Research on quality analysis of solid-liquid two-phase abrasive flow precision machining based on different sub-grid scale models

In the traditional precision and ultra-precision machining technology field, workpieces with irregular internal curved surfaces tend to have no subsequent processing after basic machining due to the limited processing means, and the surface quality of such workpieces is often not up to standard. Precision machining of abrasive flow can effectively improve this drawback and improve the surface quality of the irregular inner curved surface. In order to propose the quality control technology of the precision machining of the irregular inner curved surface of the abrasive flow, this paper uses large eddy simulation method as research means, analyzes the precision machining mechanism of abrasive flow machining curved flow channel workpiece by four different sub-grid models, establishes a reasonable sub-grid-scale model, and analyzes the abrasive flow precision machining mechanism of spiral flow channel with this model. It is found that shear force increases with the increase of inlet pressure, the interaction effect of particles in the abrasive flow and the wall surface of the flow channel is enhanced, the turbulence and disorder effect of the fluid is improved, burrs and scratches on the surface are effectively removed, and the surface quality of the workpiece is improved. The greater the inlet pressure, the stronger the turbulence effect and the higher the processing efficiency of the abrasive flow, and the better the precision machining quality of abrasive flow. Properly increasing the inlet pressure can obtain a higher surface quality of the irregular inner curved surface workpiece.