镁合金笔记本电脑外壳冲压模具设计

学号：201003040205HEBEIUNITEDUNIVERSITY毕业设计说明书GRADUATEDESIGN设计题目：镁合金笔记本电脑外壳冲压模具设计学生姓名：专业班级：10机设4班学院：机械工程学院指导教师：副教授2014年6月3日摘要-I-摘要本次设计通过分析笔记本电脑外壳的冲压工艺过程以及对镁合金的材料性能，设计出一套笔记本电脑外壳的冲压模具。镁合金是迄今在工程应用中最轻的结构材料，同时镁合金还具有高比强度和比刚度、尺寸稳定性好以及具有环保性等优点，具有很大的市场优势和广阔的发展前景。但是由于镁合金常温下不能拉深，通过查阅资料，可以通过同时加热模具和零件解决这个问题。用模具制造零件以其效率高，产品质量好，材料消耗低，生产成本低而广泛应用于制造业中。冲压是靠压力机和模具对板材、带材、管材和型材等施加外力，使之产生塑性变形或分离，从而获得所需形状和尺寸的工件(冲压件)的成形加工方法。冲压件与铸件、锻件相比，具有薄、匀、轻、强的特点。冲压可制出其他方法难于制造的带有加强筋、肋、起伏或翻边的工件，以提高其刚性。在冲压工艺过程设计中，从产品的结果和功能出发介绍了本次设计所需要的各个工序。由于对笔记本电脑外壳经行了一定的简化，所以拉深工序成为本次设计的重点。本次设计以拉深模具的设计例，对冲压模具的设计过程进行了介绍。关键词笔记本电脑外壳；镁合金；冲压；拉深模具Abstract-II-AbstractThisdesignthroughtheanalysisofthestampingprocessoflaptopshellprocessandmaterialpropertiesofmagnesiumalloy,designasetoflaptopshellstampingdie.Stampingpressanddiebythesheet,strip,pipeandprofilessuchasforce,toproduceplasticdeformationorseparation,thusobtainingthedesiredshapeandsize(Stamping)formingprocess.Comparedtostampingpartsandcastings,forgings,hasthecharacteristicsoflight,thin,uniform,strong.Stampingcanbepreparedbyothermethodsdifficulttoproducewithareinforcingrib,rib,theupsanddownsorfolded,toenhanceitsrigidity.Magnesiumalloysarethelighteststructuralmaterialinengineeringapplication,andmagnesiumalloyhashighspecificstrengthandspecificstiffness,gooddimensionalstability,andhastheadvantagesofenvironmentalprotection,hasalargemarketadvantagesandbroadprospectsfordevelopment.Butbecauseofmagnesiumalloyunderthenormaltemperaturecan'tdeepdrawing,throughaccesstoinformation,cansolvethisproblembyheatingmouldandpartsatthesametime.Withmoldmanufacturingpartsforitshighefficiency,productsofgoodqualityandlowmaterialconsumption,lowproductioncostandwidelyusedinmanufacturing.Intheprocessofstampingprocessdesign,fromproductaccordingtotheresultsandthefunctionofthisdesignintroducestheneedofallprocesses.Duetolaptopshellbythelinemustbesimplified,sothedeepdrawingprocessbecomethefocusofthisdesign.Indeepdrawingmoulddesignexample,thedesignofthestampingdiedesignprocessareintroduced.KeywordsLaptopshell;magnesiumalloy;stamping;Drawingdies目录-III-目录摘要.............................................................................................................................IABSTRACT..................................................................................................................II第1章绪论..................................................................................................................11.1选题背景.............................................................................................................11.1.1镁合金的特点及国内外研究现状...............................................................11.1.2模具概述.......................................................................................................21.1.3冲压工艺的分类及特点...............................................................................41.2设计研究方案.....................................................................................................61.3本次设计主要内容.............................................................................................6第2章镁合金的研究现状..........................................................................................72.1AZ31镁合金中合金元素的作用........................................................................72.1.1Al元素的影响...............................................................................................72.1.2Zn元素的影响..............................................................................................82.1.3其他元素的影响...........................................................................................82.2AZ31镁合金的组织及性能................................................................................82.3AZ31镁合金塑性加工技术................................................................................82.3.1挤压技术........................................................................................................92.3.2锻造技术.......................................................................................................92.3.3轧制技术.......................................................................................................92.3.4超塑性成形技术...........................................................................................92.4结论...................................................................................................................10第3章冲压工件的工艺分析....................................................................................113.1零件图................................................................................................................113.2结构工艺性分析...............................................................................................113.3毛坯尺寸的确定...............................................................................................123.3.1修边余量的确定.........................................................................................133.3.2毛坯尺寸的计算..........................................................................................133.4冲裁件的排样.........................................