Method for machining a toothing system - Patent application

Abstract

The invention relates to a method for machining a toothing system for a series of workpieces having the same target geometry, in which in a first machining operation a toothing system is manufactured or machined for each workpiece, and in a second machining operation, using a machining tool, the first machining, in particular the additional tooth shaping of the toothing system resulting from the chamfering of the tooth edges of this toothing system, is performed in a relative positioning to the workpieces, and a controller of the second machining operation at least partly automatically detects in particular changes in the workpiece characteristics independent of the first machining operation and / or changes in the settings of the first machining operation, in particular with respect to a respectively predetermined criterion, and performs the relative positioning as a function of the detected changes.

Description

[Technical Field]

[0001] The present invention relates to a method for machining a toothing system, in which, for a series of workpieces having the same target geometry, in a first machining operation a toothing system is manufactured or machined for each workpiece, and in a second machining operation, using a machining tool, additional tooth shaping of the toothing system resulting from the first machining, in particular the chamfering of the tooth edges of this toothing system, is carried out in a relative position to the workpieces. [Background technology]

[0002] Such methods are of course well known in the prior art, for example in the large-scale production of gear wheels, for example by hobbing with subsequent chamfering using a selected chamfering technique (which may for example be chamfer hobbing as disclosed in WO 2019 / 161942 A1) or other, in particular cutting-chamfering methods such as chamfer cutting (EP 1 495 824 B1), skiving chamfering (WO 2015 / 014448 A1), etc.

[0003] Typically, the machine controller and operator interface of modern toothing machines are already technologically mature, so that for a desired chamfer, the operator inputs the parameters characterizing the chamfer, such as the chamfer width and / or chamfer angle, into the controller, and the machine controller independently calculates the machine axis settings required for the chamfer for the second machining operation.

[0004] Workpiece batch processing of larger numbers of parts is typically performed only if the toothing system of the first machining operation is initially within the desired tolerance limits relative to the target toothing. Additionally, to monitor tolerance maintenance, the toothing system is typically measured at regular intervals. If the measurement describing the chamfer shape is found to be moving toward the tolerance limits—for example, the chamfer width is becoming too small—the operator can take corrective action and input a chamfer width that is larger than the target chamfer width by a certain amount instead of the actual target width. As a result, the process controlled by the "virtual oversized chamfer width" actually produces the desired chamfer as a countermeasure. Modern machine control systems are already technologically mature to a certain extent, requiring only a single measurement value from the measured chamfer to be input into the machine controller, which independently calculates the deviation from the predetermined target value and makes the necessary corrections.

[0005] However, despite all these monitoring and corrective measures, larger workpiece batches will always contain workpieces that do not correspond to the desired expectations regarding the additional tooth shaping that is performed and that fall outside the predetermined tolerance zone, especially if the tolerance zone is set narrowly.

[0006] The object of the present invention is therefore to improve a method of the type mentioned at the outset in such a way that the relative deviations of the individual results of the individual tooth formations of the workpieces of a workpiece batch relative to one another are reduced. Summary of the Invention

[0007] This object is achieved according to the invention by a development of the method of the initially mentioned type, which development is essentially characterized in that the controller of the second machining operation at least partly automatically detects changes in the workpiece characteristics, in particular independent of the first machining operation, and / or changes in the settings of the first machining operation, in particular relative to a respectively predetermined criterion, and performs relative positioning as a function of the detected changes.

[0008] Thus, the present invention recognizes that changes to the settings of the first machining operation, whether set by an operator or automatically adjusted as a result of changed factors in the first machining operation, can affect, for example, the position of the tooth edges of the toothing system, potentially resulting in larger deviations from the desired target chamfer geometry. The present invention allows these effects to be predicted and counteracted by at least partially automatically detecting the changes. Therefore, the additional tooth shaping, particularly the chamfer, is adaptive with respect to the changed factors in the first machining operation. The present invention can also take into account factors from machining operations preceding the first machining operation, i.e., the production of the workpiece blank, which is reflected in changes to workpiece characteristics. For example, as will be explained in more detail below, deviations can occur when the workpiece blank is turned, leading to changes in the clamping height in the additional tooth shaping.

[0009] The second machining operation is therefore performed as an at least partly automatic, adaptive additional tooth shaping in response to pre-machining changes in tooth edge position. As a reference the respective settings for the previous workpiece can be used, or the absolute value of the changed value can be compared with a predetermined absolute reference, or it can be a mixed form of both variants.

