将数控渐进成型技术应用在圆孔翻边中,研究了翻边过程中成型力与零件壁厚的变化,分析了成型工艺参数(成型工具头直径、每层进给量和零件的最终孔径)对板料翻边成型过程的影响规律.结果表明:传统翻边工艺中用来衡量板料最大翻边变形程度的极限翻边系数不能应用在渐进成型翻边中;翻边过程中成型力在成型的最后阶段明显减小;翻边成功与破裂的零件相比较壁厚均匀;成型工具头与每层进给量越大可以成功翻边的板料预制孔越小;当零件最终孔径与成型工具头直径之比≤2.5时零件破裂形式为孔口边缘伸长率达到极限值而破裂;其他加工参数一定时,随着成型零件最终孔径的增加,板料初始有效变形长度在达到一定值后不再增加.

CNC incremental forming technology was used in the hole-flanging process,and forming force and thickness distribution during the forming process were studied.Effects of parameters such as forming tool diameter,vertical step size and the final hole diameter on the of hole-flanging process were analyzed.The results show that the usual limit flanging coefficient can not be used in CNC incremental forming of hole-flanging process to show the forming limit of the sheet blank.The forming force decreased quickly in the final stage of hole-flanging process.Compared with the fracture part,thickness distribution of the sucessful flanging one is more homogeneous.Pre-cut hole diameter of the sucessful flanging parts decreases with the increase of the forming tool diameter and vertical step size.When the diameter ratio of the final part and forming tool is less than or equal to 2.5,the part fractures at the hole edge because prolongation of the material has increased to limit.When other parameters are certain,initial effective forming distance will not increase with the increase of the final part diameter after reaching a certain value.