Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Development of process monitored closed loop control systems for flexible forming systems



Datum: 02.09.2004


Author


Reporter

  • Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
  • Prof. Dr.-Ing. Dr. h.c. A. Weckenmann

Flexible forming processes like laser forming are using form independent tools and are thus suitable for fast and efficient product development. However, changing semi finished product properties and the lack of a forming tool lead to poor reproducibility and accuracy of the products. Thus for the industrial application a closed loop control is mandatory. Therefore process controlling methods and algorithms for the closed loop control of flexible forming processes have been developed in this thesis. Efficiency and speed of the control are important. To be able to realise a fast comparison of actual and nominal geometry, a complete surface reconstruction is not feasible. Thus the comparison is done based on significant features. The developed methods and algorithms have been implemented exemplarily for applications of laser forming. The closed loop control for the laser forming of extrusions is based on an existing technology processor. It could be applied in the field of the space frame concept. The second closed loop enables the adjustment of complex free form shapes like they can be found in the car body industry. Both closed loop controls apply the same methodology. The demonstrated successful integration of information and manufacturing technology opens new fields of application for automated flexible forming processes in the future.