Apparatus and method for chamfering the edges of teeth

Abstract

The invention relates to an apparatus for deburring the front edges (7', 8',9') of a toothing of a workpiece (4), a tool (3) having cutting edges (12) being carried by an angle gearing (5) that is driven for rotation by a tool spindle (1).

Description

Description Device and method for chamfering tooth edges Field of technology

[0001] The invention relates to a method for deburring the end edges of a toothing of a workpiece located in an end face of a toothing, in which the workpiece is driven in rotation about a workpiece axis by a workpiece spindle rotating about a workpiece spindle axis of rotation, and in which a tool having at least one cutting edge extending in a cutting edge plane is driven in rotation about a tool axis lying in the cutting edge plane in synchronism with the workpiece by a tool spindle rotating about a tool spindle axis of rotation, wherein the cutting edge produces a chamfer on a front edge of a first tooth of the workpiece and on a front edge of a second tooth of the workpiece.

[0002] The invention further relates to a device for carrying out the method with a workpiece spindle that can be driven in rotation about a workpiece spindle axis by a drive motor, with a chuck for receiving a workpiece that can be driven in rotation about a workpiece axis, with a tool spindle that can be driven in rotation about a tool spindle axis by a drive motor for driving a tool about a tool axis, wherein the tool has a cutting edge extending in a cutting edge plane, in which cutting edge plane the tool axis runs, with a control device with which the drive motors can be driven in a synchronized manner to one another such that the cutting edge creates a chamfer on a front edge of a first tooth of the workpiece and a front edge of a second tooth of the workpiece, wherein the tool spindle axis of rotation is axially coupled to a drive axis of an angular gear and a 31065PCT – 7.05.2024 The output axis of the angular gear, which is at a 90° angle to the drive axis, has a tool chuck in which a tool shank is inserted. State of the art

[0003] In a generic method, the tooth edges of the workpiece's teeth located in the end face of a spur gearing are machined with a cutting-edge tool. The tool axis runs perpendicular to the workpiece axis and is driven by a drive motor. The drive motor is driven synchronously with a drive motor of a workpiece spindle, so that the cutting edge of the tool deburrs the end edges of two adjacent teeth by cutting a chamfer extending along a U-shaped contour line into the end edges.

[0004] From DE 2157619 A a method and a device are known with which a chamfering of the front edges can be carried out using a gear-shaped tool.

[0005] DE 3240165 A1 describes a roofing device in which two synchronously driven fly blades can each machine one tooth edge.

[0006] From DE 1048762 A a method and a device are known in which fly knives have cutting edges adapted to the contour of a slope to be produced.

[0007] A generic method and a generic device are described in DE 4122461 C1. The tool spindle rotation axis carries an angular gear, the housing of which is used for machining the 31065PCT – 7.05.2024 Front edges of a front side of an internal gear partially penetrate into the cavity of the workpiece surrounding the gear.

[0008] From JP 2006-026853 A a finger milling cutter is already known which can be used for deburring tooth edges.

[0009] DE 102016015528 A1 describes the use of an asymmetric cutting edge on a cutting-edge tool for deburring front edges, wherein the rotational axes of the tool and workpiece are skewed relative to each other. Devices for deburring tooth flanks are also known from DE 19902035 A1 and JP 2022-056968 A. Summary of the Invention

[0010] The invention is based on the object of developing the generic method in a manner that is advantageous in use.

[0011] The problem is solved by the invention specified in the claims, wherein the subclaims not only represent advantageous developments of the invention specified in the subordinate claims, but are also independent solutions to the problem.

[0012] First and foremost, it is proposed that the back of the internal gearing facing the workpiece spindle, i.e., away from the tool spindle, be machined. According to the invention, the housing of the bevel gear penetrates through the cavity surrounded by the gearing. It is particularly provided that a clearance remains between the back of the gearing, i.e., the rear face of the gear, and any existing base of the chuck gripping the workpiece, into which the cutting edge tool and a portion of the housing head can be inserted. 31065PCT – 7.05.2024 of the angular gear. The method according to the invention can also be used to machine workpieces that have a collision contour, for example, a base or a step that is spaced from the rear end face of the gearing. Preferably, the tool axis has an inclination angle different from zero relative to the rotational plane of the workpiece.

