Research On Micro Deep Hole Machining In Micro Electric Discharge With Cutting Edge Electrode

With the development of modern machinery manufacturing,traditional machining is more and more difficult to meet the requirements of precision machining and ultra-precision machining.The technology of EDM is becoming more and more mature,its cost is low and processing is simple,and there is an advantage of the manufacturing methods of non-contact in the EDM,However,the process of EDM is complicated,the actual machining efficiency is much lower than the theoretical value,and the workpiece quality can not be satisfied.Moreover,the manufacturing requirements of micro deep holes are very high,which makes it more difficult to manufacture than ordinary deep holes.Therefore,it is of great significance to conduct comprehensive research on micro deep holes and EDM.In this paper,the problems that affects normal machining are studied in the process of micro deep hole machining in EDM,the spark gap is small,the electroerosion product is not easily discharged,and although there is no mechanical contact during EDM,the reaction force generated by electrical discharges causes the long and thin electrode to bend,and it is clarified that the bending of an electrode increases with an increase of the electrode length.Firstly,the ordinary cylindrical electrode and edge cutting electrode are studied from two different states of concentricity and eccentricity.According to the fluid dynamics equation,the flow rate,flow state and flow volume of the working fluid are analyzed;Secondly,the characteristic of electrode processing mode is non-contact in the process of micro deep hole machining in EDM,according to the wedge effect of the fluid,the motion of the chamfered electrode and the common cylindrical electrode electrode during processing is analyzed.The pressure of the working fluid varies with each parameter is calculated by the methods of numerical analysis,fluid simulation is performed using Fluent software,and the simulation result is consistent with the variation of the calculation results of the pressure of the working fluid,according to the principle of wedge effect of fluid,the wedge-shaped cutting edge electrode with self-centering,self-steering and self-correcting functions is designed;Then the conditions of micro deep hole machining in EDM are studied to provide theoretical basis for the experiment scheme and design;Finally,the experiment of micro deep hole machining in EDM is carried out,ordinary cylindrical electrode and edge cutting electrode are studied in the machining efficiency,the change of the diameter of micro deep hole,and the changes in the characteristics of the surface and shape of the electrode,etc.The experimental results showed that edge cutting electrode can improve machining efficiency,but the edge of the cutting edge electrode is vulnerable to loss and turns into a cone,Therefore,the cutting edge electrodes are suitable for the occasion of improving the machining efficiency.