摘要
大型复杂薄壁筒形件外形比较复杂,采用凹圆弧轨迹多道次旋压成形。在成形过程前期板料边缘处容易出现起皱、增厚等缺陷。利用ANSYS/LS-DYNA有限元模拟软件对成形前期的三道次进行有限元模拟,分析模拟成形结果的径向应力和切向应力、厚度变化。分析结果表明,在模拟成形结果边缘处径向应力和切向应力随着反方向进给起始接触点到板料边缘处距离增大,先减小后增大;厚度随着反方向进给起始接触点到板料边缘距离减小,厚度越小,增厚趋势越小;大型复杂薄壁筒形件零件多道次旋压成形时,通过有限元模拟仿真为旋轮的运动轨迹设计提供应力、厚度等方面的信息,对旋轮反方向进给的起始接触点到边缘距离选取提供参考,并且降低了研制成本,并缩短了研制周期。
Aconcave circulartrajectory is adopted inthe multi-pass spinning forming processbecause the shape of large complex thin-wall cylinder is complex. At early stage of the forming process,defects such as wrinkling and thickening are prone to occur. The finite element simulation of three passes in the forming process is simulated by ANSYS / LS-DYNA finite element simulation software,and the radial direction stress,tangential stress and thickness variation are analyzed. The analysis shows that the radial stress and tangential stress on the edge of the simulation forming results decrease first and then increase as the distance between the initial contact point in the opposite direction and the sheet edge increases,whilethickness decreases as the distance decreases. As thickness decreases,the thickening trend decreases as well. During the process of multi-pass spinning forming of large complex thin-walled cylindrical parts,information of stress and thickness is provided by means of finite element simulation,and referencefor point to edge distance selection provided. At the same time the development cost and cycleare effectively reduced.
出处
《沈阳航空航天大学学报》
2016年第1期32-37,共6页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:51205260)
关键词
多道次
有限元模拟
应力
厚度
multi-pass
finite element simulation
stress
thickness
