In many areas of precision machining abrasive flow polishing technology has an important role. In order to study the influence of abrasive flow on the polishing effect of variable diameter parts, the fifth step variable diameter tube was taken as the research object to analyze the dynamic pressure and turbulent kinetic energy distribution of inlet velocity on the fifth-order variable diameter tube influences. Through comparative analysis, the abrasive flow polished variable diameter pipe parts have very effective and significant polishing effect and the higher the inlet speed, the more significant the polishing effect.

Solid-liquid two-phase abrasive flow machining is a method to effectively polish the surface of Special-shaped surface parts. Based on the processing characteristics of the abrasive flow machining. The standard model and the pressure-coupled SIMPLEC algorithm are used. The shear force and velocity of the near-wall surface of the runner of the solid-liquid two-phase abrasive machining with different inlet pressure are analyzed. The numerical simulation results show that the inlet pressure has little effect on the velocity, and the shear force has a linear relationship with the inlet pressure. To obtain a better polishing effect, the outlet pressure can be appropriately increased.

As the advanced technology to solve the ultra-precision machining of small hole structure parts and complex cavity parts, the abrasive grain flow processing technology has the characteristics of high efficiency, high quality and low cost. So this technology in many areas of precision machining has an important role. Based on the theory of solid-liquid two-phase flow coupling, a solid-liquid two-phase MIXTURE model is used to simulate the abrasive flow polishing process on the inner surface of U-tube, and the temperature, turbulent viscosity and turbulent dissipation rate in the process of abrasive flow machining of U-tube were compared and analyzed under different inlet pressure. In this paper, the influence of different inlet pressure on the surface quality of the workpiece during abrasive flow machining is studied and discussed, which provides a theoretical basis for the research of abrasive flow machining process.

In view of the current problems that it is difficult to polish small size and complex curved surface, a processing method based on solid-liquid two-phase abrasive flow is proposed. In order to verify the rationality and practicability of the processing method, the numerical simulation is carried out for the processing of solid-liquid two-phase abrasive flow. By using the RNG k-ε turbulence model and the Mixture model, the fuel spray nozzle is taken as the research object. The dynamic pressure, the turbulent dissipation rate and turbulent kinetic energy at the nozzle hole are analyzed and compared. The simulation results show that with the increase of inlet velocity, dynamic pressure, fluid velocity and turbulent kinetic energy at nozzle orifice increase at some extent, which tells that the effect of solid-liquid two-phase flow on the pore wall is stronger, the more intense the friction between the fluid and the wall, the better the polishing effect, thus the effectiveness of the abrasive flow processing was concluded and providing theoretical support for the fluid processing of complex components.

In order to investigate the effect of abrasive flow on the polishing effect of mutant tube parts, this paper chooses the fifth-order mutant tube parts as the research object, and the abrasive flow analyzes and analyzes the polishing process of the fifth-order mutant tube parts, and discusses the micro-Processing mechanism. Based on the analysis of the dynamic pressure, velocity and turbulence kinetic energy distribution of the fifth-order sudden change of the flow conditions, the numerical simulation results of the fifth-order abrupt change of the abrasive flow were analyzed, and the different pressure conditions of the abrasive inlet Effect of abrasive flow polishing.

In order to explore the numerical simulation of solid-liquid two-phase abrasive grain polishing and abrupt change tube, in this paper, the fourth order abrupt change tube was selected as the research object, using the fluid mechanics software to simulate, based on the theory of solid-liquid two-phase flow dynamics, study on the mechanism of AFM micromachining a workpiece during polishing. Analysis at different inlet pressures, the dynamic pressure distribution pipe mutant fourth order abrasive flow field, turbulence intensity, discuss the influence of the inlet pressure of different abrasive flow polishing effect.