Apparatus for chamfer-machining a workpiece

Patent metadata

Field	Value
Publication number	US-11229964-B2
Application number	US-201916380572-A
Country	US
Kind code	B2
Filing date	Apr 10, 2019
Priority date	Apr 11, 2018
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

The present application relates an apparatus for chamfer-machining at least two edges of a toothed workpiece, wherein the apparatus comprises at least one workpiece spindle with a rotatably mounted workpiece holder for receiving the workpiece and a machining head movable relative to the workpiece holder via at least one axis of movement, wherein on the machining head at least one first tool spindle with a first rotatably mounted tool holder is provided for receiving at least one first chamfer milling cutter for chamfer-machining a first edge of a toothing of a workpiece received in the workpiece holder, wherein on the machining head a second tool spindle with a second rotatably mounted tool holder is provided for receiving an end milling cutter for chamfer-machining a second edge of a toothing of a workpiece received in the workpiece holder.

First claim

The invention claimed is:

1. A method for chamfer-machining at least two edges of a toothed workpiece, by means of an apparatus comprising at least one rotatably mounted workpiece holder for receiving the workpiece and a machining head movable relative to the workpiece holder via at least one axis of movement, wherein the machining head comprises at least one first rotatably mounted tool holder, wherein a first edge of a toothing of the workpiece received in the workpiece holder is chamfer-machined via a chamfer milling cutter received in the first rotatably mounted tool holder, wherein the machining head further comprises a second rotatably mounted tool holder, and a chamfer-machining of a second edge of the toothing of the workpiece received in the workpiece holder is effected via an end milling cutter received in the second tool holder;
wherein the chamfer milling cutter is a disk shaped tool having cutting teeth on a circumferential surface thereof and being mounted on a rotatable mandrel.

2. The method according to claim 1 , comprising: driving the workpiece holder and the first rotatably mounted tool holder in a synchronized way for chamfering the first edge of the toothing, wherein the workpiece holder and the first rotatably mounted tool holder are driven by generating coupling.

3. The method according to claim 1 , wherein the at least one axis of movement is a numerical control (NC) axis, the method comprising actuating the NC axis for the chamfer-machining of the second edge by a controller of the apparatus such that the end milling cutter received in the second tool holder is guided along the contour of the second edge to be machined, while the workpiece received in the rotatably mounted workpiece holder rotates about a rotatably mounted workpiece holder's axis of rotation.

4. The method according to claim 1 , wherein the at least one axis of movement is at least one first linear axis X, via which the machining head is traversable in a direction perpendicular to an axis of rotation of the rotatably mounted workpiece holder and perpendicular to an axis of rotation of the first rotatably mounted tool holder, and/or at least one second linear axis Z, via which the machining head is traversable in a direction parallel to the axis of rotation of the rotatably mounted workpiece holder, and/or wherein the machining head is pivotable about a pivot axis A that extends perpendicularly to the axis of rotation of the rotatably mounted workpiece holder and perpendicularly to the axis of rotation of the first rotatably mounted tool holder, and/or wherein the machining head is traversable via a third linear axis Y or V, which extends in a plane that is perpendicular to the first linear axis X.

5. The method according to claim 1 , wherein a threading sensor is arranged on the machining head, the method comprising: using the threading sensor both for positioning the chamfer milling cutter relative to the first edge for the chamfer-machining of the first edge and for positioning the end milling cutter relative to the second edge for the chamfer-machining of the second edge, wherein the threading sensor is a contactless threading sensor.

6. The method according to claim 1 , wherein the second rotatably mounted tool holder is arranged on the machining head via a pivot axis, the method comprising: pivoting the second rotatably mounded tool holder from a first machining position for machining a lower edge into a second machining position for machining an upper edge.

7. The method according to claim 1 , wherein an axis of rotation of the second rotatably mounted tool holder is aligned and/or can be aligned with a plane that extends perpendicularly to the axis of rotation of the workpiece holder at an angle that lies in a range between +/−45° and +/−30°.

8. The method according to claim 1 , wherein the second rotatably mounted tool holder is rigidly arranged on the machining head or only via one or more adjustment axes, the method comprising: using an adjusting arrangement for adjusting an angular position of an axis of rotation of the second tool holder relative to the machining head for adjusting a chamfering angle.

9. The method according to claim 1 , comprising: mounting a plurality of first chamfer milling cutters that includes the chamfer milling cutter jointly on a mandrel on the first rotatably mounted tool holder and chamfer-machining a plurality of first edges that includes the first edge of the toothing of the workpiece by the plurality of first chamfer milling cutters.

10. The method according to claim 1 , comprising: mounting a brush together with the chamfer milling cutter on a mandrel on the first rotatably mounted tool holder, and deburring an edge chamfer-machined by the chamfer milling cutter or the end milling cutter by the brush.

11. The method according to claim 1 , comprising: producing a chamfer only in partial areas of the second edge and/or machining of different partial areas of the second edge with different areas of the end milling cutter.

12. The method according to claim 1 , comprising: actuating axes of the apparatus for automatically chamfering the edges of the toothing of the toothed workpiece.

13. The method according to claim 1 , further comprising chamfer-machining a further workpiece comprising a plurality of toothings.

14. The method according to claim 13 , comprising: chamfer-machining at least two of the first edges of the plurality of toothings by one or more first chamfer milling cutters received in the first rotatably mounted tool holder and chamfer-machining at least one of the second edges of the plurality of toothings by the end milling cutter received in the second tool holder.

15. The method according to claim 6 , wherein the pivot axis is an adjustment axis and/or wherein adjustable stops are provided for adjusting the first and the second machining position.

16. The method according to claim 1 , wherein the second rotatably mounted tool holder is arranged on the machining head via at least one numerical control (NC) axis, and/or wherein an axis of rotation of the second rotatably mounted tool holder is driven pneumatically, hydraulically and/or electrically.

17. The method according to claim 10 , comprising: pivoting the machining head from a chamfer-machining position to a deburring position about a pivot axis A that extends perpendicularly to an axis of rotation of the workpiece holder and perpendicularly to an axis of rotation of the first rotatably mounted tool holder.

18. The method according to claim 1 , wherein the end milling cutter comprises a cylindrical or conical shape.

19. The method according to claim 1 , wherein the end milling cutter comprises a rounded head.

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Weixler Johannes

Classifications

• B23F19/107

  the tool being a fly cutter · CPC title

• B23F19/10

  Chamfering the end edges of gear teeth · CPC title

• B23F19/105 Primary

  the tool being an end mill · CPC title

• B23F19/102 Primary

  by milling · CPC title

• Y10T29/49476

  Gear tooth cutting · CPC title