航空涡轮叶片扩散型气膜孔电火花铣削加工关键工艺研究  

Research on key technology of EDM milling for diffuse film hole of air turbine blade

作　　者：王浩杰 曹自洋 张洋精 WANG Haojie;CAO Ziyang;ZHANG Yangjing(College of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,CHN)

机构地区：[1]苏州科技大学机械工程学院,江苏苏州215009

出　　处：《制造技术与机床》2022年第9期69-76,共8页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金项目(51905363);江苏省中外合作办学平台联合科研项目(2019-21)。

摘　　要：针对Inconel 718航空涡轮叶片扩散型气膜孔加工中复杂三维微细型腔的加工要求,采用微细电火花端部放电分层铣削加工工艺,针对铣削加工中分层厚度、运动轴90°转角伺服加减速控制等关键工艺对三维结构纵横截面轮廓度的影响进行研究。建立电火花铣削加工底面轮廓通用数学模型,利用MATLAB仿真分析不同初始分层厚度对轮廓底面的影响,通过试验获取0.005 mm初始加工深度并加工出表面轮廓度小于0.01 mm的三维扩散型气膜孔纵向截面。针对三维结构横向截面中存在的90°大转角,采用混合S型伺服进给控制策略,减小90°转角处因过大速降引起的内凹横向截面,通过试验获得高精度扩散型气膜孔横向截面。According to the processing requirements of the complex three-dimensional micro-cavity in the processing of the diffused air film hole of the Inconel 718 aviation turbine blade,the micro-EDM milling process is adopted.The influence of key processes such asservo acceleration and deceleration control on the profile of the longitudinal and cross-section of the three-dimensional structure is studied.A general mathematical model of the bottom surface profile of EDM milling is established,and MATLAB is used to simulate and analyze the influence of different initial layer thicknesses on the bottom surface of the profile.he initial machining depth of 0.005 mm was obtained through experiments,and the longitudinal section of three-dimensional diffusion film hole with surface profile less than 0.01 mm was processed.Aiming at the 90°large turning angle existing in the transverse section of the three-dimensional structure,the hybrid S-type servo feed control strategy is adopted to reduce the concave transverse section caused by the excessive speed drop at the 90°turning angle,The transverse section of high precision diffusion film hole is obtained through experiments.

关 键 词：涡轮叶片 电火花铣削 扩散型气膜孔 分层厚度 伺服控制 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]