Method for producing grooves on a camshaft

Abstract

In a method for end processing a surface of a shaft-like workpiece, the following steps are performed in the following series, and the workpiece rotates about an axis of rotation: a) finishing the surface with a first finishing tool, b) machining the surface with a scoring tool, whereby the scoring tool produces at least one groove running in a circumferential direction, whereby the at least one groove produces 3 to 12 profiled gorges on a reference segment which reference segment has a length that is predetermined by a measuring method for roughness determination and which is extending on the surface parallel to the axis of rotation, each of said profiled gorges having a depth and width, whereby the ratio of the depth and width of each profiled gorge is greater than 2 and a distance between adjacent profiled gorges is substantially the same,
c) machining the surface with the first finishing tool or a second finishing tool.

Claims

1. A method for end processing a surface of a shaft-like workpiece, in which the following steps are performed in the sequence provided, whereby the workpiece rotates about an axis of rotation: a) finishing the surface with a first finishing tool, b) machining the surface with a scoring tool, whereby the scoring tool produces at least one groove running in a circumferential direction, whereby the at least one groove produces 3 to 12 profiled gorges on a reference segment which reference segment has a length that is predetermined by a measuring method for roughness determination and which is extending on the surface parallel to the axis of rotation, each of said profiled gorges having a depth and width, whereby the ratio of the depth and width of each profiled gorge is greater than 2 and a distance between adjacent profiled gorges is substantially the same, c) machining the surface with the first finishing tool or a second finishing tool.

2. The method according to claim 1, wherein the scoring tool does not move parallel to the axis of rotation during the rotation of the workpiece in step b).

3. The method according to claim 1, wherein in step b), the workpiece executes at least one complete rotation and the scoring tool executes at least one complete oscillation movement parallel to the axis of rotation.

4. The method according to claim 3, wherein rotation of the workpiece and movement of the scoring tool in step b) is synchronized, such that after a rotation of the workpiece about 360, the scoring tool has executed exactly one or a plurality of multiple, complete oscillation movements.

5. The method according to claim 1, wherein in step b), the workpiece performs a number of complete rotations that corresponds to the number of profiled gorges and during the rotation of the workpiece, the scoring tool executes a linear movement corresponding to the length of the reference segment parallel to the axis of rotation.

6. The method according to claim 1, wherein the scoring tool is an abrasive belt which produces the at least one groove by means of at least one large abrasive grain.

7. The method according to claim 6, wherein the at least one abrasive grain that produces the groove in its extension parallel to the axis of rotation is at least twice as large as the remaining abrasive grains of the abrasive belt.

8. The method according to claim 1, wherein the scoring tool is a finishing stone, which produces the grooves by means of at least one projection or by means of defined projections arranged with a spacing relative to one another that corresponds to the distance between the profiled gorges.

9. The method according to claim 1, wherein the scoring tool is a structural fibrous web, which produces at least one the groove by means of at least one abrasive grain or by means of multiple abrasive grains, wherein said abrasive grains are arranged with a spacing relative to one another that corresponds with the distance between the profiled gorges parallel to the axis of rotation on the fibers of the structural non-woven fabric.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following the invention is described with reference to the drawings, which only depict the invention schematically. The dimensions are only for a better understanding of the invention. The figures show:

(2) FIG. 1: an end processed workpiece and

(3) FIG. 2: a roughness profile along a reference segment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) The workpiece in FIG. 1 was end processed in such a matter, that only one single groove 2 was produced on the surface of the workpiece, which extends in a screw-shaped manner around the workpiece.

(5) A reference segment 5 extends parallel to the rotation axis of the workpiece on the surface of the workpiece. The single groove 2 cuts the reference segment 5 five times.

(6) The roughness profile of the reference segment 5 is depicted in FIG. 2. As can be seen the single groove 2 has produced five profile gorges 3 on the reference segment 5. Between two adjacent profiled gorges 3 multiple profile valleys 4 are formed. Each profiled gorge 3 has a depth 6 and a width 7. The radius of the depths and widths of each profiled gorge is greater than two. Furthermore, the distance 8 between two adjacent profiled gorges 3 is substantially the same for all profiled gorges 3.

(7) The specification incorporates by reference the disclosure of DE 102014117398.8, filed Nov. 27, 2014.

(8) The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawings, but also encompasses any modifications within the scope of the appended claims.