly preferred embodiment of the device according to the invention is shown in the drawings. The drawings are presented for illustrative purposes only. In FIG. 1, in a principle diagram, the basic structure and function of the device 1 according to the invention can be seen. The device 1 is exemplarily arranged in a grinding disk receptacle 3 of a grinding disk 4 before the cutting edge processing of a cutting tool 5, which in this case is implemented as a drill. The device 1 is arranged on a conventional tool holder of the kind normally used in conventional tool grinders, which in this case is implemented as a conical receptacle 19 of a grinding disk 14. The actual implementation of the receptacle on the tool grinder side of the device 1 is not relevant here and may include any kind of mechanical interface to the tool grinder. An arrangement of this kind may also be realized in other processing devices, such as for example drill presses, lathes or other devices of the kind. The illustrated embodiment of the tool grinder is to be understood here only as an example and may be implemented in several variants.

[0036] On a conical receptacle 10 in the working chamber of the tool grinding machine, a receiving collar 3 for receiving a grinding disc 14 is placed, on which the grinding disc 14 is inserted through its hole and then fixed in the usual way by a cap nut 9 via a screw 8. This receiving collar 3 is usually made of a solid material and serves no other purpose than to support the grinding disc 14.

[0037] According to the invention, a part of the receiving collar 3, which is otherwise made of solid material and is located in the center of the working area of ​​the tool grinding machine, is used to accommodate the device 1 according to the invention. For this purpose, a central longitudinal bore 11 is formed in the receiving collar 3 as a blind bore from the working area of ​​the tool grinding machine. Into the longitudinal bore 11 a sleeve-like, easily replaceable holder 4 for a grinding body 2, which will be described in detail below, can be inserted. As a result of this arrangement of the device 1, the device 1 provides a receptacle for a grinding body 2 which can be used for edge processing of a cutting tool 5, but does not interfere with the normal operation of the tool grinding machine.

[0038] The exchangeable holder 4 has an outer diameter that allows it to be inserted substantially without tolerance into the longitudinal bore 11 of the receiving collar 3. The exchangeable holder 4 in the longitudinal bore 11 may be fixed by an end thread 6 on the outer surface of the exchangeable holder 4, which can be screwed into a corresponding counter-thread in the longitudinal bore 11. On the other hand, if the exchangeable holder 4 is easily exchangeable and thus rotationally fixed, the exchangeable holder 4 may be fixed in the longitudinal bore 11 by a press fit or another engagement or press fit.

[0039] The inside of the sleeve-like structured exchangeable holder 4 has a bore 23, into which a cylindrical grinding body 2 can be inserted or pressed in a rotationally fixed manner, which can be used for contacting the cutter 7 of the cutting tool 5 for the cutting of the cutting tool 5. The grinding body 2 is implemented, for example, with an elastically bonded abrasive particle matrix, such as rubber-like bonded abrasive particles formed by a hard material.

[0040] With regard to its cylindrical outer diameter, the grinding body 2 is adapted to the circumferential dimension of the cutting tool 5, in this case the outer diameter of the drill. The outer diameter of the grinding body 2 is slightly larger than the outer diameter of the cutting tool 5 so that during edge processing the cutter of the cutting tool 5 comes into contact in any case only with the grinding body and not with the exchangeable holder 4.

[0041] To perform the edging of the cutting tool 5, for example after the basic grinding of the tool geometry by means of the grinding disk 14, the cutting tool 5, implemented as a drill, is placed in the longitudinal bore 11 of the receiving collar 3 at the front of the device 1, such that the axes of the cutting tool 5, the longitudinal bore 11 and the exchangeable holder 4 are aligned so as to coincide with one another. The cutting tool 5 then machines the grinding body 2 by advancing in the feed direction towards the grinding body 2 during a relative rotation between the cutting tool 5 and the grinding body 2 until the cutter of the cutting tool 5 comes into contact with the grinding body 2 in a specified manner, and is thereby machined. The grinding body 2 is machined at least in the cross-sectional direction and is therefore shortened in the longitudinal direction. Following the edging of the cutting tool 5, the cutting tool 5 is disengaged from the holder 4 by moving again in the opposite direction of the feed direction 24, and is ready for removal.

