论文部分内容阅读
回弹问题限制高强钢的广泛使用。数值模拟预测高强钢回弹的精度很大程度上取决于所应用的材料模型是否能对材料的包辛格效应准确描述。本研究旨在将力学解析方法、数值模拟技术、响应面分析法综合应用于高强度薄钢板U型件冲压回弹的预测中。基于考虑包辛格效应的材料模型实现高精度模拟预测回弹,随后利用理论解析方法结合有限元模拟与响应面法分析压边力、摩擦系数、模具圆角半径对回弹的影响规律。结果表明,摩擦系数较小时,板料的回弹程度随压边力的增大而减小;而摩擦系数较大时,板料的回弹程度随压边力的增大而增大。选择合适的模具圆角半径可以显著减小零件的回弹量。
Springback problems limit the widespread use of high strength steel. Numerical simulations predict the accuracy of HSR rebound depends to a large extent on whether the applied material model can accurately describe the material’s Bauschinger effect. The purpose of this study is to apply mechanical analysis, numerical simulation and response surface analysis to the prediction of U-shaped stamping rebound of high strength steel plate. Based on the material model considering the Bauschinger effect, the simulation model is used to predict the rebound. Then theoretical analysis, finite element simulation and response surface method are used to analyze the influence of blank holder force, friction coefficient and die fillet radius on springback. The results show that when the friction coefficient is small, the rebound degree of the sheet decreases with the increase of the blank holder force. When the friction coefficient is larger, the sheet rebound degree increases with the blank holder force increasing. Select the appropriate radius of the mold fillet can significantly reduce the springback of the part.