图书分类号TG376 密级非密UDC1_____________________________________________________________
硕士学位论文
铝合金叶片的成形工艺研究
指导教师（姓名、职称）张宝红女学生返乡养豪猪
申请学位级别工学硕士
专业名称材料加工工程干杯朋友歌词
论文提交日期 2011 年 04 月 28 日
论文答辩日期 2011 年 06 月 03 日
学位授予日期年月日
论文评阅人安红萍副教授王强教授
沁园春雪翻译
桃花妹妹答辩委员会主席刘建生教授
2011 年 06 月
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本人郑重声明：所呈交的学位论文，是本人在指导教师的指导下，独立进行研究所取得的成果。除文中已经注明引用的内容外，本论文不包含其他个人或集体已经发表或撰写过的科研成果。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本声明的法律责任由本人承担。
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铝合金叶片的成形工艺研究
摘要
本文所研究的铝合金叶片是某产品上的重要零件，外形形状比较简单，尺寸精度要求高，性能有一定要求。对于此类零件，目前国内一直用一定厚度的铝合金板材直接进行机械加工的方式制造。另外，也常用铝合金型材挤压的方式制造，即将铝合金板材直接热挤压后，切割出零件上的两个凸台。这两种制造方法材料、能源消耗大，生产成本高，不仅不符合节能降耗的发展要求，同时难以满足产品性能方面的要求。针对这些问题，本文对铝合金叶片进行了用“等温挤压”方法的研究。
根据零件的结构特征，对成形工艺进行分析。应用三维有限元数值模拟软件DEFORM，在建立简化模型基础上，分析了等温挤压成形过程中金属流动规律。首先讨论了凹模有无飞边槽对零件成形的影响，同时模拟了不同坯料形状以及坯料在凹模中放置于不同位置时的挤压情况。在此基础上分析了挤压过程中的金属流动、等效应力和载荷-行程曲线的变化。
在上述研究的基础上，设计了挤压模具，并进行了实验研究。结果表明：制定的工艺方案可行性好，设计的模具使用合理，金属流动均匀，零件充填效果较好，产品精度和性能均达到技术要求，抗拉强度可以达到480Mpa，为该类零件的工程化应用奠定了基础。
关键词：铝合金，叶片，等温挤压，三维有限元模拟，飞边槽，抗拉强度
The Molding technology rearch of Aluminum alloy blades
ABSRTACT
The Aluminum alloy blades which is rearched in this paper is the important parts of a product, the appearance shape of this parts is quite simple, the size accuracy requirement is high and the performance have certain requirements. For the parts, it currently has been mading by the way of a certain thickness plank is directly machine cutted processing. In addition，the manufacturing way of the aluminum profile extrusion also commonly ud, cutting out the two convex platform of the parts after the hot extrusion of the aluminum alloy plank namely. The material、energy consumption are of The two kinds of manufacturing methods are big,and the production cost of The two kinds of manufacturing methods is high, so it not only does not meet the development requirements of energy saving,but aslo difficult to meet the performance requirements. To solve the problems, The “i sothermal extrusion” method to the aluminum alloy blades was rearched.
Forming process were analyzed according to the structure characteristics of parts. Using the software DEFORM that is three-dimensional finite element numerical simulation, analyzed the metal flow pattern of the isothermal extrusion process after the simplified model is established. Firstly, disc
usd the influence of concave die for parts forming with the flash cave or without the flash cave, meanwhile, simulated extrusion situation of the blank with different shape and the different location of the blank put in the concave die. On this basis, analyzed the metal flow、equivalent stress and the change of Load - time curves of the extrusion process, sure the heating temperature of the extrusion of blank is 480℃、the temperature mould preheating is 450℃、the friction coefficient is 0.25、the punch running speed of 5 mm/s.
According to the above results, the extrusion mould was designed and the experimental reach was carried on. The result showed that: developed process plan was feasible,designed mould was appropriately applied,metal flow was uniform, and product precision and
白菜土豆汤performance all meet the technical requirements, the tensile strength can achieve 480Mpa, which laid the foundation for engineering applications of the similar parts.
长焦镜头推荐Keywords:Aluminum alloy, blades, isothermal extrusion,three dimensional finite element simulation, flasn cave, tensile strength
