复合织构模具对筒形件成形影响的数值模拟及实验研究  

Numerical simulation and experimental study on influence of composite texture die on forming of cylindrical parts

作　　者：何梦虎 符昊[1] 符永宏[1] 梁爽 沈洁 杨泽檀 HE Meng-hu;FU Hao;FU Yong-hong;LIANG Shuang;SHEN Jie;YANG Ze-tan(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《塑性工程学报》2020年第12期58-65,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51175233);江苏省重点研发计划项目(BE2016144);机械系统与振动国家重点实验室开放基金资助项目(MSV201917);江苏省博士后科研资助计划项目(2019K233)。

摘　　要：采用凹体减摩形貌和凸体增摩形貌的复合织构主动调控模具/工件界面的摩擦特性,改善工件成形缺陷。模拟对比了复合织构模具和无织构模具拉深后成形件的最大减薄率和成形极限。同时,进行筒形件成形实验,分析了复合织构模具对筒形件成形的影响规律。仿真结果表明,相较于无织构模具,复合织构模具可以优化模具表面的摩擦特性,降低成形件底部圆角区域的减薄率。实验结果证实了凸起形貌可以增大摩擦,抑制材料流出,凹坑形貌则减小摩擦,促进材料流入,从而使成形件底部圆角区域的厚度增大,降低拉裂风险,与仿真结果一致。The composite texture with concave morphology reducing friction and convex morphology increasing friction was used to actively regulate the friction characteristics of die/workpiece interface and improve the forming defects of parts.The maximum thinning rate and forming limit of the parts formed by the composite texture die and the die without texture were simulated and compared.At the same time,the forming test of cylindrical parts was carried out to analyze the influence of composite texture die on the forming of cylindrical parts.The simulation results show that compared with the die without texture,the composite texture die can optimize the surface friction characteristics of die and decrease the thinning rate at the bottom fillet zone of the formed parts.The experimental results verify that the convex morphology can retard the outflow of the material by increasing the friction,and the concave morphology can promote the influx of the material by decreasing the friction.Thus the thickness at the bottom fillet zone of the parts increases,which reduces the risk of cracking,and it is in good agreement with the simulation result.

关 键 词：复合织构模具 数值模拟 拉深实验 摩擦系数 厚度 

分 类 号：TG376[金属学及工艺—金属压力加工]