Study On The Control Technology Of Revolving Electric Discharge Generating Machining

Revolving Electric Discharge Generating machining (REDGM) is a new-style technology of EDM, and it's characteristic is revolving of double axes. Aiming at that actual control technology of REDGM is low-level and not all-purpose, the control technology of REDGM was studied and a universal control system of REDGM was developed in this dissertation, and this study would be of momentous current significance for raising performance and developing control theory of REDGM.At first, basing on the machining principle of REDGM, driving project of axes was analyzed, and through detecting actual rotate speed, it was fixed on that stepping motor, which divided driving, was chosen as drivers to drive axes. Through analyzing control of the shaped movements in processing, the control technology of the shaped movements, which adopted point-by-point interpolation via 3B code, was introduced. And basing on these, the control-system, which included upper PC and base singlechip control-module, was designed.In order to servo control REDGM validly, basing on the servo characteristic of REDGM and its servo method, the technique in which time was cumulated was used to detect gap discharge state, and the circuit of detecting break down was designed. And adopting the method in which including periodical detecting and local detecting of gap discharge state, the servo feed control-system based on fuzzy control technology was designed.In addition, in order to have control system to working availably, upper PC control-software and base software (singlechip control-program) were designed with the concept of module. And according to RS232 serial communication, communication agreement between upper PC and base control-module was established. And also, the upper PC control-software and the base software were developed with Visual Basic 6.0 and assembly language respectively.At last, using the homemade equipment of REDGM and control system that was designed in this dissertation, the experiments of control system and the machiningexperiment of typical part were carried out. The results show that the control system can control processing of REDGM availably, and the control system has better universal.