[0042] The process may be repeated with the next cutting tool 5. As a result, the grinding body 2 is further continuously machined and, when it reaches its service limit, it has to be replaced. For this, the entire replaceable holder 4 including the remainder of the grinding body 2 is removed from the longitudinal bore 11 and replaced with another replaceable holder 4 with a new grinding body 2 pre-fitted. Due to the quick exchangeability of the replaceable holder 4 including the grinding body 2, it is possible to immediately continue the work. Further replaceable holders 4 of the same kind may, for example, be placed in other grinding disc receptacles as a reserve for use if the processing does not change. This allows the replacement of the grinding body 2 to be delayed until the end of the work or until the wear limit of the grinding disc 14 is reached.

[0043] Figure 2 illustrates a modification of the device 1 shown in figure 1. The device 1 is modified for the cutting of long-protruding cutting tools 13, in particular for the cutting of deep-hole drills. As during grinding processes and cutting edge preparation, such long-protruding cutting tools 12 tend to be pushed to the side and start to vibrate. In this case, the cutting tools 13 are therefore guided and supported by guide bushes 12 arranged in front of the exchangeable holder 4, thus avoiding or substantially avoiding the negative effects of the long protrusion.

[0044] 3a to 3c show diagrams and cross-sections of different constructions of the grinding body 2 of the device 1 according to the invention of FIG. 1, which constitute possible modifications of the grinding body 2 by way of example. In FIG. 3 a the grinding body 2 may be of the type shown in FIG. 1, which is carried out uniformly over the entire machined area of ​​the grinding body 2 .

[0045] Fig. 3b shows a grinding body 2 with a central hole 15, which can be used, for example, for the cutting of a drill as cutting tool 5. Since there is no abrasive in the area of ​​the hole 15, the drill does not come into contact with the grinding body 2 in this area. As a result, the cutting tool 5 implemented as a drill is not affected in the area of ​​the sensitive transverse cutters and maintains the shape achieved by the preceding grinding process with the grinding disk 14. Due to the sleeve-like shape of the grinding body 2, the main cutter is only machined in the area of ​​the main cutter.

[0046] As shown in Fig. 3c, the peripheral region 17 and the central region 16 of the grinding body 2 may be formed of different or identical abrasive particles having different bond hardness and therefore different machining properties. For example, the central region 16 of the grinding body 2 may have a higher bond hardness than the peripheral region 17 in order to minimize elastic deformations in the inner cutters of the cutting tool 5. Several modifications of the grinding body 2 are considered here depending on the cutting tool 5 to be processed and its shape.

[0047] Figures 4a to 4d show detailed cross-sectional views of the exchangeable holder 4 and grinding bodies 21, 22 for the edge preparation of different cutting tools 18, 19 and 20 arranged in the exchangeable holder 4. All tools 18, 19 and 20 have together different primary and secondary cutters which are not and cannot be processed in a simple manner or in one run.

[0048] For example, the reamer 18 shown in Fig. 4a can be machined using sub-area 22 of the grinding body 2 for the primary cutter and simultaneously using sub-area 21 of the grinding body 2 for the secondary cutter. However, it is also conceivable to machine the secondary cutter in a separate operation after machining of the primary cutter, using only sub-area 21 of the grinding body 2 for the secondary cutter, as shown in Fig. 4b.

[0049] FIG. 4 c shows, for example, the cutting edge machining of a sequential drill 19 in which two steps are performed simultaneously by means of two sub-areas 21 and 22 which are differently connected in the grinding body 2 .

