薄壁叶片加工变形误差补偿  

The Error Compensation for Machining Deformation of the Thin Blade

作　　者：董久虎[1] 谌永祥[1] 李双跃[1] 毛鹏枭[1] 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《机械设计与研究》2013年第4期81-85,共5页Machine Design And Research

基　　金：西南科技大学研究生创新基金资助项目(12ycjj39)

摘　　要：为了减少薄壁叶片在加工过程中叶片变形引起的加工误差,提出了一种重构叶片模型补偿加工误差的方法。通过构建端铣刀切削力的数学模型,求解叶片在加工过程中切削力的大小,应用材料力学理论和有限元理论分析加工过程中叶片的变形量,根据镜像对称补偿方法,获取新的叶片截面数据云图。应用NURBS曲线理论,反求出数据云图的NURBS曲线数学模型,通过改变权因子、控制顶点等因素,对新建的叶片数据云图进行优化,求解叶片汽道的光滑截面曲线,实现叶片重构。通过模拟加工验证,原叶片模型的最大加工误差在84μm左右,重构的叶片模型加工误差小于10μm,为提高叶片加工精度奠定了技术基础。In order to reduce the process errors of the thin blade during the machining,the blade surface reconstruction method was presented.The cutting force was solved by constructing the mathematical model of the end milling cutter.According to the material mechanics theory and the finite element theory,the amount of blade deformation during its procassing was analyzed.Based on the mirror symmetry compensation method,the new digitized cloud map of the blade was obtained.And then a mathematical model of the digitized cloud map was solved with the method of the NURBS.By changing the s,control points,knot vectors of the NURBS,a smooth blade profile section curve was obtained and the was realized.Through the simulation of processing the blade,the maximum process error in the original blade model is around 84μm and the process error of the reconstructed blade is below 10μm,which provides the technical foundation for the blade machining accuracy.

关 键 词：叶片变形 切削力 NURBS 误差补偿 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]