Tool and Method for Chip-Removing Deburring and/or Chamfering of a Workpiece Toothing Comprising a Plurality of Workpiece Teeth

Abstract

Described and illustrated is a tool for chip-removing deburring and/or chamfering of a workpiece toothing including a plurality of workpiece teeth, having a plurality of cutting edges for chip-removing deburring and/or chamfering of workpiece edges, in particular front edges, of the workpiece toothing each extending between a tooth flank and a front side of a workpiece tooth, the cutting edges arranged distributed around a tool rotation axis of the tool and each having an extension along the tool rotation axis. In order that the compromise between low manufacturing costs and long tool service life can be improved, it is provided that the cutting edges are formed by tool teeth of at least one tool toothing of the tool.

Claims

1. A tool for chip-removing deburring and/or chamfering of a workpiece toothing comprising a plurality of workpiece teeth, having a plurality of cutting edges for chip-removing deburring and/or chamfering of workpiece edges, in particular front edges, of the workpiece toothing each extending between a tooth flank and a front side a workpiece tooth, the cutting edges arranged distributed around a tool rotation axis of the tool and each having an extension along the tool rotation axis, wherein the cutting edges are formed by tool teeth of at least one tool toothing of the tool.

2. The tool according to claim 1, wherein the tool toothing comprises at least five, as required at least ten, preferably at least fifteen, in particular at least twenty, tool teeth each forming at least one cutting edge and/or in that the cutting edges each have an extension in the circumferential direction with respect to the tool rotation axis and/or in that the cutting edges are arranged at least substantially on a cylinder shell surface and/or cone shell surface around the tool rotation axis.

3. The tool according to claim 1, wherein the tool toothing is designed as front toothing and/or in that the projections of the tool teeth onto a projection plane arranged perpendicular to the tool rotation axis each extend at least substantially radially to the tool rotation axis.

4. The tool according to claim 1, wherein the cutting edges each extend between a tooth flank and a front side of a tool tooth, the front side, in particular, being arranged radially outside with respect to the tool rotation axis.

5. The tool according to claim 1, wherein the tool teeth each comprise two cutting edges, in particular assigned to different tooth flanks of the tool tooth, for deburring and/or chamfering of mutually opposite workpiece edges of the workpiece teeth.

6. The tool according to claim 1, wherein the tool teeth each have, at least in the region of the at least one cutting edge, an at least substantially axisymmetric or asymmetrical cross-section.

7. The tool according to claim 1, wherein the tool comprises two tool toothings spaced apart from one another along the tool rotation axis, in particular facing one another, for simultaneous deburring and/or chamfering of workpiece edges assigned to different front sides of the workpiece toothing.

8. The tool according to claim 1, wherein the tool teeth each taper at least in one cross-section in the region of the at least one cutting edge at the tooth head of the tool tooth.

9. The tool according to claim 1, wherein the tool toothing faces a clamping section of the tool for clamping the tool in a tool holder and/or in that a carrier element carrying the at least one tool toothing, in particular extending along the tool rotation axis and/or comprising the clamping section, is provided.

10. The tool according to claim 1, wherein the cutting edges have an edge radius of at least 0.01 mm, preferably at least 0.02 mm, and/or at most 0.2 mm, preferably at most 0.1 mm, in particular at most 0.05 mm, and/or in that the tool toothing, at least in the region of the cutting edges, has a hardness of at least 60 HRC, preferably at least 63 HRC, in particular at least 66 HRC.

11. A method for chip-removing deburring and/or chamfering of a workpiece toothing of a workpiece comprising a plurality of workpiece teeth with at least one tool according to claim 1, in which the tool is rotated about the tool rotation axis with engagement of the tool toothing in the workpiece toothing, and in which with the cutting edges of the tool toothing engaging in the workpiece toothing, the workpiece edges, in in particular front edges, of the workpiece toothing each extending between a tooth flank and a front side of a workpiece tooth are at least in sections deburred and/or chamfered in a chip-removing manner.

12. The method according to claim 11, in which the workpiece is a, in particular internally toothed, gear wheel and/or in which the workpiece being in engagement with the tool is rotated about a workpiece rotation axis, which is, in particular, at least substantially parallel to the tool rotation axis.

