The core of the robustness analysis is the question: How stable is my process? Will I also meet the quality criteria if fluctuations occur in the process?

Starting from a basic simulation, a stochastic simulation is performed in the Autoform Sigma statistics module. Typical parameters that fluctuate in the forming process are the material properties (yield strength, tensile strength, elongation at break), initial sheet thickness and friction, which is taken into account by the coefficient of friction. If the fluctuation range of the input parameters is known, the stochastic simulation can predict very well within which range the result variables plate thickness or springback will change. If the fluctuation range is known, it is much easier to initiate and control appropriate measures.