Gear generating grinding method and profile method

Abstract

The invention relates to a method for the hard finish machining of gear teeth on a workpiece by means of generating grinding using a geometrically undefined cutting edge, in which a grinding worm, in particular a multi-head grinding worm with bonded abrasive grains, in particular made of CBN or diamond, is brought into machining engagement with the gear teeth at a machining position, the invention relates to a method for machining a grinding worm in a batch of workpieces, and the grinding worm is re-profiled after machining one or more workpieces in the batch of workpieces so as to be subjected to material removal and thus reduce the central pitch diameter of the grinding worm before the grinding worm is used for additional machining, the profiled member is positioned relative to the worm thread orientation by means of the axis of rotation, in which the material removal takes place at a profiled position, in particular different from the machining position, in which the metal material for bonding the abrasive particles is removed.

Description

[0001] The invention relates to a method for hard finishing gear teeth on a workpiece using a geometrically undefined cutting edge by means of generating grinding, wherein a grinding worm, in particular a multi-start grinding worm having bonded abrasive grain, in particular made of CBN or diamond, is brought into machining engagement with the gear teeth at a machining location and, after machining one or more workpieces of a workpiece batch, the grinding worm is re-profiled so as to undergo material removal and thus reduce its central pitch diameter before it is used for further machining, wherein during the re-profiling, the profiling element is positioned relative to the worm thread orientation by means of the axis of rotation.

[0002] As one of the main methods for hard finishing of gear teeth, generating grinding of gears is well known to those skilled in the art. Grinding worms for this purpose have been developed according to two different tool strategies.

[0003] For example, there are electroplated coated metal worm bodies which have a fixed defined center pitch diameter and a relatively long service life, which, however, eventually wear out due to wear from continuous machining and have to be repaired by recoating, so-called non-repairable worms (T. Bausch, Innovative Zahnradfertigung, 3rd edition, page 519, Figures 14.4-8).

[0004] On the other hand, so-called dressable grinding worms have been realized with ceramic or resin-bonded abrasive grain. As soon as these dressable grinding worms are no longer sharp enough for cutting, they are dressed, also known as resharpening or re-profiling, which results in material being removed with each re-profiling step and the grinding worm becoming smaller and smaller, i.e., its central pitch diameter changes (T. Bausch, see above, same figure).

[0005] The time required for re-profiling depends on the dressing technology used. If, for example, dressing rollers are used so that the dressing process takes place continuously and in a linear contact manner with the grinding worm rotating and the dresser undergoing a corresponding aligned axial displacement, the re-profiling process takes only a short time and can even be carried out on the generating grinder itself, with correspondingly short interruptions to the main machining process.

[0006] In this respect, there are also several variants: the grinding worm is pivoted from its generating grinding machine position into a dressing position, where it is dressed and pivoted back again; or the grinding worm remains completely in its machining position and the dresser is moved to the grinding worm and approximately to the position in which the workpiece to be ground is positioned in another way, as disclosed, for example, in EP 1 146 983 B1.

[0007] The object of the present invention is to further develop a method of the aforementioned type in such a way as to achieve a satisfactory combination of machining accuracy, total service life of the grinding worm, and service life between two re-profiling processes.

[0008] From a process engineering perspective, the object is achieved by further developing a method of the type described above, which is essentially characterized in that material removal takes place at a profiling location, in particular different from the machining location, wherein the metal material (M) used to bond the abrasive grains is removed.

[0009] The invention is based on the recognition that, despite the very complex geometry of the grinding worm and its worm thread, re-profiling is still possible even in the presence of metallic bonding material and that the longer times required for this can be well tolerated compared to conventional dressing, in particular if the profiling position differs from the machining position of the generating grinder and the grinding worm has to be removed from its generating grinding clamping in the generating grinder.

[0010] Ideally, at least two, in particular more than two, even more than four, and in particular more than six grinding worms suitable for the batch of workpieces being machined are available for the method, and can be used in an alternating rotational manner. In this case, it is particularly preferred that, when performing generating grinding with the worms, the grinding worms are not replaced / re-profiled until at least 600, preferably at least 1000, and in particular at least 2000 workpieces have been ground.

[0011] In a further preferred embodiment, provision is made for the material removal to take place by performing a relative movement between the profile member and the grinding worm, said movement comprising at least two movement axes, in particular linear movement axes.

[0012] The path of this relative movement is preferably a zigzag path in an axial section plane through the axis of rotation of the grinding worm, which follows the worm thread profile. Thus, in the case of a multi-start worm, re-profiling is not performed start by start, but rather by moving the path through the thread profiles belonging to different starts.

