Tool-paths optimization of rapid prototyping to support product verification and collaboration

A slicing algorithm has been developed for directly slicing a CAD (Computer Aided Design) model as RP layers, and based on them closed NURBS (Non-Uniform Rational B-Spline) mathematical curves are introduced to represent the contour of each sliced layer. A tool-path algorithm has been then developed to generate mixed tool-paths with contour offset tool-paths for the boundary of a sliced layer, and zigzag tool-paths for the internal area of the layer. In addition, optimization strategies has been developed to identify the best build degree of zigzag tool-path with the minimum build time and to generate adaptive speeds for contour tool-paths for further reducing the build time. In the end, a human ear model has been used to demonstrate the performance of this research in terms of processing efficiency and surface accuracy.