Method for the continuous generating grinding of gears, and profiling method

Abstract

The invention relates to a method for a hard-fine machining of teeth on workpieces using geometrically undefined cutters by means of a continuous generating grinding process in which a grinding worm, in particular a multi-thread grinding worm, with bonded abrasive grains made of CBN or diamond in particular is brought into machining engagement with a toothing at a machining location and is reprofiled after machining one or more workpieces of a workpiece batch, thereby undergoing material abrasion and thus reducing the average pitch diameter of the grinding worm, before being used for additional machining. During the reprofiling, a profiling means is positioned relative to the worm thread orientation using a rotational axis, wherein the material abrasion occurs at a profiling location, which differs from the machining location in particular, under the effect of the abrasion of a metal material which bonds the abrasive grains.

Description

[0001] Processes of generating grinding of gears and profiling processes

[0002] The invention relates to a method for hard fine machining with geometrically indeterminate cutting edges of gears on workpieces by generating grinding, in which a grinding worm, in particular a multi-start grinding worm with bonded abrasive grains made of, in particular, CBN or diamond, is brought into machining engagement with a gear at a machining location and, after machining one or more workpieces of a workpiece batch, is reprofiled with material removal and thus reducing their center pitch diameter before being used for further machining. During reprofiling, a relative positioning of a profiling means with respect to the worm thread orientation takes place with the inclusion of a rotary axis. Generating grinding of gears is well known to those skilled in the art as one of the dominant methods for hard fine machining of gears.The grinding worms used for this purpose were developed according to two different tool strategies.

[0003] For example, there are galvanically coated metallic worm bodies with a fixed center pitch diameter and a comparatively long service life, which, however, eventually wear out due to the wear of continuous machining and have to be reconditioned by recoating, so-called dressable worms (T. Bausch, Innovative Gear Manufacturing, 3rd edition, p. 519, Figure 14.4-8).

[0004] Secondly, so-called dressable grinding worms have become established, with ceramic- or resin-bonded abrasive grains. As soon as these dressable grinding worms no longer cut sharply enough, they undergo a process called dressing, also known as resharpening or reprofiling. This process results in material removal with each reprofiling pass, thus causing the grinding worm to become increasingly smaller, thus changing its center pitch diameter (T. Bausch, see above, same image).

[0005] The time required for reprofiling depends on the dressing technology used. For example, if dressing rollers are used, so that the dressing process occurs in line contact and continuously with the grinding worm rotating and the corresponding axial displacement of the dresser, the reprofiling process takes so little time that it can even be performed on the generating grinding machine itself, with a correspondingly short interruption to the main machining process.

[0006] In this regard, there are also several variants: either the grinding worm is pivoted from its machining position for generating grinding to a dressing position, dressed there and pivoted back again, or it remains entirely at its machining location and a dresser is moved to the grinding worm and takes over the position in which the workpiece to be ground is otherwise positioned, as disclosed, for example, in EP 1 146 983 B1.

[0007] The invention is based on the object of developing a method of the type mentioned at the outset with regard to a satisfactory combination of the total service life of the grinding worm, process accuracy and service life between two reprofiling processes.

[0008] This object is achieved from a process engineering point of view by a further development of the method of the type mentioned at the outset, which is essentially characterized in that the material removal takes place at a profiling location which is different in particular from the processing location, with removal of a metallic material (M) which binds the abrasive grains.

[0009] The invention is based on the realization that, despite the quite complex geometry of a grinding worm with its worm threads, reprofiling is still possible despite a metallic binding material, and that the longer time required for this can be well accepted compared to conventional dressing, in particular if the profiling location is different from the machining location of the generating grinding and the grinding worm has to be removed from its clamping in a generating grinding machine used for generating grinding.

[0010] Ideally, at least two, in particular more than two, even more than four, and especially more than six, grinding worms suitable for the workpiece batches being machined are available for the process, which can be used in rotation for the process. In this context, it is particularly preferred that a grinding worm change / reprofiling only takes place after a number of workpieces ground by generating grinding with a worm of at least 600, preferably at least 1000, and especially at least 2000.

[0011] In a further preferred embodiment, it is provided that the material removal takes place by carrying out a relative movement between the profiling means and the grinding worm, which movement includes at least two axes of movement, in particular linear axes of movement.

