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To increase the productivity for laser fusion cutting of electrical sheets, pre-baked multilayer stacks are laser-cut by using fiber lasers. In this study, the electrical sheets cut consist of the material denoted as M270-35A with an individual thickness of 0.35 mm. In a comparative study, both a 500-W single-mode fiber laser and a 1-kW multimode fiber laser are employed for the cutting process. The objective of this study is to optimize the maximum achievable cutting speed for a burr-free laser cut. The optimization is based on a design of experiments approach, extended by one-factor-at-a-time method and digital modulation of the laser source. The findings confirm that, in general, the cutting speed can be improved for a three-layer stack as compared to three single sheets, e.g., by up to 120 % for the multimode fiber laser system, while maintaining a high cutting quality. The increase of the productivity depends on the dynamic of the linear drives of the cutting machine and beam propagation characteristics of the used single-mode or multimode laser system. [ABSTRACT FROM AUTHOR]

Abstract: To obtain high quality results in laser fusion cutting, generally, a time and cost intensive optimization process has to be run. We report on a fast algorithm to optimize the laser parameters to get a burr free laser cut. The algorithm includes design of experiments and one-factor-at-a-time methods. The algorithm describes the whole optimization from the first to the optimum cut. Using a 500 W singe mode fiber laser we have optimized laser cutting of 1 mm aluminum. As a comparative study we used a 1 kW multi mode fiber laser. Our results demonstrate the potential of the optimization algorithm. [Copyright &y& Elsevier]

Abstract: We report on the optimization of laser cutting of thin Al2O3 ceramic layers using a design of experiment (DOE) approach. DOE allows to separate the most important influencing factors on the targeted cutting process, to clarify their interaction, to reduce the overall amount of parameter sets that need to be examined and to identify the optimized parameter regions, respectively. Using both, a continuous wave 500 W fiber laser and a 200W CO2 laser, we have optimized and compared the cutting of thin Al2O3 ceramic substrate layers applying a commercial DOE software. Our results demonstrate the potential of DOE to optimize laser material processes. [Copyright &y& Elsevier]