Method for producing a sliding surface
The invention relates to a sliding surface ( 1 ), which is applied by arc spraying with the aid of a rotating tool. During the spraying process, the parameters are to be set in such a way that all the material particles are fused. The benefit of the high degree of fusion is that the sliding surface ( 1 ) can be machined by precision turning without the uncontrolled eruption of material. The rotating spraying process orientates the surface roughness on the face ( 1.2 ) of the sliding surface ( 1 ) transversally in the peripheral direction. This enables valley structures in the form of recesses ( 1.1 ) to be produced during the precision turning process, said recesses having a Peklenit factor of less than 1, achieving a high degree of flow obstruction and forming a defined oil-retaining volume.
1 . A method for producing a cylindrical sliding surface ( 1 ) with a bearing axis ( 1 . 3 ) by arc spraying of material particles of an Fe-based alloy, wherein
the sliding surface ( 1 ) is applied by a rotating spraying tool, and
the microstructure of the sliding surface ( 1 ) is oriented in the circumferential direction ( 7 ) or is oriented so as to deviate by at most 45° from the circumferential direction ( 7 ) with respect to the bearing axis ( 1 . 3 ).
2 . The method as claimed in claim 1 , wherein 95 to 100% of all the material particles to be sprayed are melted, and after the spraying operation recesses ( 1 . 1 ) or valley structures are produced in the sliding surface ( 1 ) and/or on the surface ( 1 . 2 ) by precision turning.
3 . The method as claimed in claim 1 , wherein the sliding surface ( 1 ) and the recesses ( 1 . 1 ), after the precision-turning operation, are machined by a microfinishing process, such as, for example ceramfinishing.
4 . A sliding surface ( 1 ) of a bearing, which has been applied by arc spraying to a support surface ( 2 ), the sliding surface ( 1 ) being formed from an Fe-based alloy, wherein
the sliding surface ( 1 ), in the region of a surface ( 1 . 2 ) has a valley structure formed from recesses ( 1 . 1 ),
the recesses ( 1 . 1 ) forming a flow obstacle ( 4 ) and having an orientation ( 8 ) with respect to a bearing axis ( 1 . 3 ) which deviates by at most 45° from the circumferential direction ( 7 ).
5 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 , wherein the recesses ( 1 . 1 ) form an oil-holding volume which amounts to between 0.01 and 2 mm 3 per cm 2 of surface ( 1 . 2 ).
6 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 , wherein the extent of the flow obstacle ( 4 ) formed by the surface ( 1 . 2 ) of the sliding surface ( 1 ) has a mean Peklenit factor of less than 1.
7 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 , wherein the sliding surface ( 1 ) is formed from a molybdenum-free Fe-based alloy and/or is formed from an Fe-based alloy which contains between 0.8 and 0.9% of carbon.
8 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 wherein the sliding surface ( 1 ) has a roughness of between 0.1 and 0.5 mm following the spraying and precision-turning operations.
9 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 , wherein the sliding surface ( 1 ) has a roughness value of between 0.01 and 0.03 mm following the spraying and precision-turning operations.
10 . The sliding surface ( 1 ) of a bearing as claimed in claim 4 , wherein the sliding surface ( 1 ) is designed as a running sleeve for a piston of an internal combustion engine, and the support surface ( 2 ) forms a cylinder wall of a cylinder casing.