[0012] The path of this relative movement is preferably a zigzag path in an axial section plane through the grinding worm's rotational axis, following the worm thread profile. In the case of a multi-threaded worm, the reprofiling is therefore not performed thread by thread, but rather the movement path crosses worm profiles belonging to different threads. In a further preferred embodiment, the grinding worm rotates / twists around its axis during material removal or during phases of interrupted material removal.

[0013] Reprofiling is preferably carried out segment by segment in an azimuthal segmentation with respect to the worm rotation axis. If reprofiling takes place at a preset worm rotation position (apart from any additional corrective movements) and material is thus removed in discrete reprofiling steps over the circumference of the grinding worm, it is preferred that during one or more roughing passes the grinding worm rotation axis is further indexed by an increment of at least 2 degrees, preferably at least 5 degrees, but also more than 10 degrees, and for one or more finishing passes, in particular the last reprofiling pass, it is further indexed by an increment of at least 0.5 degrees, preferably at least 1 degree and / or no more than 30 degrees, more preferably no more than 20 degrees, in particular no more than 10 degrees.More preferably, the quotient of 360 degrees and the pitch of the screw is an integer multiple of the increment.

[0014] Such discontinuous post-profiling in the azimuthal direction also has the advantage that the resulting polygonal surface structure provides favorable grinding properties (see below). In an alternative design, the grinding worm can also rotate continuously (but especially at a non-constant speed) and thus be profiled in a similar way to line dressing.

[0015] In a further preferred embodiment, the heat involved in material removal is dissipated via a liquid, for which purpose, in particular, both the profiling means and the currently reprofiled screw section are immersed in a liquid bath. This results in more efficient heat dissipation. Furthermore, in this context, it is preferably provided that the liquid in the liquid bath is regularly, in particular continuously, replaced. This allows removed material to be removed immediately and appropriately.

[0016] In a further preferred embodiment, the rotational axis is used to adjust the worm thread orientation in the reprofiling area to a predetermined direction relative to a plane orthogonal to the worm rotation axis. This allows even profiling means subject to geometric constraints to be used. In this context, it is preferably provided that the profiling means has a region subject to tensile stress along this predetermined direction and extending longitudinally along this direction. The profiling means thus has a geometric shape that differs significantly from the dressing rolls typically used for reprofiling grinding worms.

[0017] In a further preferred embodiment, the relative positioning of the profiling means and the grinding worm thread orientation is based on an absolute movement of the grinding worm. This facilitates the maintenance of the tensile stress and, in this regard, does not require any access effort on the profiling means side.

[0018] In a further preferred embodiment, it is provided that continuously successive sections of the profiling means, in particular continuously and successively, reach the area of ​​material removal. This increases the accuracy of reprofiling.

[0019] In yet another preferred embodiment, the material removal is performed by spark erosion, in particular by wire erosion. This further development is based on the further surprising finding that, despite the complex worm gear geometry, the measures explained above allow sufficient machining accuracy even for the wire erosion process, which has been known as such for more than 60 years.

[0020] In terms of device technology, a hard finishing tool with a geometrically undefined cutting edge in the form of a grinding worm for generating gear grinding is provided for a method according to one of the preceding aspects. It is preferably provided that, after the initial profiling, the grinding worm still has a radial re-profiling reservoir of at least 1 mm, preferably at least 2 mm, more preferably at least 5 mm, and in particular at least 10 mm. During production of the blank, a sintering of metallic binding material with the abrasive grains can be carried out, preferably on a metallic base body (radially inward), which is preferably made of steel and more preferably designed as a shaft and in particular hollow in order to be able to be received by a mandrel.In a further preferred embodiment, it is provided that the outer diameter of the grinding worm after the initial profiling is less than 300 mm, more preferably less than 200 mm, in particular less than 120 mm.

[0021] In a further preferred embodiment, the grain size of the abrasive grains is not larger than B151 / D151, more preferably not larger than B91 / D91, in particular not larger than B64 / D64. The metallic binding material of the grinding worm is not particularly limited; for example, a material comprising or consisting of bronze or brass is preferred, but other conductive metallic materials, preferably with a melting point below 1000 degrees Celsius, are also conceivable.

[0022] In a further preferred embodiment, a calibration device is provided in the profiling device for retrieving a defined rotational angular position of the grinding worm. This could be implemented in the form of a mandrel that can only be clamped in a defined rotational position and supports the worm in a defined rotational position, or by a planar tangential plane region provided, for example, axially following an axial worm end and extending orthogonally to the radial direction on the worm rotation axis.

