DE102018115401A1 - METHOD FOR FINISHING BEVEL WORKPIECES - Google Patents

Abstract

Method for reworking the tooth flanks of an already toothed, hardened bevel gear workpiece (20) with an offset tool (10), which has abrasive teeth with non-conjugated, spherical tooth flanks, with the steps (in any order): • Rotary drive of the tool (10) around a tool spindle axis (A1) and / or driving the bevel gear workpiece (20) rotationally about a workpiece spindle axis (B), • executing a synchronized, NC-controlled feed movement of the tool (10) relative to the bevel gear workpiece ( 20) in order to engage the teeth of the tool (10) with tooth gaps of the bevel gear workpiece (20), • performing ◯ a rolling movement of the tool (10) relative to the bevel gear workpiece (20), and ◯ one superimposed on it , NC-controlled relative movement of the tool (10) relative to the bevel gear workpiece (20), this relative movement being carried out in such a way that an area of the crowned tooth flanks along the tooth flanks (21) of the bevel gear workpiece (20) are shifted in a controlled manner in such a way that a locally limited machining area (23) which moves along the tooth flanks (21) results.

Description

The present invention relates to a method for reworking bevel gear workpieces.

State of the art

It is known that a bevel gear can be toothed by rolling machining with a gear cutting tool. The rolling process required for machining involves superimposing several relative movements. Details can be found on the pages 76 - 77 and the .5 of the book “Bevel Gears; Basics, Applications ”, J. Klingelnberg, Springer-Verlag, 2008.

The .5 of the book mentioned is here as 1 shown. In order to be able to describe the manufacturing kinematics of rolling machining, a virtual face wheel is used PR defined as the generation wheel. You can in 1 realize that the face wheel PR is a flat, infinitely thin, ring-shaped structure. The manufacturing kinematics can be described mathematically in that the bevel gear workpiece 2 (here a pinion) with the face wheel PR circulated. The gear cutting tool 1 (here in the form of a knife head with several knives) does not roll with the face wheel PR , but the cutting edges (here the knife edges of the bar knives) place where they are with the bevel gear workpiece 2 one tooth (in the single part process) or several teeth (in the continuous process) of the face gear come into contact P The bevel gear workpiece 2 itself then rolls in a gear with mostly a counter gear and this rolling has a different transmission ratio than the rolling with the bevel gear workpiece 2 with the face wheel P , Such a face gear can therefore also have a non-integer number of teeth.

In the 1 is next to the gear cutting tool 1 and the bevel gear workpiece 2 also the virtual face wheel PR shown in mutual engagement. The resulting movement process involves rotation of the gear cutting tool 1 around a tool spindle axis A1 (to create a cutting motion) and pivoting or rotating about a roller cradle axis W1 (called rolling here), which coincides with the face wheel axis. Swiveling or rotating around the roller cradle axis W1 is mostly defined by a range of cradle angles. There is also a rotational movement of the bevel gear workpiece 2 around a workpiece spindle axis B added.

There are also bevel gear pairs in which the ring gear is only immersed (i.e. there is no rolling with the generator wheel) and the pinion is rolled. In this case, the generator wheel is not a face wheel, but the ring gear (i.e. a conical generator wheel). The tool then represents this conical generator wheel.

The manufacturing kinematics based on the 1 described, can also be applied to other tools, such as grinding tools.

For reworking (also called hard fine machining) an already toothed bevel gear workpiece 2 For example, a honing tool can be used. Honing can be the last machining step in gear manufacturing.

Gear honing uses a honing tool that is in the form of a gearwheel with the bevel gear workpiece to be honed 2 can be paired. The teeth of the honing tool have a flank shape that is conjugated to the flank shape of the teeth of the bevel gear workpiece 2 , In this sense, a conjugated tooth is the exact “conjugation” of the flanks of this tooth with the tooth gap on the bevel gear workpiece 2 , The tooth flank of the bevel gear workpiece 2 and the conjugated tooth flank of the honing tool has the same tangential planes and the same normals along the entire flank.

In general it can be said that a surface is conjugated to another surface if the surface is part of the envelope of the other surface. Two surfaces are conjugate to each other if they are part of the envelope of the other surface. If the envelope is generated by a movement with a free parameter (e.g. tool rotation around a tool spindle axis), there is line contact between the two surfaces at any time during the movement of conjugated surfaces. This statement refers to a no-load condition. Gear honing with a conjugated honing tool results in surface pressure under load. Therefore, the line contact becomes a flat contact.