[0050] FIG. 4 d shows the edge preparation of the milling tool 20 only for the secondary cutter which is in contact with the sub-region 21 of the grinding body 2 . 5 shows a possible implementation of a pallet-like magazine 25 in the device 1 according to the invention with receptacles 26 for receiving a plurality of exchangeable holders 4 and the grinding bodies 2 arranged therein. The exchangeable holders 4 with the grinding bodies 2 may be kept available in such a pallet-like magazine 25 with the same or different diameters. This allows a simple and automatable exchange of the exchangeable holders 4 with the respectively required grinding bodies 2 and thus a quick and automatable contact between the cutting tool 5 to be produced and the grinding bodies 2 suitable for the plurality of tools 5 to be ground. The device exemplarily implemented here as a pallet-like magazine 25 may be realized in a circular, square or rectangular shape and may provide a certain number of receptacles 26 for the exchangeable holders 4 with the grinding bodies 2 depending on the respective dimensions.

[0051] The following is a brief description of the features and advantages of the present invention. The basic idea of ​​the method according to the invention is the use of an elastically bonded grinding body 2 implemented with abrasive particles, which here is exemplarily mounted in a specifically developed grinding disk receptacle 3. In the predetermined machining of such a grinding body 2, the wear of material occurs at the cutting edge of the cutting tool 5, so that it can be used for selective machining. The method is carried out, for example, on a conventional tool grinding machine, so that at the end of the processing sequence of the tool production, it is possible to add for the re-sharpening of each tool without additional handling operations. The wear of material required for machining occurs due to the relative movement between the grinding body 2 and the cutting tool 5. Here, the cylindrical grinding body 2 is clamped in a positionally fixed manner in the grinding disk receptacle 3, while the necessary translational and rotational movements are performed by the cutting tool 5 to be machined, for example.

[0052] Also, due to the deliberate overlap of the rotation directions of the cutting tool 5 and the grinding disk receptacle 3, in this case there is the possibility of selectively adjusting the rounding and inclination of the cutting edge. Furthermore, due to the structure of the grinding bodies 2 with different hardness, it is possible to create a variable rounding over the cutter area of ​​the cutting tool 5. A well-known problem is the rounding of the transverse cutters of the cutting tool 5, which occurs with conventional processing methods. By using a grinding body 2 with a hole 15 adapted to the tool diameter 5, it is possible to adapt, for example, the main cutter of the drill tool 5 to the processing, while avoiding the rounding of the transverse cutters. The same applies with regard to the exact adaptation of the diameter of the grinding body 2 to the diameter of the cutting tool 5 to be processed.

[0053] Furthermore, due to the free process movements there are further fields of application, such as for example the machining of reamers, micro-milling tools and sequential drilling tools. The machining of the grinding body 2 leads to wear of material on the cutting edge of the cutting tool 5, which is therefore rounded. The advantage of the method according to the invention is that the tool manufacturing (grinding of the macro-shapes) and the defined formation of the fine cutting edge shape can be carried out, for example, on the same tool grinding machine or processing device. The machining of the grinding body 2 ensures that fresh abrasive media is always used, which results in constant processing conditions for the duration of the process. The influence on the tool is here limited to the area of ​​the cutting tool 5 in contact with the grinding body 2, which has advantages over other processing methods such as drag grinding or abrasive blasting. In addition to the low investment costs, the processing costs per tool are low, since the replacement of the grinding body 2 can be carried out quickly and easily.

[0054] In the current technology, the rounding of the cutting edges of long-projecting cutting tools 13, especially those with a large length to diameter ratio (l / d ratio), requires special handling and extensive process control if a proper cutting edge machining is to be achieved. The device according to the invention offers the opportunity to machine such long-projecting cutting tools 13 by simple movements and by short processing times within existing manufacturing procedures in a single clamping arrangement of a tool grinder or processing device. However, besides cutting tools 13 with high l / d ratios, also normal rotationally symmetric processing tools can be machined by the method by slight modifications of the grinding body 2.

