Abstract
NURBS (non-uniform rational B-spline) interpolation algorithms have been provided in modern CNC (computer numerical control) systems. However, most of them focus on a constant feed speed without considering the contour accuracy. In order to deal with this problem, an adaptive feed speed interpolation algorithm for 3D NURBS parametric curves with confined chord errors is proposed. When the instantaneous radius of the curvature is small enough, the proposed interpolation algorithm automatically reduces the feed speed to meet the specified chord error. In the other situation it uses the second-order Taylor’s expansions approximation interpolation algorithm to obtain a constant feed speed so that the contour accuracy in the CNC system is guaranteed. Experimental results were provided to verify the feasibility and precision of the proposed interpolation algorithm.
Similar content being viewed by others
References
Zhang Q G, Greenway R B, Development and implementation of a NURBS curve motion interpolator, Robotics and Computer-Integrated Manufacturing, 1998, 14: 27–36
Shpitalni M, Koren Y, Lo C C, Real time curve interpolators, Computer-Aided Design, 1994, 26(11): 832–838
Tikhon M, Koren T J, Lee S H, Kim H S, NURBS interpolator for constant material removal rate in open NC machine tools, Machine Tools & Manufacture, 2004, 44: 237–245
Cheng M Y, Tsai M C, Kuo J C, Real-time NURBS command generators for CNC servo controllers, Machine Tools & Manufacture, 2002, 42: 801–813
Yang D C, Kong T, Parametric interpolator versus linear interpolator for precision CNC machining, Computer-Aided Design, 1994, 26(3): 225–233
Bedi S, Ali I, Quan N, Advanced interpolation techniques for NC machines, Transactions of ASME, Journal of Engineering for Industry, 1993, 115(8): 329–336
Yeh S S, Hsu P L, The speed-controlled interpolator for machining parametric curves, Computer-Aided Design, 1999, 31: 349–357
Yong T, Narayanaswami Ra, A parametric interpolator with confined chord errors, acceleration and deceleration for NC machining, Computer-Aided Design, 2003, 35: 1 249–1 259
Yeh S S, Hsu P L, Adaptive-feed speed interpolation for parametric curves with a confined chord error, Computer— Aided Design, 2002, 34: 229–237
Piegl L A, On NURBS: a survey, IEEE Computer Graphics & Application, 1991, 11(1): 55–71
Zhu Xinxiong, Modeling Technology for Free Curve and Surface, Beijing: Science Press, 2000 (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Additional information
__________
Translated from Computer Integrated Manufacturing System, 2006, 12 (3) (in Chinese)
Rights and permissions
About this article
Cite this article
Liang, Hb., Wang, Yz. & Li, X. Implementation of an adaptive feed speed 3D NURBS interpolation algorithm. Front. Mech. Eng. China 1, 403–408 (2006). https://doi.org/10.1007/s11465-006-0047-6
Issue Date:
DOI: https://doi.org/10.1007/s11465-006-0047-6