Processing behavior and surface quality control of the engine fuel nozzle precision machining by AFM containing magnetic particles

As a flexible processing technology, the abrasive flow machining (AFM) technology can effectively finish the complex cavities and inner channels surface. In order to improve the inner surface quality of the engine fuel nozzle, optimize the ejection quality and atomization performance of the nozzle, and realize the precision machining surface of the nozzle, this paper explores the precision machining behavior and surface quality control of the nozzle by AFM containing magnetic particles through theoretical analysis, numerical simulation, and experimental research. After machining, the Ra value of inner surface roughness of the nozzle bore area was significantly improved, from the initial 0.336 μm to 0.065 μm. Based on the experimental statistical analysis, the significant factors affecting AFM were established, the optimal process combination of AFM was established, and the prediction of AFM on the inner surface of the nozzle was realized. Then, the quantitative cutting of nozzle and the quality control of AFM are realized.