基于破裂失效准则的变压边力理论及其工程应用  

A Model of Variable Blank Holder Force Based on Fracture Criterion and Its Applications

作　　者：王武荣[1] 陈关龙[1] 林忠钦[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2007年第4期619-623,共5页Journal of Shanghai Jiaotong University

基　　金：国家青年科学基金支持项目(50225520)

摘　　要：基于变压边力成形是提高铝合金、高强度钢板等难成形材料成形性能的有效方式之一,构建了圆杯件最优压边力理论模型.将冲压过程中的拉伸载荷表达为工艺参数和材料参数的方程,应用与拉伸载荷有关的破裂准则求解出压边力,从而得出随不同行程变化的最优压边力曲线.模型考虑了材料各向异性、不同冲压深度下板料在凹模圆角处的弯曲角,确保预测的准确性.最后,采用多点液压变压边力压机对得出的最优压边力曲线进行验证.结果表明,该最优压边力曲线可有效提高铝合金的冲压深度.Using new material such as aluminum alloy sheet and high strength steel is one of the effective ways to realize the lightweight design of automobile. However, the low formability of these lightweight materials causes great challenge to stamping and variable blank holder force （VBHF） is the promising way to solve this challenge. An analytical derivation model was constructed to predict the optimal BHF for round cup drawing. In this model, the drawing load of stamping process is expressed in the form of process parameters and material parameters, and then the substitution of critical fracture load will solve the optimal BHF at different punch stroke. The anisotropy and warp angle are taken into account to ensure the accuracy of prediction. Finally, the verification on a multi point hydraulic VBHF press shows the predicted optimal BHF profile can increase the drawing depth effectively.

关 键 词：变压边力 冲压 各向异性 

分 类 号：TG386[金属学及工艺—金属压力加工]