| 摘要 |
The device comprises a deflecting device (30), which passes in a plain vertically to rotation-symmetric axis of a workpiece (20) and ring- shaped around the workpiece, and optical means for beam positioning and/or focus displacement of laser beam (10). The relative movement between the workpiece and the laser beam is two and/or three dimensionally realized with a scanner. A gas stream is guided in the area between the deflecting device and the workpiece over a gas supply channel, which expands itself in the flow direction. The gas stream is emerged from the gas supply channel. The device comprises a deflecting device (30), which passes in a plain vertically to rotation-symmetric axis of a workpiece (20) and ring- shaped around the workpiece, and optical means for beam positioning and/or focus displacement of laser beam (10). The relative movement between the workpiece and the laser beam is two and/or three dimensionally realized by a scanner. A gas stream is guided in the area between the deflecting device and the workpiece over a gas supply channel, which expands itself in the flow direction. The gas stream is emerged from the gas supply channel in a variable flow angle. The gas supply channel passes over the total circumference of the deflecting device or passes above or below the deflecting device and has open and/or closed part areas. The gas supply channel is integrated into the deflecting device, which is formed in such a way that the laser beam is diverted so that it is positioned to the deflecting device on the workpiece of varying height. The deflecting device has a form of a ring-shaped conical mirror or a ring-shaped optical prism, which enables total reflection of the laser beam. A protection glass (40) is arranged between the deflecting device and the workpiece and passes in a plain vertically to the rotation-symmetrical axis of the workpiece. The protection glass is arranged above and/or below the deflecting device or above the workpiece and passes around the workpiece. The deflecting device is partially or completely surrounded by a cover having an annular-gap. An independent claim is included for a method for processing and/or welding a rotational symmetrical workpiece with laser beam. |