[0055] In addition to the rounding of the cutting edge of new tools 5, the method according to the invention also allows machining of cutting tools 5 which have been resharpened and therefore already have a hard material layer applied on certain functional surfaces. According to currently available knowledge, this machining cannot be selectively realized with currently available methods, so that the performance of resharpened cutting tools 5 is often significantly lower than that of new cutting tools 5.

[0056] For the implementation of the device 1 according to the invention, it is important, for example, to accommodate the exchangeable holder 4 in the grinding disc receptacle 3. The grinding disc receptacles 3 that are usually used in tool grinding machines have a corresponding interface to the tool grinding machine spindle. These are usually implemented as hollow shaft cones (HSK), shaft cones (SK) or even more often as standardized interfaces to allow high flexibility and precision in the grinding disc exchange. Here, in the case of tool grinding, the grinding discs are usually placed on a mandrel 3 having, for example, a diameter d=20 mm, which are positioned by a distance ring and fixed via a clamping nut 9. The center of the mandrel 3 has not had any function up to now. In the present case, the fitting of the exchangeable holder 4 in the bore 11 with an internal thread provides the mandrel 3 with an additional function, and the grinding disc receptacle 3 significantly expands its availability. Besides the fixing of the exchangeable holder 4, the screwable or otherwise joinable connection may allow the implementation of further functional elements that are not involved in the cutting edge processing. Additionally, corresponding receptacles may be provided on other machining equipment, such as lathes, drilling machines, or other specifically or generally applicable equipment.

[0057] The grinding bodies 2, which have been specially developed for use in edge processing, have an elastic bond of abrasive particles with a hardness that must be set depending on the case of the respective application. The rotationally symmetric grinding bodies 2 contain fine or coarse abrasive particles, for example silicon carbide, aluminum dioxide or diamond, and are continuously and completely machined by the cutting tool 5 to be processed. The rotationally symmetric grinding bodies 2 are here adapted to the diameter of the cutting tool 5 to be processed. The grinding bodies 2 are manufactured with very small tolerances and pressed into an exchangeable holder 4. In this way, rounding of the corners of the exposed cutters of the cutting tool 5 can be avoided or can be significantly suppressed compared to conventional methods. Besides rotationally symmetric base bodies with a given bond hardness, it is possible to create grinding bodies 2 with different hardnesses and thus correspondingly adapted to the application and the diameter to be processed. In this connection, in particular in the cutting tool 5, in order to obtain regular cutting edge rounding by elastic deformation of the rotationally symmetric grinding bodies 2, it is necessary for the center 16 of the grinding body 2 to have a higher hardness than the peripheral area 17.

[0058] Moreover, the processing motions provide additional opportunities for including a wide range of parameters in terms of cutting speeds when machining the grinding body 2, for example by superposition of rotation directions and rotation speeds, independent of the operating capabilities of the workpiece spindle and the tool spindle. Also, the influence of the shape factor K on the cutting edge inclination can be activated and adjusted by the opposite, opposite and same movements of the grinding disk receptacle 3 with the integrated grinding body 2 and the cutting tool 5. By the introduction of holes 15, the introduction of centers 16 with different hardness, abrasive particles and particle sizes, and the flexible shaping of the grinding body 2, the method provides the opportunity to form numerous further variants of the machining tool 5. Moreover, the superposition of the axes of the grinding disk receptacle 3 makes it possible to develop and realize different motions that approximate milling, so that selective machining of different milling tools is possible for the front cutter and / or the circular cutter.

[0059] In addition to the above-mentioned use of the grinding bodies 2 for edge processing, the device 1 can also be expanded by utilizing measuring or sensor technology. The introduction of electrical conductor paths and sensors in the exchangeable holder 4 also allows the implementation of an arrangement of monitoring electronics with an electronic accumulator. The monitoring electronics can be charged with suitable charging technology in the grinding disc magazine or externally when not in use.

