轧制差厚板方盒件拉深成形的实验与数值模拟

Experimental and Simulation Study on Deep Drawing of Square Box Made from Tailor Rolled Blank

分析了轧制差厚板的显微组织和力学性能存在差异性的原因.针对差厚板方盒件的拉深成形过程建立有限元模型,探讨了其变厚度特性及性能差异化特征的建模方法.通过对比实验及模拟条件下方盒件的成形结果,证明了有限元模型的可靠性.根据验证后的有限元模型,以极限拉深高度和过渡区中心线偏移量为评价标准,分析了差厚板的几何参数(过渡区长度、过渡区位置、薄区与厚区的厚度差)对其拉深成形的影响.结果表明,过渡区越长、厚区占比越大、薄区与厚区的厚度差越小,则差厚板的拉深成形性能越好.确定差厚板的几何参数时,需综合考虑板料的成形性能和轻量化效果.

The microstructure and mechanical properties of different parts in tailor rolled blanks(TRBs)were studied and the differentiation was explained.A finite element model was established to simulate deep drawing process of the square box from TRB and the effects of the thickness and non-uniformly distributed mechanical properties on the model setup were discussed.After comparison the experimental and simulation results,the reliability of the numerical model was verified.Taking the limit drawing height and the offset of thickness transition zone(TTZ)as the evaluation criteria,the effects of the geometric parameters(i.e.the length and position of the TTZ,and the thickness difference between the thin and thick area)on the formability of TRB were analyzed.The results show that when the TTZ length is longer,the distance between the TTZ and thin area is smaller and the thickness difference between thin and thick areas is smaller,the formability of TRB is better.Therefore,determining the geometric parameters of TRB need to consider the formability and light-weight effect.