Study On Mechanical Behavior And Wear Effect Of One-dimensional Vibration Mass Finishing Of Blade In Cylindrical Cavity

As the core component of an aero engine,the blade has been working in a high temperature and high pressure environment for a long time.The surface quality of the blade determines the service life and service performance of the aeroengine.As one of the surface quality improvement technologies,the mass finishing technology uses the media to produce microgrinding on the surface of the part,which can comprehensively improve the surface integrity of the part.Among them,the vibratory mass finishing has the characteristics of high processing efficiency,wide application range and good processing quality,and can be used to process aeroengine blade parts with complex configurations.This paper proposes a one-dimensional vibration mass finishing plan for the cylindrical barrel and the combined cavity of the blade after the surface defects of the blade after milling,and uses EDEM to simulate one-dimensional vibration mass finishing of aeroengine blade parts,the effectiveness of the simulation is verified through experiments,and an improved one-dimensional vibration mass finishing technology is proposed based on the simulation results,and the effect of the cavity characteristic parameters on the blade surface processing effect is simulated and analyzed.The main research contents are as follows:(1)Based on the polishing problems and machining requirements of aeroengine blades in actual machining,the polishing effect of different processes on the blade surface is compared and analyzed,and based on the good adaptability of the media to complex surfaces in the mass finishing,putting forward the one-dimensional vibration mass finishing plan for the cylindrical barrel and blade combined cavity.(2)Analyzing the influence of cavity characteristic parameters in one-dimensional vibration mass finishing on the mechanical behavior of the blade surface media by EDEM simulation.The results show that: in the one-dimensional vibration mass finishing,the flow mode of the media in different areas is different,and the particle system is divided into convection area,mixed flow area and steady flow area according to its movement characteristics;By changing the blade placement method,blade embedding depth and barrel size(length,diameter),the basic law of the blade surface media speed and the surface contact force with the independent variables is obtained,and then get the reasons that affect the effect of blade surface processing.(3)In order to further analyze the blade surface processing efficiency and surface uniformity,the influence of cavity characteristic parameters on the blade surface wear depth was analyzed through EDEM simulation,and one-dimensional vibration mass finishing experiment was carried out on the titanium alloy parts to study the part surface roughness changes under different embedding depths.The results show that by changing the blade placement method,blade embedding depth and barrel size,the efficiency and uniformity of blade surface processing can be effectively improved;Through the one-dimensional vibration mass finishing experiment,it is found that the processing efficiency and uniformity change trend of the part surface are consistent with the simulation results under different embedding depths,which verifies the accuracy of the simulation calculation.(4)Aiming at the problem of uniform and inconsistent machining in one-dimensional vibration mass finishing,an improved one-dimensional vibration mass finishing process is proposed.EDEM was used to simulate and analyze the influence of cavity characteristic parameters on the mechanical behavior of the blade surface media and the blade surface wear depth.The results show that: compared with the traditional vibratory mass finishing,the improved one-dimensional vibration mass finishing can change the spatial position of the blade in the media,which is beneficial to improve the consistency of the blade surface processing;When the spatial position of the blade changes slightly in the radial direction during the rotation,that is,the blade is located at the position of the barrel axis,the blade processing effect is better;By changing the size of the barrel,the processing effect of the blade can be improved,considering the efficiency and uniformity of the blade surface,the best parameter range of the barrel size is selected according to the simulation results: barrel length: 80～100mm,barrel diameter: 90～100mm.