中厚板多点成形中回弹的数值模拟

回弹是影响成形件质量的主要因素之一，是板材冷冲压成形中必须解决的问题。以圆柱面和球面件为例，采用显-隐式算法模拟多点成形中厚板时的回弹现象。显式算法模拟加载成形过程，隐式算法模拟卸载回弹过程。模拟中采用Mises屈服准则的双线性各向同性硬化材料模型。对不同板厚和不同变形量的成形件进行回弹数值模拟，分析回弹的趋势和回弹的影响因素。得出：成形件的板厚越大、变形量越大，卸载后的回弹越小。

Numerical simulation of springback of multi-point forming for plate

Springback is one of the key defects in plate forming,which must be solved in stamping because it affects forming quality.The plate springback matter during the processes of multi poiut forming are simuiated and studies based on explicit-implicit algorithm.taking the column and sphercal workpiece as the example.Dynamic-explicit formulation is employed to analyze the forming processes and the implicit algorithm formulation is used to analyze unloading processes.The Mises' Bilinear isotropic hardening model is applied to simulated the springback processes with different thickness and different curvature and analyze the factors which have effect on the springback.Results indicate that springback ratios is smaller when the thickness and the curvature are bigger.