拼焊板盒形件充液拉深的数值模拟

Numerical simulation of hydro-forming of tailor welded blanks

随着汽车行业对能源消耗和汽车尾气排放的要求,应用拼焊板成形技术显得越来越重要。以差厚拼焊板拉深方盒件为研究对象,采用板料成形分析软件DYNAFORM对充液拉深和传统拉深工艺进行分析和对比。研究发现,盒形件不同部位其焊缝有不同的移动趋势,传统拉深最大焊缝移动量发生在盒形件底部中心处,充液拉深件焊缝移动最大量发生在侧壁顶部,增大充液拉深凹模油腔的压力,可以有效地减少焊缝移动量和坯料的减簿量。

Due to the requirements to save the energy and to reduce the tail gas in automobile, making good use of forming technologies in the tailor-welded blanks （TWBs） becomes more and more important. The tailor-welded blanks with different thickness drawn into square cup were taken as an example and the hydro-forming drawing process was numerically simulated with sheet forming software DYNAFORM by contrast to conventional drawing. The conclusions show that different tendencies of weld-line movement occur in different positions of square cups, and the maximal weldline movement occurs in the bottom center during the conventional drawing while it occurs in the jamb wall during the hydro-forming. Meanwhile, high-grade products with small weld-line movement and small reduction in slab thickness can be gained when the oil pressure is increased.