Research On Processing Law Of Micro Wire Electrical Discharging Machining

With the rapid development of Micro Electro Mechanical System (MEMS), the ultra precise and micro-fabrication technology become the most vigorous processing technology and also become important development tendency of the modern manufacturing technology. As an effective method of micro fabrication technology, micro wire electrical discharge machining (MWEDM) has achieved rapid development with its special machining method and higher ratio of performance versus price, and plays an important part in the field of miniature instrument's fabrication.First, this paper introduces the present status of WEDM and states the key technologies of MWEDM. Then the machining device of MWEDM is simply illustrated, following understanding the hardware requirements of MWEDM, the key techniques are investigated on the technological condition's hand.After studying the key technologies of MWEDM, this paper analyzes the principles of WEDM and looks into the discharging process of MWEDM. Then on the basis of the single-factor test, the machining technology rules are studied. According to the results of basic operating examination, the orthogonal experiment is designed to reveal the relationship among the electrical parameters, the gray relevance theory is used to optimize the processing parameters under the multiple process index of the MWEDM, namely optimizing the process parameters under the surface roughness and machining efficiency, and the optimized process parameters can be obtained from gray relation grade.At last, the experiments on micro complex parts techniques are carried out. Utilizing micro wire electrode with diameter 30μm, MWEDM can machine micro slot with minimum size of 36μm width, also can machine micro gear respectively with seven teeth, module 50μm, thickness 4mm, and seven teeth, module 35μm, thickness 4mm.