摘要
The theoretical analysis of springback in rotary stretch bending process of L-section extrusion was studied. The models for characterizing the springback angle after unloading were established based on the stress and strain distributions in the cross-section of the part. With the proposed model, analysis of the effect of pre-stretch force and post-stretch force on springback angle shows that springback decreases as the pre-stretch force or post-stretch force increases. Comparative study with experiments clearly demonstrates that the prediction of springback can resort to the current model without the loss of accuracy.
从理论上对角型材的拉弯回弹进行研究,基于角型材截面应力、应变分布算法建立拉弯解析模型,推导零件卸载后回弹角的计算公式,分析讨论预拉力和补拉力对回弹的影响规律。结果表明:拉弯零件的回弹随着预拉力或补拉力的增大而减小。与试验结果的对比表明,建立的解析模型能够较好地预测角型材拉弯零件的回弹。
基金
Project (20090450276) supported by the China Postdoctoral Science Foundation
Project (50905008) supported by the National Natural Science Foundation of China