[0023] The calibration device enables the position of the EDM wire in the shift direction, i.e. along an axial axis of the degrees of freedom of movement of a profiling device, to be reliably adjusted for the first time to match the screw thread during reprofiling.

[0024] With regard to reprofiling, the invention provides a method for reprofiling a grinding worm according to claim 9, comprising the steps of material removal and the relative positioning carried out therefor according to claim 1 and in particular one or more steps of the characterizing features of claims 2 to 8. The advantages of this reprofiling method emerge from the above explanations of the preceding claims.

[0025] Accordingly, the invention also protects a profiling device for such profiling, i.e., a profiling device for profiling a grinding worm configured according to claim 9, comprising a positioning device having a rotary axis for relative positioning of a profiling means with respect to the worm thread orientation, and in particular, a fluid-filled receiving space for accommodating at least one region of the grinding worm undergoing material removal and an abrasive region of the profiling means. The advantages of such a profiling device are also already apparent from the above explanations.

[0026] In a simple design variant of such a profiling device, it can be provided to couple a positioning device with a rotatable and rotatable holder for receiving a grinding worm and to integrate this coupled device into a system already having two linear positioning axes, for example EDM devices available on the market.

[0027] However, it is also possible to consider a targeted redesign of a suitable wire EDM machine, including the possibility of integrating it into a generating grinding machine and using the motion axes of the gear worm during generating grinding for profiling. In the latter case, the grinding oil is also preferably used as a dielectric during generating grinding.

[0028] In further preferred embodiments, a profiling device according to claim 11 is provided, with a device for rotating the grinding worm about its own axis of rotation, and a further positioning system with at least two further degrees of freedom of movement for the relative position between the grinding worm and the profiling means, wherein one degree of freedom has a movement component in the plane orthogonal to the worm axis of rotation and the other further degree of freedom has at least one directional component parallel to the worm axis of rotation.

[0029] In a further preferred embodiment, a profiling device according to claim 12 is provided, with a control which, in an operating mode with a positioned rotary axis and positioned rotational position of the grinding worm, allows a relative movement to be carried out along a zigzag path involving the two further degrees of freedom of movement and corresponding to the worm profile in axial section.

[0030] In a further preferred embodiment, a profiling device according to one of claims 11 to 13 is provided, in which the / a control device of the profiling device, in a second operating mode, superimposes superimposed movements via a positioning and a zigzag path in order to subject the surfaces of the worm threads to a modification which, in particular, modifies a profile angle modification, a profile line crowning, a tip and / or root relief in order to produce a corresponding modification on the roller-ground workpiece during generating grinding with the grinding worm profiled in this way, wherein the modification profiled onto the grinding worm includes, in particular, a coordinated superimposition of these modifications and the modification includes a correction compensating for the further profiling in each case and the resulting changed center pitch diameter.

[0031] In particular, the positioning and feed movements during the profile run are automatically executed by the control unit of the profiling device and also carried out by means of a closed-loop control. As is usual with EDM, in addition to the geometric parameters to be generated, additional input parameters such as the machining precision entered as a radius and a desired cutting performance can be specified / entered, and a typical EDM software function automatically sets the additional EDM parameters. For example, the feed rate can be controlled as a function of the current strength, the distance between the wire and the screw thread surface to be machined, and the desired material removal.It is understood that, depending on the material selected for the grinding worm, a test and learning phase can be used to determine which wire EDM parameters result in which removal, and to determine this by means of conventional measurement of gear worms, and the parameters of the profiling device designed as an EDM machine as well as the feed rates used are adjusted to one another in order to initially profile and then re-profile the grinding worm profile designed in the usual way for the generating grinding process.

[0032] In order to make the modifications to the grinding worm profile described above, in order to create or compensate for corresponding tooth flank modifications on the gear-ground workpieces, the wire axis is not available as a degree of freedom in the wire EDM process. Because, among other things, discontinuous profiling is also selectable as described above, the degrees of freedom ÖA, ÖB, ÖX, and ÖY are generally available as modifying superimposed movements for shaping the worm thread profiles, in addition to the basic profiling via the axial and radial positioning axes described above in the form of linear motion axes X, Y, as well as the rotational axis B and pivot axis A (the rotary relative positioning axis). This provides a similar degree of freedom potential as with so-called mechanical line dressing.The "polygonal structures" created by azimuthally discrete reprofiling can be refined accordingly by refining the timing, so that in this respect, too, a close correspondence to a contact area of ​​line dressing can be created. It goes without saying that the profiling device described above can also be used for the initial profiling of the grinding worm according to the invention. For this purpose, a comparatively slow, single pass through the solid material with regard to the radial depth can be carried out by means of a "carving out" process. As soon as the timing continues in the direction of the worm's rotation, an axial displacement by the corresponding pitch component must of course be carried out in order to maintain the worm thread geometry, corresponding to the kinematic coupling between the dresser and the worm rotation (axial displacement to worm rotation) that occurs during conventional dressing.

