金属板材平辊轧制工艺研究

摘要轧制温度、轧制速度和压下率等因素对镁合金轧制过程有重要影响。因此定量这些因素对镁合金板材轧制过程中的流动规律、开裂行为以及变形均匀性是保证镁合金轧制板材性能的关键。本文以AZ31B镁合金板材为研究对象，使用DEFORM-3D有限元模拟软件对镁合金板材的平辊轧制过程进行了有限元模拟，并利用有限元模拟获得的结果重点分析了工艺因素对轧制过程的影响。研究结果表明：压下率的减小、轧制速度的减小、轧制温度的升高均可以使轧制力降低；压下率减小，还可以使得轧后板材获得更高的应变均匀性；边裂损伤会随着压下率的减小、轧制速度的增加和轧制温度的降低而降低。从而提出AZ31B镁合金板材热轧时的最优方案：压下率20%，轧制速度0.5m/s，轧制温度350℃。25287
关键词镁合金工艺因素有限元模拟应变均匀性边裂损伤
毕业论文设计说明书外文摘要
Title   Study of Flat Rolling Technology of Metallic Sheet
Abstract
The factors such as rolling temperature, rolling speed and decrease of rolling reduction rate have important influence on the rolling process of magnesium alloy sheet . In order to guarantee the performance of rolled magnesium alloy sheet, it is the key to ensure the flow law, cracking behavior and deformation uniformity during rolling process of magnesium alloy sheet.AZ31B magnesium alloy sheet was chosen as the research object, DEFORM-3D finite element simulation software was used to do finite element simulation to the flat rolling process of magnesium alloy sheet. The results obtained by finite element modeling are used to do selective analysis of Technological factor’s influences on rolling process. The results which are obtained are: the decrease of reduction rate, the decrease of rolling speed and the increase of rolling temperature can all make the rolling force to decrease; Strain uniformity would increase along with decrease of rolling reduction rate ; Edge crack damage would decrease along with the decrease of rolling reduction rate, the increase of rolling speed and the decrease of rolling temperature. thus, the optimal scheme for hot rolling of AZ31B magnesium alloy sheet can be proposed: the rolling reduction rate is 20%, the rolling speed is 0.5m/s and the rolling temperature is 350℃.
Keywords Magnesium alloy Technological factor Finite element simulation   Strain uniformity    Edge crack damage
目录

1 绪论    1
1.1 引言    1
1.2 有限元模拟的应用现状    2
1.2.1 成形工艺多样化    2
1.2.2 材料种类多样化    3
1.2.3 材料组织多样化    3
1.3 轧制工艺的研究现状    4
1.3.1 温度的影响    4
1.3.2 变形量的影响    4
1.3.3 变形速度的影响    5
1.4 存在的问题    5
1.5 本课题的研究内容及目的意义    5
2 有限元模拟过程    6
2.1 软件介绍    6
2.2 几何模型的建立    6
2.3 有限元模型的建立    7
2.3.1 几何模型的导入    7
2.3.2 材料的定义    7
2.3.3 网格的划分    8
2.3.4 边界条件的设置    8
2.3.5 模拟参数的设置    9
2.4 有限元模拟方案    9
3 有限元模拟结果及讨论    11
3.1 轧制过程的分析    11
3.2 压下率对轧制过程的影响    13
3.2.1 压下率对轧制力的影响    13 金属板材平辊轧制工艺研究:http://www.751com.cn/cailiao/lunwen_18983.html