13. The method according to claim 11, in which consecutive workpiece teeth of the workpiece toothing are deburred and/or chamfered with consecutive tool teeth of the tool toothing and/or in which, during one rotation of the workpiece about the workpiece rotation axis, at least one workpiece edge of each workpiece tooth is deburred and/or chamfered at least in sections, in particular at least substantially, with the tool toothing.

14. The method according to claim 11, in which the cutting edges are each moved in the direction of the tooth base of the workpiece tooth to be machined in each case along the workpiece edge to be machined and/or in which, during one rotation of the tool about the tool rotation axis, with the tool teeth in each case the workpiece edge to be machined is deburred and/or chamfered at least substantially from the tooth head to at least substantially the tooth base of the workpiece tooth to be machined.

15. The method according to claim 11, in which mutually opposite workpiece edges of the workpiece teeth are deburred and/or chamfered with the same tool toothing and/or in which the tool, during deburring and/or chamfering of mutually opposite workpiece edges of the workpiece teeth, is rotated in opposite directions of rotation about the tool rotation axis and/or in which workpiece edges assigned to different front sides of the workpiece toothing are simultaneously deburred and/or chamfered, in particular with the same tool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The invention is explained in more detail below by means of a drawing showing only an exemplary embodiment. In the drawing,

[0047] FIG. 1A-B show schematically a tool according to the invention during deburring and chamfering of a workpiece toothing of a workpiece in a perspective view and a side view,

[0048] FIG. 2A-C show schematically a tool element of the tool from FIG. 1 forming a tool toothing in a perspective view from above, a perspective view from below and a side view,

[0049] FIG. 3A-B show schematically a detail of the tool and the workpiece from FIG. 1 with opposite directions of rotation of the tool and the workpiece in each case in the area III shown in FIG. 1A in a perspective view.

DESCRIPTION OF THE INVENTION

[0050] In FIGS. 1A-B, a tool 1 and a workpiece 2 are shown in a perspective view and in a side view. The workpiece 2 is designed as an internally toothed gear wheel, which comprises a in the present case helical toothed workpiece toothing 3 with a plurality of workpiece teeth 4. The workpiece teeth 4 each comprise two front sides 5, 6 and two mutually opposite tooth flanks 7, 8 extending from one front side 5 to the other front side 6. The workpiece teeth 4 each comprise two mutually opposite workpiece edges 9, 10, 11, 12, designed in the present case as front edges, at the front sides 5, 6, which workpiece edges 9, 10, 11, 12 each extend between one of the front sides 5, 6 and one of the tooth flanks 7, 8 of the respective workpiece tooth 4.

[0051] The tool 1 comprises a carrier element 13 extending along a tool rotation axis AWZ and a tool element 15 forming a tool toothing 14. The carrier element 13 carries the tool element 15. The tool element 15 is removably mounted at the carrier element 13 in the present case by means of screws 16 and a mounting disk 17. The tool toothing 14 comprises a plurality of tool teeth 18, which are arranged distributed around the tool rotation axis AWZ.

[0052] At the longitudinal end opposite the tool element 15, the carrier element 13 comprises a clamping section 19 with which the tool 1 is clamped in a not shown tool holder of a not shown machine tool. Via the tool holder, the tool 1 is rotationally driven about the tool rotation axis AWZ by a not shown tool rotary drive of the machine tool.

[0053] The workpiece 2 is clamped in a not shown workpiece holder of the machine tool. Via the workpiece holder, the workpiece 2 is rotationally driven by a not shown workpiece rotary drive of the machine tool about a workpiece rotation axis AWS at least substantially parallel to the tool rotation axis AWZ and arranged centrally of the workpiece 2.

[0054] While the tool 1 and the workpiece 2 are rotated about the respective rotation axis AWZ, AWS at an at least substantially constant speed ratio, the tool toothing 14 engages in the workpiece toothing 3 in a rolling manner. In the course of this, the tool teeth 18 engage in tooth gaps 22 between the workpiece teeth 4 via a plane defined by the upper of the two front sides 20,21 of the workpiece toothing 3. The tool teeth 18 engaging in the tooth gaps 22 of the workpiece toothing 3 remove material from the workpiece 2 in the area of the upper front side 20 of the workpiece toothing 3 in a chip-removing manner.