By the number of teeth ratio of the number of teeth of the honing tool to the number of teeth of the bevel gear workpiece 2 , which corresponds to the transmission ratio, and by the axis arrangement in three dimensions In conventional honing, space is defined by a spatial screw gear, which on the one hand is the bevel gear workpiece 2 and on the other hand includes the conjugated honing tool.

In 2 is the radial projection of a tooth flank 3 (shown in gray) of a tooth of a bevel gear workpiece 2 (here a ring gear). In the lower area is a cut surface through the foot area 4 to recognize the tooth gap. in the area of the tooth flank 3 the contact pattern is shown in schematic form, which results when the tooth flank 3 is processed with a conjugated honing tool. You can see a bevy of lines of contact BL and a line that runs transversely to it and that defines the path of contact KP shows.

It is therefore the object of the invention to provide a method which enables high-precision and tolerance-based reworking of pre-toothed and hardened bevel gear workpieces. Post-processing should be efficient and reproducible.

The objects are achieved according to the invention by a method according to claim 1. Advantageous embodiments of the invention form the subject of the dependent claims.

• • Drehantreiben des Werkzeugs um eine Werkzeugspindelachse und/oder Drehantreiben des Kegelrad-Werkstücks um eine Werkstückspindelachse,
• • Ausführen einer synchronisierten, NC-gesteuerten Zustellbewegung des Werkzeugs relativ zu dem Kegelrad-Werkstück, um die Zähne des Werkzeugs mit Zahnlücken des Kegelrad-Werkstücks in Eingriff zu bringen,
• • Ausführen
  • ◯ einer Wälzbewegung des Werkzeugs relativ zu dem Kegelrad-Werkstück, und
  • ◯ einer dazu überlagerten, NC-gesteuerten Relativbewegung des Werkzeugs relativ zu dem Kegelrad-Werkstück, wobei diese Relativbewegung so ausgeführt wird, dass ein Bereich der ballig geformten Zahnflanken entlang der Zahnflanken des Kegelrad-Werkstücks so kontrolliert verlagert wird, dass sich ein lokal begrenzter, sich entlang der Zahnflanken verschiebender Bearbeitungsbereich ergibt.

According to the invention, this object is achieved by a method for reworking the tooth flanks of an already toothed, hardened bevel gear workpiece with an offset tool which has abrasive teeth with non-conjugated, spherically shaped tooth flanks. The procedure comprises at least the following steps, which do not necessarily have to be carried out in the order specified:

• Driving the tool around a tool spindle axis and / or driving the bevel gear workpiece around a workpiece spindle axis,
• • Execute a synchronized, NC controlled feed movement of the tool relative to the bevel gear workpiece in order to engage the teeth of the tool with tooth gaps of the bevel gear workpiece,
• • To run
  • ◯ a rolling movement of the tool relative to the bevel gear workpiece, and
  • ◯ one superimposed, NC -controlled relative movement of the tool relative to the bevel gear workpiece, this relative movement being carried out in such a way that a region of the spherical tooth flanks along the tooth flanks of the bevel gear workpiece is displaced in a controlled manner in such a way that a locally limited machining region that moves along the tooth flanks is shifted results.

It is about a process that works with a tool that has geometrically undefined cutting edges. This means that the tool used here has no geometrically defined cutting edges. It is therefore a process that is in principle comparable to honing. Therefore, for the sake of simplicity, there is also talk of a honing tool, although the tool of the invention differs from the classic honing tool in that it has non-conjugated flanks. In addition, the method of the invention differs from classic honing in that, in addition to the engagement of the workpiece and the tool, a superimposed, NC -controlled relative movement is carried out. The process is therefore also referred to here as path honing or path-controlled honing.

A non-conjugated flank is a flank that is non-conjugated in relation to the nominal geometry of the tooth flanks of the bevel gear workpiece.

The NC-controlled relative movement is carried out because the machining area covers only a partial area of the tooth flank of the bevel gear workpiece to be reworked. By running the NC -controlled relative movement, this machining area is shifted along the tooth flank, and this results in an effective machining area that covers a larger partial area of the tooth flank of the bevel gear workpiece.

In at least part of the embodiments, the NC -controlled relative movement executed in such a way that a coherent surface results as an effective machining area, which covers at least 50% of the total surface of the tooth flank.

