摘要
针对某款汽车后地板横梁的结构特点,合理设计模面,选用22MnMoB新型硼钢,应用有限元软件Dynaform建立后地板横梁热-力-相耦合模型,对其热冲压成形过程进行模拟。研究后地板横梁热冲压成形中板料受力情况及温度场、减薄率、硬度和微观组织演变规律,优化下圆角破裂缺陷。利用定量金相法对后地板横梁侧壁处微观组织进行分析并测得不同特征点处硬度和厚度。结果表明,热冲压后地板横梁厚度分布均匀,最大减薄率小于20%,显微硬度达到480 HV以上,试验结果与模拟结果较为吻合,可为新型硼钢制成复杂结构件提供参考。
According to the structure characteristics of rear floor crossmember,the mold profile was designed reasonably. The 22 MnMoB new boron steel was selected and the thermal-mechanical-metallurgical coupling model of rear floor crossmember was established by using finite element software Dynaform to simulate the hot stamping process. The stress,temperature field,thinning rate,hardness and microstructure evolution rules of sheet metal in hot stamping of rear floor crossmember were studied,and the fracture defect of the lower rounded corner was optimized. The microstructure of the side wall of the rear floor crossmember was analyzed by quantitative metallography,and the hardness and thickness of different characteristic points were measured. The results show that the thickness of hot-stamped rear floor crossmember is evenly distributed and the maximum thinning rate is less than 20%,the microhardness is above 480 HV. The experimental results are in good agreement with the simulation results,which provides a reference for the new boron steel complex structural parts.
作者
陈泽中
刘欢
谢洪昊
李响
张世钊
杨昊岳
欧超勇
CHEN Ze-zhong;LIU Huan;XIE Hong-hao;LI Xiang;ZHANG Shi-zhao;YANG Hao-yue;OU Chao-yong(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;SAIC Commercial Vehicle Technology Center,Shanghai 200438,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第2期13-20,共8页
Journal of Plasticity Engineering
基金
上海市大学生创新基金资助项目(SH2019227)。
关键词
22MnMoB钢
热冲压
汽车后地板横梁
有限元模拟
22MnMoB steel
hot stamping
automobile rear floor crossmember
finite element simulation