[0010] In a preferred method embodiment, the first machining operation is a soft machining operation, in particular hobbing, skiving or generating. A particularly preferred form of first machining operation is hobbing, although generating can also be used if necessary, although skiving is primarily preferred due to interference contours that hinder or prevent hobbing.

[0011] In a further preferred embodiment of the method, the second machining operation is a cut chamfer, and the target geometry in this respect has a predetermined chamfer shape and chamfer size. Compared to the still widely used roll pressure chamfering, the cut chamfering has the advantage of avoiding / reducing so-called secondary burrs.

[0012] In a further preferred embodiment of the method, the second machining is performed by a rolling method, in particular with hobbing intervention kinematics. In this respect, one-sided intervention is preferred. For preferred intervention kinematics, reference is made to the kinematics disclosed in WO 2019 / 161942 A1. However, other cutting methods are also considered, such as the skiving method disclosed in WO 2015 / 014448 A1 and the so-called "chamfer cutting" method described in EP 1 495 824 B1.

[0013] In a further preferred embodiment of the method, the detected change comprises a correction of the tooth lead of the toothing system, in particular a detected change in the form of a tooth lead angle correction of the first machining operation is recommended, since for example in the case of hobbing as the machining type of the first machining operation the latter is related to a tilt angle change and an axial distance change.

[0014] In a further preferred method embodiment, the detected change comprises a modification of the tooth thickness of the toothing system, the modification of the tooth thickness also being related to a change in the axial distance.

[0015] In a further preferred method embodiment, the alteration comprises a modification of the axial position of the tooth edges of the toothing system relative to the workpiece axis, which usually plays a secondary role in the manufacture of the toothing system, but not in the chamfering process or when manufacturing points where the type of clamping of the workpiece is changed to improve accessibility, as will be explained in more detail below.

[0016] According to a preferred embodiment, the clamping for the second machining operation is set up in such a way that the end face of the toothing system produced in the first machining operation is accessible to the chamfering tool and is not obstructed for reasons related to the clamping.

[0017] In a further preferred method embodiment, the change comprises a radial adjustment of the axial distance of the tool of the first machining operation / rotation axis of the first machining operation. Thus, detection of the change on the controller side can preferably be done at the level of the machine axis settings themselves, but also at the level of properties such as tooth trace profile and / or tooth thickness, which can be determined directly on the workpiece (see above).

[0018] In a further preferred method embodiment, the modification comprises a superposition of the swivel angle of the tool of the first toothing system and / or the machine axis of the first machining operation, e.g., the tangential axis (Y) or the axial axis (Z), and possibly an additional rotation (ΔC, ΔB), resulting in a tooth lead correction. If performed, the swivel angle modification is typically performed during hobbing or skiving. Depending on the realization of the machine axis of the first machining operation, machining point displacements due to the modification of the tangential axis and the additional rotation can also be taken into account.

[0019] In a further preferred method embodiment, measurements are made of the workpiece prior to the second machining operation regarding changes affecting the clamping height, and the results are accessed by the controller. In particular, if the workpiece raw part is supplied with a larger tolerance zone, or if there are deviations occurring when the workpiece is finished that are not related to the first machining operation itself, even deviations within the tolerance zone can result in a displacement of the clamping height for the second machining operation, which, when combined with deviations within the tolerance zone of the first machining operation, can result in deviations of the machining result outside the tolerance zone of the second machining operation. In a preferred method embodiment, during measurement, the clamping height of one or both cross sections of the toothing system produced in the first machining operation is monitored during clamping for the second machining operation, and the controller automatically gains access to, in particular, the actual clamping height or deviation of the workpiece from the target clamping height. For example, the axial distance of a known position of the sensor plane from the plane (chamfer plane) of the upper flat area of ​​the toothing system is determined by the sensor. The measurement variable that determines the deviation from the target clamp height (e.g., b u The determination of the workpiece position (see bottom of Figure 2) can be made already before clamping for the second machining operation. Preferably, it is made in parallel with the main time of the first machining operation, for example during workpiece automation that moves the workpiece to the first machining operation. When the workpiece is tracked, the measured variables can be assigned to the workpiece and stored in the controller.

[0020] In a further preferred embodiment of the method, it is provided that before the second machining operation on a workpiece, no check of the machining result of the second machining operation is performed on the preceding workpiece or on one of the last n preceding workpieces, n being preferably at least 5, in particular at least 10. Although the clamping height changes described above are independent of the machining result of the first machining operation, also in the method according to the invention a random check of the overall machining result can be performed. However, according to the invention, continuous monitoring of the overall result is not necessary as a result of the detection of a change.

