论文部分内容阅读
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 processing error caused by the deformation of the thin-walled blade during machining, a method of compensating the machining error of the reconstructed blade model is proposed. By constructing the mathematical model of the cutting force of the end mill, the cutting force of the blade is calculated and the deformation of the blade is analyzed by the theory of mechanics of materials and the finite element method. According to the mirror symmetry compensation method, the new blade section Data cloud graph NURBS curve theory is applied to obtain the mathematical model of NURBS curve of data cloud. By changing the weight factor, controlling the vertex and other factors, the new cloud data of blade is optimized and the smooth section curve of the blade is solved. The simulation results show that the maximum machining error of the original blade model is about 84μm and the machining error of the reconstructed blade model is less than 10μm, which lays the technical foundation for improving the machining precision of the blade.