航空学报 > 2003, Vol. 24 Issue (3): 286-288

航空结构件铣削残余应力分布规律的研究

王立涛1, 柯映林1, 黄志刚1, 许德2, 吴群2   

  1. 1. 浙江大学机械与能源工程学院制造工程研究所, 浙江杭州 310027;2. 成都飞机工业集团公司数控加工中心, 四川成都 610092
  • 收稿日期:2002-07-05 修回日期:2003-02-23 出版日期:2003-06-25 发布日期:2003-06-25

Study on Residual Stress Produced in Milling of Aeronautic Structure

WANG Li-tao1, KE Ying-lin1, HUANG Zhi-gang1, XU De2, WU Qun2   

  1. 1. The College of Mechanical and Energy Engineering; Zhejiang University; Hangzhou 310027; China;2. NC Center of Cheng Du Aircraft Corporation; Chengdu 610092; China
  • Received:2002-07-05 Revised:2003-02-23 Online:2003-06-25 Published:2003-06-25

摘要: 采用三维有限元方法,模拟计算航空铝合金7050-T7451 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,可为提高该类材料数控铣削加工的尺寸稳定性确定合理的工艺策略。

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

Abstract: 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 tothe optimization goal of NC milling machining, a reasonable route is selected. In the course of this work, the cuttingprocess is simulated using the dynamic loading step, and the removal of material is realized with the“birth anddeath”element technique. With this calculating 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 ofthe workpiece during it in NC milling.

Key words: FEM, tool-route, milling residual stress, load step, dimension stability

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