Method for setting up gear grinding process and gear grinding process
By using multi-stage quality control links in the gear grinding process to adjust the shaft movement and grinding tool shape of the grinding process, the problem of difficulty in ensuring the accuracy of the last grinding process in the prior art is solved, and higher tooth surface accuracy and quality control effect are achieved.
Patent Information
- Application Number
- JP2024179169
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-10-13
- Filing Date
- 2024-10-11
- Publication Date
- 2025-04-30
Smart Images
Figure 2025069090000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a method for setting up a gear grinding process and to a gear grinding process. [Background technology]
[0002] The processing of a ground gear typically involves multiple grinding strokes, for example using first one or more so-called roughing strokes performed with a large infeed, followed by at least one so-called finishing stroke performed with a smaller infeed.
[0003] Roughing is used initially with a large metal removal rate to quickly remove material to a specified tolerance, and finishing is used with a smaller metal removal rate to reproduce as accurately as possible the specified target geometry of the gearing on the gearing to be ground. To reduce processing time, the goal is to keep the total number of grinding strokes as low as possible.
[0004] Between grinding strokes, a change from synchronous to counter-rotating machining is frequently made to minimize the time required for tool repositioning. The change between synchronous and counter-rotating is synonymous with a change in the geometric stroke direction. To produce a good surface on the tooth flank, the final finishing stroke or all finishing strokes are often performed in counter-rotating. In addition to the depth of cut and machining direction, technological variables such as the feed rate and cutting speed, i.e. the respective speed of the grinding tool, often change from one grinding stroke to the next.
[0005] The applicant's research has revealed that the engagement conditions during machining are different for each grinding stroke. Depending on each grinding stroke, different displacement forces and excitations act on the grinding tool, which affect the grinding result and thus the tooth flank shape produced by the grinding stroke. For example, roughing strokes and finishing strokes performed before the final finishing stroke can affect the final tooth flank shape produced by the final finishing stroke.
[0006] Further investigation by the applicant has revealed that the grinding stroke performed immediately prior to the final grinding stroke (also referred to herein as the pre-final grinding stroke) may not produce the required tolerances for the final grinding stroke in a sufficiently uniform manner, e.g. due to a change in stroke direction before the final grinding stroke, and inaccuracies due to the pre-final grinding stroke may not be completely corrected in the subsequent final grinding stroke.
[0007] In other words, deviations from the pre-final roughing or finishing strokes can be reflected in the actual shape of the final manufactured gear ring. For example, displacement of the grinding tool on entry and exit during the pre-final grinding stroke can result in deviations due to the displacement being measurable in the final tooth flank shape.
[0008] Deviations from the desired gear shape or tooth flank form are usually corrected in a quality control loop, also called a "closed loop", where the final manufactured gear shape is measured and the deviations from the manufactured target shape are corrected by adjusting the axial movements for grinding the gear and for dressing the grinding tool. These adjustments to the axial movements are also called corrections. A closed loop is therefore a quality control loop that includes the repeated steps of "grinding", "measuring" and "correction".
[0009] The corrections are carried out in the same way for all grinding strokes, since they are determined based on the final deviation, i.e. the deviation between the actual shape of the gear ring to be produced and the final target shape that exists after the final grinding stroke. The corrected axial movements of the pre-final grinding stroke are therefore derived from the corrections of the final grinding stroke. This procedure has the disadvantage that certain negative effects of the pre-final grinding stroke on the final tooth flank shape can be reduced, but not completely eliminated.
[0010] Against this background, the invention is based on the technical problem of providing an improved method for setting up a gear grinding process and a gear grinding process, which in particular increases the accuracy of the final tooth flank form and allows more precise corrections.
