剪挤成形工艺分析及数值模拟研究

Investigation of shearing extrusion forming process using finite element method

为了研究不同剪挤成形工艺参数对成形零件质量的影响,本文使用Deform 2D有限元软件建立二维轴对称模型,采用Ludwik硬化流动应力模型和能够同时反映空穴损伤发展和空穴形状变化对损伤程度影响的韧性损伤模型,进行剪挤成形弹塑性有限元分析。分析归纳出板厚、凸凹模间隙、凸模半径、压边力和反顶力等工艺参数对剪挤成形质量和成形力的影响规律,对工程应用具有参考价值。

In order to research how different sheet metal extrusion process parameters affect workpiece quality during sheet metal extrusion process,a two-dimensional axisymmetric model built based on Deform 2D finite element software was used.Furthermore,Ludwik hardening flow stress model and a ductile fracture criterion which indicated the evolution of void and the effect of damage caused by the void shape changes were used to analyze large deformation elasto-plasticity finite element analysis.Based on these analyses,the influencing law of sheet metal thickness,clearance between punch and die,punch radius,pressure ring force and ejector force on the quality of the sheet metal extrusion process and forming force were obtained.The research results show a great value for engineering application.