[0013] In a further preferred embodiment, provision is made for the grinding worm to rotate / rotate about its axis during the material removal process or in phases in which the material removal is interrupted.

[0014] The re-profiling is preferably performed segment by segment, with the segmentation being azimuthally segmented relative to the worm's axis of rotation. If the re-profiling takes place at predetermined worm rotational positions (in addition to any additional corrective movements) and material is thus removed in discrete re-profiling steps over the circumference of the grinding worm, it is preferred that the grinding worm's axis of rotation is driven in increments of at least 2 degrees, preferably at least 5 degrees, but also greater than 10 degrees, in one or more roughing passes, and in increments of at least 0.5 degrees, preferably at least 1 degree, and / or not greater than 30 degrees, more preferably not greater than 20 degrees, and in particular not greater than 10 degrees, for one or more finishing passes, in particular the final re-profiling pass. More preferably, the quotient of 360 degrees and the number of worm starts is an integer multiple of the increment.

[0015] Such a re-profiling that is discontinuous in the azimuthal direction also has the advantage that the resulting polygonal surface structure produces advantageous properties during grinding, see below. In an alternative embodiment, the grinding worm can also rotate continuously (but in particular at a non-constant speed) and thus be profiled in a manner similar to linear dressing.

[0016] In another preferred embodiment, the heat involved in material removal is dissipated via a liquid. To this end, in particular, both the profiling component and the worm region currently being reprofiled are immersed in a liquid bath. This results in more effective heat dissipation. In this case, it is also preferred to regularly, in particular even continuously, replace the liquid in the liquid bath. This means that the removed material can be removed immediately, if necessary.

[0017] In another preferred embodiment, provision is made for the worm thread orientation in the re-profiling region to be arranged in a predetermined direction via the rotation axis relative to a plane extending orthogonally to the worm rotation axis. In this way, even profiling components with geometrical limitations can be used.

[0018] In this case, it is preferably provided that the profiling member has a region under tensile stress along the predetermined direction, said region extending longitudinally along this direction.The profiling member thus has a geometry that differs significantly from re-profiling dressing rollers commonly used for grinding worms.

[0019] In another preferred embodiment, the relative positioning of the profiling member and the grinding worm thread orientation is based on the absolute movement of the grinding worm. This makes it easier to maintain the tensile stress and does not require any effort to access the profiling member.

[0020] In a further preferred embodiment, it is provided that the continuously successive parts of the profiling component enter the material removal region, in particular in a continuously successive manner. This increases the re-profiling accuracy.

[0021] In a further preferred embodiment, the material removal is carried out by means of electrical discharge machining, in particular by means of wire erosion. This further development is based on the surprising finding that, despite the complex geometry of the worm thread, this measure allows sufficient machining accuracy even with the wire erosion method, which has been known for more than 60 years.

[0022] In terms of device technology, a hard finishing tool for a method according to any of the aforementioned aspects is provided, which hard finishing tool is in the form of a grinding worm for forming grinding of gears with geometrically undefined cutting edges. Preferably, it is provided that the grinding worm still has a radial re-forming reserve of at least 1 mm, preferably at least 2 mm, more preferably at least 5 mm and in particular at least 10 mm after the initial profiling. During the production of the blank, the metal bonding material can be sintered together with the abrasive grains, preferably on a (radially inwardly positioned) metal body, which is preferably made of steel and more preferably embodies a shaft and is in particular hollow so that it can be received by a spindle. In a further preferred embodiment, it is provided that after the initial profiling, the outer diameter of the grinding worm is less than 300 mm, more preferably less than 200 mm, in particular less than 120 mm.

[0023] In another preferred embodiment, the particle size of the abrasive grains is not greater than B151 / D151, more preferably not greater than B91 / D91, and in particular not greater than B64 / D64. The metal bond material of the grinding worm is not particularly limited; for example, materials comprising or consisting of bronze or brass are preferred, but other conductive metal materials are also contemplated, preferably having a melting point below 1000 degrees Celsius.

[0024] In another preferred embodiment, a calibration device is provided for determining a defined rotational angle position of the grinding worm in the profiling device. This can be implemented in the form of a spindle that can only be clamped in a defined rotational position and supports the worm in that position, or by means of a planar cutout region that is, for example, arranged axially behind the axial worm end and extends orthogonally to the radial direction on the worm's axis of rotation.

