小成形角曲面制件渐进成形方法

The Incremental Forming Method of the Parts with Small Forming Angle

数控渐进成形是作为一种新兴的塑性加工技术,关于其成形性能的研究多为最大成形角的研究,很少有小成形角方面的探索。小成形角曲面样件由于成形角度小,成形刚度低,在利用渐进成形方法制造过程中极易产生回弹和鼓包等问题。通过对此类样件进行的正、负两种形式进行工艺改进,提出了针对此类零件成形缺陷的解决方案:负成形中产生的中心鼓包和边缘翘曲可分别采用平头工具头和退火处理得以解决,正成形中产生的边缘翘曲则可通过升降台设定预压量来解决。

As one of the new plastic forming technologies, the forming performance of the NC incremental forming is mostly focused on the largest forming angle, there is a few work about the small forming angle. For small forming angle parts, the springback and unexpected bulge are two key problems in the parts forming procedure using the NC incremental forming. The positive and negative incremental forming methods are investigated through experiments. The experimental results show that unexpected bulge in the center and warp at the edge produced in negative incremental forming can be settled by using flat tool and annealing. The edge warp produced in positive forming can be solved by settling preloading quantity of the elevating. Both of the positive and negative incremental incremental forming can eventually get ideal parts.