[0011] According to a first aspect, the invention provides a method for setting up a gear grinding process comprising the following method steps: determining, by a first quality control loop, the axial movement and / or shape of the grinding tool for one grinding stroke or for several grinding strokes, by repeating the grinding, measuring and correcting steps against a pre-final target shape of the gear having a tolerance against the final target shape of the gear ring, where the grinding, measuring and correcting steps of the first quality control loop are repeated for one part or for several parts until the gear ring ground on each part or on each part achieves a predetermined accuracy against the final target shape; determining, by a second quality control loop, the axial movement and / or shape of the grinding tool for one grinding stroke or for several grinding strokes, by repeating the grinding, measuring and correcting steps of the second quality control loop, by repeating the grinding, measuring and correcting steps against the final target shape of the gear ring, where the grinding, measuring and correcting steps of the second quality control loop are repeated for one part or for several parts until the gear ring ground on each part or on each part achieves a predetermined accuracy against the final target shape.
[0012] The quality control loop according to the invention allows for a more accurate setting of the grinding process, where the final target shape of the gear ring is already corrected by another closed loop, i.e. the first quality control loop, thereby preventing, for example, deviations from the roughing stroke from being transmitted to the final tooth flank shape, since, as mentioned above, a conventional single closed loop may not be able to completely correct these deviations.
[0013] In other words, according to the invention, at least one preliminary step to the final target shape is already set and corrected by a separate quality control loop in order to improve the final machining result. In particular, this makes it possible to achieve the required tolerances for the final grinding stroke with greater precision than was possible with a conventional separate quality control loop. By using a first quality control loop to improve one or more pre-final grinding strokes, an improved "intermediate product" is already obtained in the form of a gear ring with more precise tolerances in the second quality control loop, which also includes the final grinding stroke.
[0014] According to the invention it is therefore also possible to speak of a multi-stage, in particular two-stage, or cascaded closed loop for setting the grinding process, in which individual grinding strokes or groups of grinding strokes are individually corrected and set by means of an assigned quality control loop.
[0015] A first quality control loop can be defined as relating to rough machining and a second quality control loop as relating to finish machining of the gear ring. In particular, each grinding stroke of the first quality control loop can have a greater metal removal rate than each grinding stroke of the second quality control loop.
[0016] When talking about a tolerance of the final preliminary target shape compared to the final target shape, this tolerance does not have to be constant across the entire tooth flank. For example, the center of the tooth flank may have a larger tolerance of the final preliminary target shape compared to the final target shape than the edge region of the tooth flank, or vice versa. However, the tolerance can be constant across the entire tooth flank. Preferably, the entire tooth flank of the final preliminary target shape has an allowance compared to the final target shape. However, individual regions, individual regions, or individual points of the final preliminary target shape may not have a tolerance to the final target shape.
[0017] The axial movements determined by the first quality control loop are determined from the uncorrected axial movements by assigning a correction to the uncorrected axial movements, the correction being calculated in a correction step of the first quality control loop based on a deviation of at least one ground gearing from a final pre-target shape determined in a measurement step of the first quality control loop.
[0018] The uncorrected axis movements are the axis movements that are initially provided by the gear and process design software. These are also called production data that are transferred by the gear and process design software to the grinding machine for gear grinding. Such software is, for example, sold by the applicant under the name "Gear Designer".
[0019] The uncorrected production data or the uncorrected axis movements are determined by the software for an ideal grinding process, i.e. the software assumes a grinding machine that operates without deviations and a tool that operates without deviations. Due to the tolerances of the drives, bearings and structures of the grinding machine, as well as the tools, operating the grinding machine using uncorrected production data will inevitably result in deviations of the manufactured actual shape from the final target shape.
[0020] The first quality control loop therefore gradually adapts the initially uncorrected axial movements transferred to the grinding machine to the relevant grinding machine and generates as accurately as possible the final target shape of the gear ring to be ground by correcting the axial movements.
[0021] Depending on the type and extent of the deviation to be corrected, the axis movements and / or the geometry of the grinding tool can be modified to reduce the measured deviation between the actual shape produced by the first quality control loop and the final target shape.
[0022] The shape of the grinding tool determined by the first quality control loop is determined from the uncorrected shape of the grinding tool by assigning a correction to the uncorrected shape of the grinding tool, the correction being calculated in a correction step of the first quality control loop based on the deviation of at least one ground gear ring from a final pre-target shape determined in a measurement step of the first quality control loop.
[0023] Here too, the first quality control loop corrects the initially uncorrected production data determined for a theoretically perfect process, in this case the geometry of the grinding tool, to the actual process, so that the deviations of the ground gear ring from the final target shape are as small as possible. If corrections are specified for the geometry of the grinding tool, these are taken into account by adjusting the dressing process accordingly.
