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The abrasive flow precision machining method is used to smooth the inner wall of the valve sleeve. A method to control the quality of the inner surface of the valve sleeve for precision machining by the abrasive flow was established. Through the method of large eddy simulation and a reasonable sub-grid model, the processing pressure and abrasive particle size are selected to perform numerical simulation analysis on the inner surface of the abrasive flow processing valve sleeve to predict the material removal efficiency and surface processing quality. Analyze the influence of wall shear force, dynamic pressure, particle pressure, and the existence of vortex on particle flow under different processing pressures and particle sizes. The mechanism of precision machining of the inner wall surface of the valve sleeve by abrasive flow is obtained. The experiment of abrasive flow precision machining was carried out by response surface methodology. The results show that the processing pressure and the number of abrasive mesh have a significant impact on the abrasive flow processing. Through the quadratic response surface plot and contour plot, it is found that the roughness has a minimum point and the best process parameters are obtained. The inner wall surface roughness value of the valve sleeve after precision machining by an abrasive flow can reach 0.218 μm. Finally, the roughness prediction model is established by the method of variance analysis, and the quality control method of the inner wall surface of the valve sleeve is obtained by abrasive flow processing. [ABSTRACT FROM AUTHOR]

The abrasive flow precision machining technology was used to carry out numerical simulation and experimental research for the special-shaped deep holes. A large-eddy simulation method was used to numerically analyze the titanium alloy shaped hole parts, and related experimental studies were conducted to reveal the creation mechanism of the surface of the abrasive flow machining special-shaped curved surfaces. The study finds that: the effects of dynamic pressure, velocity, the pressure of abrasive particles on wall surfaces and the effects wall shear force on wall surfaces were revealed through numerical analysis of precision machining of abrasive flow. The vortex position distribution and the cause of the vortex as well as the interaction relationship between the vortex and the abrasive particles in the flow directional sections of the special-shaped section holes were obtained; After precision machining by abrasive flow, the surface roughness of special-shaped curved surfaces improves from Ra=7.136 µm, Rz=40.103 µm to Ra=1.822 µm, Rz=8.964 µm respectively. The protrusions and spheroidization on the inner surfaces of the shaped holes are removed, and the surface quality is significantly improved. The vortex greatly improves the surface quality of the special-shaped curved surfaces. [ABSTRACT FROM AUTHOR]

Although abrasive flow technology is a non-conventional approach to finishing in precision machining, it offers particular advantages when machining micro-hole workpieces. This paper combines theoretical, numerical, and experimental methods to study the use of abrasive flow technology in this way. The nature of the collision of abrasive particles with a workpiece is analyzed to reveal the exact mechanisms involved in removing material using an abrasive flow. The experimental results show the importance of the plowing effect of the abrasive grains on the surface of the workpiece. The results are discussed in relation to the surface morphology of the workpiece before and after the application of the abrasive flow. After abrasive flow machining the surface roughness values were greatly reduced, achieving measures of between 0.418 and 0.285 μm in some areas. It is concluded that abrasive flow technology holds great promise for the production of high-quality workpiece surfaces in precision engineering. The results of this research offer particular insights for the further development of abrasive flow technology. [ABSTRACT FROM AUTHOR]