轧制速度对AZ31镁合金管材冷轧成形的影响

轧制速度是三辊式冷轧成形过程中关键的工艺参数，决定其力学特征及温升情况。基于此，本文以冷轧AZ31镁合金管材为研究对象，通过全流程数值仿真计算，对比分析不同轧制速度在各特征变形段对等效应力、等效塑性应变及节点温度的影响规律。结果表明，等效应力、等效塑性应变及节点温度均随轧制速度的增大而增大。通过元胞自动机模型及实验等手段，探明了晶粒在轧制过程中产生连续再结晶并细化的初步组织演变规律；对比分析实验与模拟结果并结合多方面因素，得到800mm/s的轧制速度可以更好的满足工艺要求的结果，为冷轧镁合金管材轧制速度的选择提供依据。

Effect of rolling speed on cold rolling forming of AZ31 magnesium alloy tubes

The rolling speed is the key process parameter in the three-roll cold rolling forming process, which determines its mechanical characteristics and temperature rise. Based on this phenomenon, this paper takes cold-rolled AZ31 magnesium alloy tubes as the research object, by numerical simulation, compares and analyzes the influence of different rolling speeds on the equivalent stress, equivalent plastic strain and joint temperature of each characteristic deformation section. The results show that these parameters increased with the increase of rolling speed. By means of the cellular automaton model and experiment, the preliminary evolution law of continuous recrystallization and refinement of the grain during the rolling process was proved. The comparative analysis experiment and simulation results were combined with various factors to obtain 800mm/s. The rolling speed can better meet the requirements of the process requirements, which provides a basis for the selection of rolling speed of cold-rolled magnesium alloy tubes.