THREE-DIMENSIONAL MANUFACTURING TOLERANCING "THE WORST CASE SIMULATION WITH CATIA"

This article proposes a 3D method of simulation of the defects generated by a manufacturing process, and the analysis of tolerance variation obtained compared to the functional requirements specifications. The objective of this work is to collect the whole of the defects generated by the manufacturing process, these deviations result from two independents phenomena: the positioning of the part and the machining surfaces, which cause the random displacement of the machined surfaces. In this work we consider only the geometrical defects (position and orientation of surfaces) making the assumption that the form defects are negligible. This assumption is necessary for simulation to the worst cases.