软性磨粒流精密加工的仿真及实验

Simulation and experiment for softness abrasive flow processing

为改进现有磨粒流加工技术存在的缺陷,提出了软性磨粒流加工技术,并将其应用于各种微小型腔及通道的加工中。首先针对加工表面配置了相应的约束模块从而构成密封的加工流道,建立了欧拉双流体数值分析的数学模型,利用Fluent开展了流道中软性磨粒流固-液两相流动特性的分析,然后通过对工件表面进行喷漆的方法,观察了软性磨粒流的实际加工效果,并进行了相应的软性磨粒流加工试验。试验结果表明,加工表面喷漆磨损的分布比较均匀,表面细腻,体现了软性磨粒流加工的先进性与有效性。研究结果表明,实际工件表面喷漆磨损的分布与仿真中颗粒相压力的分布比较接近,这为软性磨粒流的加工提供了一种预测方法。

In order to improve the defects of abrasive flow processing,softness abrasive flow processing was put forward,and it was apphed to the processing of small cavity and channel. Collocating restraint component to the surface in order to form sealed processing flow passage, Euler double fluid model was established. Using Fluent,the characteristics of solid-liquid two-phase flow in the passage of softness abrasive flow was simulated. Spraying paint on the surface of workpiece, the softness abrasive flow processing＇s effect was observed, and the experiment was processed. Experiment results show that wear of paint is well-distributed and wear of surface is exquisite, which reflect the advancement and effectiveness of softness abrasive processing. The result indicates that distribution of spray paint＇s wear on surface is close with abrasive dynamic pressure＇s distribution in simulation, so it can predicate softness abrasive flow processing＇s effect.