[0013] The device according to the invention comprises a tool having at least one cutting edge. The cutting edge extends in a cutting edge plane, wherein the tool axis around which the tool is rotated lies in the cutting edge plane. The cutting edge rotates in a surface of rotation. The cutting edge can have several sections, each of which can run straight at an angle to the tool axis or parallel to the tool axis. However, the tool can also have two cutting edges. The two cutting edges can lie in the same cutting edge plane. However, the tool can also have three or more cutting edges, each of which lies in a cutting edge plane, wherein the cutting edge planes are arranged in a uniform circumferential distribution around the tool axis.If the toothed workpiece to be deburred has no collision surfaces, the tool axis can run perpendicular to the workpiece axis and intersect the workpiece axis. The tool axis can therefore lie in a rotational plane and in a radial plane, with the workpiece axis lying in the radial plane and a contact point of the cutting edge in the center of the front edge of a tooth gap. The rotational movement of the tool axis is synchronized with the rotational movement of the workpiece axis in such a way that different axial sections of the cutting edge, in a continuous movement, make a preferably uninterrupted cut on the front side of the toothing. This cut can produce a chamfer extending from the tip of a first tooth through the tooth gap to the tip of a second tooth, whereby burrs created during tooth cutting are removed. 31065PCT – 7.05.2024 Not only can the front edges of the tooth flanks be deburred by forming a chamfer. The front edge of the tooth root can also be deburred by forming a chamfer. A continuous chamfer can be formed that extends from the tip of one tooth through the entire tooth gap to the tip of another tooth. With this process, it can be provided that the cutting edge creates the chamfer in a continuous cut, starting at the tip of a front edge of a first tooth of the workpiece, continuing the cut along a front edge of a tooth gap base of a tooth gap adjacent to the first tooth and along a front edge of a subsequent second tooth of the workpiece up to its tip.However, it can also be provided that the cutting edge creates the chamfer starting at the tooth tip of a front edge of the first tooth of the workpiece and emerges shortly before reaching the tooth gap base and then plunges into the area of ​​a front edge of an adjoining second tooth near the tooth gap base to produce the chamfer of the front edge of a second tooth. The front edges can be machined in synchronous milling, in which the movement of the contact point between the cutting edge and the front edge has a movement component in the direction of rotation of the workpiece. The front edges can also be machined in counter-rotation, in which the movement of the contact point between the cutting edge and the front edge has a movement component that is opposite to the direction of rotation of the workpiece. The production of a chamfer, which can have a chamfer width of less than 1 mm, begins at the tooth tip of a first tooth.Here, a first point of the rotating cutting edge encounters the front edge of the first tooth, which transitions into a tip edge. The intersection point travels over the front edge and simultaneously along the cutting edge towards the free end of the tool. The cutting edge then encounters the front edge of the tooth gap base, in which a chamfer is also created, and then the front edge of a tooth flank of a second tooth, which is adjacent to the first tooth. Here, the intersection point travels over the front edge of the. 31065PCT – 7.05.2024 From the tooth base to the tooth tip and simultaneously along the cutting edge in the direction away from the free end of the tool. In the preferred embodiment, a front edge on the tip side is not deburred. This front edge can be deburred using a rotary jet.

