Method for the gear manufacturing machining of a workpiece

Patent metadata

Field	Value
Publication number	US-10994352-B2
Application number	US-201815952109-A
Country	US
Kind code	B2
Filing date	Apr 12, 2018
Priority date	Apr 13, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The present disclosure relates to a method for the gear manufacturing machining of a workpiece in which a hobbing machining of the workpiece takes place to generate a gearing geometry of the workpiece, wherein the workpiece is gear manufacturing machined by gear skiving in addition to the hobbing machining.

First claim

The invention claimed is:

1. A method for gear manufacturing machining of a workpiece, comprising the steps:
hobbing machining of the workpiece to generate a gearing geometry of the workpiece, and
gear skiving of the workpiece,
wherein the hobbing machining is carried out at an axial cross angle between a hobbing tool and the workpiece in a range of 90°+/−45° and the gear skiving is carried out at an axial cross angle between a skiving tool and the workpiece in a range of +/−45°.

2. The method in accordance with claim 1 , wherein the hobbing machining and the gear skiving take place with a same gear cutting machine, wherein the hobbing machining and the gear skiving take place using a same fixture of the workpiece in a workpiece holder of the gear cutting machine and/or with a hobbing tool used for hobbing machining and a gear skiving tool used for gear skiving held in a same tool holder of the gear cutting machine and/or traveled by axes of a same machining head of the gear cutting machine at least on carrying out of the respective machining step.

3. The method in accordance with claim 2 , wherein the hobbing tool and the gear skiving tool are fixed on a same tool arbor and/or wherein the gear cutting machine has two tool holders arranged at a machining head and/or an automatic tool changer for changing between the hobbing tool and the gear skiving tool.

4. The method in accordance with claim 2 , wherein a feed movement of the hobbing tool and the gear skiving tool respectively takes place in parallel with an axis of the workpiece holder in at least one of the hobbing machining or the gear skiving, wherein a rotational movement of the workpiece holder is coupled to the feed movement and/or to a rotational movement of the tool holder.

5. The method in accordance with claim 1 , wherein a machining head of the gear cutting machine is pivoted relative to an axis of a workpiece holder between the two machining steps about a pivot axis of the machining head extending perpendicular to the axis of the workpiece holder and/or an axis of a tool holder, and
wherein the tool holder in which a tool for the hobbing machining and a tool for the gear skiving are held is shifted between the two machining steps relative to the workpiece via a slide of the machining head supporting the tool holder travelable in parallel with an axis of rotation of the tool holder and/or via two axes of movement of the machining head supporting the tool holder extending perpendicular to the pivot axis.

6. The method in accordance with claim 1 , wherein the hobbing machining takes place at a non-hardened workpiece and/or is at least used for roughing machining of a gearing from a blank of the workpiece and/or wherein the gear skiving takes place at the non-hardened workpiece and/or is at least used for a finishing of the gearing.

7. The method in accordance with claim 1 , wherein the hobbing machining and the gear skiving are used for manufacturing a same gearing, with a roughing machining for manufacturing the gearing first carried out, and following on from this a gear skiving machining for finishing the gearing is carried out at a toothed workpiece.

8. The method in accordance with claim 7 , wherein the gearing is a worm gearing.

9. The method in accordance with claim 8 , wherein the hobbing machining takes place using a disc-shaped profile cutter that rotates independently of rotational movement of a workpiece holder, with the profile cutter traveled in parallel with an axis of the workpiece holder during the hobbing machining while the workpiece is rotated about its axis such that the profile cutter generates a worm thread and/or wherein the hobbing machining takes place at an axial cross angle dependent on a lead angle of the worm gearing, with the axial cross angle approximately corresponding to the lead angle.

10. The method in accordance with claim 9 , wherein the hobbing machining is carried out at an axial cross angle between a hobbing tool and the workpiece in a range from +/−5° and +/−40°.

11. The method in accordance with claim 8 , wherein the gear skiving takes place by generating a coupling between a gear skiving tool and the workpiece and the gear skiving tool is traveled in parallel with an axis of a workpiece holder during gear skiving, with the gear skiving tool having a step cut and/or wherein the gear skiving takes place at an axial cross angle differing from 90°, with an angle of the step cut and/or the difference of the axial cross angle from 90° approximately corresponding to a lead angle.

12. The method in accordance with claim 11 , wherein the gear skiving is carried out at an axial cross angle between a hobbing tool and the workpiece in a range of 90°+/−40°.

13. The method in accordance with claim 1 , wherein the hobbing machining and the gear skiving are used for manufacturing two different gearings of the workpiece, with the hobbing machining carried out for manufacturing a first gearing and with the gear skiving carried out for manufacturing a second gearing.

14. The method in accordance with claim 13 , wherein the first and second gearings are spur gearings, in particular a shaft having at least two spur gearing arrangements arranged next to one another, having different diameters and/or wherein the first and the second gearing have an interference contour close to an end side of one of the gearings.

15. The method in accordance with claim 1 , wherein the hobbing machining takes place by a hob whose rotational movement is coupled to a rotational movement of a workpiece holder, with the hob traveled in parallel with an axis of the workpiece holder during the hobbing machining;
and/or wherein the gear skiving takes place by generating a coupling between a gear skiving tool and the workpiece and the gear skiving tool is traveled in parallel with the axis of the workpiece holder during the gear skiving.

16. A gear cutting machine comprising a workpiece holder and a tool holder that is travelable via movement axes of the gear cutting machine with respect to the workpiece holder, with the tool holder arranged at a machining head of the gear cutting machine that is travelable over the movement axes of the gear cutting machine, with the gear cutting machine having a control with software for controlling the movement axes of the gear cutting machine, the software comprising instructions for hobbing machining the workpiece to generate a gearing geometry of the workpiece and gear skiving the workpiece, wherein the hobbing machining is carried out at an axial cross angle between a hobbing tool and the workpiece in a range of 90°+/−45° and the gear skiving is carried out at an axial cross angle between a skiving tool and the workpiece in a range of +/−45°.

17. The gear cutting machine of claim 16 , wherein the machining head of the gear cutting machine having the tool holder has a pivot axis that stands perpendicular on an axis of the workpiece holder, with the pivot axis having a pivot angle of more than 90°, or wherein an axis of the tool holder is pivotable by the pivot axis of the machining head in a range from −20° to +90° relative to the axis of the workpiece holder.

18. Software for controlling a gear cutting machine, the gear cutting machine comprising a workpiece holder and a tool holder that is travelable via movement axes of the gear cutting machine with respect to the workpiece holder, with the tool holder arranged at a machining head of the gear cutting machine that is travelable over the movement axes of the gear cutting machine, the software having a function for carrying out

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Weixler Johannes
• Breith Thomas

Classifications

• B23F13/00

  Making worms by methods essentially requiring the use of machines of the gear-cutting type (making screw-thread B23G) · CPC title

• B23F1/06

  by milling · CPC title

• B23F21/005

  with plural tools on a common axis · CPC title

• B23F17/006

  using different machines or machining operations · CPC title

• B23F5/163

  the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen" · CPC title