[0024] The adjustment of the initially uncorrected production data by the above corrections can also be performed in a second quality control loop, with reference to the final target shape.
[0025] According to one design of the method, the axial movements determined by the second quality control loop are determined from the uncorrected axial movements by assigning a correction to the uncorrected axial movements, the correction being calculated in a correction step of the second quality control loop based on the deviation of the at least one ground gear ring from a final target shape determined in a measurement step of the second quality control loop.
[0026] Alternatively or additionally, the shape of the grinding tool determined by the second quality control loop is determined from an uncorrected shape of the grinding tool by assigning a correction to the uncorrected shape of the grinding tool, the correction being calculated in a correction step of the second quality control loop based on the deviation of the at least one ground gear ring from a final target shape determined in a measurement step of the second quality control loop.
[0027] If the uncorrected production data initially determined by the software, i.e. the uncorrected axis movements and / or the uncorrected geometry of the grinding tool, are adjusted by the corrections of the first quality control loop, this corrected production data can be used as starting values for the second quality control loop. This means that the second quality control loop can superimpose further corrections on the corrections of the first quality control loop. In other words, in this case the second quality control loop can be considered as a fine-tuning or adjustment of the corrections of the first quality control loop.
[0028] Thus, the axial movements and / or the shape of the grinding tool determined by the first quality control loop are used as input variables for a second quality control loop, a first grinding of the second quality control loop is first performed with the axial movements and / or the shape of the grinding tool determined by the first quality control loop, this shape of these axial movements and / or grinding tool is adapted by repeating the grinding, measuring and correcting steps of the second quality control loop against the final target shape of the gear ring, and the axial movements and / or the shape of the grinding tool of the second quality control loop are determined.
[0029] Further, the axial movements determined by the second quality control loop are determined from the axial movements of the first quality control loop by assigning a further correction to the axial movements of the first quality control loop, the further correction being calculated in a step of correcting the second quality control loop based on the deviation of the at least one ground gear ring from a final target shape determined in the step of measuring the second quality control loop.
[0030] Alternatively or additionally, the shape of the grinding tool determined by the second quality control loop is determined from the shape of the grinding tool of the first quality control loop by assigning a further correction or a correction of the first quality control loop to the shape of the grinding tool, the further correction being calculated in a step of correcting the second quality control loop based on the deviation of the at least one ground gear ring from the final target shape determined in the step of measuring the second quality control loop.
[0031] The number of required quality control loops can be defined for a particular grinding process depending on the individual case: for example, to ensure that the required tolerances of the gear ring are achieved, a grinding process may require the definition of several pre-final target shapes with a quality control loop assigned to each pre-final target shape.
[0032] The method may include additional quality control loops for additional grinding strokes.
[0033] Each grinding stroke can be assigned its own quality control loop, i.e., for setting up the grinding process, each grinding stroke can be assigned a separate quality control loop that is dedicated to that particular grinding stroke.
[0034] As already explained, the measured deviations can be corrected by the kinematics of the grinding process and / or the geometry of the grinding tool. At least one quality control loop therefore includes an adjustment of the tool geometry of the grinding tool by dressing. The terms "geometry of the grinding tool" and "tool geometry of the grinding tool" are used synonymously in this case.
[0035] The uncorrected production data may include uncorrected kinematics for dressing the grinding tool. The correction may include a correction to the kinematics of the dressing of the grinding tool. Thus, the kinematics of the dressing operation are corrected compared to the uncorrected kinematics of the dressing.
[0036] According to a second aspect, the present invention provides a method comprising the following method steps: grinding a gear ring, where one or more grinding strokes are performed and axial movements and / or a grinding tool geometry are used, which are determined by a first quality control loop of the inventive method for setting up a gear grinding method, and further grinding the gear ring, where one or more grinding strokes are performed and axial movements and / or a grinding tool geometry are used, which are determined by a second quality control loop of the inventive method for setting up a gear grinding method.