[0014] According to a first variant of the invention, the tool axis has an inclination angle other than zero to a rotational plane of the workpiece that is perpendicular to the workpiece axis. This variant of the method can be used to tooth cut, in particular, internally toothed workpieces that have collision contours. The tool drive can be arranged on the side of the workpiece opposite the end face to be chamfered. In the case of an internally toothed workpiece, the drive can be provided by the free space of the workpiece surrounded by the toothing. The inclination angle can, for example, be at least 3° and / or a maximum of 60°. However, it can also be smaller or larger. A tool used for this purpose can have a cutting edge that has a greater radial distance from the tool axis on the shank side than at the free end.For larger inclination angles, the cutting edge can also have a central section with the greatest radial clearance. It is also intended that the cutting edge has a smaller radial clearance on the shank side than at the free end of the tool.

[0015] According to a second variant of the invention, the tool axis has a pivot angle different from zero to the radial plane in which the tool axis extends and which runs through a contact point of the cutting edge through the front edge. In this variant, the tool axis has a center offset to the center of the workpiece. With this variant, symmetrical chamfers can be produced even on helically toothed workpieces and in particular on workpieces where the front faces of the workpieces to be machined are 31065PCT – 7.05.2024 The deburring edges do not run on a flat surface, but rather, for example, on a conical surface. The swivel angle can, for example, be at least 3° and / or a maximum of 60°. However, it can also be smaller or larger. In this variant, the tool axis runs at an angle to a tangent to the workpiece lying in the rotation plane that is different from 90°.

[0016] According to a third variant of the invention, which can preferably be combined with the first and second variants, the rotary movement of the tool spindle rotation axis is converted into a rotary movement of the tool axis by means of an angular gear. The angular gear can be located in the free space of the workpiece surrounded by the gearing, particularly when machining internally toothed workpieces during chamfering. The tool spindle preferably has an axis of rotation that is identical to the axis of a drive motor or that runs parallel to the axis of a drive motor of the tool spindle. A drive axis of the angular gear forms a linear extension of the tool spindle rotation axis. The angular gear is thus preferably used to convert the rotary movement of a drive motor into a rotary movement perpendicular to it. With this rotary movement perpendicular to the rotary movement of the drive motor, the tool is rotated about its tool axis.The angular gear can have a drive shaft, which is coupled to an output shaft, for example, via a bevel gear. The drive shaft can have a chuck into which a tool shank can be inserted. The tool shank preferably has a non-circular section and, in particular, a flattened portion that corresponds to a flattened portion of the tool chuck or a clamping screw in the tool chuck, so that the tool can be mounted in a defined angular position relative to the tool spindle. 31065PCT – 7.05.2024

[0017] The method according to the invention and the device according to the invention enable the deburring of small and internally toothed gears which may have collision contours.

[0018] To carry out the method, a tool can be used which has a cutting edge lying in a cutting edge plane. According to the invention, the tool axis around which a shank of the tool can rotate should lie in the cutting edge plane. The tool can have a plurality of cutting edge planes which are offset at an angle around the tool axis and in each of which a cutting edge runs. If the tool has two cutting edges or an even number of cutting edges, two cutting edges can lie in a common cutting edge plane. The cutting edge can have a plurality of cutting edge sections. The cutting edge sections can have a different edge angle to the tool axis. The cutting edge sections can be directed away from a shank of the tool or towards the shank.An auxiliary line drawn through a cutting edge section can, for example, intersect the tool axis in the area of ​​the shank or intersect the tool axis on the opposite side of the shank. The circumferential surface of the cutting edge can also be a conical surface. A rake face of the tool can lie in the cutting edge plane. However, it is also possible for the tool to have a positive or negative rake angle. The clearance angle of the cutting tool is preferably selected such that the tool does not collide with the teeth of the gearing to be machined during its rotation. The speed ratio between tool and workpiece can be selected such that the tool only machines every second or third tooth gap. If the workpiece rotates several times, all tooth edges are machined. According to the invention, the direction of the tool axis can have a directional component running in the direction of the tool rotation axis.The tool axis can also have a directional component. 31065PCT – 7.05.2024 pointing in the direction of a tangent passing through the contact point of the cutting edge and perpendicular to a radial to the workpiece axis. Brief description of the drawings

