Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Laser Beam Melt Ablation - Process Analysis and Modelling



Datum: 04.08.2005


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
  • em. Prof. Dr.-Ing. Dr.-Ing. E.h. mult. H.K. Tönshoff, Universität Hannover

Despite of its numerous advantages laser beam melt ablation can still not be regarded as a competitive alternative of the material removal processes in use today. One of the main reasons for this is the lack of understanding of the process itself, which makes process control and optimisation extremely difficult. However, both of these are urgently necessary, since in the range of industrially relevant ablation rates a rapid degradation of the resulting surfaces arises. In order to gain a better understanding of the process and so to be able to develop strategies for stabilisation and improvement, the achievement of a better insight into the physics of this process has been necessary. Through the analyses performed substantial new insights could be won. For the first time the different process states of laser beam melt ablation could be identified, and also correlated with physical processes. The definition of the normalised mean amplitude opened up the possibility of process control and on-line surveillance. Beside these, the direction for the improvement of surface quality and process optimisation was pointed out theoretically and also proven practically. Thereby the conditions of industrial application could be improved substantially.