The investigation was carried out on the technical problems of finishing the inner surface of elbow parts and the action mechanism of particles in elbow precision machining by abrasive flow. This work was analyzed and researched by combining theory, numerical and experimental methods. The direct simulation Monte Carlo (DSMC) method and the finite element analysis method were combined to reveal the random collision of particles during the precision machining of abrasive flow. Under different inlet velocity, volume fraction and abrasive particle size, the dynamic pressure and turbulence flow energy of abrasive flow in elbow were analyzed, and the machining mechanism of particles on the wall and the influence of different machining parameters on the precision machining quality of abrasive flow were obtained. The test results show the order of the influence of different parameters on the quality of abrasive flow precision machining and establish the optimal process parameters. The results of the surface morphology before and after the precision machining of the inner surface of the elbow are discussed, and the surface roughness R_a value is reduced from 1.125 µm to 0.295 µm after the precision machining of the abrasive flow. The application of DSMC method provides special insights for the development of abrasive flow technology.

对磨料流肘精密加工中肘部内表面的精加工技术及颗粒作用机理进行了研究。通过理论，数值和实验相结合的方法对这项工作进行了分析和研究。结合直接模拟蒙特卡罗（DSMC）方法和有限元分析方法，揭示了在磨料流精密加工过程中颗粒的随机碰撞。分析了在不同进口速度，体积分数和磨料粒径的情况下，弯头磨料流的动压力和湍流能，分析了磨料在壁上的加工机理以及不同加工参数对磨料精密加工质量的影响。获得了流量。试验结果表明了不同参数对磨料流精密加工质量的影响顺序，并确定了最佳工艺参数。讨论了弯头内表面精密加工前后的表面形态结果，以及表面粗糙度精加工磨料流后，R _a值从1.125 µm减小到0.295 µm。DSMC方法的应用为磨料流动技术的发展提供了特殊的见识。