锥形冲头翻边变形应力场的数值仿真

Numerical simulation of stress field of flanging deformation with cone-shaped punch

利用ABAQUS商用软件,对锥形冲头翻边变形过程的等效应力场进行了数值仿真,并与柱形冲头的翻边变形仿真进行了对比。验证了一般规律,也发现了新规律,即两者的应力场形状相同,底部圆角处等效应力在变形第1阶段最大,孔口边缘处等效应力最大出现在变形第3阶段,第4阶段(变形终了时)锥形冲头翻边的等效应力比柱形冲头翻边时下降更大。为锥形、球形、抛物线形冲头的翻边能减少翻边力、降低极限翻边系数的实践与理论认识,提供了一种解释与定量数据。

Through using ABAQUS software, a numerical simulation of equivalent stress field of flanging deformation process with cone-shaped punch was carried out, and compared with simulation of flanging deformation with column-shaped punch. General rules were validated and a new rule was discovered： i. e. the shape of these two stress fields are same, the equivalent stress of the round corner in the bottom reached its maximum at the first phase, the equivalent stress of the edge of hole reached its maximum at the third phase, the equivalent stress of flanging with cone-shaped punch descend more than that with column-shaped punch at the fourth phase i. e. the phase of deformation completed. It offered a explanation and quantificational data of practice and academic research of that flanging with cone-shaped or global punch or parabola-shaped punch can lessen flanging force and reduce flanging limit coefficient.