航空铝合金薄壁件加工变形有限元仿真与分析  

Finite element simulation and analysis of deformation in machining of aeronautical aluminum alloy thin-walled workpiece

作　　者：毕运波[1] 柯映林[1] 董辉跃[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第3期397-402,共6页Journal of Zhejiang University：Engineering Science

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

摘　　要：综合考虑薄壁件粗精加工工序,建立了薄壁件铣削加工全过程三维有限元模型,系统地研究了残余应力施加、切削力建模及动态加载、材料去除等加工过程建模所涉及的关键技术.通过自行构建的加工仿真平台,对处在不同毛坯初始残余应力分布情况下的薄壁件分别进行了加工过程模拟.仿真结果表明,加工过程中残余应力对切削力引起的薄壁件加工变形具有重要影响,较大的初始残余应力导致薄壁件侧壁首末自由端附近产生加工变形波动,容易引起或加剧切削振动,严重影响其加工精度及表面质量.In comprehensively consideration of the rough- and finish-machining processes, a three-dimensional finite element model was developed for the whole milling process of thin-walled workpiece. Some key techniques including residual stress imposing, cutting force modeling and dynamic loading, material removal and so on were discussed. By a prototype version of the developed simulation environment, different milling processes of thin-walled workpiece were simulated under the conditions of different initial residual stress distribution in blank. Simulation shows that the residual stress has great effect on the machining deformation caused by cutting force. Greater magnitude of initial residual stress results in the deformation vibration near the two free ends of the side wall, and it can lead to or increase the machining vibration which will influence the machining precision and surface quality seriously.

关 键 词：薄壁件 加工变形 残余应力 加工过程仿真 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TH123.2[自动化与计算机技术—计算机科学与技术]