This paper presents optimization of toolpath for turbine blades in vertical machining centre (VMC). Contouring operations are generally used for this purpose. Turbine blades are complex shapes and difficult to machine on CNC. Today many industries use CNC machines for production of turbo machinery components like turbine blades, impellers, rotors, propellers etc. A video, illustrating the proposed procedure is at. The experiments have been performed on a five-axis machining centre, Haas VF-2TR. Virtual and real machining shows the advantages of EVFSD with reference to the standard iso-parametric paths and several state-of-the-art VF-based methods. The tool-paths are generated by an extension of transfinite interpolation (TFI). The library includes three basic patterns: 'parallel'-zigzag, 'circular'-contour, and 'star'-radial patterns. Our second contribution is the clustering of the EVFSD using a prescribed library of templates by means of complex moments. The resulting enhanced vector field of statistically significant directions (EVFSD) is close to the original VFPD but is characterised by better continuity and regularity. The EVF keeps the high-rank vectors unchanged while extending them to unimportant regions, using a diffusion process based on a system of parabolic equations. "Generalized Gradient Vector Flow External Forces for Active Contours." Signal Processing 71 (2): 131-139) for image processing. We propose a new technique based on an enhanced vector flow (EVF), similar to the gradient flow by Xu and Prince (1998. The current methods are often unable to match such complicated VFs. However, surfaces represented by industrial formats often produce irregular non-homogeneous VFPD. Matching a five-axis toolpath and a vector field (VF) of preferred directions (VFPD) is increasingly popular in the five-axis machining industry.
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