热冲压B柱开模回弹控制研究

Research on Opening Die Springback Control of Hot Stamping B-pillar

热冲压开模回弹的控制是影响零件质量的关键问题。提出了一种通过控制热冲压零件开模温度分布而控制开模回弹的方法。对热冲压B柱进行了开模回弹的数值模拟,并通过试验验证了仿真方法的有效性和结果的准确性。分析了热冲压B柱开模回弹的主要变形模式、回弹部位与回弹量,对主要回弹部位进行了区域划分与区域开模温度调整,研究了区域温度控制与开模回弹模式和回弹量的关系,并获得了开模温度分布所引起的开模回弹规律。最终通过改变开模零件不同区域温度分布实现了热冲压B柱开模扭曲变形的控制。

Controlling the springback of hot stamping parts after opening die is a key problem of influencing parts quality. A springback control method by adjusting opening die temperature distribution of hot stamping parts was proposed. The opening die springback of hot stamping B-pillar was numerically simulated. The accuracy of the results and validity of the simulation method were verified by experiment. The main deformation mode, springback parts and springback amount of the opening die springback of hot stamping B-pillar were analyzed. Regional division and regional die temperature adjustment of the main springback positions were carried out. The relations between the zone temperature control and the opening die springback model and the springback amount were investigated. And opening die springback law caused by opening die temperature distribution was obtained. Finally, the control of the opening die distortion deformation of hot stamping B-pillar was realized by changing the temperature distribution of the opening die parts in different regions.