Research On Fuzzy Jump Control For Electrical Discharge Machining

With the development of international manufacturing, mechanical products are becoming miniature and precise. Electrical Discharge Machining(EDM), as a special processing method, is widely used in mechanical manufacturing because of its advantages such as non-contact and high accuracy. However, the process environment of EDM is relatively closed and the metal debris produced in machining is difficult to remove, which seriously affect its performance of process. As an independent process of the discharge, jump control is widely used to remove debris from the gap between electrode and workpiece.In order to study the relationship between fluid flow and debris motion, a dynamic model of fluid flow processing has been established. By using the finite element simulation software, the process of fluid flow can be analyzed qualitatively and the number of debris that are removed from gap can be analyzed quantitatively. In order to meet the accuracy requirements of the fast tool movement and micro feed motion, the dual PID motion parameters are added, and the effect of different parameters is discussed. In order to improve the stability and machining efficiency of EDM, a fuzzy jump controller is designed in this dissertation and the preliminary theoretical simulation is achieved in MATLAB. Voltage deviation and the rate of deviation are used as fuzzy input. Jump height and jump period are used as fuzzy output. After that, Embedding the open loop and fuzzy jump function modules in CNC system. Eventually this dissertation has demonstrated the effectiveness of fuzzy controller.Compared with the traditional regular jump control method, the fuzzy jump method can automatically optimize jump parameters through classifying different discharge status. This controller can easily improve the machining efficiency and ensure the stability of discharge process.