板料离散热源加热扩孔实验研究

Experimental Research on Sheet Metal Hole Expansion Heated with Discrete Heat Sources

扩孔成形是板料成形技术之一,板料扩孔成形性能通常以成形后的扩孔率作为衡量指标。对SUS304不锈钢板料分别进行离散热源加热扩孔与均匀热源加热扩孔实验,通过对比2种扩孔方式下试样的扩孔率大小来分析扩孔方式对板料成形性能的影响。实验结果表明,离散热源加热对提高板料扩孔成形性能更具有优势,原因是离散热源加热时形成的不均匀温度场与板料的成形过程更为协调,能更有效地提高板料扩孔成形性能。

Hole expansion forming is one of sheet metal forming techniques, expanding hole percentage is usually used as measurable index of the forming performance of sheet hole expansion. Sheet hole expansion of stainless steal SUS304 with discrete heat sources and uniform heat sources were respectively performed. By comparing expanding hole percentage of two kinds of hole expansion ways, influence of different hole expansion ways on forming performance was analyzed. Experimental results show that discrete heat sources has more advantages for improving forming performance of hole expansion. The reason is that discrete heat sources can form non-uniform temperature field, which is more coordinated with deformation process, and can more effectively improve forming performance of hole expansion.