增材制造燃油喷嘴特征件磨粒流抛光研究

Study on Abrasive Flow Machining of Additive Manufacturing Fuel Nozzle Features

燃油喷嘴的增材制造在缩短制造周期、降低制造成本以及提升合格率方面具有明显优势,但是喷嘴内流道表面的光整处理成为打印工艺亟需突破的关键技术难题。对增材制造燃油喷嘴内流道特征件进行磨粒流四因素抛光试验,结果表明在本文的试验条件下,磨粒流抛光可有效去除表面黏粉、球化现象,改善表面台阶效应;通过优化计算获得了磨粒流抛光的最优工艺参数,经试验验证,喷嘴内流道表面粗糙度Ra由9.10μm降至2.70μm。

The fuel nozzle manufactured by additive manufacturing has significant advantages in shrinking production cycle, lowing cost and boosting qualified rate. However, polishing technology of additive manufacturing fuel nozzle through abrasive flow has become the vital technology that needs to be worked out promptly for additive manufacturing. This research develops a four-factor polishing experiment of abrasive flow for test pieces acquired the characteristics of internal flow path of additive manufacturing fuel nozzle. The result shows that powder adhered to surface, spheroidization effect and step-effect can be eliminated effectively and efficiently by abrasive flow polishing. The optimal process parameters of abrasive flow polishing were obtained by optimization calculation and the surface roughness Ra of the flow channel in the nozzle was reduced from 9.10μm to 2.70μm through the experiment.