Study on high quality surface finishing technology of pre-spinning nozzle in additive manufacturing

增材制造预旋喷嘴表面高质量光整技术研究

¹ School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
² AECC Shanghai Commercial Aviation Engine Manufacturing Co., Ltd, Shanghai 200241, China

Received: 4 August 2020

Abstract

Through the simulation of abrasive flow in the inner cavity of the superalloy pre-spinning nozzle made by additive manufacturing, the special abrasive polishing tool is optimized and the surface polishing technology of the inner cavity of typical structure test pieceis studied. Through comparison of the surface morphology before and after polishing, it can be concluded that the abrasive flow has a considerable removal effect on the powder sticking effect, spheroidizing effect, step effect, slag hanging phenomenon and residual support on the surface of parts, but it has a limited effect on the surface pit of the substrate. After polishing, the surface roughness of the inner cavity of parts decreasea from R_a 3.1397 μm to R_a 0.5805 μm, and the surface roughness of blade position decreases from R_a 4.8473 μm to R_a 0.3606 μm. Through the range analysis, it is found that the effect intensity of the processing parameters on the surface roughness of the parts is in order of the processing time, processing pressure and abrasive particle size.

摘要

通过进行增材制造高温合金预旋喷嘴内腔磨料流动仿真研究，优化了磨粒流抛光专用工装，开展了增材制造预旋喷嘴典型结构试验件内腔磨粒流表面光整工艺研究。通过抛光前后表面形貌对比，认为磨粒流对增材制造零件表面粘粉效应、球化效应、阶梯效应、挂渣现象以及残留支撑均有较好的去除作用，但是对基体表面凹坑内的光整效果有限，抛光后零件表面粗糙度由R_a3.139 7 μm降至R_a0.580 5 μm，叶片表面粗糙度由R_a4.847 3 μm降至R_a0.360 6 μm。通过极差分析，发现工艺参数对零件表面粗糙度的影响效果强度依次为加工时间、加工压力、磨粒粒径。