Method and device for fine machining a toothed workpiece, and program for controlling said device

1. Method of fine-machining of a toothed workpiece ( 12 ), using a toothed finishing tool ( 10 ), said method comprising:

meshing said toothed finishing tool with the workpiece ( 12 ) in mutual tooth engagement,

said finishing tool ( 10 ) being dressed in accordance with a dressing process in which the finishing tool ( 10 ) and a toothed dressing tool ( 11 ), in tooth engagement with each other, rotate about their respective gear axes (C 2 , C 1 ) which are arranged relative to each other at a center distance (a) different from zero and an axis-crossing angle different from zero,

characterized in that the gear axes (C 2 , C 1 ) of the finishing tool ( 10 ) and of the dressing tool ( 11 ) are arranged relative to each other in a position that is offset from the position of maximum center distance (a′) to a position of reduced center distance (a).

2. Method according to claim 1 , characterized in that the toothed contour of the finishing tool ( 10 ) is an internal toothed contour, while the toothed contour of the dressing tool ( 11 ) is an external toothed contour.

3. Method according to claim 1 , characterized in that the toothed contour of the finishing tool ( 10 ) is an external contour, while the toothed contour of the dressing tool ( 11 ) is an internal contour.

4. Method according to claim 1 characterized in that the finishing tool ( 10 ) is a ring-shaped honing tool.

5. Method according to claim 1 characterized in that the tooth thickness of the dressing tool ( 11 ), disregarding tooth trace convexities, is constant over the tooth width.

6. Method according to claim 1 characterized in that a superimposed movement component parallel to the gear axis (C 1 ) of the dressing tool ( 11 ) is added to the relative movement between the latter and the finishing tool ( 10 ).

7. Method according to claim 1 characterized in that a superimposed movement component orthogonal to the gear axis (C 1 ) of the dressing tool ( 11 ) is added to the relative movement between the latter and the finishing tool ( 10 ).

8. Method according to claim 1 characterized in that for the machining of the workpiece ( 12 ) with the dressed finishing tool ( 10 ), their respective gear axes (C 1 , C 2 ) are positioned relative to each other in such a way that their center distance (a′) is different from the center distance (a) at which the gear axis of the dressing tool ( 11 ) and the gear axis of the finishing tool ( 10 ) were positioned in the dressing process.

9. Method according claim 8 , characterized in that the workpiece ( 12 ) is machined with the dressed finishing tool ( 10 ) in a position of maximum center distance (a′) between the gear axis (C 2 ) of the finishing tool ( 10 ) and the gear axis (C 1 ) of the workpiece ( 12 ).

10. Method according to claim 8 characterized in that for the machining of the workpiece ( 12 ) the axis-crossing angle between the gear axes (C 1 , C 2 ) of the workpiece ( 12 ) and finishing tool ( 10 ) is set to a value which corresponds to the axis-crossing angle at which the gear axes (C 1 , C 2 ) of the dressing tool ( 11 ) and the finishing tool ( 10 ) were positioned in the dressing process.

11. Method according to claim 8 characterized in that for the machining of the workpiece ( 12 ), the axis-crossing angle between the gear axes (C 1 , C 2 ) of the workpiece ( 12 ) and the finishing tool ( 10 ) is set to a value which is offset relative to the axis-crossing angle at which the gear axes (C 1 , C 2 ) of the dressing tool ( 11 ) and the finishing tool ( 10 ) were positioned in the dressing process.

12. Method according to claim 8 characterized in that a movement component in the direction of the gear axes (C 1 , C 2 ) is superimposed on the relative movement between the finishing tool ( 10 ) and the workpiece ( 12 ) which are in meshing engagement with each other in the machining process.

13. Device for the fine-machining of a toothed workpiece ( 12 ), comprising a toothed finishing tool ( 10 ) that is rotatable about its gear axis (C 2 ), a toothed dressing tool ( 12 ) that is rotatable about its gear axis (C 1 ), a device to set the relative position between the gear axes (C 1 , C 2 ), and a controller device serving to control the position-setting device, characterized in that the controller device is designed with the capability to perform a setting that enables the method according to claim 1 to be executed.

14. Device according to claim 13 , characterized in that the controller device runs under the commands of a program.

15. Device according to claim 14 wherein said program comprises a software program, comprising program code to run the program-controlled controller device.