凹模对钢/铝自冲铆接成形及组织的影响  

Effect of Die on Forming and Microstructure of Steel/Aluminum Self-piercing Riveting

作　　者：覃宇 李兵 谢昊东 Qin Yu;Li Bing;Xie Haodong(School of Materials Science&Engineering,Hubei University of Automotive Technology,Shiyan 442002,China)

机构地区：[1]湖北汽车工业学院材料科学与工程学院,湖北十堰442002

出　　处：《湖北汽车工业学院学报》2024年第2期29-33,41,共6页Journal of Hubei University Of Automotive Technology

基　　金：湖北省科技重大专项(2022AAA001);湖北省重点研发计划项目(2021BAB019)。

摘　　要：以厚度为1 mm的DC04钢板和2 mm的AA6061-T6铝合金为铆接对象,通过有限元模拟、静力学测试、金相、扫描电镜、硬度测试等方法研究了3种凹模对钢/铝自冲铆接接头力学性能和组织性能的影响。结果表明:3种凹模铆接试样的等效应力和等效塑性应变发生的位置大致相同;凸台凹模铆接试样的头部高度、最小底部厚度、内锁值分别为0.18 mm、0.59 mm、1.09 mm,与模拟准确度一致;3种凹模由拉伸试验测得的最大载荷力分别为2.89 kN、3.14 kN、3.37 kN,凸台凹模铆接试样拥有更高的强度和承载能力;凹模铆接接头宏观失效形式为上基板撕裂失效,凸台凹模接头处的硬度值略高于母材本身的硬度,在铆钉管脚处更加明显。The DC04 steel plate with a thickness of 1 mm and the AA6061-T6 aluminum alloy with a thickness of 2 mm were used as riveting objects.The effects of three types of die on the mechanical properties and microstructure of steel/aluminum self-piercing riveting joints were studied by means of finite element simulation,statics test,metallographic phase,scanning electron microscopy,and hardness test.The experimental results show that the positions of equivalent stress and equivalent plastic strain of the three types of die riveting samples are roughly the same.The head height,minimum bottom thickness,and internal locking value of boss die riveting sample are 0.18 mm,0.59 mm,and 1.09 mm,respectively,highly consistent with the simulation accuracy.The maximum load force of the three types of die measured by tensile test is 2.89 kN,3.14 kN,and 3.37 kN,respectively.The boss die riveting sample has higher strength and load carrying capacity.The macroscopic failure mode of the die riveting joint is the tearing failure of the upper substrate.The hardness value of boss die joints is slightly higher than that of the base metal itself,and it is more obvious at the rivet pin.

关 键 词：自冲铆接 数值模拟 静力学试验 硬度测试 

分 类 号：TH131[机械工程—机械制造及自动化]