[0055] For the sake of simplicity, the tool 1 shown and preferred in this respect comprises only one tool toothing 14, with which the front sides 20,21 of the workpiece toothing 3 can be machined one after the other if required. Alternatively, it could be provided that the tool 1 comprises two tool toothings 14 spaced apart from each other along the tool rotation axis AWZ, for example each formed by a tool element 15. Then, the different front sides 20,21 of the workpiece toothing 3 could be machined simultaneously with the tool 1.

[0056] In FIGS. 2A-B, the tool element 15 forming the tool toothing 14 is shown in a perspective view from above and in a perspective view from below. The tool element 15 comprises a mounting opening 23, with which the tool element 15 can be slid onto the carrier element 13 of the tool 1 and fastened there by means of the mounting disk 17 and the screws 16.

[0057] In the present case, the tool toothing 14 is designed as a front toothing that extends at least substantially in a plane perpendicular to the tool rotation axis AWZ. The tool teeth 18 each extend at least substantially radially to the tool rotation axis AWZ. The tool teeth 18 each comprise two opposite tooth flanks 24, 25 as well as a front side 26 arranged radially inside and a front side 27 arranged radially outside.

[0058] In the illustrated and thus preferred embodiment, the tool teeth 18 each comprise two opposite cutting edges 28,29, which are each formed in the present case by the front side 27 arranged radially outside and one of the tooth flanks 24,25 of the respective tool tooth 18. The cutting edges 28,29 each have an extension along the tool rotation axis AWZ and an extension in the circumferential direction of the tool rotation axis AWZ. In the present case, the cutting edges 28,29 extend in a common cylinder shell surface around the tool rotation axis AWZ. In the illustrated and thus preferred embodiment, the tool teeth 18 each taper continuously from the tooth base 30 in the direction of the tooth head 31 of the respective tool tooth 18. The tool teeth 18 each taper to a point in the region of the cutting edges 28,29 at the tooth head 31.

[0059] In FIG. 2C, the tool element 15 forming the tool toothing 14 is shown in a side view. In the present case, the tool teeth 18 each have an asymmetrical cross-section with respect to an axis parallel to the tool rotation axis AWZ. The tooth flanks 25 of the tool teeth 18 each have a larger tooth flank width b in the region of the cutting edges 28,29 than the opposite tooth flank 24 of the respective tool tooth 18. In the tool toothing 14 shown and preferred in this respect, the cutting edges 28 of the tool teeth 18 are arranged at a cutting edge angle of approximately 50 to the tool rotation axis AWZ. The opposite cutting edges 29 of the tool teeth 18 are arranged in the present case at a cutting edge angle of approximately 40 to the tool rotation axis AWZ. The tool teeth 18 each taper at a tooth tip angle of at least substantially 90 in the region of the cutting edges 28, 29.

[0060] FIG. 3A shows a detail of the tool 1 and the workpiece 2 in the area III shown in FIG. 1A in a perspective view. While the tool 1 and the workpiece 2 are rotated about the respective rotation axis AWZ, AWS, the workpiece edges 10 of the workpiece teeth 4 assigned to the upper front side 20 of the workpiece toothing 3 and trailing in the direction of rotation RWS of the workpiece 2 are deburred and simultaneously chamfered with the cutting edges 28 of the tool teeth 18 leading in the direction of rotation RWZ of the tool 1.

[0061] During movement of the tool teeth 18 into the tooth gaps 22 formed between the workpiece teeth 4, the cutting edges 28 leading in the direction of rotation RWZ of the tool 1 come into chip-removing contact with the workpiece edges 10 trailing in the direction of rotation RWS of the workpiece 2. While the cutting edges 28 are in chip-removing contact with the workpiece edges 10 to be machined, the cutting edges 28 are each moved from the tooth head 32 to the tooth base 33 of the respective workpiece tooth 4, so that at least substantially the entire workpiece edge 10 is deburred and chamfered.