It is an advantage of the method of the invention that it creates an undirected but very high quality surface structure on the tooth flanks of the bevel gear workpiece and that it does not produce a grinding burn.

In at least part of the embodiments, the tool has a conical base body with teeth that are non-conjugated with respect to the teeth of the bevel gear workpiece to be reworked.

In at least some of the embodiments, the tool has tooth flanks that are crowned in the longitudinal direction of the flank and / or in the direction of the flank height.

The relative movement of the tool relative to the bevel gear workpiece is preferably carried out in such a way that there is no edge bearing with the edges of the non-conjugated, spherically shaped tooth flanks of the abrasive teeth. Finishing is done primarily with the abrasive, non-conjugated, spherical tooth flanks of the tool.

In at least part of the embodiments, the NC -controlled relative movement carried out as a uniform relative movement, ie this relative movement is neither an oscillatory movement nor a movement that results from an eccentricity.

A uniform relative movement is in particular a movement that NC -controlled follows a given path (eg defined by one or more vectors). The movement following a given path can have a substantially constant speed. However, a speed profile can also be specified, for example.

With the method of the invention, particularly good surface properties can be achieved if the bevel gear workpiece is ground after hardening and before the reworking according to the invention.

The method of the invention is particularly suitable for fine-machining the bevel gears of high-quality gearboxes that meet high geometric requirements, have high strength properties and have low noise emissions.

list of figures

• 1 zeigt eine schematische Illustration eines virtuellen Planrades einer Kegelrad-Verzahnmaschine zusammen mit einem Kegelrad-Werkstück und einem Verzahnungswerkzeug;
• 2 zeigt eine schematische Illustration der Radialprojektion der Zahnflanke eines Kegelrad-Werkstücks (hier ein Tellerrad), das mit einem konjugierten Honwerkzeug des Standes der Technik nachbearbeitet wurde;
• 3 zeigt eine schematische Perspektivdarstellung einer Konstellation aus Kegelrad-Werkstück und achsversetzt angeordnetem Werkzeug mit nicht-konjugierten Zähnen;
• 4A zeigt eine schematische Radialprojektion der Zahnflanke eines Kegelrad-Werkstücks (hier ein Tellerrad), die in einer ersten Relativlage mit einem nicht-konjugierten Werkzeug nachbearbeitet wurde;
• 4B zeigt eine schematische Radialprojektion der Zahnflanke der 4A, die in einer zweiten Relativlage mit dem nicht-konjugierten Werkzeug nachbearbeitet wurde;
• 4C zeigt eine schematische Radialprojektion der Zahnflanke der 4A, die in einer dritten Relativlage mit dem nicht-konjugierten Werkzeug nachbearbeitet wurde;
• 4D zeigt eine schematische Radialprojektion der Zahnflanke der 4A, die in einer vierten Relativlage mit dem nicht-konjugierten Werkzeug nachbearbeitet wurde;
• 4E zeigt eine schematische Radialprojektion der Zahnflanke der 4A, die in einer fünften Relativlage mit dem nicht-konjugierten Werkzeug nachbearbeitet wurde.

Exemplary embodiments of the invention are described in more detail below with reference to the drawings.

• 1 shows a schematic illustration of a virtual face gear of a bevel gear cutting machine together with a bevel gear workpiece and a gear cutting tool;
• 2 shows a schematic illustration of the radial projection of the tooth flank of a bevel gear workpiece (here a ring gear), which was post-processed with a conjugated honing tool of the prior art;
• 3 shows a schematic perspective view of a constellation of bevel gear workpiece and offset tool with non-conjugated teeth;
• 4A shows a schematic radial projection of the tooth flank of a bevel gear workpiece (here a ring gear), which was post-processed in a first relative position with a non-conjugated tool;
• 4B shows a schematic radial projection of the tooth flank of the 4A , which was reworked in a second relative position with the non-conjugated tool;
• 4C shows a schematic radial projection of the tooth flank of the 4A , which was reworked in a third relative position with the non-conjugated tool;
• 4D shows a schematic radial projection of the tooth flank of the 4A , which was reworked in a fourth relative position with the non-conjugated tool;
• 4E shows a schematic radial projection of the tooth flank of the 4A , which was reworked in a fifth relative position with the non-conjugated tool.

