高强度钢板在双向等曲率模中的成形回弹研究

来源期刊：中南大学学报(自然科学版)2011年第6期

论文作者：廖娟 周驰 阮锋

文章页码：1629 - 1635

关键词：高强钢；回弹；双曲率；能量法；K-H本构模型

Key words：high strenth steel; springback; doubly curved; energy approach; K-H constitutive model

摘    要：

针对高强板在双向等曲率模具中的冲压回弹问题进行理论预测及实验研究。在基于塑性膜理论的能量法回弹预测模型中增加考虑弯曲效应对回弹的影响，并采用Khan-Huan本构模型描述高强板的材料应力应变曲线。该解析算法能以较少的计算量获得较为准确的回弹后零件形状。研究结果表明：综合考虑膜效应及弯曲效应后预测的结果比仅考虑膜效应预测模型的预测结果更接近实验值，由该模型预测的2种高强板回弹形状与实际形状的法向平均偏差均小于0.15 mm。

Abstract:

The theoretical prediction and experimental study of springback of high strength steel parts deformed in equal doubly-curved die set were investigated. By incorporating Khan-Huan constitutive model into an energy method based on membrane theory of shells, and taking the bending effect into account, the profiles of the parts after springback was predicted with a relatively minor effort of calculation in the design stage. The experiment results show that the profiles predicted by new model agree better with the experimental results than that predicted by the previous model based on membrane theory. The average normal difference between the predicted profiles and the experimental profiles are less than 0.15 mm.