Research On Multi Hole Synchronous Rotating EDM Technology Based On Low Frequency Vibration

With the development of modern industry,Micro-EDM technology is widely used in MEMS,aerospace,medical devices and other fields of equipment parts.At present,single electrode is widely used in Micro-EDM equipment to process multiple micro-holes workpiece one by one,which takes longer to process and has lower processing efficiency.In order to improve the processing efficiency of multi-micro hole workpiece,various countries have explored the technology of using array electrode to process multiple micro-holes workpiece.Although the array electrode processing technology has improved the efficiency of Micro-EDM,there are still some shortcomings such as the rapid ablation and fast loss of the array electrode,the inability to rotate the array electrode and the difficulty in the preparation of the array electrode.In order to improve the quality and efficiency of Micro-EDM,a synchronous rotating edm technology based on low frequency vibration is proposed in this paper.In order to explain.the effect of low frequency vibration and rotation motion on machining electrode in Micro-EDM,the influence mechanism of low frequency vibration and rotation motion on machining electrode in Micro-EDM was explained.The importance of simulation solution of clearance flow field in Micro-EDM is expounded,and the theoretical basis and steps of simulation solution of clearance flow field are introduced.Based on the Micro-EDM process,the three-dimensional model of the clearance flow field in Micro-EDM is established and meshed by using the selected simulation solution software.The clearance flow field with only low frequency vibration,only rotation motion and both low frequency vibration and rotation motion are simulated and the results are saved.The corresponding pressure distribution diagram,velocity distribution diagram and electroerosion product distribution diagram were obtained by processing the simulation results,and the results were compared and analyzed.In order to verify the simulation results of the clearance flow field and the advantages and disadvantages of the synchronous rotating EDM technology based on low frequency vibration,an experimental device for synchronous EDM was built.The experimental device includes the electrode rotation structure,the low frequency vibration structure of the electrode and the electrode feed back structure and other mechanical structures.The hardware circuit of the experimental device includes an independent pulse power supply and a motion control system.Through the precise control of the input and output pulse energy,the independent pulse power supply can set the charging voltage threshold of the charging capacitor and control the charging capacitor for the charging and discharging process,so as to realize the independent pulse discharge among the multiple electrodes.The motion control system realizes the rotation motion,low frequency vibration and feed back motion of the electrode through signal processing,the system also can adjust the processing parameters such as electrode speed,electrode amplitude and electrode position.The no-load test and machining test are carried out on the experimental device of EDM synchronous compound machining.The function of the experimental device achieves the desired effect,which is normal and stable.The influence of each machining parameter in micro edm was verified by single factor and variable experiment,and the optimum machining parameter of micro edm was explored by designing orthogonal experiment of three factors and three levels of machining.At the same time,single electrode array hole machining and multi-electrode array hole machining experiments were carried out and the machining time was recorded to verify the improvement of edm efficiency.