[0019] Embodiments of the invention are explained below with reference to the attached drawings. They show: Fig. 1 schematically a first embodiment of the invention, Fig. 2 a plan view of an end face 23 of a gear 4 to illustrate the path of the chip removal point, Fig. 2a a representation according to Figure 2, but for a variant of a method, Fig. 3 the section along the line III-III in Figure 2, Fig. 4 the section along the line IV-IV in Figure 2, Fig. 5 a plan view of the first embodiment of the invention, Fig. 6 a representation similar to Figure 1 of a second embodiment of the invention, Fig. 7 a representation similar to Figure 5 of a third embodiment of the invention, Fig. 8 the view of a toothing according to arrow VIII in Figure 7, 31065PCT – 7.05.2024 Fig. 9 shows the section along the line IX-IX in Figure 7, Fig. 10 shows a view of a first embodiment of a tool 3, Fig. 11 shows the tool according to Figure 10 looking in the direction of arrow XI in Figure 10, Fig. 12 shows a perspective view of the tool, Fig. 13 shows a view of a second embodiment of a tool 3, Fig. 14 shows a view similar to Figure 5 of a fourth embodiment of the invention, and Fig. 15 shows a view similar to Figure 1 of a fifth embodiment of the invention. Description of the Embodiments

[0020] The machine tool according to the invention has a machine bed (not shown in the drawings) to which a tool spindle 1 and a workpiece spindle 2 are attached. The workpiece spindle 2 or the tool spindle 1 can be fixedly mounted on the machine bed. The workpiece spindle 2 or the tool spindle 1 has an axis that can be driven in rotation. For this purpose, the workpiece spindle 2 or the tool spindle 1 has a drive motor. 31065PCT – May 7, 2024

[0021] The other axis, i.e., either the workpiece spindle 2 or the tool spindle 1, can be displaced in three spatial directions relative to the previously mentioned tool spindle 1 or workpiece spindle 2. This workpiece spindle 2 or tool spindle 1 also has a drive motor with which an axis can be rotated.

[0022] According to a preferred embodiment, the tool spindle 1 is fixedly mounted on the machine bed. However, the tool spindle 1 can be tilted by an angle α.

[0023] The tool spindle 1 carries an angular gear 5. The angular gear 5 has a drive axis 21, which is axially coupled to an output shaft (not shown) of the tool spindle 1, which can rotate about the tool spindle's axis of rotation 1'. The drive axis 21 thus rotates about the tool spindle's axis of rotation 1'. The drive axis 21 is rotationally coupled to an output axis 22. This can be achieved via a bevel gear. The output axis 22 is perpendicular to the drive axis 21. A tool chuck 25 is rotationally driven by the output axis 22. The axis of rotation of the tool chuck 25 is thus perpendicular to the tool spindle's axis of rotation 1'.

[0024] The tool spindle 2 has a chuck 6 in which a workpiece 4 is clamped. The workpiece 4 is a gear. The gear has spur gearing. The spur gearing can be spur or helical. It can be internal or external. Figure 1 shows a workpiece 4, which is a gear with internal gearing, with the gearing being spur. The workpiece 2 has a workpiece axis 10 that coincides with the workpiece spindle rotation axis 2'. 31065PCT – 7.05.2024

[0025] The tool 3 clamped in the tool chuck 25 is shown in Figures 10 to 11. It has a shank 17 and a head that forms a cutting edge 12. In the exemplary embodiment, the tool 3 has two cutting edges 12 running in a common cutting edge plane E. The cutting edge plane E runs through the tool axis 10. The cutting edge 12 has several cutting edge sections 14, 15, 16, which run at an angle ε1, ε2 to the workpiece axis 10. The angles here can be 12° and 15°. An auxiliary line HL, which is laid through one of the cutting edge sections 14, 15, 16, intersects the tool axis 10 on its side facing away from the shank 17.

[0026] In a variant not shown, the cutting edge 12 runs along a free contour, whereby this contour can run in a plane. However, the contour can also run freely in space, so that sections of the cutting edge 12 are angularly offset from one another.

