Title: NURBS curve interpolation algorithm adaptive to the machine's kinetic characteristics

Authors: Fangyu Peng, Xubin Chen, Yong Zhou, Bin Li

Addresses: National Numerical Control System Engineering Research Center, School of Mechanical Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, Wubei, 430074, PR China. ' National Numerical Control System Engineering Research Center, School of Mechanical Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, Wubei, 430074, PR China. ' National Numerical Control System Engineering Research Center, School of Mechanical Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, Wubei, 430074, PR China. ' National Numerical Control System Engineering Research Center, School of Mechanical Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, Wubei, 430074, PR China.

Abstract: NURBS curve interpolation algorithm for high speed NC machining, which can fit diverse machine tool|s kinetic characteristics and has the function of look-ahead control, is proposed. By integrating curve geometry features and machine tool dynamic characteristics, the look-ahead control information can be obtained. The interpolating process can be divided into two phases: getting the look-ahead control information including the particular points in the curve and their suitable max feed rate, modifying the real-time interpolation feed rate all the time according to the look-ahead control information. This algorithm has advantages over others on three aspects: wide adaptation to machine tool, high profile precision, and small feed rate vibration.

Keywords: NURBS curves; machine kinetics; curvature; curve interpolation; high speed machining; NC machining; curve geometry; machine tool dynamics; look-ahead control; feed rate.

DOI: 10.1504/IJMPT.2008.019774

International Journal of Materials and Product Technology, 2008 Vol.33 No.1/2, pp.79 - 94

Published online: 30 Jul 2008 *

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