[0037] The modification of the first quality control loop and / or the modification of the second quality control loop may be adapted by performing the grinding, measuring and modifying steps on the ground gear ring and / or the further ground gear ring.
[0038] Even after the grinding process, i.e. the gear grinding process, has been set up, a first quality control loop and a second quality control loop can be performed to ensure specified quality or tolerance requirements during ongoing series production.
[0039] The grinding, i.e. gear grinding, can be continuous generation grinding with a grinding worm, in particular a dressable grinding worm.
[0040] The first quality control loop and / or the second quality control loop can determine an axial movement for dressing the grinding worm.
[0041] The grinding worm may include a first section with the shape of a grinding tool according to a first quality control loop, and the grinding worm may have a second section with the shape of a grinding tool according to a second quality control loop. Thus, one and the same grinding worm can be used for the grinding strokes of both the first and the second quality control loop. The sections required in each case can be shifted and set.
[0042] According to one design, the first and second sections of the grinding worm only differ in shape according to the first and second quality control loops, but have the same grinding material, i.e., grain size, particle material, porosity, and matrix material. The grinding worm can have multiple sections of different shapes for rough grinding and finish grinding.
[0043] The first section can be set for roughing to achieve a higher metal removal rate, and the second section can be set for finishing.
[0044] The first section can be set for rough machining and can be set to achieve a higher metal removal rate, e.g. a coarser grain size, while the second section can be set for finishing, e.g. a finer grain size. It is known that the grain size of the grinding worm as well as other parameters such as pore size, grain material, matrix material etc. affect the grinding speed and the suitability of the grinding worm for rough or finish machining.
[0045] The invention will now be explained in more detail with reference to the drawings which show exemplary embodiments, which are shown in a schematic manner in each case. [Brief description of the drawings]
[0046] [Figure 1] FIG. 1 shows a first quality control loop of the method for setting up a gear grinding process according to the invention. [Diagram 2] FIG. 2 shows a second quality control loop of the method for setting up a gear grinding process according to the invention. [Diagram 3] FIG. 3 shows a grinding worm. [Figure 4] FIG. 4 shows the components which mate with the grinding wheel of FIG.
[0047] First, in preparation method step 2, the gear ring 4, the grinding tool 6 for continuously generating the grinding of the gear ring 4, and the axis movements, i.e. the process kinematics required to manufacture the gear ring 4 by means of the grinding tool 6 are designed. The design may be software-based, for example using the "Gear Designer" software distributed by the Applicant (FIG. 1). The result of the design may collectively be referred to as production data.
[0048] The part to be ground from which the gear ring 4 is produced is, for example, a spur gear with straight teeth or a helical gear with helical teeth, produced by producing a grind using a grinding worm.
[0049] The gearing 4 designed using the software has a final target shape 8. The final target shape 8 is the final shape of the gearing 4 that will ultimately be manufactured within the specified tolerances using the gear grinding process according to the present invention.
[0050] The final target shape 8 is shown by way of example in a cross-sectional enlargement of two teeth 10 of the gear ring 4 in solid lines.
[0051] Furthermore, the gearing 4 designed using the software has a final target shape 12 having a tolerance 14 relative to the final target shape 8. The final target shape 12 is shown in dashed lines in an enlarged view as an example. In this case, the final target shape 12 represents an intermediate result of a gear grinding process comprising multiple grinding strokes to be achieved after one or more roughing strokes and before the performance of a finishing stroke.
[0052] According to an alternative exemplary embodiment, the tooth root can be free of tolerances and not ground, in which case a pre-gear ring can be provided, optionally with a protrusion, to avoid the formation of grinding notches in the tooth root.
[0053] The manufacturing data of the design according to method step 2 is transferred to the grinding machine 16. The manufacturing data includes uncorrected axis movements of the controlled axes X, Y, Z, A, B and C of the grinding machine 16.
[0054] Furthermore, the production data contains the uncorrected geometry of the grinding tool 17 used, so that firstly a gearing is produced on the first part 19 with uncorrected axis movements and with the uncorrected geometry of the grinding tool. This grinding of the gearing 23 on the first part 19 forms the first method step "Grinding" 18 of the first quality control loop Q1 of the method according to the invention for setting up a gear grinding method.
