【作者】 贾彬彬； 郑楠； 王卫卫；

【Author】 Jia Bin-bin;Zheng Nan;Wang Wei-wei;Harbin Institute of Technology at Weihai;

【机构】 哈尔滨工业大学(威海)；

【摘要】 为减小回弹,提高板材成形的形状精度,本文提出了一种新的成形工艺——多点渐进成形,采用多液压缸结构,分别控制上下压头的作用力,使板材在压力差作用下实现渐进成形。以圆柱面为研究对象,利用数值模拟对多点渐进成形和传统多点成形两种成形方式下板材的受力和变形特点进行对比分析。结果表明:与传统多点成形相比,多点渐进成形改善了板材的受力状态,优化了板材的变形路径,板材整体约束逐段成形的特点使板材应变分布更加均匀,最大等效塑性应变值提高了34.64%,塑性变形量增大,板材回弹位移和回弹曲率分别减小了78.60%和62.02%。多点渐进成形改变了传统多点成形中板材的受力和变形特点,能显著减小回弹,提高板材形状精度。更多还原

【Abstract】 In order to reduce the springback and improve the shape accuracy of sheet metal, a new forming process named multi-point incremental forming(MPIF) was put forward, in which multi-hydraulic cylinder structure was used for the control of the forming force provided by the upper and lower head and sheet metal realized incremental forming under the action of pressure difference. The cylindrical surface was taken as research object and the numerical simulation was used to analyze the stress and deformation characteristics of the sheet metal in two kinds of forming methods, including MPIF and traditional multi-point forming(MPF). The results show that the stress state of the sheet metal is improved and the deformation path is optimized in MPIF compared with that in MPF. In addition, the strain distribution is more uniform in MPIF because of the full constraint and the piecewise forming of the sheet metal. The maximum equivalent plastic strain value increases by 34.64% and the amount of plastic deformation increases so that the amount of springback displacement and springback curvature decrease by 78.60% and 62.02%, respectively. Therefore, MPIF has changed the force and deformation characteristics of the sheet metal in MPF, which results in the significant decrease of the springback and the improvement of the shape accuracy of the sheet metal.更多还原