Diagnostics, Modeling and Simulation: Three Keys Towards Mastering the Cutting Process with Fiber, Disk and Diode Lasers

Petring, Dirk; Molitor, Thomas; Schneider, F.; Wolf, Nelson M.

doi:10.1016/j.phpro.2012.10.029

Cited by 35 publications

(6 citation statements)

References 7 publications

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“…Also, approaches transforming the physics involved into a free boundary problem were developed, making the problem computationally efficiently solvable [171,190,201]. Only very few models, however, were developed or applied onto the relatively new processes remote fusion cutting (RFC) and remote ablation cutting (RAC), mainly investigating the role of the vapor pressure, the processes' main driving force [121,156,178].…”

Section: Modellingmentioning

confidence: 99%

Advances in macro-scale laser processing

Schmidt

Zäh

et al. 2018

CIRP Annals

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Section: Modellingmentioning

confidence: 99%

Advances in macro-scale laser processing

Schmidt

Zäh

et al. 2018

CIRP Annals

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“…The assumption is supported by Petring et al [6,7] who estimate the surface temperature of the cut front to be highest near the bottom. This is in strong agreement with the experiments of Onuseit et al [8,9] who measured line emissions of iron emitted from the surface of the cut front for the CO 2 laser cutting process.…”

Section: Introductionmentioning

confidence: 83%

Local Vaporization at the Cut Front at High Laser Cutting Speeds

Bocksrocker

Berger

Keßler

et al. 2020

Lasers Manuf. Mater. Process.

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High-speed videos of the cut front and spectrometric measurements were applied to detect local vaporization on the cut front at high cutting speeds to show that with increasing feed rate, temporally short and intense flashes are generated by vaporization phenomena on the upper part of the cut front. The latter are accompanied by the emergence of an interrupted striation pattern on the surface of the cutting edge. The findings support the assumption that local vaporization at the cut front might be the cause for reduced quality of the cutting process at elevated cutting speeds. The observation of vaporization serves as a diagnostic method to anticipate a fail cut and the interrupted striation pattern.

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“…Fiber and disk lasers belong to the first generation of successful implementations and motivated important research questions in several domains. Among these research questions, understanding the reason for the severe differences in cutting performance, as compared to the established CO2 laser sources, became the most investigated topic: Mahrle and Beyer (2009) were the first to prove that these differences are related to changes in the absorption behavior in the cut front and proposed a simple two-dimensional model of the cut front to support it; Hirano and Fabbro (2012) used high-speed imaging of the cut front to support a claim about instabilities of the melt flow in the cut kerf generated by the different absorption behavior; Petring, Molitor et al (2012) used advanced modelling tools to demonstrate that in the cut kerf the multiple reflections are different and can be responsible for such instabilities. More recently, researchers are focusing not only in understanding the problem but also on strategies to solve it.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental aspects of laser cutting with elliptically polarized laser beams

Rodrigues

Duflou

2019

Journal of Materials Processing Technology

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The strong effect that beam polarization has on the performance of industrial laser cutting is well known. The linear and circular polarization states were widely investigated for CO2 lasers. These two states are, in fact, special cases of elliptically polarized laser beams. Theoretical models have predicted an optimal cutting performance for a specific ellipse ratio (b/a=0,75), but experimental validation was never reported. The main reason is that this characteristic is difficult to obtain in practice. With the technology shift towards solid state lasers, different optical solutions become available for polarization control of high power laser beams (e.g. transmissive beam retarders). This paper reports on the novel design of an elliptically polarized laser beam with a continuous control of the ellipse axes ratio. Starting with a full description of the concept, the equations describing the control of the optical elements are deduced using Jones calculus formalism. A motorized optical module has been built to transform the output of a linearly polarized laser beam into a given elliptic polarization characteristic. Beam analysis equipment was used to validate the experimental setup. Cutting experiments were realized for 2 mm thick 304 L stainless steel and compared with a simulation model. Both results show a comparable nonlinear effect on the achievable maximum cutting speed. The influence of the beam shape is also considered, revealing a strong interaction with the beam polarization. With the help of simulation tools, the applicability of such concept is investigated and, in agreement with the experimental results, the obtained output confirms that the optimal ellipse beam ratio is much closer to ⁄ =0 than anticipated in literature.

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Diagnostics, Modeling and Simulation: Three Keys Towards Mastering the Cutting Process with Fiber, Disk and Diode Lasers

Cited by 35 publications

References 7 publications

Advances in macro-scale laser processing

Advances in macro-scale laser processing

Local Vaporization at the Cut Front at High Laser Cutting Speeds

Theoretical and experimental aspects of laser cutting with elliptically polarized laser beams

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