摘要
以方形零件为例,研究了液压胀形过程中加载路径、摩擦系数、加工硬化指数和厚向异性系数对圆角填充性能的影响规律,采用3种不同的加载路径在由上海交通大学研制的计算机控制液压胀形机上进行试验,并采用动力显式有限元软件LS-Dyna对液压胀形过程进行仿真.结果表明:增大内压力有利于提高零件圆角处的贴模量;适当增加轴向进给量有利于改善零件的厚度分布均匀性;增大摩擦系数对零件的贴模量影响较小,但会降低零件的厚度分布均匀性;较大的厚向异性系数和加工硬化指数有利于液压胀形零件的圆角填充.
The effects of the loading path, the friction coefficient, the strain hardening exponent and the anisotropic coefficient on the corner filling process through the hydroforming process in a square-sectional die were explored. Experiments were performed on the hydroforming machine developed by Shanghai Jiao- tong University with three different loading paths, and finite element simulations were performed with the dynamic explicit program LS-Dyna. The results show that the increment of the internal pressure helps to increase the contacting area between the part and the die surface, and the increment of the axial feed helps to improve the thickness uniformity of the tube wall; the friction coefficient has little effect on the contac- ting area, but the increasing of the friction coefficient reduces the thickness uniformity of the tube wall; high levels of the anisotropy coefficient and the strain hardening exponent are favorable for the tube hydro- forming process.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第1期75-78,83,共5页
Journal of Shanghai Jiaotong University
关键词
液压胀形
圆角填充
厚向异性系数
加工硬化指数
加载路径
摩擦系数
hydroforming
corner filling
anisotropy coefficient
strain-hardening exponent
loading paths
friction coefficient
