Smooth non-uniform rational B-spline (NURBS) machining with kinematic limit for short linear segments
Set of methods based on non-uniform rational B-spline (NURBS) are proposed in this article, which are adopted to improve the smoothness during short linear numerical control (NC) codes machining. The smoothness refers to two aspects: the contour fairness of CL trajectory and the machining
stability of the machine tool. To obtain contour fairness, the optimised knots combination strategy (OKCS) is proposed in least square NURBS fitting from short linear segments, which generates NURBS curve for the next interpolating process. Sequentially, an axis-based look-ahead NURBS interpolator
(ALANI) is designed for NURBS interpolation in order to improve the machining stability according to the kinematic limit. Both OKCS and ALANI are simulated and compared with congener algorithms, respectively. Furthermore, algorithms are implemented on digital signal processor (DSP) platform,
and actual machining examples are presented at last.
Keywords: DSP; NURBS fitting; NURBS interpolation; kinematic limit; knots combination; short linear segments
Document Type: Research Article
Affiliations: The State Key Lab of Fluid Power and Mechatronic Systems,Zhejiang University, Hangzhou310027, China
Publication date: 01 December 2011
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