航空薄壁件对称及阶梯对称铣削的数值仿真与分析  

Numerical Simulation and Analysis of Symmetry and Step-symmetry Milling of Aerospace Thin-walled Workpiece

作　　者：白万金[1] 柯映林[1] 吴红兵[1] 董辉跃[1] 

机构地区：[1]浙江大学,杭州310027

出　　处：《中国机械工程》2009年第2期214-217,共4页China Mechanical Engineering

基　　金：国家863高技术研究发展计划资助项目(2006AA04Z147);国家自然科学基金资助项目(50435020)

摘　　要：为研究薄壁工件在铣削加工过程中的让刀变形,以工字型薄壁结构件为例,建立了铣削加工过程的有限元模型。综合考虑切削载荷、加工顺序等因素,对薄壁工件进行了对称铣削及阶梯对称铣削全过程的有限元数值仿真。模拟结果表明:薄壁件中部变形大,两端及底部变形小;阶梯对称铣削能显著减小薄壁件加工的让刀变形,对称铣削及阶梯对称铣削两者残余应力相差不大且分布情况相似。试验结果表明有限元模拟结果可以接受。根据有限元分析的结果,结合数控加工偏摆补偿,可以达到高效、经济、优质加工航空薄壁零件的目的。To study the part deflection during milling process of low rigidity parts, a new three dimensional （3-D） finite element analysis （FEA） model of an I-sectional thin-walled workpiece was presented. Both the so called symmetry and step-symmetry milling processes were simulated with the FEA method. Key factors, such as cutting loads, sequences and paths were synthetically taken into account. Simulation results indicate that the maximum deflection occurring on the middle of the thin-walled workpiece. With step-symmetry milling method, it can be significantly reduced the part deflections. The magnitudes, as well as distributions, of the residual stress have little differences between symmetry and step-symmetry milling processes. Based on the FEA simulation results and numerical control（NC） machining compensation methods, the aluminum thin-walled workpiece can be machined in an economical, high efficiency and quality way.

关 键 词：薄壁件 让刀变形 有限元 加工过程仿真 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]