PDE-based spiral machining trajectory planning method without tool feed marks on 2D arrayed multi-island regions.

Components with complex arrays of multi-island structures are widely used in aerospace applications, but existing commonly used milling strategies usually have multiple feeds and retreats during machining, and the machined surfaces produce feed marks that do not meet the requirements for high-quality surfaces. In this paper, a machine path generation method for array multi-island machining regions is proposed, which divides the array multi-island region machining area into multiple double-connected regions from outside to inside, establishes a partial differential equation model in each double-connected machining subregion to compute isotherms, generates spiral machining trajectories in the double-connected subregions by identifying suitable isotherms in each double-connected machining subregion, and then connects each sub-region helix trajectory; the overall spiral machining trajectory in the array multi-island region can be obtained to avoid multiple tool feeds and feed marks on the machined surface. Meanwhile, in order to avoid the sudden change of cutting direction at the boundary of two sub-regions, an optimization algorithm for B-sample curve generation at the boundary connection of sub-regions is proposed. Finally, the superiority of the method in improving machining quality is verified by machining experiments. [ABSTRACT FROM AUTHOR]