[0055] After the gear ring of the first part 19 has been ground, this part 19 is transferred to a first quality control loop Q1 in a second method step "Measurement" 20. For this purpose, the gear ring 23 of the part 19 is measured on a coordinate measuring machine 22 using a tactile measuring probe 24 or an optical measuring device 26.
[0056] Based on the measurements, the deviation between the actual shape of the ground gear ring and the initially produced final target shape 12 is determined and, in the third method step "Correction" 28 of the first quality control loop Q1, corrections 30 of the axis movements and / or the shape of the grinding tool are determined and transferred to the grinding machine 16.
[0057] The correction can be performed by software-based methods, for example, using the "Gear Corrector" software distributed by the applicant.
[0058] For example, if only a correction of the axis movements is required due to measured deviations between the actual manufactured shape and the final pre-target shape to be manufactured, the first quality control loop Q1 is executed again, starting from the "grinding" method step and performed using the corrected axis movements. According to an alternative exemplary embodiment, the correction may also include a correction of the shape of the grinding tool 17, if required by the measured deviations. In this case, the grinding tool 17 can be appropriately dressed before re-grinding.
[0059] Now, the method steps of "Grinding" 18, "Measurement" 20 and "Correction" 28 are repeated for one or more parts until the gear ring 23 ground on each part 19 achieves a predetermined accuracy or to a predetermined tolerance with respect to the final pre-target shape. If a correction is determined which maintains the specified accuracy or required tolerance of the gear ring, then the first quality control loop Q1 of the method for setting up a gear grinding process is completed and the correction of the rough machining stroke is known.
[0060] In the next method step, the above procedure is repeated for a second quality control loop Q2, which is used to optimize the finishing stroke of the gear grinding process to be set, taking into account the final target shape 8.
[0061] For this purpose, the axis movements and / or the shape of the grinding tool are determined again for a finishing stroke or multiple finishing strokes, i.e. by repeating the steps of "grinding", "measuring" and "correcting" with respect to the final target shape 8 of the gearing ring 4, and the steps of "grinding", "measuring" and "correcting" in the second quality control loop Q2 are repeated for the part or multiple parts until the respective part 19 or the gearing 23 ground on the respective part 19 achieves a predetermined accuracy with respect to the final target shape.
[0062] In this example, the axis movements and / or the shape of the grinding tool determined by the first quality control loop Q1 serve as input variables for the second quality control loop Q2, so that a first grinding in the second quality control loop Q2 is first performed using the axis movements and / or the shape of the grinding tool determined by the first quality control loop Q1, and this shape of these axis movements and / or grinding tool is adjusted to the final target shape of the gear ring by repeating the steps of "grinding", "measuring" and correcting in the second quality control loop Q2, thus determining the axis movements and / or the shape of the grinding tool in the second quality control loop Q2.
[0063] Therefore, the second quality control loop superimposes further corrections 32 on the corrections 30 of the first quality control loop, so as to enable the finishing stroke to produce the required final target shape 8 of the gear ring 4 as accurately as possible.
[0064] In order to modify the geometry of the grinding tool 17, the grinding tool 17 is dressed by the grinding machine 16, which here comprises control axes for dressing, i.e. the dressing axes B2 and C3, which perform the modified axial movements for dressing, and corresponding axes of the grinding machine 16 already mentioned above for controlling the movements of the grinding tool 17, i.e. the axes X, Y, Z, A, B.
[0065] According to an alternative exemplary embodiment, it may be provided that the quality control loops Q1 and Q2 are independent of each other and no corrections are transferred from the first quality control loop Q1 to the second quality control loop Q2, in which case both quality control loops Q1 and Q2 start from uncorrected manufacturing data of the design and corrections are determined independently of each other.
[0066] Once the first quality control loop Q1 and the second quality control loop have been completed and the rough machining corrections 30 and the finish machining corrections 32 have been determined, mass production can be carried out using the configured gear grinding process.