[0033] In a preferred process design for generating grinding, it is also provided that the generating grinding worm is multi-started, preferably with a number of starts of at least 3, more preferably at least 4, in particular at least 5, and / or has a center pitch angle of more than 2 degrees, preferably more than 4 degrees. A value in the range [0.5; 5] is preferred as the worm module.

[0034] In a further preferred process design, as already explained above, a polygonal surface structure is applied during reprofiling with respect to the circumferential direction of the generating grinding worm. This contributes positively to reducing the grinding pressure and also leads to an improved supply of coolant / lubricant.

[0035] The process aspect of reprofiling by spark erosion, in particular wire erosion of generating grinding worms, could also be used for bonding materials that are non-metallic in nature but are nevertheless conductive or made conductive, such as carbon compounds or synthetic resin bonds made conductive by, for example, metal additives. This aspect is disclosed by the invention as also independent and independently worthy of protection. The invention thus also relates to a method for hard finishing with geometrically indeterminate cutting edges of gears on workpieces by generating grinding, in which a grinding worm, in particular a multi-start grinding worm with bonded abrasive grains made of, in particular, CBN or diamond, is brought into machining engagement with a gear at a machining location and, after machining one or more workpieces of a workpiece batch, is reprofiled, removing material and thereby reducing their center pitch diameter.before being used for further processing, wherein, during reprofiling, a relative positioning of a profiling means with respect to the screw thread orientation is carried out using a rotary axis, and wherein the material removal takes place at a profiling location, in particular different from the processing location, by spark erosion, in particular by wire erosion, removing a conductive or conductive material that binds the abrasive grains. The above statements regarding corresponding gear worms and initial profiling apply analogously.

[0036] In a generating grinding worm with differently designed axial regions, which is also considered by the invention, one or more of these regions can be made of a non-metallic but conductive binder material, for example a polishing region, and this can nevertheless be re-profiled together with the other, e.g. metallic, region(s) for roughing and / or finishing generating grinding.

[0037] Further features, details and advantages of the invention will become apparent from the following description with reference to the accompanying figures, of which Figures 1A to 1C schematically illustrate an azimuthally discrete profiling,

[0038] Fig. 2 shows the path of a feed movement during reprofiling,

[0039] Fig. 3 shows the arrangement of a calibration surface near an axial grinding worm end, Fig. 4A, 4B shows the positioning of a profiling means with respect to the worm thread orientation.

[0040] First, a machining sequence for the initial profiling of a grinding worm is described with reference to Fig. 1 in the sequence 1A to 1C. A blank for the later grinding worm 1, initially cylindrical in shape and with a completely unmachined surface 2, is pre-profiled in a start profiling area 3 in a given rotational position of the worm rotational axis B. The worm flights in area 3 are created with a cut into the solid material, and the resulting material chips fall into a bath in which the grinding worm 1 is at least partially immersed for profiling. This process is repeated several times in a rotated position until the profiled area 3 extends over the entire circumference of the worm, with the cutting means being shifted from one B-cycle to the next by the corresponding pitch along the axial worm axis Z. In a given rotational position, the cutting means travels a radial-axial path s, as shown in Fig.2. During roughing (Fig. 1B), the cycle is incremented by a total of (n-1) times between two cycles, resulting in a segment-like structure of polygonal character in the azimuthal direction, which becomes finer the larger n is selected. Roughing itself can be performed in one or more passes, i.e., with different radial cutting depths, but preferably in a single pass.

[0041] The final screw geometry is preferably achieved via one or several finishing passes. These are essentially the same as the roughing passes, but preferably with finer gradations by means of a 3607m cycle, with preferably m>n. In a specific embodiment, n could be, for example, 72, and m, for example, 180. It is understood that the axial displacement in Z changes accordingly after the rotation AB=3607n or 3607m, depending on the associated pitch ratio.

