Servo-controlling structure of five-axis CNC system for real-time NURBS interpolating

2nd International Conference on Design, Materials, and Manufacturing

材料科学;机械制造

Chen, Liangji^1 ; Guo, Guangsong^2 ; Li, Huiying^1

School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin

300387, China^1

School of Mechatronics Engineering, Zhengzhou University of Aeronautics, Zhengzhou

450015, China^2

关键词: 5-axis CNC systems;    Computer numerical control;    Five-axis cnc;    Machining Accuracy;    Numerical control;    NURBS (non uniform rational B spline);    Real-time interpolators;    Servo-controlling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/220/1/012041/pdf
DOI  :  10.1088/1757-899X/220/1/012041

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

NURBS (Non-Uniform Rational B-Spline) is widely used in CAD/CAM (Computer-Aided Design / Computer-Aided Manufacturing) to represent sculptured curves or surfaces. In this paper, we develop a 5-axis NURBS real-time interpolator and realize it in our developing CNC(Computer Numerical Control) system. At first, we use two NURBS curves to represent tool-tip and tool-axis path respectively. According to feedrate and Taylor series extension, servo-controlling signals of 5 axes are obtained for each interpolating cycle. Then, generation procedure of NC(Numerical Control) code with the presented method is introduced and the method how to integrate the interpolator into our developing CNC system is given. And also, the servo-controlling structure of the CNC system is introduced. Through the illustration, it has been indicated that the proposed method can enhance the machining accuracy and the spline interpolator is feasible for 5-axis CNC system.