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Modelling for self-optimization in laser cutting

: Hermanns, T.; Thombansen, U.; Stoyanov, S.


Simos, T. ; American Institute of Physics -AIP-, New York:
12th International Conference of Numerical Analysis and Applied Mathematics, ICNAAM 2014 : 22-28 September 2014, Rhodes, Greece
Woodbury, N.Y.: AIP, 2015 (AIP Conference Proceedings 1648)
ISBN: 978-0-7354-1287-3
Art. 710003
International Conference of Numerical Analysis and Applied Mathematics (ICNAAM) <12, 2014, Rhodes>
Fraunhofer ILT ()

Manufacturing of parts by laser cutting is widely accepted in industry. In the market there are systems which are highly focused on special applications like robot based 3D cutting but there are also general purpose machines which cut a variety of metal sheets at different thicknesses. Most of these machines use a melt based cutting process where the material is molten and ejected by an assist gas. Quality of the laser cut part is determined by a dross free cut with minimal roughness on the cut faces after all standardized properties have to be fulfilled. To ensure this level of quality, several process parameters have to be kept at the right values and within defined tolerances. The most important one is the focal position which cannot be detected during processing. In this context, the transient behavior of the focal position due to thermal heating of optical elements is a challenging problem. In this paper, a process model is developed which allows the determination of the focal position by an experimentally accessible surrogate criterion. The theoretical predictions are compared with experimental results and a concept for an active focus control is discussed.