Study on Embedded CNC System for NURBS Curves Method of Interpolation Arithmetic

In order to reduce the calculation amount of NURBS curves, combined with NURBS curves mathematical properties. Firstly this paper introduce on the algorithm of the NURBS curves improvement, it is the in the interpolation cycle under the condition of certain interpolation increment only and interpolation speed, by changing the interpolation increments can achieve correction curve of interpolation. Secondly, the control platform based on ARM+DSP could overcome the defects of CNC, through the design of hardware and software. Also, it realizes real-time dispatch and improves the reliability and stability. Lastly, on the basis of improvement PID numberical control arithmetic, this paper adopts Ziegler-Nichols theory to set PID parameters and uses it in embedded CNC system servo control. Also this paper users MATLAB/SIMULINk to do simulation and analyses about select. The simulation result showed that the correction by using PID controller, to servo system for real-time control, system stability improvement at the same time, response speed, feed system and raises the comprehensive performance.