METHOD AND DEVICE FOR LASER WELDING OR CUTTING WITH A DYNAMICALLY ADAPTABLE ANALYSIS REGION

摘要

The invention relates to a method and a device for welding or cutting at least one workpiece (2) by means of a laser, in which a laser beam (7) is guided along a path (10) to be welded or cut in dependence on movement data of a manipulator (3), in particular an industrial robot, and a beam directing system (6) at a distance from the workpiece (2), wherein an approximating position (14) of the path is previously established offline, to improve accuracy at least the position of a reference feature (17) of the workpiece (2) is determined online by means of an optical recording system (12) in an analysis region (15), which to increase the speed of the evaluation forms a segment of a recording region (13) of the recording system (12), a target position (19) of the path is determined on the basis of the position of the reference feature (17), the approximating position (14) is compared with the target position (19) of the path and, if there are positional deviations, the path (10) is corrected. According to the invention, to increase the immunity from errors, the size, position and/or orientation of the analysis region (15) within the recording region (13) is dynamically adapted by means of the optical recording system (12), in particular in dependence on at least one offline parameter, approximately determining the position of the reference feature (17) within the recording region (13), and/or influencing online parameter.