Detailed description

Based on 4A to 4E , details of the method of the invention are described below. It is the representations of the 4A to 4E radial projections of the tooth flank 21 of a tooth of a bevel gear workpiece 20 (here a ring gear). In the lower area is a cut surface through the foot area 22 to recognize the tooth gap. In the area of the tooth flank 21 the contact pattern is shown in schematic form, which results when the tooth flank 21 according to the invention with a non-conjugated tool 10 is processed without relative movement. Here you can also see a group of lines of contact BL (see also 2 ) and a line that runs transversely to it, which defines the contact path KP shows.

Due to the fact that a tool 10 with non-conjugated tooth flank 21 is used, which is arranged axially offset, there is a contact pattern, as in 4A shown as an example and schematically, which is locally limited when the tool 10 no relative movement to the bevel gear workpiece 20 performs.

As mentioned at the beginning, the tooth flank of a bevel gear workpiece and the conjugated tooth flank of a conventional honing tool have the same tangential planes and the same normals along the entire flank. In the case of a bevel gear workpiece 20 and tool 10 with non-conjugated tooth flanks, this definition does not apply.

The procedure is especially for reworking the tooth flanks 21 an already toothed, hardened bevel gear workpiece 20 with one tool 10 designed that has abrasive teeth with non-conjugated, crowned tooth flanks. According to the invention, the tool 10 offset to the bevel gear workpiece 20 arranged. The method comprises at least the following steps, which can also be carried out in a different order.

Either the tool 10 active around a tool spindle axis A1 driven and the bevel gear workpiece 20 turns passively (braked) around a workpiece spindle axis B With. Or it becomes the bevel gear workpiece 20 actively driven around the workpiece spindle axis B and the tool 10 turns passively (braked) around the tool spindle axis A1 With. The braking torque, which is opposed to the rotary movement, basically defines the contact pressure between the non-conjugated, spherical tooth flanks and the flanks of the bevel gear workpiece 20 ,

Alternatively, you can use the tool 10 and the bevel gear workpiece 20 both active, NC -controlled rotary drives. In this case, the rotation is driven in an actively coupled (synchronized form) manner. Such a coupling can be implemented, for example, by means of an electronic gear in the processing machine.

To the tool 10 relative to the bevel gear workpiece 20 to be able to deliver and to engage the teeth with each other, a synchronized, NC -controlled infeed movement of the tool 10 relative to the bevel gear workpiece 20 executed. The concept of synchronized, NC - Controlled infeed is used here to express that the infeed is done so that the teeth of the tool 10 as collision-free as possible in tooth gaps of the bevel gear workpiece 20 plunge.

With the tool at rest, not driven by rotation 10 and bevel gear workpiece 20 can the synchronized, NC -controlled infeed movement take place by changing the phase position of the teeth of the tool 10 with the tooth gaps of the bevel gear workpiece 20 , or vice versa, can be brought into agreement in order to enable a collision-free immersion by a radial infeed movement.

With the tool rotating 10 and bevel gear workpiece 20 can the synchronized, NC -controlled infeed movement by specifying the phase position and the speed so that a collision-free immersion is made possible by a radial infeed movement.

The actual post-processing now takes place as described below.

There is a rolling movement of the tool 10 relative to the bevel gear workpiece 20 executed, this rolling movement includes rolling and sliding. Sliding is responsible for the actual cutting speed required to work with the tool's abrasive teeth 10 cutting material on the tooth flanks of the bevel gear workpiece 20 ablate.

This rolling movement is a coupled rolling movement when the tool is rotating 10 and bevel gear workpiece 20 actively coupled.

In addition to the rolling movement, a superimposed, NC -controlled relative movement of the tool 10 relative to the bevel gear workpiece 20 executed. This relative movement is carried out in such a way that an area of the crowned tooth flanks of the tool 10 along the tooth flanks 21 of the bevel gear workpiece 20 is shifted in a controlled manner. This results in a locally limited, along the tooth flank 21 moving machining area 23 how using the 4A to 4E can be seen.

In the 4A to 4E different snapshots are shown, each with different relative positions of the tool 10 relative to the bevel gear workpiece 20 correspond.

In 4A a first snapshot is shown, in which the tool 10 relative to the bevel gear workpiece 20 is in a first axis-parallel distance, which is also referred to as the installation dimension. This axially parallel distance is in relation to the tool spindle axis A1 Are defined. Now the tool 10 parallel to the tool spindle axis A1 further towards the bevel gear workpiece 20 delivered. Ie the axially parallel distance is reduced. This causes the processing area to move 23 along the tooth flank 21 down and towards the toe Z , A corresponding second snapshot is in 4B shown.