[0025] The calibration device enables a reliable initial adjustment of the position of the eroding wire in the displacement direction (ie along the axial axis of the freedom of movement of the profiling device) to match the worm thread during re-profiling.

[0026] With regard to re-profiling, the present invention provides a method for re-profiling a grinding worm according to claim 9, comprising the steps of material removal and relative positioning according to claim 1 and, in particular, one or more of the steps characterizing the features of claims 2 to 8. The advantages of the re-profiling process will be apparent from the above description of the preceding claims.

[0027] Accordingly, within the scope of the present invention is also a profiling device for such profiling, i.e., a profiling device for profiling a grinding worm according to claim 9, the profiling device comprising a positioning device having a rotation axis for relative positioning of the profiling member with respect to the orientation of the worm thread, and in particular a liquid-filled receiving space for receiving at least one region of the grinding worm to be subjected to material removal and a grinding region of the profiling member. The advantages of such a profiling device will also be apparent from the above description.

[0028] In a simple design variant of such a profiling device, provision can be made to couple the positioning device to a rotatable and twistable receptacle for receiving the grinding worm and to integrate this coupled device into a system which already has two linear positioning axes, such as, for example, commercially available erosion devices.

[0029] However, it should be understood that a targeted redesign of a suitable wire eroding machine could also be considered, including the possibility of integrating it into a generating grinder and being able to use the moving axis of the generating worm for profiling during generating grinding. In the latter case, grinding oil is also preferably used as the dielectric medium during generating grinding.

[0030] In a further preferred embodiment, a profiling device according to claim 11 is provided, comprising means for rotating the grinding worm about its own axis of rotation and an additional positioning system with at least two additional movement degrees of freedom for the relative position between the grinding worm and the profiling member, wherein one degree of freedom has a movement component in a plane extending orthogonally to the axis of rotation of the worm and the other additional degree of freedom has at least one directional component parallel to the axis of rotation of the worm.

[0031] In a further preferred embodiment, a profiling device according to claim 12 is provided, which comprises a controller which, in an operating mode with a positioned rotational axis and a positioned rotational position of the grinding worm, allows a relative movement along a zigzag path involving two additional degrees of freedom of movement and corresponding to the worm profile in axial section.

[0032] In a further preferred embodiment, a profiling device according to any one of claims 11 to 13 is provided, wherein, in a second operating mode, the control device of the profiling device superimposes the superimposed movements of the positioning and the zigzag path so as to subject the surface of the worm thread to a modification, which modification in particular modifies the profile angle modification, the profile convexity, the tooth addendum and / or the tooth root correction in order to produce corresponding modifications on the generated workpiece during generation grinding with the grinding worm profiled in this modified manner, wherein the modification profiled to the grinding worm in particular comprises a coordinated superposition of these modifications and comprises a corrective compensation for the additional profiling and the resulting changed center pitch diameter.

[0033] In particular, the positioning and feed movements during the prescribed profiling passes are automatically performed by the control device of the profiling device and also by means of closed-loop control. As is common during erosion, in addition to the geometric parameters to be generated, additional input parameters such as the machining fineness as a radius input and the desired cutting performance can also be specified / entered, and typical erosion software functions automatically set the additional erosion parameters. For example, the feed rate can be controlled as a function of the current intensity, the distance between the wire and the worm thread surface to be machined, and the desired removal rate. It will be understood that, depending on the material selected for the grinding worm, a test and learning phase can be used to determine which wire erosion parameters lead to which type of removal, and this can be determined by means of conventional measurements of the generated worm, and the feed rate and the parameters of the profiling device embodied in the erosion machine can be set in a mutually coordinated manner so that a grinding worm profile designed in the usual manner for generating grinding is first profiled and then re-profiled, respectively.

[0034] In order to carry out the above-mentioned modifications to the grinding worm profile in order to produce or compensate for corresponding tooth flank modifications on the generated, ground workpiece, the wire axis has no degrees of freedom during the wire erosion process. Furthermore, since discontinuous profiling can be selected as described above, in addition to the above-mentioned basic profiling, the available degrees of freedom are essentially δA, δB, δX, δY as a modified superimposed movement for forming the worm thread profile via the linear movement axes X, Y and the axial and radial positioning axes in the form of the rotation axis B and the pivot axis A (relative rotation positioning axes), and thus a similar degree of freedom selection is possible as with so-called mechanical straight-line dressing. The "polygonal-like structure" produced by azimuthally discrete re-profiling can be refined accordingly by means of refinement increments, so that in this respect, too, a close correspondence with the straight-line dressing contact area can be achieved.

