软模冲裁工艺数值模拟及变形机理  

Numerical simulation and deformation mechanism of flexible-die blanking

作　　者：刘倩[1] 刘靖[1] 张永军[1] 韩静涛[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《塑性工程学报》2016年第1期40-45,共6页Journal of Plasticity Engineering

摘　　要：采用试验与有限元模拟相结合的方法研究了软模冲裁与变形机理。通过体积压缩试验将聚氨酯变形转化成压强形式,避免了有限元模拟中构建本构模型与处理耦合变形的问题。利用ABAQUS软件建立了二维轴对称模型,揭示了板料变形机理,分析了浸入深度与应力三轴度的变化情况以及板料厚度对冲裁力和塌陷程度的影响。设计制造了软模冲裁装置,从冲裁力-行程曲线方面进行了工艺试验验证。研究结果表明,裂纹在凸模刃口附近产生并单方向扩展;聚氨酯硬度增加可减少冲孔后的塌陷程度,但同时会增大冲裁力;随着材料厚度增加,冲裁力与塌陷程度均明显增大。Both the experiments and the finite element method were used to investigate the flexible-die blanking and the deformation mechanism.The polyurethane deformation was transformed into pressure via the volume compression test to avoid creating constitutive model and dealing with the coupling deformation in finite element simulation.A two-dimensional axisymmetric model was established by using Abaqus software to reveal the sheet deformation mechanism.The variations of the penetration depth and the stress triaxiality were analyzed,as well as the effect of the sheet thickness on the blanking force and the collapse degree.An experimental setup was designed and manufactured to verify the simulated results in aspect of the blanking force-displacement curve.The results showed that the crack would appear around the punch edge and unidirectionally propagate.The collapse extent reduces and the blanking force increases along with the increasing of the polyurethane hardness.As the sheet thickness increases,the blanking force and the extent of collapse would significantly increase.

关 键 词：软模冲裁 体积压缩 断裂准则 聚氨酯 数值模拟 

分 类 号：TG386[金属学及工艺—金属压力加工]