Apparatus and method for chamfering a workpiece with internal gearing

Patent metadata

Field	Value
Publication number	US-10688575-B2
Application number	US-201816001870-A
Country	US
Kind code	B2
Filing date	Jun 6, 2018
Priority date	Jun 6, 2017
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

The present disclosure relates to an apparatus for chamfering at least one edge of the gearing at the front side of a workpiece having internal gearing comprising at least one rotatably supported workpiece holder for holding the workpiece and comprising at least one rotatably supported tool holder for holding a chamfer hob, possibly a chamfer cut hob, wherein the tool holder is arranged at an internal hob arm whose free end can be traveled by a machine axis of the apparatus at least partly into the center opening formed by the internal gearing of the workpiece.

First claim

The invention claimed is:

1. An apparatus for chamfering at least one edge of a gearing at a front side of a workpiece having internal gearing, the apparatus comprising at least one rotatably supported workpiece holder for holding the workpiece, at least one rotatably supported tool holder for holding at least one chamfer hob, at least one machine axis, and a controller for controlling the at least one machine axis, wherein the controller is configured to control the machine axis to bring the chamfer hob into engagement with the at least one edge of the gearing for chamfering the at least one edge of the gearing, wherein the tool holder is arranged at an internal hob arm, and wherein the controller is configured to control the at least one machine axis to travel a free end of the internal hob arm at least partly into a center opening formed by the internal gearing of the workpiece for chamfering the at least one edge of the gearing.

2. The apparatus of claim 1 , wherein the machine axis, via which the free end of the internal hob arm can be traveled into the center opening, does not extend into the center opening of the workpiece and is arranged above or next to the workpiece holder, and the machine axis enabling a traveling of the internal hob arm in an axial direction of the workpiece holder.

3. The apparatus of claim 1 , wherein a drivetrain extends in the internal hob arm and connects a drive arranged on a basis of the internal hob arm through the internal hob arm to the tool holder arranged at the free end of the internal hob arm, and the drivetrain having a plurality of gears that mesh with one another and are arranged along the internal hob arm and/or having a belt drive and/or a chain drive extending within the internal hob arm.

4. The apparatus of claim 1 , comprising a sensor for threading and/or meshing the chamfer hob into the internal gearing of the workpiece, the sensor being arranged at the free end of the internal hob arm below the tool holder.

5. The apparatus of claim 1 , wherein the tool holder is rotatable by 180° over a pivot axis perpendicular to its axis of rotation, with the pivot axis being arranged at the internal hob arm, and extending in parallel with a main extension of the internal hob arm, and further to enable a pivoting of a lower part of the internal hob arm together with the workpiece holder with respect to an upper part of the internal hob arm or to a connection with a mount.

6. The apparatus of claim 1 , wherein the controller is configured for an automatic control of the at least one machine axis for chamfering a first and a second edge of the gearing on upper and lower front sides of the workpiece.

7. The apparatus of claim 1 , included in a gear manufacturing machining center further including a gear cutting machine and a workpiece changer with a gear manufacturing machining of workpieces on the gear cutting machine and a chamfering of the workpieces on the apparatus of claim 1 taking place with parallel cycle times and the workpiece changer moving workpieces provided with a gearing on the gear cutting machine to the apparatus of claim 1 for chamfering.

8. The apparatus of claim 1 , wherein the controller is configured to control the at least one machine axis to bring the chamfer hob into engagement with the at least one edge of the gearing for chamfering the at least one edge of the gearing with the chamfer hob extending partly above the at least one edge in a region extending from the at least one edge to an external radius of the gearing and partly below the at least one edge in a region extending from the at least one edge to a center point of the gearing.

9. The apparatus of claim 1 , comprising a first drive for rotating the tool holder about a first axis of rotation and a second drive for rotating the workpiece holder about a second axis of rotation, wherein the controller is configured to control the first and the second drive to synchronize a rotation of the tool holder with a rotation of the workpiece holder such that cutting edges formed on teeth arranged on a circumference of the chamfer hob successively meet successive tooth gaps of the gearing of the workpiece.

10. The apparatus of claim 1 , wherein the controller is configured to control the at least one machine axis to travel the free end of the internal hob arm into the center opening such that the chamfer hob dips at least partly into the center opening to machine a first edge of the gearing on an upper side of the gearing, and to travel the tool holder through the center opening of the workpiece without contacting a geared internal surface of the internal gearing, and to bring the chamfer hob into engagement with a second edge of the gearing on a lower side of the workpiece, the geared internal surface of the internal gearing extending between the first edge and the second edge.

11. The apparatus of claim 10 , wherein the workpiece holder has a cup-shaped recess and permits a traveling of the chamfer hob below the second edge of the gearing on the lower side of the workpiece facing the cup-shaped recess, wherein the controller is configured to control the at least one machine axis such that the chamfer hob extends partly in a region below the second edge extending from the second edge to an external radius of the gearing and partly in a region above the second edge extending from the second edge to a center point of the gearing when the chamfer hob is in engagement with the second edge of the gearing for chamfering the second edge of the gearing.

12. The apparatus of claim 1 , comprising at least a first and a second tool holder for holding chamfer hobs, the controller being configured to control the at least one machine axis to bring a first chamfer hob held in the first tool holder into engagement with the first edge of the searing for chamfering the first edge and to bring a second chamfer hob held in the second tool holder into engagement with the second edge of the searing for chamfering the second edge.

13. The apparatus of claim 12 , wherein the first and the second tool holder are arranged above one another along the internal hob arm.

14. The apparatus of claim 12 , wherein the first and the second tool holder are arranged at separate internal hob arms.

15. An apparatus for chamfering at least one front-side edge of a gearing of a toothed workpiece having at least one rotatably supported workpiece holder for holding the workpiece and having at least one rotatably supported tool holder for holding at least one chamfer hob with the tool holder being travelable over at least one machine axis relative to the workpiece holder, wherein the apparatus permits a chamfering of edges of the gearing on both front sides of the workpiece by the same chamfer hob in that the chamfer hob held in the tool holder is brought into engagement with a first edge region of the gearing on a first side of the workpiece in a first radial direction with respect to an axis of rotation of the workpiece holder and, by traveling the tool holder relative to the workpiece holder, is brought into engagement with a radially oppositely disposed second edge region of gearing on a second side of the workpiece in a second radial direction with respect to the axis of rotation of the workpiece holder.

16. The apparatus of claim 15 , wherein the tool holder is arranged at a chamfer arm, with the chamfer hob held in the tool holder being accessible from two sides disposed opposite to each other with respect to a plane extending parallel to an axis of rotation of the tool holder and a main extension of an internal hob arm such that its first side can b

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Weixler Johannes

Classifications

• B23F23/06

  Chucking arrangements · CPC title

• B23F21/005

  with plural tools on a common axis · CPC title

• B23F19/102 Primary

  by milling · CPC title

• B23F23/04

  Loading {or unloading} arrangements · CPC title

• B23F19/104 Primary

  the tool being a hob · CPC title