[0067] The following method steps are then carried out in the grinding machine 16: a gear grinding step, in which one or more grinding strokes are performed, using axial movements and / or the geometry of the grinding tool, which are determined by a first quality control loop Q1; and a gear further grinding step, in which one or more grinding strokes are performed, using axial movements and / or the geometry of the grinding tool, which are determined by a second quality control loop Q2. The grinding is a continuous generation grinding with a dressable grinding worm 17.
[0068] As illustrated in Figures 3 and 4, the grinding worm 17 may have a first section L1 having the shape of a grinding tool according to a first quality control loop Q1, and the grinding worm 17 may have a second section L2 having the shape of a grinding tool 17 according to a second quality control loop Q1.
[0069] The first section L1 can be used to rough-machine the gear ring 23 of the part 19 (FIG. 4). The second section L2 can be used to finish the gear ring 23 of the part 19. The list of reference numbers is the subject of the disclosure.
[0070] When modifications are mentioned in this text, the modifications may include, for example, changing the positions of the machine axes X, Y, Z, A, b, C, B2, C3, changing the path of movement, changing the speed, etc. For example, the position of the X axis specified as constant during grinding according to unmodified production data may be allowed to move during grinding, or to move along a curve with Z and X instead of a straight line. Similarly, modifications of one or more grinding strokes may include, for example, an adjusted infeed, an adjusted cutting speed, an adjusted grinding tool or workpiece rotation, a changed stroke speed, etc. Shift ratios may also be changed.
[0071] With regard to the geometry of the grinding tool, the modifications can have modified values of, for example, pressure angle, pitch, lead angle, etc., which are produced by a modified dressing operation on the grinding tool. [Explanation of symbols]
[0072] 2. Software-based gearing design 4 Gearing according to design 6 Grinding worm according to design 8 Final target shape according to design 10 Teeth 12 Final target shape based on design 14 Tolerance 16 Grinding machine / Gear grinding machine 17 Grinding tools / grinding worms 18 "Grinding" Method Steps 20 "Measurement" method steps 22 Coordinate Measuring Machine 24 Tactile measurement probe 26 Optical Measurement System 28 "Fix" Method Steps 30 Amendments 32 Further modifications 34 Dresser Q1 First quality control loop Q2 Second quality control loop X Machine axis Y Mechanical Axis Z machine axis A Machine Axis B Machine axis C Machine axis B2 Machine axis C3 mechanical axis Z1 Clamping Device
Claims
1. 1. A method for setting up a gear grinding process, comprising the following method steps: determining the axial movement and / or shape of the grinding tool (17) for one grinding stroke or for several grinding strokes by a first quality control loop (Q1) by repeating the steps of grinding (18), measuring (20) and correcting (28) for a final pre-target shape (12) of the gear ring (4) having a tolerance (14) for the final target shape (8) of the gear ring (4), wherein the steps of grinding (18), measuring (20) and correcting (28) of the first quality control loop (Q1) are repeated for one part or for several parts (19) until each part (19) or the gear ring ground on each part (19) achieves a predetermined accuracy with respect to the final pre-target shape (12); determining the axial movement and / or shape of the grinding tool (17) for one grinding stroke or for several grinding strokes by a second quality control loop (Q2) by repeating the steps of grinding (18), measuring (20) and correcting (28) for the final target shape (12) of the gear ring (4), in which the steps of grinding (18), measuring (20) and correcting (28) of the second quality control loop (Q2) are repeated for one part (19) or for several parts (19) until the shape (12) of the gear ring (4) desired on each part (19) is determined, and for one part (19) or for several parts (19) until the ground gear on each part (19) or on each part (19) achieves a predetermined accuracy with respect to the final target shape (8), method.
2. The axial movements determined by the first quality control loop (Q1) are determined from the uncorrected axial movements by assigning a correction (30) to the uncorrected axial movements, the correction (30) being calculated in a correction step (28) of the first quality control loop (Q1) based on the deviation of the at least one ground gear ring (23) from the final pre-target shape (12) determined in the measurement step (20) of the first quality control loop (Q1); and / or characterised in that the shape of the grinding tool (17) determined by the first quality control loop (Q1) is determined from an uncorrected shape of the grinding tool (6) by assigning a correction (30) to the uncorrected shape of the grinding tool (6), the correction (30) being calculated in a correction step (28) of the first quality control loop (Q1) on the basis of the deviation of at least one ground gear ring (23) from a final pre-target shape (12) determined in a measurement step (20) of the first quality control loop (Q1), The method of claim 1.