4C shows a third snapshot, with the tool 10 even further parallel to the tool spindle axis A1 in the direction of the bevel gear workpiece 20 was delivered.

With a pure axis-parallel infeed movement, the machining area can 23 in a certain area of the tooth flank 21 be deliberately shifted, as schematically based on an example in the 4A to 4C shown.

To in terms of relative relocation of the machining area 23 To obtain additional degrees of freedom, other relative movements can also be carried out. Based on 4D and 4E is shown schematically that by changing the axis offset in a constellation of tools 10 and workpiece 20 , which simulates a hypoid gear (as in 3 shown), the editing area 23 can also be shifted differently. 4D shows a snapshot with an enlarged center distance of the tool 10 relative to the workpiece 20 , The editing area 23 This has made it slightly towards the toe Z and clearly shifted upwards. 4E shows a snapshot with a reduced center distance of the tool 10 relative to the workpiece 20 , The editing area 23 has thus shifted slightly towards the foot F and clearly downwards.

• - ein Verändern des Achsversatzes des Werkzeugs 10 relativ zum Kegelrad-Werkstück 20, und/oder
• - ein axiales Verlagern des Werkzeugs 10 relativ zum Kegelrad-Werkstück 20 parallel zu der Werkzeugspindelachse A1, und/oder
• - ein axiales Verlagern des Kegelrad-Werkstücks 20 relativ zum Werkzeug 10 parallel zu der Werkstückspindelachse B, und/oder
• - ein Verändern des Achswinkels zwischen dem Werkzeug 10 und dem Kegelrad-Werkstück 20

umfassen.The relative movement can

• - changing the axis offset of the tool 10 relative to the bevel gear workpiece 20 , and or
• - an axial displacement of the tool 10 relative to the bevel gear workpiece 20 parallel to the tool spindle axis A1 , and or
• - an axial displacement of the bevel gear workpiece 20 relative to the tool 10 parallel to the workpiece spindle axis B , and or
• - changing the axis angle between the tool 10 and the bevel gear workpiece 20

include.

By deliberately changing the distance parallel to the axis, which is parallel to the A1 -Axis is defined, and / or by deliberately changing the axis offset parallel to V Axis in 3 is defined, and / or by deliberately changing the axially parallel distance parallel to B -Axis is defined, and / or by deliberately changing the axis angle, the machining area 23 along the tooth flank 21 be relocated. Ie it is possible the tooth flank 21 locally targeted with one tool 10 rework.

By deliberately changing the position of the tool 10 relative to the bevel gear workpiece 20 , post-processing of the tooth flanks 21 done exactly controlled. The final surface shape and texture of the tooth flanks 21 is basically created by post-processing. It is therefore a generating process for reworking the tooth flanks 21 of the bevel gear workpiece 20 where the tooth flanks 21 through a superposition of the rolling motion and the relative motion become. The sliding component of the rolling movement ensures the required cutting speed or the removal work.

The tool 10 , this in 3 Shown by way of example in the form of a hypoid pinion can consist entirely of an abrasive material in all embodiments, or it can comprise a base body in all embodiments, the outer surface of which is at least partially provided with an abrasive material.

The tooth flanks of the tool 10 can be provided with abrasive material in whole or in part in all embodiments.

In at least part of the embodiments, the teeth of the tool 10 defined as conjugated teeth in one design step. These conjugated teeth are, for example, the teeth of a virtual pinion that optimally interlocks with the bevel gear workpiece 20 (Ring gear) is paired. After the conjugate teeth have been designed, the teeth of the tool are modified. The modification creates teeth that are not compatible with the bevel gear workpiece 20 (Ring gear) are conjugated. As part of the modification, the teeth can be provided with a longitudinal and / or vertical crown, for example. In the way of design described here, the non-conjugated teeth are designed virtually by the detour of conjugated teeth before they are then produced.

In another part of the embodiments, the teeth of the tool 10 directly defined as non-conjugated teeth in one design step.

So a tool 10 that according to the invention for reworking a bevel gear workpiece 20 was designed, can be used in real life, should the flanks of the teeth of the bevel gear workpiece 20 and the non-conjugated flanks of the teeth of the tool 10 do not cut.

