| 摘要 |
On laser cutting machines the laser cutting head is movable relative to the laser generator, respectively relative to the workpiece to be cut, in a plane parallel to the workpiece by means of a drive controlled by a numerical control. The laser cutting head also has an adjusting device for adjusting the focal position of the laser beam, by means of which the focus can be shifted with respect to the laser cutting head perpendicular to the workpiece. The position of the laser beam focus perpendicular to the workpiece influences the cutting quality obtained, respectively the resulting cutting characteristics. A laser cutting machine which is functionally efficient under workshop conditions and suitable for automatic operation, for which a sure optical adjustment of the focal position is possible, has not been available up to now. The new laser cutting machine should eliminate this problem. For this purpose on a laser cutting machine of the type described above, the numerical control for maintaining a constant focal position perpendicular to the workpiece also controls the adjusting device for adjusting the focal position, depending on the position of the laser cutting head in its plane of motion parallel to the workpiece.
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