Transactions of Nanjing University of Aeronautics & Astronautics
A NURBS Fitting Optimization Method for High-Speed Five-Axis NC Machining Path Based on Curvature Smoothing Preset Point Constraint
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Abstract:
Existing curve fitting algorithms of NC machining path mainly focus on the control of fitting error， but ignore the problem that the original discrete cutter position points are not enough in the high curvature area of the tool path. It may cause a sudden change in the drive force of the feed axis， resulting in a large fluctuation in the feed speed. This paper proposes a new non-uniform rational B-spline （NURBS） curve fitting optimization method based on curvature smoothing preset point constraints. First， the short line segments generated by the CAM software are optimally divided into different segment regions， and then the curvature of the short line segments in each region is adjusted to make it smoother. Secondly， a set of characteristic points reflecting the change of the curvature of the fitted curve is constructed as the control apex of the fitted curve， and the curve is fitted using the NURBS curve fitting optimization method based on the curvature smoothing preset point constraint. Finally， the curve fitting error and curve volatility are analyzed with an example， which verifies that the method can significantly improve the curvature smoothness of the high-curvature tool path， reduce the fitting error， and improve the feed speed.
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TG659
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