[0021] In a further preferred method embodiment, during the detection, at least one change is determined from the changed machine axis settings of the first machining operation without relying on specific measurements on the workpiece. In this connection, due to the detected change, a change in relative positioning can be made for at least a proportion of the series of machined workpieces, in particular more than 30%, preferably more than 50%, and the detection does not trace back to specific measurements detected on the workpiece, in particular the machining result of the first machining operation.

[0022] In a further preferred method embodiment, the controller is designed for a basic setting for performing the second machining operation according to input of the target geometry and parameters of the machining tool and, if applicable, clamping parameters, so that the operator can still input the desired chamfering parameters for the second machining operation in advance.

[0023] In a preferred embodiment of the method, when a change is detected, the default control parameters are changed, rather than the input parameters. In principle, the machine controller can calculate the changes programmed by an experienced operator in the prior art and make them available to the operator for input. However, this is not required. In this regard, the input parameters can remain at target values, and the changes in relative positioning are aimed at maintaining the target parameters as inputs by responding at least partially, and in particular fully automatically, to the detected changes. Therefore, the at least partially automatic detection of changes in workpiece characteristics and / or factors of the first machining operation compared to the respective predetermined criteria is preferably fully automatic.

[0024] In a further preferred embodiment, the at least partially automatic detection includes semi-automatic application insofar as the machine operator is prompted by the machine controller to display the changes detected by the machine controller and the relative repositioning calculated therefrom, allowing the machine operator to confirm or discard the repositioning.

[0025] This is explained using the following scenario: If the machine operator makes a compensation in the machine's compensation dialogue based on the manufactured and measured tilt angle for the first machining operation, the chamfer will be set for this toothing system already manufactured by compensation during the first machining operation, e.g., hobbing, and the machine operator confirms the corresponding repositioning. The same applies for example to fine-tuning compensations set during the first machining operation after further workpiece measurements, or to target compensations after a few machining operations in a de facto new tool state.

[0026] If tool wear occurs after a larger number of parts, which leads to an unnoticed change in the manufactured tilt angle, and if corrections in this regard for the first machining operation only warrant countermeasures for wear compensation that re-establish the tilt angle profile expected from the second machining operation, the current relative positioning used for the second machining operation will fit here, and the machine operator will therefore discard any possible repositioning that is displayed to the machine operator as a result of automatic machining.

[0027] In a particularly preferred embodiment, where clamp height monitoring is implemented, repositioning due to changes in this regard is performed fully automatically, but in any case, after process setup for a series of production batches has been completed, the machine controller, responsive to changes in the settings of the first machining operation, operates semi-automatically with respect to performing repositioning in this regard.

[0028] The invention also relates to a control program which, when executed on a denting machine, controls the machine to carry out a method according to one of the above aspects, and to a denting machine controlled to carry out the method.

[0029] In the case of this toothing machine, the second machining operation can be performed on the toothing machine itself, on a machining station assigned to the toothing machine, or via a machining station automatically coupled to the toothing machine, but can also be performed on an entirely separate machine. Nevertheless, in order to couple the controller of the first machining operation and the controller of the second machining operation, it is ensured that the factors of the first machining operation compared to the respective criteria are detected and can be accessed by the controller of the second machining operation.

[0030] In a preferred embodiment, the machining unit performing the second machining operation has means for sensor-based detection of the tooth gap center and / or clamping height in the cross section in which the tooth edge to be chamfered is located (if the end face of the toothing system is not perpendicular to the rotation axis of the toothing system, the clamping height of the axial position of the tooth tip can be used, for example, as a reference on the workpiece for the clamping height).