[0035] It will be appreciated that the profiling device described above can also be used for the initial profiling of a grinding worm according to the invention. To this end, a single "engraving" can be performed that is relatively slow in terms of radial depth through the solid material. Of course, as the drive continues in increments in the direction of worm rotation, an axial displacement corresponding to the pitch ratio must be performed in order to maintain the worm thread geometry, corresponding to the kinematic coupling between the dresser and the worm rotation that occurs during conventional dressing (axial displacement to worm rotation).

[0036] In a preferred embodiment of the generating grinding method, it is further provided that the generating grinding worm is multi-start, the number of starts preferably being at least 3, more preferably at least 4, in particular at least 5, and / or having a center pitch angle of greater than 2 degrees, preferably greater than 4 degrees. A value in the interval [0.5; 5] is preferred as the module of the worm.

[0037] In another preferred method design, as already explained above, provision is made for a polygonal surface structure to be generated in the circumferential direction of the generated grinding worm during re-profiling. This contributes positively to a reduction in grinding pressure and also improves the coolant / lubricant supply.

[0038] The aspect of the method for re-profiling by electrical discharge machining (particularly wire erosion for generating a grinding worm) can also be applied to bonding materials that are essentially non-metallic but are still electrically conductive or made electrically conductive, such as carbon compounds or synthetic resin bonding materials that are made electrically conductive by, for example, metallic additives. This aspect is also disclosed in the present invention and is independent in itself and worthy of protection. The present invention therefore also relates to a method for hard finishing gear teeth on a workpiece using a geometrically undefined cutting edge by means of generating grinding, wherein a grinding worm, in particular a multi-start grinding worm having bonded abrasive grain, in particular made of CBN or diamond, is brought into machining engagement with the gear teeth at a machining location and, after machining one or more workpieces of a workpiece batch, the grinding worm is re-profiled, thereby undergoing material removal and thus reducing the central pitch diameter of the grinding worm before it is used for further machining, wherein during the re-profiling, the profiling element is positioned relative to the worm thread orientation by means of the axis of rotation, wherein material removal occurs at a profiling location, in particular different from the machining location, wherein the conductive or electrically conductive material used to bond the abrasive grain is removed by means of electrical discharge machining, in particular by means of wire erosion. The above statements regarding the corresponding generating worm and initial profiling apply analogously.

[0039] In generating grinding worms with axial zones of different designs, which are also envisaged by the present invention, one or more of these zones can be made of a non-metallic but electrically conductive bonding material, such as a polishing zone, and this zone can still be re-profiled together with other, for example, metallic zones for roughing and / or finishing generating grinding.

[0040] Further features, details and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings, in which:

[0041] Figures 1A to 1C The azimuth discrete profiling is schematically shown,

[0042] Figure 2 Depicts the path of the feed movement during re-profiling,

[0043] Figure 3 Depicts the arrangement of the calibration surfaces near the end of the axially ground worm,

[0044] Figure 4A 、 Figure 4B The positioning of the contoured member relative to the worm thread orientation is depicted.

[0045] First, using FIG1 , the machining sequence for the initial profiling of a grinding worm is described in the sequence 1A to 1C. In a given rotational position of the worm rotation axis B, in an initial profiling region 3, a blank for the future grinding worm 1 of initially cylindrical shape and having a completely unmachined surface 2 is pre-profiled. The worm thread in the region 3 is produced by cutting into solid material, the resulting material fragments falling into a bath in which the grinding worm 1 is at least partially immersed for profiling. This process is repeated several times in the rotational position until the profiling region 3 extends over the entire circumference of the worm, wherein the cutting member is shifted along the axial worm axis Z from one rotation B increment to the next rotation B increment in a corresponding pitch ratio. In a given rotational position, the cutting member travels a radial-axial path s, as Figure 2 shown.

[0046] During roughing ( Figure 1B ), the rotation is continued a total of (n-1) times between two increments by 360° / n, so that a segmented structure of polygonal features is produced in the azimuthal direction, which becomes finer as n increases. The roughing process itself can be carried out in one or more passes, i.e. with different radial cutting depths, but is preferably carried out in only one pass.

[0047] The final worm geometry is preferably achieved in one or more finishing passes. These are performed essentially like the roughing passes, but preferably with finer steps by driving in increments of 360° / m, where m>n is preferred. In a specific example embodiment, n can be, for example, 72, and m can be, for example, 180. It will be understood that after a rotation of ΔB = 360° / n or 360° / m, the axial displacement in the Z direction changes accordingly, depending on the corresponding pitch ratio.