[0060] Due to the device 1 being integrated in the grinding disc receptacle 3, only a slightly higher acquisition cost is incurred in comparison with a conventional grinding disc receptacle 3. This also means that due to the integration in the grinding disc receptacle 3, the concept can be applied to almost all tool grinding machines or processing machines. An additional installation investment is therefore necessary for most of the known methods, including the associated maintenance and repair costs and handling of the workpiece after the grinding process. A complete processing on a tool grinder, for example, requires a time during which the tool grinder cannot be used for its intended purpose, but this time is negligible due to the very short processing time of each processing, less than 5 seconds. Due to the intelligent configuration of the grinding disc package on the grinding mandrel and / or by providing the device 1 according to the invention for each grinding disc receptacle 3, tool changes can be avoided. This results in an overall increase in productivity and a significant reduction in production costs.

[0061] The adaptation of the grinding body 2 to the diameter of the cutting tool 5 and the predefined maximum tolerances of the grinding body 2 to be machined results in an almost complete absence of any influence on the corners of the cutter of the cutting tool 5 and on the secondary cutter. Also, the contact area between the cutting tool 5 and the grinding body 2 to be machined is limited by the machining thickness, so there is no influence on the outer circumference of the cutting tool 5. The predefined length of the rotationally symmetrical grinding body 2 in the exchangeable holder 4 allows the proposed concept to process several cutting tools 5 with their diameter and target roundness until the grinding body 2 to be machined is completely used up. By changing the respective exchangeable holder 4 to further grinding disk receptacles 3 containing identical grinding bodies 2, a continuous processing close to the processing procedure is possible. The freedom of movement provided by the mounting of the grinding disk receptacles 3 also offers the possibility of realizing different processing movements on the tool grinder, similar to milling. Thus, the opportunity arises to process the main and secondary cutters of the cutting tool 5 with different cutting edge roundness and shape factors.

[0062] In addition to varying the shape and bond hardness of the grinding body 2, it is possible to create different shapes of cutting edge rounding through adaptation of the engagement conditions by movement. Here, the direction of rotation of the cutting tool 5, the direction of rotation of the grinding body 2, the holding time at the bottom of the bore and the advance per revolution are particularly relevant.

