高强度钢板拉深模具结构有限元分析与试验研究

Reaearch of finite element modeling & experiment of the die structure for high-strength steel sheet metal stamping

高强度钢板在汽车车身结构中的广泛应用,对冲压成形工艺和模具的设计带来了诸多问题和挑战。文章针对高强度钢板DP600的拉深成形过程,基于LS-Dyna和MSC.Marc有限元软件,采用动力算法和静力算法相结合的方法,对拉深模具结构在冲压过程中的应力应变状态进行了有限元分析,得到了模具结构上任意位置应力和应变随冲压行程的变化规律。同时,利用自主开发的冲压模具结构应力应变状态的试验测量系统,在MTS试验机上完成了相应的冲压拉深实验和模具变形测量。实验测量结果与数值计算结果吻合较好。提出的研究方法对进一步开展高强度钢冲压模具的受力分析和设计优化提供了保证。

With the drive towards implementing high-strength steel, lots of issues and challenges have been brought up to stamping die design, manufacturing and application. A method of numerical simulation with the combination of dynamic explicit （LSDyna） and static implicit （MSC. Marc） algorithm was investigated to predict die structure deformation. In addition, the experiment of measuring the stress on the die during DP600 drawing process was used to validate the FEA results. It is shown that the numerical predictions are in good correlation with the experimental ones. This proposed methodology provides an effective way to support the development of forming process and die design of high-strength steel stamping.