3. The axial movements determined by the second quality control loop (Q2) are determined from the uncorrected axial movements by assigning corrections to the uncorrected axial movements, the corrections being calculated in a correction step of the second quality control loop (Q2) based on deviations of the at least one ground gear ring (23) from a final target shape (8) determined in a measurement step (20) of the second quality control loop (Q2); and / or characterised in that the shape of the grinding tool determined by the second quality control loop (Q2) is determined from an uncorrected shape of the grinding tool by assigning a correction to the uncorrected shape of the grinding tool, the correction being calculated in a correction step (28) of the second quality control loop (Q2) on the basis of the deviation of at least one ground gear ring (23) from a final target shape (8) determined in a measurement step (20) of the second quality control loop (Q2). The method according to claim 1 or 2.
4. characterised in that the axial movements and / or the shape of the grinding tool determined by the first quality control loop (Q1) are used as input variables for a second quality control loop (Q2), a first grinding of the second quality control loop (Q2) is first carried out with the axial movements and / or the shape of the grinding tool determined by the first quality control loop (Q1), these axial movements and / or this shape of the grinding tool are adapted by repeating the grinding (18), measuring (20) and correcting (28) steps of the second quality control loop (Q2) to a final target shape (8) of the gear ring (4), and the axial movements and / or the shape of the grinding tool of the second quality control loop (Q2) are determined, The method according to claim 1 or claim 2.
5. the axial movements determined by the second quality control loop (Q2) are determined from the axial movements of the first quality control loop (Q1) by allocating further corrections (32) to the axial movements or corrections (30) of the first quality control loop (Q1), the further corrections (32) being calculated in a correction step (28) of the second quality control loop (Q2) on the basis of the deviations of the at least one ground gear ring (23) from the final target shape (8) determined in the measurement step (20) of the second quality control loop (Q2); and / or characterised in that the shape of the grinding tool determined by the second quality control loop (Q2) is determined from the shape of the grinding tool of the first quality control loop (Q1) by assigning further corrections (32) or corrections (30) of the first quality control loop (Q1) to the shape of the grinding tool of the first quality control loop (Q1), wherein the further corrections (32) are calculated in a correction step (28) of the second quality control loop (Q2) on the basis of deviations of at least one ground gear ring (23) from a final target shape (8) determined in a measurement step (20) of the second quality control loop (Q2). The method according to claims 2 and 4.
6. characterised in that further quality control loops are provided for further grinding strokes or a respective quality control loop is assigned to each grinding stroke. The method according to any one of claims 1 to 4.
7. characterised in that at least one quality control loop (Q1, Q2) adapts the tool geometry by dressing, The method according to any one of claims 1 to 6.
8. The method steps are as follows: - grinding the gear ring (23), performing one or more grinding strokes, using axial movements and / or a geometry of the grinding tool (17) determined by a first quality control loop (Q1) according to any one of claims 1 to 4; a further grinding step of the gear ring (23), performing one or more grinding strokes, using the axial movements and / or the geometry of the grinding tool (17) determined by the second quality control loop (Q2) according to any one of claims 1 to 4. method.
9. a correction (30) of the first quality control loop (Q1) and / or a correction (32) of the second quality control loop (Q2) is adapted by carrying out the steps of grinding (18), measuring (20) and correcting (28) on the ground gear ring (23) and / or on the further ground gear ring (23), The method according to claim 8 and any one of claims 2 to 5.
10. The grinding is a continuous generation grinding by a grinding worm (17), in particular a dressable grinding worm (17), The method according to any one of claims 1 to 4.
11. the first quality control loop (Q1) and / or the second quality control loop (Q2) determine the axial movements for dressing the grinding worm (17); The method of claim 10.
12. the grinding worm (17) comprises a first section (L1) having the shape of a grinding tool according to a first quality control loop (Q1), the grinding worm (17) comprises a second section (L2) having the shape of a grinding tool (17) according to a second quality control loop (Q1); The method according to claim 10 or claim 11.