摘要
目的解决航空发动机大尺寸涡轮轴内表面积碳去除的难题。方法运用SEM分析涡轮轴内壁积碳的表面形貌特征、成分组成,为积碳去除方法的确定和工艺研究奠定基础。针对涡轮轴的特殊材质和清洗要求,提出磁力研磨技术去除积碳的方法。通过Solidworks和Workbench软件分析研磨区域的磁感应强度和磨粒受力情况,搭建涡轮轴径向添加辅助磁极和数控机床复合的磁力研磨装置,选取平均粒径为185、250、375μm的磨粒,在工件转速分别为600、800、1000 r/min的条件下进行对比试验。结果在试验中,当磁性磨料粒径为250μm,工件转速为800 r/min,外部磁极与工件外壁的加工间隙为5 mm,研磨时间为60 min时,涡轮轴内表面积碳完全去除,表面粗糙度下降幅度大,研磨后表面粗糙度Ra为1.47μm。结论采用数控磁力研磨设备,可以有效去除航空发动机大尺寸涡轮轴内表面积碳,去除效率高,去除后涡轮轴内表面粗糙度Ra达到1.47μm,满足工件使用要求。
The paper aims to solve the problem of removing the carbon deposition from the inner surface of a large-sized aero-engine turbo-shaft.SEM was used to analyze the micro topography and the components of the carbon deposition to lay a foundation for determining the carbon removal method and process.Considering the special material and cleaning requirements of the turbo-shaft,magnetic grinding technology was proposed to clear carbon deposition.By the means of Solidworks and Workbench,the magnetic induction intensity and the forces on the grinding granules in the grinding area were analyzed.And magnetic grinding equipment which is composed of a CNC and auxiliary poles along the radial direction of the turbo-shaft was set up.Three kinds of average granule diameter,185,250,375μm,were selected to conduct the comparative experiments under the condition of the rotational speed of the workpiece being 600,800,1000 r/min respectively.During experiment,when the granule diameter was 250μm,the rotational speed of the workpiece was 800 r/min,the grinding time was 60 min,and the machining gap between the external poles and the workpiece surface was 5 mm,the carbon deposition on the inner surface of the turbo-shaft was removed completely with a large removal amount and the surface roughness decreased substantially to Ra 1.47μm.CNC magnetic grinding equipment can effectively remove the carbon deposition from the inner surface of a large-sized aero-engine turbo-shaft with high efficiency.The surface roughness of the inner surface of the turbo-shaft can reach Ra 1.47μm which meets the working requirements of the workpiece.
作者
徐会
康仁科
刘冬冬
陈燕
XU Hui;KANG Ren-ke;LIU Dong-dong;CHEN Yan(Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian 116024,China;School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第1期336-342,355,共8页
Surface Technology
基金
国家自然科学基金项目(51775258)
辽宁省自然科学基金重点项目(20170540458)
精密与特种加工教育部重点实验室基金(B201703)~~
关键词
航空发动机
大尺寸涡轮轴
积碳
磁力研磨
表面粗糙度
aero-engine
large-sized turbo-shaft
carbon deposition
magnetic grinding
surface roughness
