北京航空航天大学学报 ›› 2013, Vol. 39 ›› Issue (4): 508-511,516.

• 论文 • 上一篇    下一篇

铝合金拉形粗晶临界预应变曲线的建立及应用

王昆1, 万敏1, 华程2, 邵旭分2   

  1. 1. 北京航空航天大学 机械工程及自动化学院, 北京 100191;
    2. 成都飞机工业集团公司 制造工程部, 成都 610092
  • 收稿日期:2012-03-25 出版日期:2013-04-30 发布日期:2013-05-03
  • 基金资助:
    国家863计划资助项目(2007AA04Z1A3); 国防基础科研资助项目(D0620060428)

Determination and application of coarse-grain critical pre-strain curve to aluminum alloy stretch forming

Wang Kun1, Wan Min1, Hua Cheng2, Shao Xufen2   

  1. 1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
    2. Department of Manufacturing Engineering, Chengdu Aircraft Industries Co. Ltd., Chengdu 610092, China
  • Received:2012-03-25 Online:2013-04-30 Published:2013-05-03

摘要: 粗晶是铝合金蒙皮多道次拉形中常见的成形缺陷.根据实际蒙皮拉形过程和变形状态,按照"预拉伸-淬火-微观组织分析"的流程,对2024-O铝合金板材进行了不同应变路径下的试验,建立了晶粒大小和热处理前预拉伸量的关系.采用网格应变测量技术,确定了不同应变路径下的粗晶临界预应变,建立了粗晶临界预应变曲线.应用该曲线对蒙皮拉形过程进行了有限元分析,从而控制粗晶的产生.

Abstract: Coarse-grain is one of the main defects in multistage stretch forming of airplane skins for aluminum alloy. An experiment of different strain paths to 2024-O aluminum alloy was designed according to the deformation state and process in skin stretch forming. The experiment process was pre-stretch, quench heat treatment and microstructure analysis, from which the relationship between grain size and deformation before heat treatment was established. The critical pre-strains of different strain paths were obtained through grid strain measurement, and the critical pre-strain curve was determined. The finite element analysis of an airplane skin was carried out combined with the critical pre-strain curve, and the coarse-grain was controlled.

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