[0042] In one embodiment, a flat tangential surface 6 is formed as an orientation surface on an axial end side of the worm 1, so that a straight line (g) extending parallel to the tangential surface is assigned to a worm rotation position Bo associated with this tangential plane position. This tangential surface thus serves as a calibration surface 6. It is arranged on a sleeve 16, which, like the grinding worm 1, is arranged on a mandrel 12.

[0043] The screw depicted in Fig. 2 is a double-flight screw. However, the invention particularly preferably also provides for even multi-flight screws, although it is also applicable to single-flight screws. In the multi-flight case, the path s traverses the multiple flights successively, and profiling is not performed flight by flight, but rather azimuthally in sections, thus profiling multiple flights in a single profiling pass.

[0044] 4A and 4B, the grinding worm 1 at the profiling location is not only rotatable about its own axis with rotation axis B, but also pivotable about pivot axis A. The grinding worm 1 can be pivoted via pivot axis A into a pivot position (Ao) in which the worm flights 4 run towards the machining side along a predetermined orientation, which in the exemplary embodiment according to Fig. 4 corresponds to a height axis H. In this vertical orientation, the pivot angle Ao therefore corresponds to the pitch angle of the grinding worm 1. A pivoting unit for pivoting the grinding worm is designated by reference numeral 20 in Fig. 4A, and a rotating unit for rotating the grinding worm 1 about its own axis is designated by reference numeral 10. In this exemplary embodiment, both HSK profiling mandrels for the grinding worm 1 and an adapter coupling for clamping are designed in a stainless steel version.The bath in which the profiling process takes place, as well as its edges, are not shown in Fig. 4A, B for the sake of simplicity.

[0045] The structure of the grinding worm 1 in this embodiment has a radially inner steel body that supports an outer body made of bronze or brass with CBN abrasive grains bonded therein. The outer diameter during initial profiling in this embodiment is 80 mm, that of the steel body is 55 mm. Accordingly, the grinding worm can be reprofiled over a radial depth of 12.5 mm less the thread depth. The reprofiling itself is carried out in a very similar manner to the initial profiling described above, except that it may be sufficient to perform the finishing step (Fig. 1C). However, a zero position for the subsequent positioning of the profiling tool can be found beforehand using the calibration surface 6. However, this calibration surface is only a specific variant of a calibration device for relocating the worm's rotational position, and the invention is not limited to this. Roughing can also be carried out prior to reprofiling.

[0046] In this embodiment, the grinding mechanism for profiling is spark erosion, and specifically, the wire erosion process is used. In Fig. 4A, B, the wire for the wire erosion process is designated by reference numeral 30, and its diameter is preferably in the range of 0.05 mm to 0.5 mm. Accordingly, the grinding worm 1 is wetted with a liquid, at least in the area of ​​its machining (the liquid serves as a dielectric for the process), and an electrical voltage is applied between the erosion wire 30 and the conductive material M of the grinding worm 1 to be removed. For example, a standard commercially available erosion machine could be used as the erosion machine, although it would have to be modified to provide the intended rotation and pivot axes (B, A), such as the combined pivot and rotation unit (20, 10) as shown in Fig. 4A. In addition, the eroding wire 30 is in the positions shown in Fig.4A, are movable relative to the screw 1 in order to travel the path s (Fig. 2).

[0047] Furthermore, the grinding worm 1 can have different areas along its axial extent with regard to their cutting performance or grain size. For example, a roughing grain can be used in a first axial area, and a finishing grain, i.e., a finer grain, can be used in a second axial area. For example, one metallic binding material that binds the abrasive grains can be provided with a coarse filling and another with a fine filling. However, the reprofiling of both areas can be performed in a single operation. Alternatively, two separately manufactured wheels could be combined to form a combination tool.

[0048] In a simple design, the unit with the pivoting unit 20 and the rotating unit 10 is arranged such that the entire grinding worm 1 is immersed in a bath with a liquid, preferably water as dielectric, wherein the liquid can also be a special liquid or oil according to the EDM dielectric function otherwise used.

[0049] After reprofiling, the grinding worm 1 can be returned to the generating grinding machine and continue its use.

[0050] The above specifications are intended to illustrate the invention and are not to be seen as limitations on the following claims.

