【作者】 姜涛；

【导师】 沈洪； 陆朝阳；

【作者基本信息】 上海交通大学 ， 机械工程（专业学位）， 2016， 硕士

【摘要】 铝锂合金具有低密度、较高的强度、较好的抗腐蚀性以及抗疲劳性的特性。因此铝锂合金受到了航空业的广泛关注,被大量使用到现代飞机上。然而,铝锂合金因其强度及硬度较高,造成成形困难。在C919飞机的设计中,铝锂合金的难加工性大大限制了其使用。因此,对铝锂合金成形工艺进行研究具有重要的应用价值。本文以2196-T8511和2099-T83两种铝锂合金为研究对象,研究其热压下陷成形工艺。首先通过标准条件下的单向拉伸实验得到了不同温度下的材料应力-应变曲线。基于不同温度下硬度值及延伸率的研究,建立热压下陷的最佳成形温度区间。基于商业有限元仿真软件PAMSTAMP,分析了不同温度对下陷成形过程中的应力分布和回弹量的影响规律。利用现场的冷压成形与热压成形对比冲压实验,明确了铝锂合金只能使用热压下陷而不可以使用冷压下陷,同时也验证了所建有限元模型的有效性。通过仿真与现场试验的研究,得出材料下陷回弹的规律,为模具的回弹补偿设计提供理论研究。最后,对成形工装模具型面回弹补偿进行理论研究,为生产中模具设计作指导。更多还原

【Abstract】 Al Li alloy has low density,high strength,good corrosion resistance and fatigue resistance.So Al Li alloy has been widely concerned by the aviation industry,and has been widely used in modern aircraft.However,because of its high strength and hardness,Al Li alloy is difficult to form.In the design of the C919 aircraft,the forming difficulty of the Al Li alloy greatly limits its use.So the research on the processing technology of Al Li alloy is of great significance.In this paper,2196-T8511 and 2099-T83 of two aluminum lithium alloy as the research object,study the forming process of heat sink.The stress-strain curves of the materials under different temperatures are obtained by using the standard tensile test at different temperatures.Under different temperature hardness and elongation rate based on the research,establish the best heat sink of the forming temperature range.Based on the commercial finite element software simulation PAMSTAMP,different temperature on subsidence forming force distribution and the amount of springback were studied in the process of stress is analyzed.Use the site of the cold pressure forming and hot forming contrast stamping experiments,clear the aluminum lithium alloys can only use heat sink and may not use cold pressed subsidence,and also validates the validity of the finite element model is established.Through the study of simulation and field tests,draw materials sinking springback law,take theoretical research in the die springback compensative design.In the end,the theoretical research on the springback compensation of the die surface is carried out.更多还原