不同材料外推模型的闭挤式精冲有限元模拟比较

为了解决闭挤式精冲有限元仿真准确性的问题,基于板料拉伸试验数据,建立了5种流变应力曲线外推模型。利用Deform-2D有限元软件这一平台,植入到有限元软件的功能模块,基于开发的Deform-2D有限元软件,对直径30mm、厚度14mm圆形件的闭挤式精冲成形过程进行模拟。通过物理实验,对不同流变模型的仿真结果进行比较。研究表明,Ludwik材料外推流变模型适合于闭挤式精密冲裁工艺的有限元模拟仿真,可以有效提高闭挤式精冲有限元模拟的仿真精度。

Comparison of Different Extrapolation Models for Materials in the Closed-extruding Fine-blanking Simulation

In order to improve the accuracy of the simulation of the closed-extruding fine blanking,select five rheological equation as the closed-extruding fine blanking material stress-strain equation.Through the test data obtained from tension experiment,with the model and then extrapolated to predict the flow stress curve of the closed-extruding fine blanking.Absoft-fortran language was secondarily used to develop Deform-2D software,which combined with the stress model.Numerical simulation of a 30mm in diameter and 14mm thick round part of fine blanking process is carried out by using the software which combined with the established model and finite element method.In physical experiment,,the finite element model of realistic was verified.The results show that Ludwik extrapolation rheological model is suitable for finite element simulation of the closed-extruding fine blanking,and improve the accuracy of this model.