Abstract
A trochoidal toolpath has an advantage in automated polishing owing to its multidirectional characteristic. Compared to most conventional toolpaths, a trochoidal toolpath has increased flexibility in its pattern control by involving more control parameters. In this work, the flexibility of a trochoidal toolpath has been applied in the pad-polishing of freeform surfaces using a tilted elastic disk, with global control of material removal distribution over part surfaces. Using the proposed approach, a novel mesh conformal parameterization-based algorithm is developed to simplify the complex trochoidal toolpath generation from freeform surfaces to a 2D domain, while considering mapping distortion. The material removal variation along the guide-line of the trochoidal toolpath is addressed by using optimized trochoidal step and radius, after precisely calculating the effect of overlapped toolpath trajectories. Moreover, adaptive feedrates for partitioned local regions are further proposed to address the material removal variation along the direction perpendicular to the trochoidal guide-line. Simulation and experimental studies are conducted and show that the fluctuation of removal depth can be considerably reduced with the global control of material removal distribution.
Published Version
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