【摘要】 本文利用有限元软件DEFORM分析了初始厚度、轧辊温度、压下率及轧制速度对热辊轧制AZ31镁合金冷带材过程接触压力、速度、等效应力、等效应变及等效应变速率分布规律。结果表明：热辊对轧件起到了显著加热作用，轧件温度明显升高，表面与心部温差先增加后减小。接触压力在刚端与塑性交界面急剧增加然后降低，进入塑性变形区再次增加至前滑区降低，从入口端到出口端速度和等效应变呈近似S型增加，等效应力和等效应变速率整体变化趋势是先增加后降低。稳态轧制力随初始厚度、压下率和轧辊温度变化呈近似线性变化，随轧制速度增加呈指数增加。初始厚度增加加大了表面和心部变形速度差及等效应变和应变速率的不均匀分布。相比压下率较小时的压缩变形，随着压下率增加剪切变形量增大，且轧辊热量更易传递至心部，变形更均匀。当轧制速度较大时，表面和心部等效应力、等效应变与等效应变速率差值显著增加，不利于均匀性变形。更多还原

【Abstract】 The finite element software DEFORM has been used to analyze the effects of initial thickness, roll temperature, reduction rate, and rolling speed on the distribution of contact pressure, speed, equivalent stress,equivalent strain, and equivalent strain rate during hot roll rolling of AZ31 magnesium alloy cold strip. The results show that the hot roller has a significant heating effect on the rolled piece, and the temperature of the rolled piece increases significantly. The temperature difference between the surface and the center first increases and then decreases. The contact pressure sharply increases and then decreases at the interface between the rigid end and the plastic deformation zone, and then increases again in the plastic deformation zone and decreases in the forward slip zone. The velocity and equivalent strain from the inlet end to the outlet end increase in an approximate S-shape, while the overall trend of equivalent stress and equivalent strain rate increases first and then decreases. The steady-state rolling force varies approximately linearly with the initial thickness, reduction rate, and roll temperature, and exponentially with the increase of rolling speed.The increase in initial thickness increases the difference in deformation velocity between the surface and core,as well as the uneven distribution of equivalent strain and strain rate. By comparing to compression deformation with a lower reduction rate, as the reduction rate increases, the shear deformation increases, and the heat of the roller is more easily transferred to the center, resulting in a more uniform deformation. When the rolling speed is high, the difference between the equivalent stress, equivalent strain, and equivalent strain rate at the surface and center increases significantly, which is not conducive to uniform deformation.更多还原