Adaptive Modeling of Non-rigid Assembly Orientation Processes in a Statistical CAT Simulation

J.F. Klinger, M. Bohn, F. Litwa
2015 Procedia CIRP  
One of the most common uses for Computer Aided Tolerancing (CAT) in the passenger car industry is body design, which universalized, consists of non-rigid assembly processes. There are a number of theoretical approaches to model the joining behavior of assemblies with elastic FEM approaches combined with statistical computation. On the other hand the rising complexity of today's body-in-white production chain makes simplifications inevitable when fast results for tolerance optimization are
more » ... imization are required. Multiple use-cases representing different scenarios are analyzed. The scenarios vary in the stiffness of the involved components, the joining environment and the general geometrical set-up. Comparing mass production measurement data with simulation output reveals the limits of CAT simulations in certain cases. One of those cases is where so-called geo-stations improve the dimensional output quality of assemblies compared to the single parts. To account for this phenomenon an adaptive approach to model geo-stations in different ways is presented, i.e. as an entity either provoking an additional influence of deviation or supplying geometrical correction. A matrix is used to suggest the appropriate kind of modeling depending on the deduced parameters.
doi:10.1016/j.procir.2015.04.046 fatcat:m6kclswd7nbalhr2kusfrlgqgq