[0048] In one embodiment, a flat tangential surface 6 is formed as an orientation surface on the axial end side of the worm 1, so that a straight line (g) extending parallel to the tangential surface corresponds to the worm rotation position B0 associated with the tangential position. Thus, the tangential surface serves as a calibration surface 6. It is arranged on a sleeve 16, which is arranged on the spindle 12, just like the grinding worm 1.

[0049] Figure 2 The worm shown in FIG is a double-start worm, but the invention particularly preferably also provides worms with more than one start, but is also applicable to single-start worms. In the case of multiple starts, the path s passes through the multiple starts one after another, and the profiling is not performed head by head, but rather in azimuthal zones, thus performing multiple starts in one profiling pass.

[0050] As from Figure 4A and Figure 4B It can be seen that in the profiling position, the grinding worm 1 can not only rotate about its own axis about the rotation axis B, but also pivot about the pivot axis A. Via the pivot axis A, the grinding worm 1 can be moved into a pivot position (A0) in which the worm thread 4 extends toward the machining side along a predetermined orientation, which corresponds to the height axis H in the exemplary embodiment according to FIG. 4 . In this vertical alignment, the pivot angle A0 therefore corresponds to the pitch angle of the grinding worm 1. Figure 4A In the embodiment, the pivoting unit for pivoting the grinding worm is denoted by reference numeral 20, and the rotating unit for rotating the grinding worm 1 about its own axis is denoted by reference numeral 10. In this exemplary embodiment, both the HSK contoured spindle for the grinding worm 1 and the adapter coupling for clamping are designed in stainless steel. Figure 4A 、 Figure 4B Neither the bath in which the profiling process takes place nor its edges are depicted.

[0051] In this exemplary embodiment, the design of the grinding worm 1 comprises a radially inner steel body carrying an outer body made of bronze or brass with CBN abrasive grains bonded therein. In this exemplary embodiment, the outer diameter during initial profiling is 80 mm, and the outer diameter of the steel body is 55 mm. Accordingly, the grinding worm can be re-profiled to a radial depth of 12.5 mm minus the thread depth. The re-profiling itself is performed in a very similar manner to the initial profiling described above, except that it may be sufficient to perform a finishing operation ( Figure 1C ), although a calibration surface 6 can be used to find the zero position for the subsequent positioning of the profiling element. However, this calibration surface is only a specific variant of the calibration device for determining the rotational position of the worm, and the invention is not limited thereto. Roughing can also be performed before re-profiling.

[0052] In this exemplary embodiment, the grinding mechanism used for profiling is electrical discharge machining, and specifically uses a wire erosion method. Figure 4A 、 Figure 4B In the embodiment of the present invention, the wire used for the wire erosion process is identified by reference numeral 30 and preferably has a diameter in the range of 0.05 mm to 0.5 mm. Thus, the grinding worm 1 is wetted with a liquid at least in its machining area (the liquid serving as a dielectric medium for the process) and a voltage is applied between the eroding wire 30 and the conductive material M to be removed of the grinding worm 1. For example, the erosion machine can be a standard commercial erosion machine, which, however, must be modified to provide the desired rotation and pivot axes (B, A), such as by Figure 4A The combined pivoting and rotating unit (20, 10) shown is realized. In addition, the erosion wire 30 can be moved relative to the worm 1 along Figure 4A The linear movement axes X, Y shown move so as to move along the path s( Figure 2 ) move forward.

[0053] Furthermore, the grinding worm 1 can have different regions along its axial extent with regard to cutting performance or grain size. For example, coarse abrasive grains can be used in a first axial region, and fine abrasive grains (i.e., finer abrasive grains) can be used in a second axial region. For example, it is conceivable that one metallic bonding material for bonding the abrasive grains has a coarse filler, while another has a fine filler. However, reshaping of both regions can be performed in a single pass. Alternatively, two separately manufactured discs can be combined to form a combined tool.

[0054] 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 medium, wherein the liquid can also be a special liquid or oil depending on its function as EDM dielectric medium.

[0055] After reprofiling, the grinding worm 1 can be returned to the generating grinding machine and used further.

[0056] The above description is intended to illustrate the present invention and should not be construed as limiting the following claims.

