摘要
对多点成形中压痕缺陷的形成及影响因素进行了力学分析,指出弹性垫技术可以明显地消除压痕缺陷。采用多点压机及多道多点成形技术改变了约束方式及变形路径,因而有效地抑制了成形缺陷的产生,提高板材的成形极限并实现了大变形量成形。通过典型的数值模拟及成形实验说明了弹性垫技术及多道成形技术消除压痕缺陷的有效性。
The formation of the defective dimple and its influencing factors in multi-point forming(MPF) process of sheet metal were analysed mechanically and it was indicated that dimpling defect could be eliminated evidently with elastic cushion.In the forming processes of MPF press and multi-step MPF,the restraint condition and deformation path of sheet metal were changed,and the forming defects were subdued,then the forming limitation was improved and large deformation could be achieved.Numerical results and forming tests of typical specimens demonstrate that dimples are eliminated effectively by means of elastic cushion and multi-step MPF.
出处
《吉林大学学报(工学版)》
EI
CAS
CSCD
北大核心
2004年第1期91-96,共6页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金资助项目(50275063)
"十五"国家重点科技攻关资助项目(2001BA203B11).
关键词
板材
多点成形
压痕
sheet metal
multi-point forming
dimple