摘要
为了掌握单侧并列多支管内高压成形时的塑性变形规律,以并列双支管为例,采用数值模拟方法,结合管件形状,分析其应力、应变状态和金属流动规律。研究结果表明:并列双支管在轴向压缩和内压力的共同作用下,支管顶部由于承受双向拉应力,导致壁厚减薄,顶部厚向应变为压应变。支管两侧圆角区由于受到三向压应力使得壁厚增加,圆角区厚向应变为拉应变,支管外侧圆角比内侧圆角的壁厚增加更显著。由于两支管之间(内侧)的主管材料难以流向支管,导致支管仅靠单边轴向压缩完成补料,使得支管中心向内偏移,支管形状呈现非对称结构,从而限制了支管的成形高度。
To investigate the plastic deformation law of unilateral parallel multi-branch tube in hydroforming,for the parallel double branch tube,its stress and strain states as well as metal flow law were analyzed by numerical simulation method and combined with the shape of tube.The results show that under the combined action of axial compression and internal pressure for parallel double branch tube,the wall thickness at the top of branch tube is reduced due to the bidirectional tensile stress,and the strain along the thickness direction at the top is compressive strain.Furthermore,the wall thickness of fillet areas on both sides of branch tube is increased due to the three-directional compressive stress,the strain along the thickness direction at the fillet area is tensile strain,and the thickening on the outer fillet of branch tube is more significant than that on the inner fillet.However,because the main tube material between the two branch tubes(inside) is difficult to flow to the branch tube,the branch tube only relies on unilateral axial compression to complete the filling,which makes the branch tube center shift inward,and the branch tube shape presents an asymmetric structure,which limits the forming height of branch tube.
作者
陈名涛
肖小亭
周富强
Chen Mingtao;Xiao Xiaoting;Zhou Fuqiang(School of Ielligent Engineering,Shaoguan Univesity,Shaoguan 512005,China;School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Sihao Hydroforming Technology Co.,LId.,Foshan 528000,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2021年第4期106-111,共6页
Forging & Stamping Technology
基金
广东省教育厅青年创新人才科技项目(2020KQNCX077)
2019年度韶关学院校级科研项目(SY2019ZK01)
韶关市2019年科技计划(社会发展与企业科技特派员方向)项目(2019sn054)
韶关学院科研启动项目(44099000618)
2019年佛山市核心技术攻关项目(1920001001369)。
关键词
并列双支管
内高压成形
应力
应变
金属流动
parallel double branch tube
hydroforming
stress
strain
metal flow