[0031] The information required for the clamping height can be derived, for example, via the axial distance of the end face of the toothing system from the plane of the sensor. [Brief explanation of the drawings]

[0032] In the following, the invention will be further explained with reference to embodiments that are described with reference to the accompanying drawings. [Figure 1] FIG. 1 is a diagram for explaining process design parameters. [Figure 2] 1 shows a diagram of a workpiece raw part. [Figure 3] 1 shows a schematic diagram of an additional rotation in the case of an axial displacement of the toothing system. [Figure 4] 10 is a schematic diagram of tooth edge positions at different edge heights. FIG. [Figure 5] FIG. 10 is a diagram showing tooth edge positions for different tooth thicknesses. [Figure 6] FIG. 10 is a schematic diagram of the tooth edge position in the case of tooth trace correction. [Figure 7] FIG. 1 is a schematic diagram of the position of a tooth edge when multiple influences are superimposed. DETAILED DESCRIPTION OF THE INVENTION

[0033] First, with reference to Figure 1, some parameters on which the process design is based will be explained using the example of a cylindrical-helical toothing system. The process design is essentially based on a gear wheel or toothing system in which all dimensions are exactly nominal. The parameters considered are usually the number of teeth z, the normal module m n , normal intervention angle α n, the inclination angle β at the pitch circle, the profile displacement xm, the tip circle diameter da2, the root circle diameter df2, and the face width b. In Figure 1, the diameter at the pitch circle is indicated by d, and the inclination angle β is related to the tooth flank, which as a result of the helical toothing is further displaced on the pitch circle cylinder relative to an axis parallel to the axis of rotation, which axis of rotation is indicated by u in Figure 1.

[0034] 2, a typical blank 40 is first shown in a perspective view in FIG. 2a. In various applications, this blank 40 may have an annular cylindrical outer region 43 from which the subsequent toothing system is produced, as well as a disk-shaped body 41 pierced by a through hole 42 and arranged in a plane perpendicular to the rotation axis of the toothing system. The outer ends (as viewed axially) in the form of upper and lower end faces 433, 434 of the outer annular body 43, which extends axially over the gear width b, may be spaced apart from the end face of the inner annular body 41. In FIG. 2b, this distance is b o (width of the turned recess at the top) and b u (width of the turned recess at the bottom). When hobbing a toothing system from a workpiece blank 40, the blank is placed on the outer annular body 43, more precisely, for example, on the lower end face 434. On the other hand, if, for example, during chamfering performed with separate clamps, the tooth edges are chamfered on both end faces of the workpiece toothing system without changing the intermediate clamp, the workpiece is attached via the lower end face 412 of the inner disk body 41.

[0035] Also, from Fig. 2b, when the raw part is turned, b o and / or b u It can be seen that manufacturing related deviations due to variations in φ can result in variations in the position of surfaces 434 and 433 relative to surface 412.

[0036] While such manufacturing tolerances are usually irrelevant when hobbing a toothed system, even when supporting on the end face 434, the situation is different when clamping with support on the end face 412, since the axial machining path during hobbing is set to the maximum face width in any case. This is because the planes of the upper end face 433 and the lower end face 434 are positioned in a different relative position during turning, depending on manufacturing tolerances, compared to the direct support on which the support face 412 rests. Typically, the reference position is not the direct support of the support face 412, but a machine reference, for example, the height of the machine table including the clamping means. Therefore, there may be deviations in the axial position of the planes of the upper end face 433 and the lower end face 434 relative to the target position, compared to the "clamping height" h specified on the machine side. The term "height" in the terminology selection refers to the extension in the rotational direction of the workpiece, and it goes without saying that not only vertical machines but also horizontal machines or machines with oblique axes can be used.

[0037] When the tooth edges of the toothing system are to be chamfered, the position of the tooth relative to the table axis is first determined by the sensor, and therefore also the tooth edges to be machined on the upper end face 433 and the lower end face 434. Using knowledge of the axial distance of, for example, the upper end face of the toothing system relative to the plane of the sensor, the toothing system can be positioned so that the tooth edges on the upper end face 433 can be rotated to the desired position, as viewed axially, for example via the machine table axis, and similarly for the chamfer on the lower end face 434.

[0038] In the case of a straight toothing system, it is sufficient to simply set the desired machining position via axial movement to set the plane of the upper end face 433 or lower end face 434, but in the case of a helical toothing system, the workpiece must be further rotated to hold the tooth space at the desired chamfer height at the machine center.

[0039] For axial correction ΔZ, this is ΔC=ΔZ×360° / p Z This results in the required additional rotation of p Zis the pitch height of the helical toothing system (the tooth spaces follow a helical line with the pitch height), and z × m n ×π / sin|β|. When the table is rotated clockwise, ΔC has the same sign as the axis misalignment for a right tilt β, and ΔC has the opposite sign for a left tilt β. The opposite sign convention applies when the table is rotated counterclockwise (rotation about the workpiece axis C).

[0040] This additional rotation with axial displacement is again shown diagrammatically in FIG. 3, together with the position sensor 8 and the machined surfaces 5, 6 on which the tooth edges are located.