[0027] The rake face lies in the cutting edge plane E. The flanks are inclined relative to the cutting plane. The clearance angles γ1, γ2, γ3 are selected such that no collisions occur during the process described below. Three flanks located one behind the other in the circumferential direction have clearance angles γ1 = 12°, γ2 = 18°, γ3 = 32°. The shank 17 has a flattened portion 18, by means of which the shank 17 can be secured in a defined rotational position in the tool chuck 25. The flattened portion extends in a plane perpendicular to the cutting edge plane E.

[0028] An electronic control device 20 is provided, with which the tool spindle 1 and the workpiece spindle 2 are driven in rotation such that the tool spindle rotation axis 1' rotates at a predetermined speed ratio to the workpiece spindle rotation axis 2'. 31065PCT – 7.05.2024

[0029] With the device described above, a front edge 7', 8' of a tooth 7, 8 adjacent to an end face 23 of a toothed workpiece 4 and the front edge 9' of a tooth gap base of a tooth gap 9 located between the teeth 7, 8 can be deburred. For this purpose, the front edges 7', 8' of the teeth 7, 8 adjacent to a tooth gap 9 and the front edge 9' of the tooth gap base of the tooth gap 9 are partially removed with the cutting edge 12, forming a U-shaped chamfer 24. For this purpose, a cutting edge section 16 of the cutting edge 12 in the area of ​​the tooth tip 7'' of the tooth 7 dips into the area of ​​the front edge 7'. During the synchronized rotation of the workpiece 4 and tool 3, the chip removal point migrates from the tooth tip 7'' to the tooth gap base. The chip removal point changes from one cutting edge section 16 to another cutting edge section 15, with which the front edge 9' of the tooth gap base is machined.The cutting edge 12 then machines the front edge 8' of the adjacent tooth. During machining, the chip removal point moves not only over the front edges 7', 8', 9', but also along the cutting edge 12. When machining the front edge 8' of the adjacent tooth 8, the chip removal point changes from the cutting edge section 15 back to the cutting edge section 16. The path that the chip removal point follows during the creation of the U-shaped chamfer is shown in dashed lines in Figure 2. The front edges of the tooth tips 7'', 8'' are not machined.

[0030] Figure 2a shows a variant of the process described in Figure 2. Here, only the opposing front edges 7', 8' of a tooth 7, 8 are provided with a chamfer 24. The cutting edge plunges into the workpiece in the area of ​​the head 7'' and leaves the workpiece before reaching the front edge 9' of the tooth gap base. The opposite chamfer of the front edge 8' is manufactured in a similar manner, with the cutting edge plunging into the workpiece shortly after passing over the tooth base 9' in order to provide the front edge 8' with a chamfer. 31065PCT – May 7, 2024

[0031] In the embodiment shown in Figure 1, the tool axis 10 runs perpendicular to the workpiece spindle rotation axis 2' and intersects the workpiece spindle rotation axis 2'. Here, the tool axis 10 lies in a radial plane through the workpiece spindle rotation axis 2'.

[0032] The second embodiment shown in Figure 6 shows a workpiece 4 with a collision contour. Here, the tool axis 10 has an inclination angle α that is greater than 0 to the rotation plane D of the workpiece 4. As a result of the inclination angle, which can be between 10° and 16°, collisions with the housing of the angular gear 5 and the workpiece 4 can be avoided. The tool 3 can have one or more cutting edges 12 that have an inclination or no inclination to the tool axis 10. A tool can be used here as shown in Figure 13. The cutting edge sections 14, 15, 16 have such an inclination to the tool axis 10 that an auxiliary line HL drawn through the cutting edge sections 14, 15, 16 intersects the tool axis 10 on the side facing the shaft 17.

