Cutter slotted interpolation algorithm for DSP based on Matlab / Simulink

HUANG Shao-qing， ZHENG Zhong-qian， LI Di， WANG Shi-yong
（School of Mechanical and Automotive Engineering， South China University of Technology，
Guangzhou 510640， China）

Abstract： Aiming at the difficulties of editing， debugging the interpolation code directly in DSP and confirm correctness of the code， a method to develop the cutter slotted interpolation algorithm for DSP by using code mixed programming was proposed. Firstly， the interpolation algorithm was modeled by using Matlab/Simulink tool， The planning of locus and velocity of the interpolation motion was simulated while the algorithm was designed. After the desired effect was achieved， the real-time code was generated and transplanted to DSP automatically through RTW， so the seamless transition from Matlab code to DSP code was realized. The process of grinding the spiral groove of PCB miniature milling cutters needs two linked shafts to implement interpolation， and the spiral trajectory was interpolated when one axis rotates and the other feeds along the lead direction at the same time. The algorithm was utilized in the process of grinding the spiral groove by a simple transformation. After the milling cutter was produced， its shape and size were tested and their precision can meet the processing requirements. The experimental results show that the method can solve the difficulties of editing and debugging the interpolation code directly in DSP. It has a high practical value.
Key words： printed circuit board（PCB）；interpolation algorithm； digital signal processing（DSP）； Matlab； Simulink； modeling and emulation；automatic code generation