HONING METHOD WITH CROSS-GRINDING FOR GEAR WHEELS

Abstract

A method for creating a surface structure on a gear wheel in a honing process, in which at least one honing tool is moved along the gear wheel in a first direction using a first crossed axes angle, and in which, subsequently, the at least one honing tool is moved along the gear wheel in a second direction, opposite to the first direction, using a second crossed axes angle, and in which the first crossed axes angle and the second crossed axes angle are chosen such that first scoring marks produced when the at least one honing tool is moved in the first direction on a surface of the gear wheel at least partially intersect, at a given angle, respective second scoring marks produced when the at least one honing tool is moved in the second direction on the surface of the gear wheel.

Claims

1-9. (canceled)

10. A method for creating a surface structure on a gear wheel in a honing process, comprising: at least one honing tool is moved along the gear wheel in a first direction using a first crossed axes angle, wherein the at least one honing tool is moved along the gear wheel in a second direction, opposite to the first direction, using a second crossed axes angle, wherein the first crossed axes angle and the second crossed axes angle are chosen such that first scoring marks produced when the at least one honing tool is moved in the first direction on a surface of the gear wheel at least partially intersect, at a given angle, respective second scoring marks produced when the at least one honing tool is moved in the second direction on the surface of the gear wheel.

11. The method as claimed in claim 10, wherein a gear honing process is chosen as the honing process.

12. The method as claimed in claim 10, wherein a power honing arrangement is used to move the honing tool along the gear wheel.

13. The method as claimed in claim 10, wherein the at least one honing tool is designed as a honing ring and is moved radially along the gear wheel.

14. The method as claimed in claim 10, wherein a cross-grinding is generated on the gear wheel.

15. The method as claimed in claim 10, wherein the scoring marks are created on an internal toothing or an external toothing of the gear wheel.

16. A gear wheel, comprising: respective teeth of the gear wheel have a surface structure with a number of first scoring marks and a number of second scoring marks, and wherein the number of first scoring marks intersects the number of second scoring marks, at least partly, at a given angle.

17. The gear wheel as claimed in claim 16, wherein the number of first scoring marks and the number of second scoring marks are arranged in a cross-grinding or cross-hatching pattern.

18. A honing machine for the power honing of a gear wheel, comprising: at least one honing tool and a controller, wherein the controller moves the at least one honing tool in a first direction along the gear wheel, and wherein the controller moves the at least one honing tool in a second direction, opposite to the first direction, along the gear wheel, and wherein the controller adjusts a crossed axes angle between the gear wheel and the at least one honing tool in dependence on a current direction of movement, such that, when the at least one honing tool is moved in the first direction, scoring marks created on a surface of the gear wheel at least partly intersect, at a given angle, respective scoring marks produced on the surface of the gear wheel during a movement of the at least one honing tool in the second direction.

Description

[0028] The invention is shown schematically with the aid of embodiments in the drawings and shall be described schematically and in detail with reference to the drawings.

[0029] FIG. 1 shows a tooth of a gear wheel with a surface structure that is created by a honing process according to the prior art.

[0030] FIG. 2 shows a tooth of a gear wheel with a surface structure that is created by a honing process according to one possible embodiment of the proposed method.

[0031] In FIG. 1, a tooth 1 of a gear wheel is shown, which has been machined by means of a honing ring in a method according to the prior art. The honing ring has been moved along the tooth 1 while maintaining a crossed axes angle between the honing ring and the tooth 1. Accordingly, a surface structure has been formed on the tooth 1 having scoring marks 3 on a top side 5 and a bottom side 7 of the tooth 1 that run substantially parallel to each other. The scoring marks 3 on the top side 5 come close to the scoring marks 3 on the bottom side 7, without intersecting them. This means that channels 9 are formed by the scoring marks 3, through which, under the action of a compressive force, such as that occurring when used in a transmission, a lubricant such as oil can slide off from the tooth 1, and accordingly the tooth is poorly protected against pressure and temperature stresses.

[0032] In FIG. 2, a tooth 20 of a gear wheel is shown that has been machined by means of a honing ring according to one possible embodiment of the proposed method. The honing ring here was moved along the tooth 20 in two directions and using two different crossed axes angles. Accordingly, a surface structure was formed on the tooth 20 having scoring marks 25 and 27, respectively, on both a top side 21 and a bottom side 23 of the tooth 20. The scoring marks 25 have been generated during a forward movement of the honing ring and using a first crossed axes angle of 20 for example. The scoring marks 27, on the other hand, have been generated during a backward movement of the honing ring, i.e., a movement of the honing ring opposite the forward movement, and using a crossed axes angle of 20, for example.

[0033] The gear wheel was moved each time in the opposite direction during the forward movement and the backward movement of the honing ring.

[0034] It is evident that the scoring marks 25 and the scoring marks 27 intersect each other, so that compartments 29 are produced, each of them being enclosed by scoring marks 25 and scoring marks 27. This means that a lubricant such as oil that has been introduced in the compartments 29 cannot easily be removed from a respective compartment 29, since the scoring marks 25 and the scoring marks 27 produce a barrier effect and hold the lubricant in the compartments 29. Accordingly, the tooth 20 of the gear wheel is protected by the lubricant even under a heavy load, such as may be expected in a transmission, for example. This means that the gear wheel can be operated with especially little wear.