[0033] The angular gear 5 has a length measured in the axial direction 1' or a plan view running transversely thereto such that the housing of the angular gear 5 can penetrate into the interior of the gear 3. An end face of the tool spindle 1, to which the angular gear 5 is attached, can have a distance from the opposite end face 23' to be machined. The length of the housing of the angular gear 5 measured in the axial direction is preferably greater than the distance between the two end faces 23, 23'.

[0034] The diameter of the housing of the angular gear 5 is also dimensioned such that the housing of the angular gear 5 can also be used in the position shown in Figure 6 31065PCT – 7.05.2024 shown inclination position lies in the space surrounding the internal gearing.

[0035] The embodiment illustrated in Figure 7 shows a setting of tool spindle 1 relative to workpiece spindle 2 for deburring a gearing which is a helical gearing or in which the end face 23 of the workpiece 4 does not run in a plane, in which the end face 23 is, for example, a conical surface. Here, the tool axis 10 is at a pivot angle β which is greater than 0 to the radial plane R, with the workpiece axis 11 lying in the radial plane R and the radial plane R running through the contact point of the cutting edge 12 in the center of the end edge 9' of the tooth gap 9. This pivot angle β compensates for distortions caused by the profile of the end face 23 or the profile of the gearing.

[0036] Figures 8 and 9 show the profile of the end face 23 as a conical surface of an internal toothing.

[0037] Figure 14 shows a further embodiment similar to the embodiment shown in Figure 7. Here, too, the tool axis 10 is at an angle to a radial plane R.

[0038] Figure 14 shows another embodiment for deburring an external gear with a collision contour. Here, the tool axis 10 is at an inclination angle α to the rotation plane D of the workpiece 4.

[0039] It is considered advantageous that by simply placing an angular gear 5 on a tool spindle 1, whose tool spindle rotation axis 1' is substantially parallel to the workpiece spindle rotation axis 2', 31065PCT – 7.05.2024 runs or only needs to be inclined, the tooth edges of an internal gear can also be deburred. It is also advantageous that the front edges of a tooth gap can be completely deburred with a single cut and in particular a continuous cut by creating a phase in the front edge area that also includes the tooth gap base. It is also considered advantageous if the outline contour of the housing of the angular gear 5 lying in the plane of rotation of the drive axis 21 or an end face of the tool spindle 1 is kept so small that the housing of the angular gear 5 lies at least in the space surrounding the internal gear during chamfering. A head region of the housing of the angular gear 5 can also protrude from the gearing to be machined on the side opposite the tool spindle 1.Chamfering is therefore preferably carried out with the housing of an angular gear 5 projecting at least partially through the space surrounded by the internal toothing.

[0040] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art at least by the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0041] A method which is characterized in that the tool axis 10 has an inclination angle α different from zero to a rotational plane D of the workpiece 4 which is perpendicular to the workpiece axis 11 and / or that the tool axis 10 has a pivot angle β different from zero to a radial plane R in which the workpiece axis 11 and a contact point of the cutting edge 12 in the center of the front edge 9' of the 31065PCT – 7.05.2024 tooth gap, and / or that the tool axis 10 runs perpendicular to the workpiece spindle axis 1'.

[0042] A method characterized in that the gearing is an internal gearing.

[0043] A method which is characterized in that the tool 2 has cutting edges 12 lying in a common cutting edge plane E.

[0044] A method which is characterized in that the cutting edge 12 has a plurality of cutting edge sections 14, 15, 16 arranged one behind the other in the direction of the tool axis 10, which have different edge angles ε1, ε2 to the tool axis 10, wherein at least one auxiliary line HL drawn through one of the cutting edge sections 14, 15, 16 intersects the tool axis 10 on a side opposite a drive shaft 17 or on the side of the drive shaft 17.

[0045] A method which is characterized in that the end face 23 has a conical angle and / or the toothing is a helical toothing.

