Discrete Element Simulation Analysis Of Vibration Rotary Mass Finishing Based On Uniformity Of Blisk

Blisk is the core part of aero-engine,and its surface quality directly affects the service life and performance of aero-engine,so its importance for aero-engine is self-evident.The surface finishing technology of blisk in China is still in the stage of manual grinding and CNC milling,and there is a lack of related research in other fields,especially in the direction of mass finishing.In order to improve the uniformity of blisk,based on the discrete element method(DEM)and mass finishing theory,the advantages and disadvantages of rotary,vibratory and vibratory rotary mass finishing were compared,and the vibratory rotary machining was deeply analyzed to provide theoretical basis and reference for actual processing.The research contents and main achievements are as follows:(1)By using discrete element software EDEM,the advantages and disadvantages of rotary,vibratory(simulator external fixation)and vibratory(simulator internal fixation)mass finishing were compared and analyzed in terms of wear quantity,speed of abrasives and their coefficients of variation,etc.On this basis,the vibratory rotary mass finishing was proposed and simulated.The simulation results show that compared with other mass finishing,the vibratory rotary mass finishing can reduce the wear difference of simulator and the speed difference of abrasives from top to root and leading edge to trailing edge.The results show that the vibratory rotary mass finishing is better than the rotary mass finishing and vibratory mass finishing in terms of machining efficiency and machining uniformity.(2)By extracting the data of wear amount,normal force,tangential force,normal cumulative contact energy and tangential cumulative contact energy of the surface of simulator,the machining effect of abrasive on simulator under vibratory rotary machining was analyzed.According to the cumulative contact energy formula,it is inferred that tangential velocity of abrasives is greater than normal velocity.(3)In order to improve the uniformity of simulator,purposefully reduce or improve the amount of local wear on blisk surface,a flow field adjustment device is designed: diversion peninsul.By changing the distance of diversion peninsul from the blade and the width of diversion peninsula,the amount of wear in the unevenly machined area is changed.The simulation results show that diversion peninsula will reduce the wear amount at the middle position and increase the processing uniformity.The diversion peninsula can reduce the wear gap between the front and back sides.The widening of diversion peninsula will reduce the gap between the wear of the leading and trailing edges caused by the addition of the diversion peninsula,and the wear at the edge will be reduced again and the uniformity of mass finishing will be improved by adding the check rails structure.