Thermal coating method
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsWolfgang Bluemlhuber, Wolfram Wagener
Life of this patent
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Abstract
A thermal coating method for applying a functional layer to a workpiece surface, particularly for applying a running surface coating to a cylinder running surface of a crankcase of an internal-combustion engine, includes the steps of: melting a coating material by use of a melting device, applying coating material droplets to the workpiece surface by use of a gas jet aimed at the workpiece surface, which gas jet blows coating material droplets from a melting location of the melting device onto the workpiece surface, and cooling or rapidly freezing the coating material droplets during their transport from the melting location to the workpiece surface.
Claims15
A thermal coating method for applying a running surface coating to a workpiece surface, wherein the running surface coating applied to the workpiece surface is to a cylinder running surface of a crankcase of an internal combustion engine, the method comprising the acts of:
- melting a coating material by a rotary lance;
- blowing coating material droplets from a melting location of the rotary lance onto the workpiece surface by use of a gas jet directed toward the workpiece surface in order to apply the coating material droplets to the workpiece surface;
- cooling the coating material droplets during their transport from the melting location to the workpiece surface, by providing a blow distance between the melting location and the workpiece surface between 5 mm and 200 mm such that a material droplet flying time is between 0.2 seconds and 0.5 seconds, in order to solidify 2% to 15% of a volume of the coating material droplets during the material droplet flying time so as to form the running surface coating that is porous and traversed by lamellae, fissures and occlusions and also such that after a subsequent surface treatment, pre-solidified droplets separate from the coating resulting in oil pockets greater than 0.5 mm deep.
A thermal coating method for applying a running surface coating to a workpiece surface, wherein the running surface coating applied to the workpiece surface is to a cylinder running surface of a crankcase of an internal combustion engine, the method comprising the acts of:
- melting a coating material by a rotary lance;
- blowing coating material droplets from a melting location of the rotary lance onto the workpiece surface by use of a gas jet directed toward the workpiece surface in order to apply the coating material droplets to the workpiece surface;
- cooling the coating material droplets during their transport from the melting location to the workpiece surface, by providing a blow distance between the melting location and the workpiece surface between 5 mm and 200 mm such that a material droplet flying time is between 0.2 seconds and 0.5 seconds, in order to solidify 2% to 15% of a volume of the coating material droplets during the material droplet flying time such that the cooled coating material droplets have a kinetic energy upon impacting the workpiece surface that results in the cooled coating material droplets being deformed and aligned in rows without fusing adjacent droplets, thereby forming the running surface coating that is porous and traversed by lamellae, fissures and occlusions and also such that after a subsequent surface treatment, pre-solidified droplets separate from the coating resulting in oil pockets greater than 0.5 mm deep.
Dependencies are inferred from the claim text.