锻压技术

非均匀温度场对高强钢热冲压成形性的影响

英文标题：Influence of non-uniform temperature field on hot stamping formability of high strength steel

作者：谭海林赖春明

单位：湖南化工职业技术学院

分类号：TG386

出版年,卷(期):页码：2015,40(9):32-36

摘要：

针对某企业25MnB5高强钢车身凹槽零件在进行热拉深成形时出现凹槽侧壁断裂的缺陷，采用ANSYS/LS-DYNA动力学有限元分析软件对U型件热冲压成形过程的非均匀温度场进行数值模拟，分析讨论了冲压速率、板料与模具之间摩擦系数对温度场的影响规律。分析结果表明：提高冲压速率、减小模具与板料之间的摩擦系数有利于成形零件温度场的均匀分布，并且可以减少凹槽侧壁产生断裂缺陷的可能性。采用优化后的工艺参数，即冲压速率为300 mm·s-1、板料和模具之间的摩擦系数为0.15进行凹槽零件的热拉深成形试验，获得了合格的产品，验证了模拟结果的可靠性。

For the problem of fracture defect at the groove lateral of the component made of high strength steel 25MnB5 in hot deep drawing process, the non-uniform temperature field of the U-shaped workpiece during hot stamping process was simulated by the dynamic FEM software ANSYS/LS-DYNA. It was analyzed the influences of stamping rate and friction coefficient between the blank and the die on the temperature field. The results show that high stamping rate and small friction coefficient are helpful to form a more uniform temperature field of the component and can reduce the possibility of fracture defect at the groove lateral. When the optimized process parameters such as stamping rate 300 mm·s-1 and friction coefficient 0.15 are used in the hot stamping process, the good quality produces can be obtained and the reliability of their simulation results can be assured.

基金项目：

湖南省科技计划项目（2014GK3059）；湖南省教育厅科学科研项目（15C0468）

谭海林（1968-），男，硕士，副教授

参考文献：

［1］李肖科,周隐玉,刘芳，等.高强度硼钢22MnB5的热变形方程及其模拟应用[J].塑性工程学报,2011,18（6）：53-57.Li X K, Zhou Y Y, Liu F, et al. Hot deformation equation for boron steel 22MnB5 and its application in simulation[J].Journal of Plasticity Engineering,2011,18（6）：53-57.
［2］王梦寒,王彦丽,陈明亮，等.温度和压边力对高强度硼钢热冲压成形板厚的影响[J].热加工工艺，2014,43（13）：136-140.Wang M H, Wan Y L, Chen M L, et al. Effects of temperature and blank-holder force on thickness of high strength boron steel in hot stamping[J].Hot Working Technology，2014,43（13）：136-140.
［3］陈龙.汽车超高强度硼钢板热冲压成形工艺研究[D].合肥：合肥工业大学，2013.Chen L. Research on Hot Stamping Process of Automotive Ultra-High-strength Boron Steel[D].Hefei：Hefei University of Technology，2013.
［4］俞汉清，陈金德.金属塑性成形原理[M].北京：机械工业出版社，1999.Yu H Q，Chen J D. Fundamental of Metal Plastic Forming[M].Beijing：China Machine Press，1999.
［5］GB/T 228.1—2002，金属材料室温拉伸试验方法[S].GB/T 228.1—2002，Tensile experiment method at ambient temperature of metal material[S].
［6］李肖科,周隐玉,刘芳，等.高强度硼钢22MnB5的热变形方程及其模拟应用[J].塑性工程学报,2011,18（6）：53-57.Li X K, Zhou Y Y, Liu F, et al. Hot deformation equation of 22MnB5 high strength boron steel and its application in simulation [J].Journal of Plasticity Engineering,2011,18（6）：53-57.

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