To ensure the freedom of movement that is required for the tool 10 when reworking the relative movements relative to the bevel gear workpiece 20 can have teeth of the tool 10 in normal section a thickness that is smaller than the gap width of the tooth gaps of the bevel gear workpiece 20 , The tool 10 The invention can therefore be deliberately designed with a game in order to enable larger relative displacements.

LIST OF REFERENCE NUMBERS

Tool / honing tool 1 Bevel gear workpiece 2 tooth flank 3 footer 4 Tool / honing tool 10 Bevel gear workpiece 20 tooth flank 21 footer 22 editing area 23 Tool spindle axis A1 Workpiece spindle axis B contact line BL heel F Contact path KP crown gear PR axis V Wälzwiegenachse W1 toe Z

Claims (12)

Method for reworking the tooth flanks of an already toothed, hardened bevel gear workpiece (20) with an offset tool (10), which has abrasive teeth with non-conjugated, spherically shaped tooth flanks, with the steps (in any order): • Rotating the tool (10) around a tool spindle axis (A1) and / or driving the bevel gear workpiece (20) around a workpiece spindle axis (B), Performing a synchronized, NC-controlled feed movement of the tool (10) relative to the bevel gear workpiece (20) in order to engage the teeth of the tool (10) with tooth gaps of the bevel gear workpiece (20), • To run ◯ a rolling movement of the tool (10) relative to the bevel gear workpiece (20), and ◯ a superimposed, NC-controlled relative movement of the tool (10) relative to the bevel gear workpiece (20), this relative movement being carried out such that a region of the spherical tooth flanks along the tooth flanks (21) of the bevel gear workpiece (20 ) is shifted in such a controlled manner that there is a locally limited machining area (23) which moves along the tooth flanks (21). Procedure according to Claim 1 , characterized in that it is possible due to the non-conjugated, crowned tooth flanks to subject the tooth flanks (21) of the bevel gear workpiece (20) to the post-processing in a locally controlled manner. Procedure according to Claim 1 or 2 , characterized in that it is a generating (explain in description) method for reworking the tooth flanks (21) of the bevel gear workpiece (20), in which these tooth flanks (21) are finished by superimposing the rolling movement and the relative movement. Procedure according to Claim 1 . 2 or 3 , characterized in that the crowned tooth flanks of the tool (10) are crowned in the flank longitudinal direction and / or in the flank height direction. Procedure according to Claim 1 . 2 . 3 or 4 , characterized in that the tool finely processes the bevel gear workpiece without edge wear with the non-conjugated, spherically shaped tooth flanks of the abrasive teeth when carrying out the relative movement. Method according to one of the preceding Claims 1 - 5 , characterized in that • the tool (10) has the shape of a hypoid gear pinion and the bevel gear workpiece (20) has the shape of a ring gear, or • the tool (10) has the shape of a ring gear and the bevel gear workpiece (20) has the shape of a hypoid gear pinion, the tool (10) being arranged axially offset relative to the bevel gear workpiece (20), so that the tool spindle axis (A1) and the workpiece spindle axis (B) do not intersect. Procedure according to one of the Claims 1 to 6 , characterized in that the NC-controlled relative movement is carried out as a uniform relative movement. Procedure according to one of the Claims 1 to 7 , characterized in that the relative movement comprises: • changing the axial offset of the tool (10) relative to the bevel gear workpiece (20), and / or • axially displacing the tool (10) relative to the bevel gear workpiece (20) parallel to the tool spindle axis (A1), and / or • an axial displacement of the bevel gear workpiece (20) relative to the tool (10) parallel to the workpiece spindle axis (B), and / or • a change in the axis angle between the tool (10) and the Bevel gear workpiece (20). Procedure according to one of the Claims 1 to 8th , characterized in that the tool (10) consists entirely of an abrasive material, or that the tool (10) comprises a base body, the outer surface of which is at least partially provided with an abrasive material. Procedure according to one of the Claims 1 to 9 , characterized in that the bevel gear workpiece is ground with the tool after hardening and before reworking. Procedure according to one of the Claims 1 to 9 , characterized in that the post-processing is a kind of honing process. Procedure according to one of the Claims 1 to 9 , characterized in that the tool (10) is driven in a NC-controlled manner about the tool spindle axis (A1) and / or in that the bevel gear workpiece (20) is driven in a NC-controlled manner about the workpiece spindle axis (B).

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