Analysis Of Deformation Mechanics And Finite Element Modeling Of Closed-extruding Fine Blanking

The closed-extruding fine blanking is a new technology of Sheet metal parts forming developed in recent years. Due to the characteristics of low deformation region, short deformation time, large deformation, the research of deformation mechanism is complex. Meanwhile, there are no suitable specially software for simulation of the closed-extruding fine blanking. Therefore, the deformation mechanics analysis and finite element modeling of closed-extruding fine blanking is very necessary to undertake a study. The process, characteristic and mechanism of the closed-extruding fine-blanking were analyzed. By the slip line method, stress field model of fine blanking deformation zone is established. Based on realistic results of FEM, the finite element model of realistic can be generalized.The process, characteristic and mechanism of the closed-extruding fine-blanking were analyzed. By the slip line method, the author does some researches about the blanking force and hydrostatic stress in slide-line methods. On the basis of the material deformation characteristics, 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 30 mm in diameter and 14 mm thick round part of fine blanking process is carried out by using the software which combined with the established model and finite element method. Through comparing the simulation results of different model, 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. This thinking can provide reference for other materials forming simulation. Based on realistic results of FEM, the process parameters and mould structure can be optimized.