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 Ra 3.1397 μm to Ra 0.5805 μm, and the surface roughness of blade position decreases from Ra 4.8473 μm to Ra 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.
Highlights
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
The surface roughness of the inner cavity of parts decreasea from Ra 3.1397 μm to Ra 0.5805 μm, and the surface roughness of blade position decreases from Ra 4.8473 μm to Ra 0.3606 μm
Summary
刘维伟1, 吕谦1, 雷力明2, 侯彦昊1, 石磊2 (1.西北工业大学 机电学院, 陕西 西安 710072; 2.中国航发上海商用航空发动机制造有限责任公司, 上海 200241) 分析可知,增加进口压力可有效提升材料去除 率,但在实际应用中,应避免加工压力过大带来的工 件变形以及过抛的问题。 设置进口压力为 8 MPa, 磨料浓度 80%,磨粒粒径分别为 170,270,460 目,叶 片剪切力分别为 18 895,19 334 以及 19 478 Pa。 可 见随着磨粒直径减小,剪切力略有增大。 分析可知, 磨料浓度过高且粒径过大时,磨料流动性降低,抛光 效果差。 保持进口压力不变,磨粒粒径为 460 目,磨 料浓度为 80%,70%,60% 时,叶片位置的平均剪切 力分别为 19 478,21 484,23 255 Pa。 可见随着磨料 浓度降低,叶片位置剪切力逐渐增加,其原因在于低 浓度磨料流动性强,湍流更加充分,磨粒可积蓄更大 动能完成切削[11] 。 Research on processing technology and surface quality of metal micro⁃holes machined by femtosecond laser [ D] . 航空制造技术,2016(12) : 26⁃31 YANG Qiang, LU Zhongliang, HUANG Fuxiang,et al Research status and development trend of laser additive manufacturing technology[ J] .
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