Simulation And Experimental Research On Electrode Flow-induced Vibration In Micro EDM

At present,with the development of science and technology,mems and Microsystems have been widely used and improved,which put forward higher requirements for high-performance machining of complex parts and high-precision structures.Micro edm technology has the characteristics of high precision,no cutting force and low cost,so it is widely used in practical micro machining.However,micro electrical discharge machining deep pore,frequent reaming amount is larger,taper,processing elastic problems such as difficult to discharge,the serious influence machining precision of hole,and the study of electrode oscillating effect on microporous precision is less,vortex-induced vibration of slender microelectrodes is rarely studied.On the basis of theoretical analysis and experimental research,in order to improve the machining accuracy of unidirectional punching liquid micro-hole EDM,this study proposed to eliminate the influence of fluid-induced vibration on the machining accuracy of micro-hole EDM by means of hedge fluid.The main contents are as follows:To explore the top electrode vortex-induced vibration,facilitate at the same time of late and improve operation efficiency,the length of the diameter of 0.4 mm to 3 mm long cylinder two-dimensional simplified simulation,combined with the runge kutta method,explore under different flow velocity,displacement of the motion of the cylinder on the parallel to the direction of flow and the oscillating displacement on the perpendicular to the direction of flow,Finally,the simulation results are verified by experiments,and the maximum error is controlled at 16.97%.Three-dimensional fluid-structure coupling simulation was carried out on the tool electrode of actual machining,and the study of three-dimensional fluid-structure coupling under the three factors of different diameter electrode,different length and size electrode and different flow rate was explored.The influence of fluid on the swing of solid electrode and the influence rule of electrode size on the swing were analyzed.At the same time,the influence of different diameter electrode,different length electrode and different liquid flow rate on the electrode swing under a certain machining depth,and the influence of different machining depth on the electrode swing.In order to verify the reliability of the simulation,high-speed photographic instrument was used to shoot and process the oscillations of electrodes with different lengths and sizes,diameters and flow rates in the liquid flushing state.The oscillation amplitude was obtained through matlab image data processing,and the maximum error was controlled at 15.2%.In order to explore the effect of electrode swing on micro-hole machining,micro EDM depth was carried out for different flushing flow rates,different electrode lengths,electrodes without diameter and different machining depths under the condition of unidirectional flushing and flushing respectively.The hole machining experiment,the final experimental result is the same as the simulation trend.