[0041] Regarding the relative position of the chamfering tool with respect to the planes of the end faces 433 and 434, it is possible to use, for example, the swivel angle η, the axial distance ΔX, the distance to the machine center ΔY, and four times the distance ΔZ to the chamfering plane, i.e. (η3, ΔX3, ΔY3, ΔZ3) for the plane of the upper end face 433, and therefore (η4, ΔX4, ΔY4, ΔZ4) for the lower face of the end face 434.

[0042] For the absolute machine position of the chamfering tool, the relative position values ​​can be used for the swivel angle, axial distance, and distance to the machine center, but for the distance to the chamfering plane, in addition to the rotation ΔC3 or ΔC4, Z3 = hb relative to the upper plane u +b+ΔZ3 and Z4=hb u The axial value of -ΔZ4 must be taken into account.

[0043] Figure 4 again shows the situation of the tooth edge position when the edges are at different heights. The nominal dimension of the gear width b is the minimum gear width b min and maximum gear width b max The position of the sharp edge on the left side at the nominal face width is indicated by B, and the position of the blunt edge on the right side is indicated by E. The larger the face width (b max), these positions are indicated by C or F, and for smaller face widths by A and D. It can thus be seen how manufacturing-related deviations when the raw part is turned can lead to different positions of the tooth edges at the resulting different heights of the edges, i.e. positional changes can be taken into account during a subsequent machining (second machining), for example chamfering, which are independent of the preceding toothing system manufacturing itself and can therefore occur even if the machining of the toothing system is carried out ideally at 100% relative to the nominal dimension manufacturing.

[0044] However, variations in the position of the tooth edges also result from variations resulting from toothing manufacturing, such as tooth thickness. This is shown in Figure 5, where B and E indicate the positions of the sharp edge on the left side and the blunt edge on the right side, respectively, at the nominal tooth thickness, which are displaced to G, K for thinner teeth or H, J for thicker teeth in the case of thinner teeth in a plane perpendicular to the workpiece rotation axis.

[0045] As another example, Figure 6 shows the tooth trace correction f that occurred during tooth manufacturing. Hβ As can be seen from Figure 6, the nominal positions B and E change to positions L and N in the case of modification β-, and to positions M and P in the case of modification β+. β ) changes, the positions of the reference positions B and E do not change.

[0046] FIG. 7 shows the superposition of the effects of some of the variations described with reference to FIGS.

[0047] Again, b denotes the sharp edge of the left flank at the nominal position, and E denotes the blunt edge of the right flank at the nominal position, with the associated profile W of the tooth space center at the inclination angle β at the nominal dimensions. In contrast, the profile V of the tooth space center resulting from the inclination angle β correlates with the position U resulting from the sharp position of the left flank and the position Z resulting from the blunt edge of the right flank, and the axial distance between the top surface 433 according to the nominal dimensions and the top surface 3″ at the height of U, Z is ΔZ. o is shown by

[0048] When toothing corrections are made for the hobbing example compared to the nominal values, the axial distance and inclination angle change. Thus, the tooth thickness correction results in a constant axial distance change ΔX1, while the tooth trace angle correction has a contribution to the axial distance change ΔX2(Z), which also depends on the axial position Z, as well as an inclination angle change Δβ.

[0049] In contrast, the following changes must be taken into account during chamfering: the tilt angle change results in a pitch height change Δpz, which, as mentioned above, results in an additional rotation ΔC pz , resulting in a height difference Δz0 between the top end faces 433 and 3″ in FIG. 7, and an additional rotation ΔC0 associated with the transition from end face 433 to end face 3″.

[0050] Therefore, the relative positioning as a function of the detected changes is performed relative to the end position of the absolute machine position of the chamfering tool from plane 433 to 3″, so that the same pivot angle is assumed (η 3’’ =η3). The axial distance is X 3’’ =ΔX3+ΔX1+ΔX2(Z), the distance to the machine center can remain the same, and the distance to the chamfered surface is Z3=hb u +b+ΔZ3+ΔZ0, and for rotation, ΔC3+ΔC pz +ΔC0. The index “3” here represents the surface 433.

[0051] As already explained above, the last mentioned contribution ΔC serves the purpose of rotating the tooth space of the workpiece at the height of the chamfer plane to the machine center by the rotation of the workpiece, the rotation from the sensor plane to the original plane ΔC3, and the additional rotation ΔC when the tilt angle changes. pz , and an additional rotation ΔC0 that accounts for the transition from plane 433 to plane 3″.