[0063] For long-projecting deep-hole drilling tools 13 with different diameters, a guiding of the tool tip is necessary to enable cutting edge machining without damaging the cutting tool 5. For this purpose, an adaptation of the exchangeable holder 4 is necessary. The guiding of the cutting tool 5 must have dimensions such that the grinding body 2 coincides with the axis of the workpiece and the elastic deflection of the cutting tool 5 is compensated. Here, the complexity of the machining depends on what is required regarding the cutting edge. In the case of application for deep-hole drilling tools, a significantly smaller rounding of the inner cutters must be achieved besides a more extensive rounding of the outer cutters. The technical ideas contained in the present disclosure are described below. (Appendix 1) A device (1) for machining the cutting edge of a cutting tool (5), wherein during a relative movement the cutting tool (5) comes into mechanical contact with a resiliently bonded grinding body (2) provided with abrasive particles, so that the particles of the grinding body (2) affect the cutting edge shape of the cutting tool (5), The grinding body (2) has dimensions substantially adapted to the dimensions of the corresponding cutting tool (5) to be processed, is accommodated in an exchangeable holder (4) arranged in the area of ​​the processing device, and is held so as to be machined by the cutting tool (5) for the cutting edge processing, in an apparatus (1). (Appendix 2) 2. The apparatus (1) according to claim 1, wherein the exchangeable holder (4) is held in a working chamber of a tool grinding machine. (Appendix 3) 2. The device (1) according to claim 1, wherein the grinding body (2) is embodied in an approximately cylindrical shape. (Appendix 4) 4. The apparatus (1) according to claim 3, wherein the cylindrical grinding body (2) has a circumferential dimension substantially adapted to the circumferential dimension of the cutting tool (5) to be machined. (Appendix 5) 2. The device (1) according to claim 1, wherein the grinding body (2) can be easily replaced with a new grinding body (2) after it has been used up. (Appendix 6) 2. The device (1) according to claim 1, wherein the rotationally symmetric grinding body (2) can be manufactured with very small tolerances adapted to the diameter of the cutting tool (5) to be processed and can be pressed into the exchangeable holder (4). (Appendix 7) 2. The apparatus (1) according to claim 1, wherein the replaceable holder (4) is insertable into a bore (11) in the grinding disc receptacle (3). (Appendix 8) 8. The apparatus (1) according to claim 7, wherein the interchangeable holder (4) has an external thread (6) which can be screwed into the bore (11) in the grinding disc receptacle (3) provided with an internal thread or of a different processing device. (Appendix 9) 8. The apparatus (1) according to claim 7, wherein the replaceable holder (4) is press-fittable or insertable into the bore (11) in the grinding disc receptacle (3) and is held therein in a rotationally fixed manner. (Appendix 10) 2. The device (1) according to claim 1, wherein a guide bush (12) is arranged relative to the grinding body (2) in the area of ​​the exchangeable holder (4), via which a long-protruding asymmetric cutting tool (13) having a large length-to-diameter ratio can be guided and machined, the guide bush (12) being arranged relative to the exchangeable holder (4) in front of the machining area of ​​the grinding body (2) so as to guide and support the long-protruding cutting tool (13). (Appendix 11) 2. The device (1) according to claim 1, wherein a sensor element providing information regarding the progress of the edge processing can be introduced into the exchangeable holder (4), the sensor element comprising an accumulator integrated in the exchangeable holder (4) and chargeable within the grinding disc magazine or externally when not in use. (Appendix 12) 2. The apparatus (1) according to claim 1, wherein the grinding body (2) comprises abrasive particles and is continuously and completely machinable by the cutting tool (5) to be processed. (Appendix 13) 13. The apparatus (1) according to claim 12, wherein the grinding body (2) comprises a mixture of fine and coarse abrasive particles, and the distribution of the fine and coarse abrasive particles in the grinding body (2) is carried out non-uniformly. (Appendix 14) 2. The device (1) according to claim 1, wherein the grinding body (2) has an axially extending hole (15) adapted to the diameter of the cutting tool (5), and the cutting tool (5) is not affected by particles of the grinding body (2) within the hole (15). (Appendix 15) 2. The apparatus (1) according to claim 1, wherein the grinding body (2) has portions (21, 22) with different bond hardness. (Appendix 16) A method for machining the cutting edge of a cutting tool (5), the cutting tool (5) being brought into mechanical contact with a resiliently bonded grinding body (2) provided with abrasive particles during a relative movement, the particles of the grinding body (2) influencing the cutting edge geometry of the cutting tool (5), comprising: The grinding bodies (2) are accommodated in exchangeable holders (4) whose dimensions are substantially adapted to the dimensions of the corresponding cutting tools (5) to be machined and which are arranged in the area of ​​a processing device, and the grinding bodies (2) are machined completely successively by the cutting tools (5) to be machined. (Appendix 17) 17. The method according to claim 16, wherein the edge preparation is performed in the same processing device and in the same clamping configuration immediately after initial production of the shape of the cutting tool (5) or after re-sharpening the cutting tool (5). (Appendix 18) 17. The method according to claim 16, wherein during machining of the grinding body a wide range of adaptation of cutting speeds can be obtained by relative movement of the grinding body (2) and the cutting tool (5). (Appendix 19) 19. The method according to claim 18, wherein the grinding body (2) and the cutting tool (5) perform a rotational movement during the machining of the grinding body (2), and a selective rounding of the cutting edge of the cutting tool (5) is obtained by superposition of the rotational movements of the grinding body (2) and the cutting tool (5). (Appendix 20) 19. The method according to claim 18, wherein during the edge preparation, the cutting tool (5) being processed performs the necessary translational and rotational movements. (Appendix 21) 17. The method of claim 16, wherein the grinding body (2) creates a variable radius over the cutting area of ​​the cutting tool (5) by portions having different bond hardness. (Appendix 22) 17. The method according to claim 16, wherein the grinding body (2) does not expose an axial region of the cutting tool (5) to edge processing due to an axially extending hole (15) that is adapted to the diameter of the cutting tool (5) and within which the cutting tool (5) is not affected by the particles of the grinding body (2). (Appendix 23) 17. The method according to claim 16, wherein the grinding body (2) has an outer dimension adapted to a diameter of the cutting tool (5) such that only selected areas of a cutter of the cutting tool (5) are subjected to edge preparation. (Appendix 24) 17. The method according to claim 16, wherein the edge preparation is performed on a new tool (5) or on a cutting tool (5) that has been resharpened and therefore already has a cemented carbide layer applied on a specific functional surface. (Appendix 25) 17. The method according to claim 16, wherein the cutting tool (5) having a main cutter and a secondary cutter successively machines corresponding grinding bodies (2) having different characteristics and arranged one by one by means of its main cutter and secondary cutter. (Appendix 26) A grinding body (2) for carrying out the method according to claim 16, wherein the circumferential dimensions of the cylindrical grinding body (2) are substantially adapted to the circumferential dimensions of the cutting tool (5) to be machined. [Explanation of symbols]

