Study On Dynamic Modeling And Experimental Investigation Of AS-EMM Based On Multiphysics

The non-smooth surface on the metal can improve the performance of the products,such as heat resistant,smooth friction performance,corrosion protection,bearing capacity,etc.It is expected to be widely used in agricultural machinery,aerospace,mechanical engineering and other fields.The air shielding electrochemical jet machining(AS-EMM)can be used for processing of micro-texture on the metal surface.The principle is to use the gas film to restrain the gap electrolyte range,change the characteristics of the electrolyte,shield the electric field,and control the electrolyte to focus on the tool.The electrode is facing the area of the workpiece so that the material dissolves in a specific area on the surface of the workpiece.The main research contents and result are as follows:(1)Based on the principle of ECM and AS-EMM,it is revealed the flow characteristics of the dynamic flow field in AS-EMM.The mechanism of multiple physical fields interaction under gas film and its influence on material removal were analyzed.And an experimental system and a mathematical model for dynamic molding evolution of AS-EMM were established,which provided theoretical and experimental basis for the following simulation and processing experiments.(2)The finite element analysis software was used to simulate the gas-liquid distribution,the electrolyte velocity,the processing potential,the machining gap,the gap conductivity and temperature in the laminar and turbulent two-phase flow in AS-EMM,which compared with EJM.And an experimental equipment for basic experimental was confirmed.The simulation results was controlled at about 17%.It was demonstrated that AS-EMM was superior to EJM.Based on the experimental research and simulation study on AS-EMM,the influences of different electrode size,machining gap,voltage and air pressure on the dynamic forming of materials were compared.(3)The technology of AS-EMM was applied to the surface of the friction pair,and the experimental study on the electrolytic machining process of AS-EMM was carried out on the surface of the friction pair.The experimental results showed that the friction coefficient of the micro grooves was reduced by 14.9% and the depth diameter ratio was increased by 31.93%.The groove structure of machining array had good consistency,accuracy and the aspect ratio.The influence of EJM and AS-EMM on the surface friction properties of the workpiece was compared and analyzed by SEM and EDS.Through the optimum experiment analysis,the micro groove array structure with the aspect ratio of the friction pair was 0.150 and the surface friction coefficient was 0.129.The research shows that the advantages of AS-EMM in micro structure machining of metal surface,which can provide reference for related research fields,and help to the promotion of micro structure processing application in industrial areas for further development.