变厚度轧制对AZ31镁合金板材边部损伤影响分析

Analysis of variable gauge rolling impact on the edge damage of AZ31 magnesium alloy sheets

摘要:

本文基于变厚度轧制工艺理论,利用DEFORM-3D软件对AZ31镁合金板材轧制边部损伤行为进行分析。设定轧制温度为350℃,轧辊转速为20r/min,先对3组试样进行压下量分别为板厚的37.5%,75%和112.5%立轧预变形；随后进行小压下量多道次或大压下量单道次的平辊轧制。结果表明：对镁合金板采用变厚度轧制工艺能显著减少其边部损伤；立辊侧压量为37.5%时效果最好,其最大损伤因子为0.35；变厚度轧制工艺更适用于大压下轧制,当立辊侧压量为75%,平辊压下量为49%时最大损伤因子最小,仅为0.126；侧压量的取值与板厚有关。

Abstract:

This paper investigated the damage behavior of AZ31 magnesium alloy plate by numerical simulation method by finite element software DEFORM, which is based on variable gauge rolling. The rolling temperature of magnesium plate is 350℃,the rolling speed is 20r/min and the lateral pre-deformation by vertical roll are 37.5%,75% and 112.5%, respectively. Then the specimens that have been pre-deformation are rolled by flat roll with multi cycles of small reduction or single cycle with a large deformation. The results showed that the variable gauge rolling process can significantly reduce edge damage of rolled magnesium plate. When vertical roll reduction is 75%, the variable gauge rolling process reach the best, and that the maximum edge damage factor is 0.35. Variable gauge rolling process seems to more suitable for large reduction rolling. The maximum damage factor is only 0.126 when vertical reduction is 75% and flat reduction is 49% were combined to produce magnesium plate. The value of vertical roll reduction was related to the initial thickness of magnesium plate.