Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Process Optimization and Development of Control Strategies for Laser Beam Melt Ablation

Project Status: finished


Laser ablation offers several advantages, especially in the processing of extremely hard ma-terials. Although the process of melt ablation is very simple in theory, it has a major limita-tion: with increasing ablation rate, the surface quality of the material processed declines rapidly. Depending on the process parameters, different periodic structures caused by nonlinear interactions can be observed. The analysis of the experimental data indicates a process dominated by stochastic influences. For that reason a stochastically perturbed deterministic modelling approach has been chosen. The upper layer of the melt pool is regarded as a nonlinearly oscillating membrane excited by the laser beam and perturbed by the strong stochastic effect of the processing gas stream. The melt particle is considered a mass point which is trapped in a potential well. As soon as the external force exceeds a certain threshold value, this particle escapes and an ablation event occurs.

Letztes Update: 01.01.2010