| 摘要 |
The invention relates to a method for material-removing processing of a workpiece by means of a focused laser beam and, if applicable, a working-gas jet, both of which are guided in parallel onto the workpiece (5) through a nozzle channel (1) arranged centrally in a laser nozzle, and to a laser nozzle. According to the invention, in addition to the working gas, a removal gas is guided towards the workpiece (5) and leaves the laser nozzle at a higher exit speed than the working gas. The removal gas is guided onto the workpiece (5), but not directly onto the workpiece point to be processed, the removal gas having, in addition to a speed component in the direction of the axis of the laser radiation, a speed component which is directed tangentially to the central opening in the laser nozzle for the laser beam and the working gas. The removal gas prevents renewed accumulation of the melted or evaporated material on the workpiece. The removal gas is guided towards the workpiece surface via a plurality of additional channels (2) at an angle between 10@ and 80@, the removal gas being fed into the additional channels (2) via an annular channel (3). The laser nozzle has rotational symmetry, but not axial symmetry, with reference to the additional channels (2). <IMAGE> |