[0064] 1. Apparatus according to the present invention 2 Grinding body 3 Receiving collar / ground disc receptacle 4 Interchangeable holders 5 Cutting tools 6 Replaceable holder screws 7 Cutting tool cutter 8 Clamping Screw 9 Clamping nut 10 Tool Cone 11 Bore in grinding disc receptacle 12 Guide bush 13 Deep hole drill 14 Grinding disc 15 holes 16 High bond hardness at the core 17 Peripheral areas with low bond hardness 18 Friction tools 19 Sequential Drill 20 Milling Tools 21 Surrounding grinding body 22 Grinding body located inside 23 Bore holder 24 Feed direction 25 Pallet magazine 26 Receptacle

Claims

1. A device (1) for machining the cutting edge of a cutting tool (5), in which, during a relative movement, the cutting tool (5) comes into mechanical contact with a resiliently bonded grinding body (2) provided with abrasive particles, so that the particles of the grinding body (2) influence the cutting edge shape of the cutting tool (5), The grinding body (2) is accommodated in an exchangeable holder (4) arranged in the area of ​​the processing device and is held so as to be machined by the cutting tool (5) for the cutting edge processing, the grinding body (2) is implemented in an approximately cylindrical shape, and the outer diameter of the cylindrical grinding body (2) is larger than the outer diameter of the cutting tool (5) to be processed so that, when the grinding body (2) is accommodated in the holder (4), the cutting tool (5) comes into contact with the grinding body (2) but does not come into contact with the holder (4) during the cutting edge processing.

2. 2. The device (1) according to claim 1, wherein the exchangeable holder (4) is held in a working chamber of a tool grinding machine.

3. 2. The device (1) according to claim 1, wherein the grinding body (2) can be easily replaced by a new grinding body (2) after it has been used up.

4. 2. The device (1) according to claim 1, wherein the rotationally symmetrical grinding body (2) can be press-fitted into the exchangeable holder (4).

5. 2. The device (1) according to claim 1, wherein the replaceable holder (4) is insertable into a bore (11) in a grinding disc receptacle (3).

6. 6. The device (1) according to claim 5, wherein the exchangeable holder (4) has an external thread (6) which can be screwed into the bore (11) of the grinding disc receptacle (3) which is provided with an internal thread or has an external thread (6) which can be screwed into the bore (11) of a different processing device.

7. 6. Apparatus (1) according to claim 5, wherein the replaceable holder (4) is pressable or insertable into the bore (11) in the grinding disc receptacle (3) and is held therein with rotational fixity.