[0062] In the area of the tooth bases 33 of the workpiece teeth 4, the contact between the tool teeth 18 and the workpiece 2 is removed. During the movement of the tool teeth 18 out of the tooth spaces 22, there is no contact between the cutting edges 29 of the tool teeth 18 trailing in the direction of rotation RWS of the tool 1 and the workpiece edges 9 of the workpiece teeth 4 assigned to the upper front side 20 of the workpiece toothing 3 and leading in the direction of rotation RWS of the workpiece 2. The workpiece edges 9 of the workpiece teeth 4 leading in the direction of rotation RWS of the workpiece 2 thus initially remain unmachined.

[0063] In the embodiment shown and preferred in this respect, with the cutting edges 28 of consecutive tool teeth 18, the workpiece edges 10 of consecutive workpiece teeth 4 are machined in a chip-removing manner. In this way, in the present case, during one rotation of the workpiece 2 about the workpiece rotation axis AWS, the workpiece edges 10 of all workpiece teeth 4 trailing in the direction of rotation RWS of the workpiece 2 are deburred and chamfered.

[0064] After the workpiece edges 10 of the workpiece teeth 4 have been deburred and chamfered with the cutting edges 28 of the tool teeth 18, the tool 1 and the workpiece 2 are rotated against each other by a small angular amount of, for example, approx. 1. In this way, the cutting edges 29 of the tool teeth 18 opposite the cutting edges 28 come into contact with the still unmachined workpiece edges 9 of the workpiece teeth 4. Thereafter, the tool 1 and the workpiece 2 are rotated about the respective rotation axis AWZ, AWS in directions of rotation opposite to the directions of rotation RWZ, RWS shown in order to deburr and chamfer the workpiece edges 9 with the cutting edges 29.

[0065] In FIG. 3B, the detail of the tool 1 and the workpiece 2 according to FIG. 3A is shown, wherein the tool 1 and the workpiece 2 are rotated against each other by a small angular amount of, for example, approx. 1 compared to the arrangement in FIG. 3A, so that the cutting edges 29 of the tool teeth 18 come into chip-removing contact with the workpiece edges 9 of the workpiece teeth 4. Compared to FIG. 3A, the tool 1 and the workpiece 2 are rotated in opposite directions of rotation RWZ, RWS about the respective rotation axis AWZ, AWS. During movement of the tool teeth 18 into the tooth spaces 22 of the workpiece toothing 3, the cutting edges 29 of the tool teeth 18 leading in the direction of rotation RWZ of the tool 1 come into chip-removing contact with the workpiece edges 9 trailing in the direction of rotation RWS of the workpiece 2. Thereafter, the cutting edges 29 being in chip-removing contact with the workpiece edge 9 to be machined in each case are moved from the tooth head 32 to the tooth base 33 of the respective workpiece tooth 4 along the workpiece edge 9 and in this way the workpiece edges 9 are deburred and chamfered. During movement of the tool teeth 18 out of the tooth gaps 22 of the workpiece toothing 3, there is no contact between the cutting edges 28 of the tool teeth 18 trailing in the direction of rotation RWS of the tool 1 and the workpiece edges 10 of the workpiece teeth 4 leading in the direction of rotation RWS of the workpiece 2.

LIST OF REFERENCE SIGNS

[0066] 1 Tool [0067] 2 Workpiece [0068] 3 Workpiece toothing [0069] 4 Workpiece tooth [0070] 5,6 Front side of a workpiece tooth [0071] 7,8 Tooth flank of a workpiece tooth [0072] 9,10,11,12 Workpiece edge [0073] 13 Carrier element [0074] 14 Tool toothing [0075] 15 Tool element [0076] 16 Screw [0077] 17 Mounting disk [0078] 18 Tool tooth [0079] 19 Clamping section [0080] 20, 21 Front side of the workpiece toothing [0081] 22 Tooth gap [0082] 23 Mounting opening [0083] 24,25 Tooth flank of a tool tooth [0084] 26,27 Front side of a tool tooth [0085] 28,29 Cutting edge [0086] 30 Tooth base of a tool tooth [0087] 31 Tooth head of a tool tooth [0088] 32 Tooth head of a workpiece tooth [0089] 33 Tooth base of a workpiece tooth [0090] AWS Workpiece rotation axis [0091] AWZ Tool rotation axis [0092] RWS Direction of rotation of the workpiece [0093] RWZ Direction of rotation of the tool [0094] b Tooth flank width [0095] Cutting edge angle [0096] Tooth tip angle