Research On Large Eddy Simulation And Quality Control Technology For Abrasive Flow Precision Machining Of Internal Gear

With the continuous progress of science and technology,the manufacturing industry also has a clearer development direction,which also puts forward higher requirements for the surface accuracy of mechanical parts,such as higher processing efficiency,better processing quality and lower production cost.Traditional finishing technology is difficult to realize the finishing of parts with complex geometry,and abrasive flow machining technology can solve this problem.Combined with the characteristics of abrasive flow processing,to spur gear and helical gear in as simulation object,using large eddy simulation method,establishing of abrasive flow machining of internal gear numerical model,considering the inlet velocity,inlet pressure,abrasive concentration and the conditions of abrasive particle size four parameters,internal wall shear stress of gear internal flow,static pressure,dynamic pressure,particle velocity vector,abrasive particles distribution of pressure and flow vortex carries on the detailed analysis and discussion,by controlling the different processing parameters,reveal the different parameters under the condition of internal mechanism of abrasive flow machining of internal gear.The simulation results show that within the selected machining parameters,the larger the inlet speed and abrasive concentration,the smaller the abrasive particle size mesh,the greater the wall shear force of the spur internal gear,and the better the machining effect.The greater the inlet pressure and abrasive concentration,the greater the wall shear force and the better the surface quality of helical internal gear.In addition,taking the straight internal gear as the experimental research object,the orthogonal test table is designed to carry out the orthogonal test.The experimental results show that the abrasive flow machining technology can effectively remove the burr,pit and bulge on the tooth surface of the straight internal gear,reduce the tooth surface roughness and improve the surface quality.Range analysis and variance analysis were used to analyze the experimental data,and the optimal combination of processing parameters and the primary and secondary order of each factor were obtained.The regression equation was constructed by regression analysis method.According to the regression equation,the predicted value and the detected value were compared and analyzed to verify the effectiveness and accuracy of the model.Through numerical simulation and analysis of experimental results,the optimal process parameter combination of abrasive flow machining spur gear is obtained,and the roughness value of tooth surface under the optimal process parameter combination is 0.361?m,which verifies the effectiveness of abrasive flow machining technology for precision machining of internal gear,reveals the cutting mechanism and machining law of internal gear under different parameters,and provides theoretical support and data reference for the actual quality control of internal gear tooth surface machining.