摘要
目的为满足结构舱段用高强高韧铝合金宽幅薄壁高筋整体成形壁板的精密制备需求,在材料退火组织状态下,结合不同压弯半径展平工装,实现7A85结构壁板的展平处理。方法采用ABAQUS有限元软件计算不同压弯半径下的结构回弹尺寸,采用万能力学性能试验机测试不同区域的力学性能,结合扫描电镜完成组织形貌与断口形貌的观察。结果随着压弯半径的增大,7A85铝合金结构壁板蒙皮区域的应力峰值持续下降,结构回弹尺寸误差先下降后上升,立筋区域的应力峰值持续下降,结构回弹尺寸误差先下降后上升。当FSW加厚区进行压弯时,随着压弯间隙的增大,应力峰值持续下降,随着压弯半径的增大,应力峰值先上升后下降,结构回弹尺寸误差明显提高。结论结合7A85铝合金挤压圆筒不同区域金属型退火展平模具,成功制备出了幅长为8000 mm、幅宽为1280 mm的7A85铝合金结构壁板。
The work aims to meet the precise preparation requirements of high-strength and high-toughness wide thin-wall high-reinforcement integrally-formed aluminum alloy panel for structural cabin,so as to flatten the 7A85 structural panel by combining flattening tools with different bending radii under the annealing microstructure of the materials.The rebound structural size under different bending radii was calculated by ABAQUS FEM software,the mechanical properties were tested by universal testing machine,and the microstructure and fracture morphology were observed by scanning electron microscopy.The peak stress inside the skin regions of 7A85 aluminum alloy structural panel decreased with the increase of bending radius,and the rebound structural size error decreased firstly and then increased.The peak stress in the vertical reinforcement area continued to decrease,and the rebound structural size error decreased firstly and then increased.When FSW thickened area was subject to bending,the peak stress decreased continuously with the increase of bending gap.With the increase of bending radius,the peak stress firstly increased and then decreased,and the rebound structural size error increased obviously.Combined with metal mold annealing flattening dies of 7A85 aluminum alloy extrusion cylinder in different areas,7A85 aluminum alloy structural panel with a width of 1280 mm and a length of 8000 mm is successfully prepared.
作者
樊振中
张东
韩金全
魏佳乐
许晨玲
陆政
FAN Zhen-zhong;ZHANG Dong;HAN Jin-quan;WEI Jia-le;XU Chen-ling;LU Zheng(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Advanced Engineering Technology and Application Research Center of Aluminum Materials,Beijing 100095,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China;Beihang University,Beijing 100191,China;Dalian Huicheng Aluminum Co.,Ltd.,Liaoning Dalian 116105,China)
出处
《精密成形工程》
北大核心
2022年第9期50-59,共10页
Journal of Netshape Forming Engineering
关键词
7A85铝合金
结构壁板
压弯半径
退火压平
成形尺寸
组织性能
7A85 aluminum alloy
structural panel
bending radius
annealing flattening
forming size
microstructural properties
