工业纯铝1060板料单点增量成形极限实验研究

Experimental Investigation of Forming Limit in Single Point Incremental Forming of 1060 Aluminum Sheet

对工业纯铝1060板料进行单点增量成形极限实验研究,比较了圆锥形件各部位厚度的分布情况。实验发现,当成形角增大时,成形件上部会出现厚度严重变薄的减薄带,并且破裂容易出现在减薄带上,影响板料成形极限。用最大成形角表征单点增量成形过程中的成形极限,分析了不同参数对板料最大成形角的-影响,发现层间距会影响板料的最大成形角,而工具头周向进给速度对最大成形角的影响不大,不同形状的成形件其最大成形角也不相同。最后通过实验获得了1 mm厚度铝板的成形极限曲线(FLC)。

The forming limit in single point incremental forming of 1060 aluminum sheet was studied by experiment. The thickness distribution of different part of conical part was compared. The increase in forming angle will result in thinning the top of forming part, and the rupture was prone to generate on the thinning part soa s to affect the forming limit. The forming limit was represented with maximum forming angle in the single point incremental forming. The effect of the processing parameters on the maximum forming angle was analyzed, it is concluded that the layer step will affect the maximum forming angle of sheet, the circumferential speed of tool head had no significant effect on the maximum forming angle, and finished workpieces with different shape will lead to different maximum forming angle. Finally, the forming limit curve （FLC） of 1 mm thickness aluminum sheet was plotted according to the experiment results.