Surfaces seam analysis

Abstract

We present an analysis of gap and flush defects for automotive exterior body panels. We will consider position deviations of parts and those deviations are traduced through the concept of small displacements torsor. Thus it is possible to use the model of clearances and deviations domains. This method allows modeling geometric specifications on parts (deviation domains) and clearances in joints (clearance domains). The seam analysis is made in order to verify if the tolerances are compatible with specifications. By our solving, we obtain the set of relative displacements between two parts. This set of displacements is a 6D domain (3 translations plus 3 rotations) and is not visible for the designer, thus we compute a corresponding zone on parts in order to see the results. This post processor zone is shown in a CAD environment. It is then possible to the designer to see consequences of its tolerancing choices. © 2007 Springer.