[0046] A method characterized in that a housing of the angular gear 5 lies, at least in part, within the space of the workpiece 4 surrounded by internal toothing during chamfering, or in that a head region 5' of the angular gear 5 facing away from the tool spindle 1 protrudes from the internally toothed cavity of the workpiece 4 through which the angular gear 5 extends. 31065PCT – 7.05.2024

[0047] A method which is characterized in that the cutting edge 12 produces the chamfer 24 in an uninterrupted cut starting at the tooth tip 7'' of a front edge 7' of a first tooth 7 of the gearing 4, continuing the cut along a front edge 9' of a tooth gap base of a tooth gap 9 adjoining the first tooth 7 and along a front edge 8' of an adjoining second tooth 8 of the workpiece 4 up to its tip 8''.

[0048] A device characterized in that the drive axis 21 is a linear extension of the tool spindle rotation axis 1'.

[0049] A device which is characterized in that the tool 3 has cutting edges 12 lying in a common cutting edge plane E.

[0050] A device which is characterized in that the cutting edges 12 have a plurality of cutting edge sections 14, 15, 16 arranged one behind the other in the direction of the tool axis 10, which have different edge angles ε1, ε2 to the tool axis 10, wherein at least one auxiliary line HL drawn through one of the cutting edge sections 14, 15, 16 intersects the tool axis 10 on a side opposite the drive shaft 17 or on the side of the drive shaft 17.

[0051] A device characterized in that the controller is programmed such that the device carries out a method according to any one of claims 1 to 8.

[0052] All disclosed features are essential to the invention (individually, but also in combination with one another). 31065PCT – 7.05.2024 The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby incorporated in its entirety, also for the purpose of incorporating features of these documents into the claims of the present application. The subclaims, even without the features of a referenced claim, characterize independent inventive developments of the prior art with their features, in particular for filing divisional applications based on these claims. The invention specified in each claim may additionally comprise one or more of the features indicated in the above description, in particular those provided with reference numbers and / or indicated in the list of reference numbers.The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular to the extent that they are clearly dispensable for the respective intended use or can be replaced by other technically equivalent means. 31065PCT – May 7, 2024. List of reference symbols 1 Tool spindle 20 Control device 1' Tool spindle rotation axis 21 Drive axis 2 Workpiece spindle 22 Output axis 2' Workpiece spindle rotation axis 23 End face 3 Tool 23' End face 4 Gear, workpiece 24 Chamfer 5 Angular gear 25 Tool chuck 5' Head area 26 Base surface 6 Chuck 7 Tooth α Inclination angle 7' End edge β Swivel angle 7'' Tooth tip ε1 Edge angle 8 Tooth ε2 Edge angle 8' End edge γ1 Clearance angle 8'' Tooth tip γ2 Clearance angle 9 Tooth gap γ3 Clearance angle 9' End edge 10 Tool axis 11 Workpiece axis a Distance 12 Cutting edge 13 Chip face 14 Cutting edge section D Rotation plane of the workpiece 15 Cutting edge section E Cutting edge plane 16 Cutting edge section HL Auxiliary line 17 Shank R Radial plane 18 Flattening 19 End face 31065PCT – 7.05.2024

Claims

Claims 1. Method for deburring the end edges (7', 8', 9') of an internal toothing of a workpiece (4) lying in an end face (23) of a spur gear, wherein the workpiece (4) is driven in rotation about a workpiece axis by a workpiece spindle (2) rotating about a workpiece spindle rotation axis (2') and has a front side (23') facing away from the workpiece spindle (2) and a rear side (23) facing the workpiece spindle (2), wherein a tool spindle (1) carries an angular gear (5), the drive axis (21) of which is coupled to an output shaft of the tool spindle (1) and the output axis (22) of which has a tool chuck (25) which rotates about a tool axis (10) running perpendicular to a tool spindle rotation axis (1') in synchronism with the workpiece (4) is driven in rotation, wherein in the tool chuck (25) there is a tool (3) having at least one cutting edge (12), with which the front edges (7', 8') of a tooth (7,8) of the workpiece (4), a chamfer (24) is created, wherein a housing of the angular gear (5) dips into a cavity of the workpiece (4) surrounded by the internal toothing, characterized in that the end edges (7', 8') of the rear side (23) are machined with the tool (3).

