摘要
对宽凸缘半球形件的凸缘起皱和球面起皱机理进行了理论分析和有限元仿真研究。理论分析表明,凸缘起皱是由压应力引起的,球面起皱是由纬向收缩失稳造成,周向分布不均匀的拉应力也会导致球面局部起皱。有限元仿真表明:随着压边力的增加,凸缘起皱程度逐渐减小并最终消失;随着压边力、毛坯直径和摩擦系数的增加,球面起皱程度也逐渐减小并最终消失;矩形板料会导致球面局部起皱。因此,增加压边力和毛坯直径可以消除凸缘起皱;增加压边力、增大毛坯直径、增加摩擦系数和采用圆形毛坯措施可以抑制球面起皱的发生。
Theoretical analysis and research of finite element simulation were carried on flange wrinkle and sphere wrinkle of hemispher- ical parts with wide flange. Theoretical analysis demonstrates that flange wrinkle is caused by compressive stress, sphere wrinkle is caused by shrink around direction of latitude, and inhomogeneous circumferential tensile stress also leads to partial wrinkle in spherical surface. Finite element simulation shows that with the increasing of BHF, degree of flange wrinkle decreases and eventually disappears. With the increasing of BHF, blank diameter and coefficient of friction, the degree of sphere wrinkle decreases and eventually disappears too. Rec- tangle blank leads to partial wrinkle. So, the elimination of flange wrinkle can be realized by the increasing of BHF and blank diameter, and the occurring of wrinkle can be inhibited by the increasing of BHF, blank diameter and coefficient of friction, so does adopting of round blank.
出处
《锻压技术》
CAS
CSCD
北大核心
2014年第5期56-60,95,共6页
Forging & Stamping Technology
关键词
半球形件
起皱
压边力
摩擦系数
有限元
hemispherical parts
wrinkle
blank holding force （BHF）
coefficient of friction
finite element