Claims

1. A method for hard finishing a gear tooth on a workpiece by means of generating grinding with a geometrically undefined cutting edge, wherein: A grinding worm (1), in particular a multi-start grinding worm with bonded abrasive grain, in particular made of CBN or diamond, is brought into machining engagement with gear teeth at a machining location and, after machining one or more workpieces of a workpiece batch, the grinding worm is re-profiled, thereby undergoing material removal and thus reducing the central pitch diameter of the grinding worm before it is used for additional machining, wherein during the re-profiling, a profiling member (30) is positioned relative to the worm thread orientation by means of the rotation axis (A), It is characterized in that the material removal takes place at a profiling location, in particular different from the machining location, wherein the metallic material (M) serving to bind the abrasive grains is removed.

2. The method according to claim 1, wherein The material removal is performed by performing a relative movement between the profile member and the grinding worm, said movement comprising at least two movement axes, in particular linear movement axes (X, Y).

3. The method according to claim 1 or 2, wherein: The grinding worm rotates / rotates about its axis during the material removal or in phases in which material removal is interrupted (B).

4. A method according to any one of the preceding claims, wherein The heat involved in the material removal is dissipated via a liquid, for which purpose in particular both the profiling member (30) and the worm region currently being re-profiled are immersed in a liquid bath.

5. A method according to any one of the preceding claims, wherein A calibration device is provided for retrieving a defined rotational angular position of the grinding worm in the profiling position in the profiling device, for example, in the form of a spindle which can only be clamped in a defined rotational position and supports the worm in a defined rotational position, or by means of a planar section area which is, for example, arranged axially behind the axial worm end and extends orthogonally to the radial direction on the worm rotation axis, and wherein, by means of the calibration device, the orientation of the worm thread in the re-profiling area can be set via the rotation axis in a predetermined direction (g) relative to a plane extending orthogonally to the worm rotation axis.

6. The method according to claim 5, wherein: The contoured member has a region under tensile stress along the predetermined direction, the region extending longitudinally along the direction.

7. A method according to any one of the preceding claims, wherein The continuously successive parts of the contoured component enter the material removal region in particular in a continuously successive manner.

8. A method according to any one of the preceding claims, wherein The material removal is performed by means of electrical discharge machining, in particular by means of wire erosion.

9. A hard finishing tool for use in a method according to any one of the preceding claims, the hard finishing tool being in the form of a grinding worm for generating grinding gears using geometrically undefined cutting edges.

10. A method for re-profiling a grinding worm according to claim 9, comprising the steps of material removal and relative positioning according to claim 1 and one or more steps of characterization, in particular according to claims 2 to 8.

11. A profiling device for profiling a grinding worm according to claim 9, comprising a positioning device (20) having a rotation axis (A) for relative positioning of the profiling member with respect to the orientation of the worm thread, and in particular a liquid-filled receiving space for receiving at least one area of ​​the grinding worm that is subjected to material removal and a grinding area of ​​the profiling member (30).

12. The profiling device according to claim 11, comprising means (10) for rotating the grinding worm about its own axis of rotation and an additional positioning system with at least two additional degrees of freedom of movement for the relative position between the grinding worm and the profiling member, wherein One degree of freedom has a translation component in a plane extending orthogonally to the worm's axis of rotation, and another additional degree of freedom has at least one directional component parallel to said worm's axis of rotation.

13. The profiling device according to claim 12 , comprising a controller which, in an operating mode with a positioned rotation axis and a positioned rotational position of the grinding worm, allows a relative movement along a zigzag path (s) involving the two additional degrees of freedom of movement and corresponding to the worm profile in axial section.

14. A profiling device according to any one of claims 11 to 13, wherein In the second operating mode, the control device of the profiling device causes the positioning (A0, B m ) and a superimposed movement (δA, δB, δX, δY) of a zigzag path (s) so as to subject the surface of the worm thread to a modification, said modification in particular modifying the profile angle modification, the profile convexity, the tooth top and / or the tooth root correction, so as to produce corresponding modifications on the generated workpiece during generating grinding with the grinding worm profiled in this modified manner, wherein the modification profiled to the grinding worm in particular comprises a coordinated superposition of these modifications and comprises a corrective compensation for the additional profiling and the resulting changed center pitch diameter.

15. Use of a profiling device according to any one of claims 11 to 14 for producing a grinding worm according to claim 9 by initial profiling thereof, wherein The grinding worm blank is machined by means of the profiled component and the grinding worm thread is thereby formed for the first time.

16. The method according to any one of claims 1 to 10, wherein During the re-profiling, a polygonal surface structure is produced in the circumferential direction of the generating grinding worm.

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