Simulating Analysis And Feasibility Research Of Aero-impeller In Abrasive Flow Machining

High quality of the integral impeller surface has important influence on compressed efficiency, thermal conductivity and thrust weight ratio. However, the impeller channel is narrow, the cascades is thin and bending large, accessibility of tool is poor, and the material is difficult to cut. It’s hard to realize the orderly-control of impeller surface texture and obtain uniform surface roughness during the process. In view of the problems such as the low machining efficiency and low degree of automation, weak theoretical basis, and no abrasive suitable for air impeller processing problems, we developed a novel technique-RAFM, aiming to find a solution for the integral impellers, compound new medium, analysis the related numerical simulation and study processing test, main job description is as follows:(1) To improve production efficiency、automaticity and uniform process ability, the mechanism of material removal in the process and material removal model was discussed using the theory of particle collision and multiphase flow theory in this paper, and rotary abrasive flow machining technology solutions was proposed to suit integral impeller finishing. A single blade passage flow dynamics characteristic was analyzed and the relationship between characteristics of abrasive medium and impeller surface machining quality was revealed in this paper. Numerical simulation results show that the abrasive medium viscosity is1kg/m.s, rotating speed is300r/min, pressure surface and suction surface flow-field is the most uniform, can be expected to achieve uniformity of the blade on both sides for processing, providing theoretical basis for abrasive preparation and processing.(2)According to the results of the simulation analysis, for the surface of different roughness values, definite the types of polymer matrix and the kinds of grits and proportion, then add the different components of additive to improve the abrasive medium processing performance and meet abrasive medium machining of viscoelastic and not adhesion of work piece surface requirements. By related experimental research on abrasive medium with the temperature change trend, puts forward the necessity of maintaining abrasive medium processing thermal stability and solution to achieve the process of abrasive performance consistency.(3) According to the results of the rotating abrasive flow processing and analysis, use the new type abrasive on different initial roughness of the surface processing and experimental study. Simulation and experimental results show that AFM method in aero-impeller has a broad application prospect, and it’s effective and feasible, could be further studied.