8. 2. The device (1) according to claim 1, wherein a guide bush (12) is arranged relative to the grinding body (2) in the region of the exchangeable holder (4), via which a long-protruding cutting tool (13) with a large length-to-diameter ratio can be guided and machined, the guide bush (12) being arranged relative to the exchangeable holder (4) in front of the machining region of the grinding body (2) so as to guide and support the long-protruding cutting tool (13).

9. 2. The device (1) according to claim 1, wherein a sensor element providing information regarding the progress of the edge preparation can be introduced into the exchangeable holder (4), the sensor element comprising an accumulator integrated in the exchangeable holder (4) and chargeable in the grinding disc magazine or externally when not in use.

10. 2. The apparatus (1) according to claim 1, wherein the grinding body (2) comprises abrasive particles and is continuously and completely machinable by the cutting tool (5) to be processed.

11. 11. The apparatus (1) according to claim 10, wherein the grinding body (2) comprises a mixture of fine and coarse abrasive particles, and the distribution of the fine and coarse abrasive particles in the grinding body (2) is carried out non-uniformly.

12. 2. The apparatus (1) according to claim 1, wherein the grinding body (2) has an axially extending hole (15) within which the cutting tool (5) is not affected by particles of the grinding body (2).

13. 2. Apparatus (1) according to claim 1, wherein the grinding body (2) has portions (21, 22) with different bond hardness.

14. A method for machining the cutting edge of a cutting tool (5), the cutting tool (5) being brought into mechanical contact with a resiliently bonded grinding body (2) provided with abrasive particles during a relative movement, the particles of the grinding body (2) influencing the cutting edge geometry of the cutting tool (5), comprising: The grinding bodies (2) are accommodated in exchangeable holders (4) arranged in the area of ​​a processing device, and the grinding bodies (2) are continuously completely machined by the cutting tools (5) to be processed, The grinding body (2) is implemented in a substantially cylindrical shape, and the outer diameter of the cylindrical grinding body (2) is larger than the outer diameter of the cutting tool (5) to be processed, so that, when the grinding body (2) is housed in the holder (4), the cutting tool (5) comes into contact with the grinding body (2) but does not come into contact with the holder (4) during the cutting edge processing.

15. 15. The method according to claim 14, wherein the edge preparation is carried out in the same processing device and in the same clamping configuration immediately after initial production of the cutting tool (5) profile or after re-sharpening the cutting tool (5).

16. 15. The method according to claim 14, wherein in the machining of the grinding body a wide range of adaptation of cutting speeds can be obtained by relative movements of the grinding body (2) and the cutting tool (5).

17. 17. The method according to claim 16, wherein the grinding body (2) and the cutting tool (5) perform a rotational movement during the machining of the grinding body (2), and a selective rounding of the cutting edge of the cutting tool (5) is obtained by superposition of the rotational movements of the grinding body (2) and the cutting tool (5).

18. 17. The method according to claim 16, wherein during the edge machining the cutting tool (5) being machined performs the necessary translational and rotational movements.

19. 15. The method according to claim 14, wherein the grinding body (2) creates a variable roundness over the cutting area of ​​the cutting tool (5) by portions with different bond hardness.

20. The method according to claim 14, wherein the grinding body (2) does not subject an axial region of the cutting tool (5) to edge processing due to an axially extending hole (15) inside which the cutting tool (5) is not affected by the particles of the grinding body (2).

21. 15. The method of claim 14, wherein the grinding body (2) has a dimension of the outer diameter such that only selected areas of a cutter of the cutting tool (5) are subjected to edge preparation.

22. 15. The method according to claim 14, wherein the edge preparation is performed on a new tool (5) or on a cutting tool (5) that has been resharpened and therefore already has a layer of hard metal applied on certain functional surfaces.

23. 15. The method according to claim 14, wherein the cutting tool (5) having main and secondary cutters successively machines corresponding grinding bodies (2) having different characteristics and arranged one by one by means of its main and secondary cutters.

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