Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Computer-Aided Adaptation of Machining Paths for Laser Cutting to Workpiece Deviations



Datum: 11.12.2003


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
  • Prof. Dr.-Ing. H. Bley, Universität des Saarlandes

Usually offline-programmed machining paths for laser cutting of complex shaped parts have to be corrected manually in prototype manufacture. The correction is sometimes necessary, because the actual workpiece´s geometry differs from the nominal geometry used in offlineprogramming systems. The reasons for deviation, e.g. residual stresses or wrong clamping, are very complex and cannot be predicted exactly. In addition, the prototype parts are not clamped with the same effort like parts in serial production. The manual adaptation is very time-consuming, thereby the prototype manufacture efficiency decreases. The Dr.-Thesis therefore develops a method for computer-aided adaptation of machining paths for laser cutting to workpiece deviations. The developed method uses both features at the nominal workpiece and the actual one. The contour points are described with regard to the aforementioned features. The machining paths can be computer-aided reconstructed from elementary contour parts by applying geodesic based description of coordinates and by using graph theory. The reconstruction of machining paths on similar geometries within specified tolerances is an important basis for increasing the efficiency of 3D laser cutting and offers a good basis for further investigations.