The quality control technology of inner surface of valve sleeve in abrasive flow machining

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 mu m. 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.