LF2M铝合金T型三通管内高压成形影响因素研究

发布时间：2018-03-11 20:33

本文选题：T型三通管　切入点：内高压成形　出处：《南昌航空大学》2017年硕士论文　论文类型：学位论文

【摘要】：T型三通管作为空心结构件里最具典型的零件,近年来国内外学者对T型三通管从数值模拟到成形实验进行了大量研究。本文采用数值模拟结合实验,针对影响LF2M铝合金T型三通管内高压成形的主要3个因素进行研究,分别是进给量与内压、过渡圆角、摩擦与润滑。主要内容如下:(1)详细的介绍了T型三通管成形工艺过程及成形原理,影响T型三通管内高压成形的3个主要的因素分别为内压与进给量、过渡圆角及摩擦与润滑,对这3个主要因素进行了详细的介绍,并介绍了T型三通管内高压成形不同摩擦类型产生的3个区域,分别为导向区、过渡区及成长区。介绍CAE理论分析,并对有限元软件DYNAFORM进行了简单介绍。(2)建立了T型三通管的有限元模型,并采用1/4模型分析内压和进给量、过渡圆角及摩擦和润滑对成形的影响。模拟结果显示:在最大内压P=20MPa、进给量S=30mm、μ=0.06、过渡圆角R=4mm时得出的模拟结果最好。分析模拟结果得出:内压及摩擦是影响最小壁厚的关键因素,过大的过渡圆角需要添加背压力才能成形符合要求的零件。并分析了T三管高压成形过程中材料流动的趋势和成形缺陷。(3)针对传统润滑方式在T型三通管内高压成形上的不可行,提出新的润滑方式—基于局部摩擦控制的T型三通管内高压成形法。该方法通过分析T型三通管内高成形不同区域产生不同摩擦方式进行划分,分析不同区域润滑条件对成形的影响,采取不同的润滑方式。在该方式的基础之上,完成三通管内高压成形,发现在区域1进行润滑就能成形出符合要求的零件。(4)介绍了三通管内高压成形整个过程,从实验目的、实验设备、安装调试,到润滑剂选择、管坯下料,最后完成实验。通过实验结合数值模拟,分析内压与进给量、过渡圆角对成形质量的影响;在关键部位取点,观测在成形过程中壁厚的变化规律;在零件上等距离取点,比较模拟结果壁厚与实验结果壁厚分布规律,得出:支管顶部壁厚最小,在成形过程中逐渐减薄;直管底部壁厚最大,在成形过程中逐渐增加;过渡圆角壁厚在成形初期、中期逐渐增加,在成形后期、整形阶段逐渐减少。
[Abstract]:T-tube is the most typical part in hollow structure. In recent years, many scholars at home and abroad have done a lot of research on T-tube from numerical simulation to forming experiment. In this paper, the main factors affecting the high pressure forming of LF2M aluminum alloy T-way tube are studied, which are feed rate, internal pressure, transition angle, etc. Friction and Lubrication. The main contents are as follows: (1) the forming process and forming principle of T-type three-way tube are introduced in detail. The three main factors that affect the high-pressure forming of T-type three-way pipe are internal pressure and feed, transition angle, friction and lubrication, respectively. The three main factors are introduced in detail, and the three regions produced by different friction types in high pressure forming of T-shaped three-way pipe are introduced, which are the guide zone, the transition zone and the growth zone. The CAE theory analysis is introduced. The finite element model of T-type three-way tube is established by introducing the finite element software DYNAFORM. The 1/4 model is used to analyze the internal pressure and feed rate. The effects of transition angle, friction and lubrication on the forming. The simulation results show that the simulation results are the best when the maximum internal pressure is 20 MPA, the feed rate is 30 mm, 渭 n is 0.06 mm, and the transition angle is 4 mm. The results show that the internal pressure and friction are the key factors affecting the minimum wall thickness. It is necessary to add back pressure in order to form the parts which meet the requirements. The trend of material flow and forming defect during high pressure forming of T-tube are analyzed, and the high pressure of traditional lubrication mode in T-tube is analyzed. Forming is not feasible, A new lubrication method based on local friction control is proposed in this paper. This paper analyzes the influence of lubrication conditions in different regions on forming, and adopts different lubrication methods. On the basis of this way, the high pressure forming of three-way pipe is completed. It is found that lubrication in area 1 can produce parts that meet the requirements.) the whole process of high pressure forming in three-way pipe is introduced, from experimental purpose, experimental equipment, installation and debugging, to lubricant selection, tube blanking, Finally, the experiment is completed. Through the experiment and numerical simulation, the influence of internal pressure and feed rate, transition angle on forming quality is analyzed, and the variation of wall thickness in the process of forming is observed by taking points at the key position, and at the same distance on the parts. By comparing the distribution of the wall thickness between the simulation results and the experimental results, it is concluded that the top wall thickness of the branch pipe is the smallest, the thickness of the bottom wall of the straight pipe decreases gradually during the forming process, the thickness of the transition corner wall increases gradually during the forming process, and the thickness of the transition corner wall is at the beginning of the forming process. The middle stage gradually increased, and in the later stage of shaping, the plastic stage gradually decreased.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG39;U466

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