Real-Time B-Spline Interpolator with Look-Ahead Scheme for High-Speed CNC Machine Tools

Abstract:

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NC tool paths of digital CAD models are currently generated as a set of discrete data points. The CNC interpolator must convert these points into continuous machine tool axis motions. In order to achieve high-speed and high-accuracy machining, the development of a real-time interpolation algorithm is really indispensable, which can deal with a large number of short blocks and still maintain smooth interpolation with an optimal speed. In this paper, a real-time local cubic B-spline interpolator with look-ahead scheme is proposed for consecutive micro-line blocks interpolation. First, the consecutive micro-line blocks that satisfy the bi-chord error constraints are fitted into a C1 continuous cubic B-spline curve. Second, machining dynamics and tool path contour constrains are taken into consideration. Third, local cubic B-spline interpolator with an optimal look-ahead scheme is proposed to generate the optimal speed profile. Simulation and experiment are performed in real-time environment to verify the effectiveness of the proposed method. Compared with the conventional interpolation algorithm, the proposed algorithm reduces the machining time by 70%.

Info:

Periodical:

Edited by:

Bo Zhao, Guanglin Wang, Wei Ma, Zhibo Yang and Yanyan Yan

Pages:

599-605

DOI:

10.4028/www.scientific.net/KEM.455.599

Citation:

Y. Q. Jin et al., "Real-Time B-Spline Interpolator with Look-Ahead Scheme for High-Speed CNC Machine Tools ", Key Engineering Materials, Vol. 455, pp. 599-605, 2011

Online since:

December 2010

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Price:

$35.00

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