2. Method according to claim 1, characterized in that a head region (5') of the angular gear (5) pointing away from the workpiece spindle (1) protrudes from the internally toothed cavity of the workpiece (4) through which the angular gear (5) passes.

3. Method according to one of the preceding claims, characterized in that the tool axis (10) has an inclination angle (α) different from zero to a rotational plane (D) of the workpiece (4) that is perpendicular to the workpiece axis (11). 31065PCT - 7.05.2024, 4. Method according to one of the preceding claims, characterized in that the rear side (23) is at a distance from a bottom surface (23) of a chuck (6) with which the workpiece (4) is held on the workpiece spindle (2) or at a distance from a bottom surface of a cavity in the workpiece (4).

5. Method according to one of the preceding claims, characterized in that the tool (2) has cutting edges (12) lying in a common cutting edge plane (E). 6.Method according to one of the preceding claims, characterized in that the cutting edge (12) has a plurality of cutting edge sections (14, 15, 16) arranged one behind the other in the direction of the tool axis (10), which have different edge angles (ε1, ε2) to the tool axis (10), wherein at least one auxiliary line (HL) drawn through one of the cutting edge sections (14, 15, 16) intersects the tool axis (10) on a side opposite a drive shaft (17) or on the side of the drive shaft (17).

7. Method according to one of the preceding claims, characterized in that the end face (23) has a conical angle and / or the toothing is a helical toothing. 8.Method according to one of the preceding claims, characterized in that the cutting edge (12) begins in an uninterrupted cut at the tooth tip (7'') of a front edge (7') of a first tooth (7) of the toothing (4), the cut along a front edge (9') of a tooth gap base of a tooth gap (9) adjacent to the first tooth (7) and along a front edge (8') of an adjoining second 31065PCT - 7.05.2024. tooth (8) of the workpiece (4) up to its head (8''), the chamfer (24) is produced.

9. Device for carrying out a method according to one of the preceding claims, with a workpiece spindle (2) which can be driven in rotation about a workpiece spindle axis (2') by a drive motor, with a chuck (6) for receiving a workpiece (4) which can be driven in rotation about a workpiece axis and has an internal toothing, with a tool spindle (2) which can be driven in rotation about a tool spindle axis (1') by a drive motor for driving a tool (3) which has a cutting edge (12), wherein the tool spindle (1) carries an angular gear (5), the drive axis (21) of which is coupled to an output shaft of the tool spindle (1) and the output axis (22) of which has a tool chuck (25) in which the tool (3) is inserted, with a control device (20) with which the drive motors can be driven in a synchronized manner with one another,that the cutting edge (12) creates a chamfer (24) on a front edge (9') of a first tooth (8) of the internally toothed workpiece (4) and on a front edge (8') of a second tooth (8) of the workpiece (4), characterized in that the control device (20) is configured to carry out a method according to one of claims 1 to 8.

10. Device according to claim 9, characterized in that the drive axis (21) is a linear extension of the tool spindle rotation axis (1').

11. Device according to claim 9 or 10, characterized in that the tool (3) has cutting edges (12) lying in a common cutting edge plane (E). 31065PCT - 7.05.2024, 12. Device according to claim 9, 10 or 11, characterized in that the cutting edges (12) have a plurality of cutting edge sections (14, 15, 16) arranged one behind the other in the direction of the tool axis (10), which have different edge angles (ε1, ε2) to the tool axis (10), wherein at least one auxiliary line (HL) drawn through one of the cutting edge sections (14, 15, 16) intersects the tool axis (10) on a side opposite the drive shaft (17) or on the side of the drive shaft (17).

13. Method or device, characterized by one or more of the characterizing features of one of the preceding claims. 31065PCT – 7.05.2024

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