Patent ID: 6881451
Filing Date: 2005-04-19
Classification: B23K,C23C

Abstract:
1. A process for producing a wear-resistant, tribological cylinder bearing surface for a piston running in a cylinder of a crankcase of an internal-combustion engine, the process which comprises: positioning a laser such that a longitudinal axis of the laser is substantially coaxial to a cylinder of a crankcase of an internal-combustion engine; rotating the laser about the longitudinal axis of the laser and simultaneously advancing the laser in a direction of the longitudinal axis of the laser; feeding a powdery material through the laser and directing a jet of the powdery material to a cylinder bearing surface of the cylinder; deflecting a laser beam to an impact region where the jet of the powdery material impinges on the cylinder bearing surface and guiding the jet of the powdery material such that at least part of the jet of the powdery material passes through the laser beam; and at least partially melting, with the laser beam, a surface of the impact region such that the surface of the impact region is at least partially melted before the powdery material impinges on the surface of the impact region; and forming given structures in the cylinder bearing surface by using an additional laser treatment.