多道次单点渐进成形变形规律试验研究

Experimental Study on Deformation Law of Multi-stage Single Point Incremental Forming

针对材料在多道次单点渐进成形中的变形规律,研究了其流动特性和应变分布。试验结果表明,多道次单点渐进成形所得零件存在较为明显的第二主应变,且随成形深度的增大而增大,同时,零件壁厚随成形深度的增大明显地减小。针对此问题进行了补充试验,证明增加成形道次可在一定程度上改善成形质量。此外,结合对试验数据的分析,分析了壁厚随成形深度变化的原因,指出对于大成形角度的零件在多道次单点渐进成形中存在成形深度极限。

Flowage property and strain distribution was studied based on the deformation trend of the part gained by multi--stage single point incremental forming. Experimental results show that ex- ists a significant second major strain, increasing with increase in forming depth and wall thickness de- creases with increase in forming depth for the part gained by multi--stage forming. Increasing the quantity of stage can improve the forming quality. Further more, according to the analyses of the ex- periments,a limitation in forming depth in multi--stage single point incremental forming was pro- posed.