[0052] The above description relates primarily to the upper surface 433. A corresponding procedure is used for the lower surface 434.

[0053] Of course, deviations from exact calculations are possible and approximations, estimates and / or coarser corrections, for example by means of correction tables, may also be used, and the above representation represents only one possible realization.

[0054] To achieve the relative position, it is possible to reposition the machine axes on the workpiece side instead of the machine axes of the chamfering tool with respect to the individual axes, which results in a relative positioning that is the same as the determined absolute positioning of the chamfering tool.

[0055] Similar to tooth production of the first machining operation by hobbing, skiving or generating, it can also be used and can be used as a basis for variations in the first machining operation resulting in axial distance variations and / or tilt angle variations.

[0056] In this respect, the invention is not limited to the methods set forth in the exemplary embodiments, but rather the features of the following claims and the above description may, or in combination, be essential to realizing the invention in its various embodiments.

Claims

1. 1. A method for machining teeth, comprising: For a series of workpieces having the same target geometry, a first machining operation, by means of a first machining tool having a rotation axis, to manufacture or machine teeth in a workpiece having a respective rotation axis; a second machining operation using a second machining tool having a rotary axis to form additional teeth on the teeth in a position relative to the workpiece; In the second machining operation: The controller at least partially automatically detecting changes in the characteristics of the workpiece before and / or after the first machining operation, changes in the setting position of a rotary axis of a first machining tool of the first machining operation, and / or the position of a machine axis of a first machining tool after the first machining operation; and the controller performs the relative positioning based on the detected change; the workpiece characteristic is a tooth trace of the tooth, a tooth thickness of the tooth, or an axial position of the tooth edge of the tooth relative to a workpiece axis; 10. The method of claim 9, wherein additional tooth shaping of the teeth includes cutting a tooth edge of the teeth to create a chamfer.

2. The method of claim 1 , wherein the first machining operation is hobbing, skiving, or generating.

3. A method as described in claim 1 or 2, wherein the target geometric shape has a predetermined chamfer shape and chamfer size.

4. 3. The method of claim 1 or claim 2, wherein the second machining operation is performed by a rolling process.

5. A method according to any one of claims 1 to 4, wherein when the characteristic of the workpiece is the tooth ridge of the tooth, the change includes modifying the tooth ridge of the tooth.

6. A method described in any one of claims 1 to 5, wherein when the characteristic of the workpiece is the tooth thickness of the teeth, the change includes modifying the tooth thickness of the teeth.

7. A method described in any one of claims 1 to 6, wherein when the characteristic of the workpiece is the axial position of the tooth end edge of the tooth relative to the workpiece axis, the change includes modifying the axial position of the tooth end edge of the tooth relative to the workpiece axis.

8. The method of any one of claims 1 to 7, wherein the modification comprises a radial adjustment of the first machining tool of the first machining operation.

9. 9. The method according to claim 1, wherein the alteration comprises a swivel angle of the first machining tool of the first machining operation and / or an overlap of a machine axis of the first machining operation, resulting in a tooth lead modification.

10. A method according to any one of the preceding claims, wherein prior to the second machining operation, measurements are made on the workpiece, the results of which are accessed by the controller.

11. The method according to any one of the preceding claims, wherein the second machining operation of a workpiece is not preceded by a check of the machining result of the second machining operation of one of the preceding workpieces.

12. 10. The method according to claim 8 or 9, wherein during said detection, said changes are determined from changes in machine axis settings of said first machining operation without recourse to specific measurements on said workpiece.

13. The method according to any one of claims 1 to 12, wherein in the second machining operation, the controller performs basic settings for performing the second machining operation according to input of the target geometric shape and parameters of the machining tool, and input of clamping parameters.

14. 14. The method of claim 13, wherein when a change is detected, the control parameters of the preferences are changed rather than the input parameters, and the control parameters of the preferences differ from the input parameters.

15. A control program which, when executed on a controller of a denting machine, controls the machine to perform a method according to any one of claims 1 to 14.

16. 16. A tooth-forming machine for performing a first machining operation on a workpiece to produce teeth and for performing additional tooth shaping on said workpiece by means of a second machining operation, characterized in that the tooth-forming machine has a controller designed to perform the method according to any one of claims 1 to 14 and / or a control program according to claim 15.

17. The method of claim 1 , wherein the second machining operation is performed with the intervention kinematics of hobbing.

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