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Improved laser cutting through dynamic beam shaping

Fraunhofer IWS pursues DBS as solution approach to challenge laser beam cutting of thick metal plates. This technology is considered as add-on for the conventional laser cutting process to improve cutting speed and quality. Basic concept is a superimposition of feed rate and an additional laser beam oscillation inside the cut kerf (   • Scheme of dynamic beam shaping for laser c...  ). The implementation requires a high-dynamic 2D-scanner and the ESL2-100 modul as control unit in addition to standard cutting machine. To transfer direction-dependent oscillation pattern into a complex part geometry, it is necessary to adapt the pattern to feeding direction and velocity. The moving status is measured in intervals of 100 microseconds. During the same cycle, the ESL2-100 module provides control signals to the scanner unit, based on the previous moving status in oversampled intervals of 10 microseconds. The diversity of DBS parameters, which interact to the continuous changing cutting parameters, can be handled by the control unit in an automatic mode. The control unit adapts shape, scaling, frequency and orientation based on movement status and control algorithms. These algorithms could be defined by a data base or the operator itself.