摘要
采用三维有限元方法 ,模拟计算航空铝合金 70 5 0 T745 1材料在无内应力前提下数控铣削时产生的表层残余应力场。在综合考虑了现行的常规工艺方案基础上 ,从中选定 4种具有代表性的走刀路径分别进行分析计算 ,进而优选出最为合适的走刀工艺规则。走刀过程采用动态载荷步模拟 ,材料去除采用生死单元模拟 ,从而使计算结果更加精确、可信。通过本文的研究工作 。
The residual stress field of the stress-free aeronautic aluminum-alloy (7050-T7451) in the milling is studied with three-dimension FEM, and four typical tool-routes are simulated and analyzed respectively. According to the optimization goal of NC milling machining, a reasonable route is selected. In the course of this work, the cutting process is simulated using the dynamic loading step, and the removal of material is realized with the birth and death element technique. With this calculation model, the accuracy of simulation is improved greatly, and the research result can be used to support the selection of practical technology for guaranteeing the dimension stability of the workpiece during the NC milling.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2003年第3期286-288,共3页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金 (5 0 175 10 2 )
国防型号工程(0 0 1810 0 785 )资助项目
关键词
有限元方法
走刀路径
铣削残余应力
载荷步
尺寸稳定性
Aircraft parts and equipment
Aluminum alloys
Computer simulation
Dimensional stability
Finite element method
Numerical control systems
Residual stresses
