Method for producing a sliding surface on a machine element

Patent metadata

Field	Value
Publication number	US-2017348797-A1
Application number	US-201615538091-A
Country	US
Kind code	A1
Filing date	Jan 11, 2016
Priority date	Jan 14, 2015
Publication date	Dec 7, 2017
Grant date	—

Abstract

The invention relates to a method for producing a sliding surface on a machine element, in particular a cam follower, wherein the machine element is first provided with a coating on at least part of the surface of the machine element, into which coating a surface structure is then introduced by laser structuring. In order to be able to introduce a surface structure that does not penetrate the coating even in the case of low layer thicknesses (s 1 ) of the coating, the introduction of the surface structure is performed by laser interference structuring.

First claim

1 . A method for producing a sliding surface on a machine element, wherein the sliding surface of the machine element is provided for sliding use in contact with at least one additional machine element that is adapted to slide over the sliding surface in a sliding direction (GR), the method comprising: providing the machine element on at least one part of a surface thereof initially with a coating, forming a surface structure thereon by laser interference structuring, such that the formed surface structure when viewed perpendicular to a coating surface of the coating, comprises a number of closed structure elements.

2 . The method according to claim 1 , wherein each said closed structure, viewed perpendicular to the coating surface, is constructed in a surface extent of maximum 10% of the sliding surface.

3 . The method according to claim 1 , further comprising forming the closed structure elements in a linear construction as linear sections or point-shaped as cavities.

4 . The method according to claim 1 , wherein the coating surface is divided into two halves that extend parallel to the sliding direction (GR) by a virtual center line and the method further comprises orienting said closed structure elements in the form of linear sections at an angle Y≠0 relative to the virtual center line.

5 . The method according to claim 4 , further comprising forming every two of said linear structure elements in a V-shaped structure, with a tip of said V-shaped structure arranged pointing in the sliding direction (GR).

6 . The method according to claim 1 , wherein a ratio of a structure depth (s 2 ) of the formed surface structure to a layer thickness (s 1 ) of the coating is 0.5.

7 . The method according to claim 1 , wherein a CrNi layer or a layer made from amorphous carbon is deposited as the coating.

8 . The method according to claim 1 , wherein the sliding surface is a surface of a cam follower.

9 . The method according to claim 1 , wherein the surface structure has a non-uniform construction.

10 . The method according to claim 1 , wherein a number of the structure elements of the surface structure is greater in areas of the sliding surface the higher a sliding speed of the at least one additional machine element is in said area of the sliding surface.

11 . A machine element comprising at least one sliding surface produced according to the method of claim 1 .

12 . The machine element according to claim 11 , wherein the coating of the at least one sliding surface has a layer thickness (s 1 ) of 0.05 to 6 μm in which the surface structure is formed with a structure depth (s 2 ) of 0.15 to 0.4 μm.

13 . A sliding contact comprising a machine element according to claim 1 and at least one additional machine element, wherein the sliding surface of the machine element is provided for sliding use in contact with the at least one additional machine element, and the at least one additional machine element is provided for sliding over the sliding surface in a sliding direction (GR), and the sliding surface is provided with an overall liquid lubricant.

Assignees

• Schaeffler Technologies Ag

Inventors

• Patzold Holger

Classifications

• F01L2303/00

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• F01L2810/02

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• B23K26/359

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• F01L1/18 Primary

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• C23C14/5873

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