回转角对AZ31镁合金管材冷轧成形过程的影响

Influence of Rotation Angle on the Cold Rolling Forming Process of AZ31 Magnesium Alloy Tubes

摘要:

回转角是三辊式冷轧无缝管材过程中的关键工艺参数,本文以冷轧AZ31镁合金管材为研究对象,通过对不同回转角下的冷轧过程进行了完整的仿真,对比分析了不同回转角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,结果表明随着回转角的增大,等效应力、等效塑性应变以及节点温度均增大。借助元胞自动机模型以及实验等手段,通过实验与数值仿真结果对比分析,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,获得了50°的回转角可以更好的满足工艺要求,为镁合金管材冷轧成形回转角的选择提供依据。

Abstract:

Rotation angle is a key parameter in the processing of three-roller, cold-rolled seamless steel tubes. Using a cold-rolled AZ31 magnesium alloy tube as the research object .Based on the cold-rolling process under different rotation angles, the present paper conducts a comparison and analysis of the effects of different rotation angles on the characteristics of the deformation equivalence effect force, equivalent plastic strain and regularity of the influence of node temperature. Our study shows that increased rotation angles increase the equivalent stress, equivalent plastic strain and node temperature. With the aid of the automaton model and experimental means ,through the experiment and numerical simulation results contrast analysis, the author finds out the grain produced in the process of rolling in the continuous refinement of recrystallization and preliminary organization evolution law. The results reveal that a 50° rotation angle can sufficiently meet technical requirements and provide evidence for the appropriate selection of rotation angles for cold-rolled magnesium alloy tubes.