發(fā)布時間：2019-03-28 09:59

【摘要】：基于Johnson-Mehl-Avrami相變動力學模型和Koistinen-Marburger方程,建立了硼鋼22Mn B5車門防撞梁熱沖壓過程的熱機械-相變耦合有限元模型,得到了車門防撞梁熱沖壓過程中板料溫度、微觀組織及維氏硬度的分布特征,研究了保壓壓力和保壓時間對防撞梁熱沖壓零件的性能影響.仿真結(jié)果表明:車門防撞梁頂部冷卻速度為137.3℃·s-1,側(cè)壁冷卻速度為69.8℃·s-1,冷卻速度決定了防撞梁各個部位的微觀組織和維氏硬度;隨著保壓壓力的增大,獲得95%以上馬氏體的防撞梁的保壓時間縮短,可加快生產(chǎn)節(jié)拍.進行了防撞梁熱沖壓試驗,對微觀組織及維氏顯微硬度進行了檢測.結(jié)果表明:車門防撞梁保壓10 s后,頂部及側(cè)壁均已轉(zhuǎn)化為板條狀馬氏體組織,且頂部硬度為508 HV,側(cè)壁硬度為474 HV.
[Abstract]:Based on the dynamic model of Johnson-Mehl-Avrami phase transition and Koistinen-Marburger equation, the thermal mechanical-phase transition coupling finite element model was established for the stamping process of 22Mn B5 door of boron steel, and the sheet temperature in the stamping process of Liang Re was obtained. The distribution characteristics of microstructure and Vickers hardness were studied. The effects of holding pressure and holding time on the properties of impact-proof Liang Re stamping parts were studied. The simulation results show that the cooling rate at the top of the anti-collision beam is 137.3 鈩，

本文編號：2448765