Claims

Claims 1. A method for hard fine machining with geometrically indeterminate cutting edges of gears on workpieces by generating grinding, in which a grinding worm (1), in particular a multi-start grinding worm with bonded abrasive grains made of in particular CBN or diamond, is brought into machining engagement with a gear at a machining location and, after machining one or more workpieces of a workpiece batch, is re-profiled with material removal and thereby reducing their center pitch diameter before it is used for further machining, wherein during re-profiling, a relative positioning of a profiling means (30) with respect to the worm thread orientation takes place with the inclusion of a rotary axis (A), characterized in that the material removal takes place at a profiling location which is in particular different from the machining location, with removal of a metallic material (M) which binds the abrasive grains.

2. Method according to claim 1, in which the material removal takes place by carrying out a relative movement between the profiling means and the grinding worm, in particular involving two linear axes of movement (X, Y).

3. Method according to claim 1 or 2, wherein during the material removal or material removal interrupted in phases, a rotation / twisting (B) of the grinding worm about its axis takes place.

4. Method according to one of the preceding claims, in which heat involved in the material removal is dissipated via a liquid, for which purpose in particular both the profiling means (30) and the currently re-profiled screw region are immersed in a liquid bath.

5. Method according to one of the preceding claims, in which a calibration device for re-finding a defined rotational angle position of the grinding worm is provided in a profiling device arranged at the profiling location, for example in the form of a mandrel which can only be clamped in a defined rotational position and which supports the worm in a defined rotational position or for example by a planar tangential plane area which is provided, for example, axially following an axial worm end and extending orthogonally to the radial direction on the worm rotation axis, and by means of the Calibration device via the rotary axis a screw thread orientation in the post-profiling area can be adjusted to a predetermined direction (g) with respect to a plane orthogonal to the screw rotation axis.

6. The method according to claim 5, wherein the profiling means has a region which is under tensile stress along said predetermined direction and which extends longitudinally along said direction.

7. Method according to one of the preceding claims, in which continuously successive sections of the profiling means, in particular continuously successively, reach the area of ​​material removal.

8. Method according to one of the preceding claims, in which the material removal is carried out by spark erosion, in particular by wire erosion.

9. Hard finishing tool with a geometrically indeterminate cutting edge in the form of a grinding worm for generating gear grinding for a method according to one of the preceding claims.

10. Method for reprofiling a grinding worm according to claim 9, comprising the steps of material removal and the relative positioning carried out therefor according to claim 1 and in particular one or more steps of the characterizing features of claims 2 to 8.

11. Profiling device for profiling a grinding worm designed according to claim 9, with a positioning device (20) having a rotary axis (A) for the relative positioning of a profiling means with respect to the worm thread orientation, and in particular a liquid-filled receiving space for receiving at least one region of the grinding worm undergoing material removal and an abrasive region of the profiling means (30).

12. Profiling device according to claim 11, with a device (10) for rotating the grinding worm about its own axis of rotation, and a further positioning system with at least two further degrees of freedom of movement for the relative position between the grinding worm and the profiling means, wherein one degree of freedom is a movement component in the plane orthogonal to the axis of rotation of the worm and the other further Degree of freedom has at least one directional component parallel to the screw rotation axis.

13. Profiling device according to claim 12, with a control which, in one operating mode with a positioned rotary axis and positioned rotational position of the grinding worm, allows a relative movement along a zigzag path (s) involving the two further degrees of freedom of movement and corresponding to the worm profile in axial section to be carried out.

14. Profiling device according to one of claims 11 to 13, in which the / a control device of the profiling device in a second operating mode superimposes movements (ÖA, ÖB, ÖX, ÖY) via a positioning (Ao, B m ) and a zigzag path (s) is superimposed in order to subject the surfaces of the worm threads to a modification which in particular modifies a profile angle modification, a profile line crowning, a tip and / or root relief in order to produce a corresponding modification on the generating-ground workpiece during generating grinding with the grinding worm profiled in this way, wherein the modification profiled onto the grinding worm includes in particular a coordinated superposition of these modifications and the modification includes a compensating correction by means of the respective further profiling and the resulting changed center pitch diameter.

15. Use of a profiling device according to one of claims 11 to 14 for producing a grinding worm according to claim 9 by its initial profiling, in which a grinding worm blank is machined by the profiling means and the grinding worm threads are thereby formed for the first time.

16. Method according to one of claims 1 to 10, wherein during reprofiling a polygonal surface structure is applied with respect to the circumferential direction of the generating grinding worm.

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