论文信息 - Implementation of online NURBS curve fitting process on CNC machines

Implementation of online NURBS curve fitting process on CNC machines

The study aims to develop a method for implementing an online non-uniform rational B-spline (NURBS) curve fitting process on CNC machines for improving the quality and efficiency of machining. Conventional CAD/CAM/CNC systems usually induce some machining difficulties and limit the machining results in real applications. Therefore, some researchers have proposed various methods for improving the machining results. An online NURBS curve fitting process consists of the fetching and fitting stages for CNC machines is developed in this paper. The fetching stage fetches a block of NC code and generates motion commands for obtaining data points. The fitting stage executes the NURBS curve fitting method along with a given set of data points. Moreover, the optimal search method is designed for obtaining good results in the NURBS curve fitting process. Simulations and machining tests carried out on a vertical machining center show that the proposed approach reduces the machining time to about 23% while maintaining the machining quality for the sample test.

Syh-Shiuh Yeh | Hsin-Chuan Su | S. Yeh | Hsin-Chuan Su

[1] Les A. Piegl,et al. Biarc approximation of NURBS curves , 2002, Comput. Aided Des..

[2] Hyungjun Park,et al. Error-bounded biarc approximation of planar curves , 2004, Comput. Aided Des..

[3] Zezhong C. Chen,et al. A New High Precision Fitting Approach for NURBS Tool Paths Generation , 2005 .

[4] S. Y. Wong,et al. An optimization approach for biarc curve-fitting of B-spline curves , 1996, Comput. Aided Des..

[5] Frank S.-H. Chuang,et al. One-sided arc approximation of B-spline curves for interference-free offsetting , 1999, Comput. Aided Des..

[6] Daniel C. H. Yang,et al. Parametric interpolator versus linear interpolator for precision CNC machining , 1994, Comput. Aided Des..

[7] Moshe Shpitalni,et al. Realtime curve interpolators , 1994, Comput. Aided Des..

[8] Les A. Piegl,et al. The NURBS Book , 1995, Monographs in Visual Communication.

[9] H. Yau,et al. Reverse engineering of complex geometry using rational B-splines , 1997 .

[10] I. Ali,et al. Advanced Interpolation Techniques for N.C. Machines , 1993 .

[11] Dereck S. Meek,et al. Approximating quadratic NURBS curves by arc splines , 1993, Comput. Aided Des..

[12] Ming-Jen Kuo,et al. NURBS machining and feed rate adjustment for high-speed cutting of complex sculptured surfaces , 2001 .

[13] Les A. Piegl,et al. The NURBS book (2nd ed.) , 1997 .