METHOD FOR DRESSING OF A GRINDING WORM BY MEANS OF A DRESSING ROLL AND DRESSING ROLL

Abstract

A method for dressing a grinding worm using a dressing roll that engages the grinding worm to profile its helical grinding profile. The dressing roll is produced by: a) producing a disk-shaped base body a profiled surface for receiving a layer of abrasive particles, wherein the surface is at least partially tooth-shaped in a radial cross section, b) positioning the abrasive particles on the profiled surface, c) profiling the base body provided with abrasive particles by removing outer sections of the abrasive particles with a profiling tool so that the abrasive profile of the dressing roll is created. Production of the profiled surface takes place in step a) so that the distance between the profiled surface and the abrasive profile changes during advancing from the root region to the tip region at a flank of the tooth-shaped surface, measured in the radial cross section perpendicular to the profiled surface.

Claims

1. A method for dressing of a grinding worm by means of a dressing roll in which the dressing roll, which is provided with an abrasive profile, is brought into engagement with the grinding worm to profile its helical grinding profile, wherein the abrasive profile of the dressing roll is at least partially designed tooth-shaped in a radial cross section and extends radially from a root region to a tip region, wherein the dressing roll is produced by the steps: a) producing of a disk-shaped base body, wherein the base body is provided with a profiled surface for the reception of a layer of abrasive particles, wherein the surface is at least partially tooth-shaped in a radial cross section, b) positioning of a layer of abrasive particles on the profiled surface of the base body, c) profiling of the base body which is provided with abrasive particles by removing outer sections of the abrasive particles with a profiling tool in such a manner that the abrasive profile of the dressing roll is created, wherein the production of the profiled surface takes place according to step a) in such a manner that the distance between the profiled surface and the abrasive profile is changing during advancing from the root region to the tip region at least at one flank of the tooth-shaped surface, measured in the radial cross section perpendicular to the profiled surface.

2. A method according to claim 1, wherein the production of the profiled surface according to step a) takes place in such a manner that the distance between the profiled surface and the abrasive profile is increasing during advancing from the root region to the tip region, measured in the radial cross section perpendicular to the profiled surface.

3. A method according to claim 1, wherein the production of the profiled surface according to step a) takes place in such a manner that the distance between the profiled surface and the abrasive profile is decreasing during advancing from the root region to the tip region, measured in the radial cross section perpendicular to the profiled surface.

4. A method according to claim 2, wherein the increase or the decrease of the distance at both flanks of the tooth-shaped surface is equal.

5. A method according to claim 1, wherein the production of the profiled surface according to step a) takes place in such a manner that the distance between the profiled surface and the abrasive profile is increasing at one flank of the tooth-shaped surface and is decreasing at the other flank of the tooth-shaped surface during advancing from the root region to the tip region, measured in the radial cross section perpendicular to the profiled surface.

6. A method according to claim 1, wherein the increase or the decrease of the distance takes place linear during advancing from the root region to the tip region.

7. A method according to claim 1, wherein the increase or the decrease of the distance takes place non-linear during advancing from the root region to the tip region.

8. A method according to claim 7, wherein the increase or the decrease of the distance during advancing from the root region to the tip region takes place in such a manner that a convex design for the distance along the profiled surface is created.

9. A method according to claim 7, wherein the increase or the decrease of the distance takes place in sections linear but with different linearity.

10. A dressing roll for dressing of a grinding worm which has a disk-shaped base body with a profiled surface which is at least in sections tooth-shaped in a radial cross-section, wherein the surface extends radially from a root region to a tip region and wherein the surface is provided with a layer of abrasive particles, wherein outer end regions of the abrasive particles form an abrasive profile, wherein the abrasive particles form a surface region for forming of the abrasive profile which size is changing during advancing from the root region to the tip region.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0034] In the drawing:

[0035] FIG. 1 shows schematically the radial cross section of a dressing roll for the dressing of a grinding worm, wherein the method according to the state of the art is depicted,

[0036] FIG. 2 shows schematically the radial cross section of a dressing roll for the dressing of a grinding worm, wherein the method according to the invention and according to a first embodiment is depicted,

[0037] FIG. 3 shows in the depiction of FIG. 2 a second embodiment according to the invention,

[0038] FIG. 4 shows in the depiction of FIG. 2 a third embodiment according to the invention,

[0039] FIG. 5 shows in the depiction of FIG. 2 a fourth embodiment according to the invention and

[0040] FIG. 6 shows in the depiction of FIG. 2 a fifth embodiment according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0041] The principle of the present invention can be described by comparing FIG. 1 (solution according to the state of the art) and FIG. 2 (embodiment according to the invention):

[0042] At first a dressing roll 1 is produced by at first profiling a base body 5 (consisting of massive steel). Thereby the tooth-shaped region between the root region 3 and the tip region 4 is provided by a profiled surface 6. Then, on this surface 6 a layer of abrasive particles 7 is applied and fixed by means of a galvanically deposited material on the base body 5. The single abrasive particles 7 have substantially the same size and consequently form a layer with constant thickness along the surface 6.

[0043] At the subsequent profiling of the dressing roll 1 by means of a profiling tool 8 the outer sections 9 of the abrasive particles 7 are removed so that the required abrasive profile 2 is generated for dressing of a grinding worm.

[0044] Thereby, it is essential that said production of the profiled surface 6 takes place in such a manner that the distance x between the profiled surface 6 and the abrasive profile 2 (final profile) is changing during advancing from the root region 3 to the tip region 4 at least at one flank 10 and 11 respectively of the tooth-shaped surface 6measured in the radial cross section perpendicular to the profiled surface. This can be seen in FIG. 2 quite easy as here the exemplary straight run of the surface 6 and of the abrasive profile 2 are not parallel in the radical cross section but are arranged under an angle to another. This is not the case at the solution according to the state of the art; here, the surface 6 and the profile 2 are parallel to another.

[0045] The consequence of this process is that the cutting regions of the abrasive particles 7 have different surface regions A along the height of the tooth after the profiling of the dressing roll 1. In the embodiment according to FIG. 2 said surface region is bigger for the radial inner abrasive particles 7 than for the radial outer particles.

[0046] In the further figures variations of the embodiment according to FIG. 2 are shown.

[0047] At the solution according to FIG. 3 it is provided that also an angular run between the surface 6 and the profile 2 is given, however now the surface regions A increase when advancing in the radial outer direction (in FIG. 2 they decreased).

[0048] FIG. 4 shows that the proposed measure needs not necessarily be applied to both flanks 10 and 11 in the same manner. Rather only the flank 10 has the design according to the invention while the flank 11 is designed according to the state of the art (see FIG. 1).

[0049] In FIG. 5 it can be seen that the increase and decrease respectively of the surface region A can be oriented differently at the both flanks 10 and 11: While at the flank 10 the surface region A decreases with gaining radial distance from the axis of rotation a (see FIG. 2) it increases at the flank 11.

[0050] Finally FIG. 6 shows that the distance x between the profiled surface 6 and the abrasive profile 2 needs not necessarily increase or decrease linear. At the flank 10 a spherical (parabolic) run is provided for the distance x along the height of the tooth. At the flank 11 segmented regions are provided within which a linear run for the increase and decrease respectively for the distance x is given, however oriented inversely arranged.

[0051] It should be mentioned explicitly that the single solutions according to the embodiments of FIGS. 2 to 6 can also be employed in any combination.

[0052] While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.