U型变曲度蒙皮精确闸压有限元建模与参数影响分析

钣金类零件的制造是根据自身经验来制定生产工艺的,一直以来对工艺的革新较少,造成生产合格率偏低、成本高。而影响板材冷成形性能最主要的因素即为材料自身的成形性能。以U型蒙皮为研究对象,进行试验研究与材料分析,为有限元模型提供参数与验证。基于弹塑性有限元理论,通过测试毛坯材料的应力应变数据,建立材料的本构模型,准确预测闸压过程中钣金结构的应力、应变和回弹量。创建闸压成形仿真模型,模型验证后,进行闸压后试片内部应力应变分析、试片厚度,以及回弹分析。基于建立的有限元模型进行了毛坯材质与闸压方向的影响分析。

Finite Element Modeling and Parameter Influence Analysis of PreciseGate Pressure for U-shaped Curved Skin

The manufacturing of sheet metal parts is based on its own experience to develop the pro.duction process which has less innovation , resulting in a low qualified rate of production, high cost.The most important factor affecting the cold forming performance of sheet metal is the forming per.formance of the material itself. Takes U-shaped skin as the research object, conducts experimentalresearch and material analvsis, and provides parameters and verification for the finite element modelBased on the elastic-plastic finite element theory, through testing the stress and strain data of blankmaterial, the constitutive model of material is established, so as to accurately predict the stressstrain and spring-back of sheet metal structure in the process of gate pressure. The simulation modelof gate pressure forming was established. After the model verification, the stress and strain analysisthickness and spring-back analysis of the test piece after gate pressing, were carried out. The influ.ence of blank material and gate pressure direction is analyzed based on the established finite elementmodel.