Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Simulation based determination of the expected accuracy for sheet metal bending

Datum: 19.12.2002



  • Prof. Dr.-Ing. Dr.h.c. M. Geiger
  • Prof. Dr.-Ing. M. Kleiner, Universität Dortmund

The task of determining a bending stage plan for sheet metal bending has been solved with the help of computers. Efficient programs to find a possible bending stage plan as fast as possible are available. The challenge of taking into account the accuracy aspect in this search is not answered so far. This work presents a method of calculating accuracy that can be expected due to a given bending stage plan during the planning stage. To do so the many influences on accuracy in sheet metal bending which lead to unavoidable deviations are distinguished in two classes - deviations in the bending angle and deviations in the location of the bending edge. Using empiric data and a Monte-Carlo simulation system the accuracy resulting from a given bending stage plan and a given machine allocation can be calculated. Error propagation is implicitly taken into account by calculating the position of a bending edge in each manufacturing step depending on the workpiece geometry manucatured up to the manufacturing step in question. The simulation results are summarized in capability indices. This introduces a method to exploit the existing potential to increase accuracy through bending stage planning with the help of computers.