Développement d'une méthodologie de génération de trajectoires d'ébauche en usinage 5 axes

The complexity of the parts to be manufactured leads to an indispensable recourse to digital media for trajectory planning such as Computer Aided Manufacturing (CAM) software. However, a real imbalance is noted between the wide range of 5-axis finishing operations currently available in CAM software and the lack of solutions for the roughing sequence, which can though improve the productivity of the overall machining process.This thesis manuscript therefore tackles the development of a simultaneous 5-axis toolpath planning methodology for the roughing sequence. Guiding curves are used to create a geometric path which allows the tool to travel the whole volume to remove, and thus ensure a maximum material removal. Guiding curves are built automatically from the numerical model of the workpiece and implemented algorithms for calculating curve and surface offsets using vector methods or scalar fields. The orientations of the tool along the guiding curves are then determined by a Sequential Quadratic Programming algorithm, according to criteria of productivity, tool behaviour, and surface quality, by searching for a specific parameterization of the guiding curves.The implementation of the 5-axis roughing strategy in the TopSolid CAM software enabled machining tests with toroidal cutter, which allowed the strategy's validation on typical parts of the aerospace industry.