压铸模具毕业论文[1]

I摘要压力铸造是目前成型有色金属铸件的重要成型工艺方法。压铸的工艺特点是铸件的强度和硬度较高，形状较为复杂且铸件壁较薄，而且生产率极高。压铸模具是压力铸造生产的关键，压铸模具的质量决定着压铸件的质量和精度，而模具设计直接影响着压铸模具的质量和寿命。因此，模具设计是模具技术进步的关键，也是模具发展的重要因素。根据零件的结构和尺寸设计了完整的模具。设计内容主要包括：浇注系统设计、成型零件设计、抽芯机构设计、推出机构设计以及模体结构设计。根据铸件的形状特点、零件尺寸及精度，选定了合适的压铸机，通过准确的计算并查阅设计手册，确定了成型零件以及模体的尺寸及精度，在材料的选取及热处理要求上也作出了详细说明，并在结合理论知识的基础上，借助于计算机辅助软件绘制了各部分零件及装配体的立体图和工程图,以保障模具的加工制造。根据有关资料，采用扁平侧面浇注系统，降低了浇注时金属液对型芯的冲击，确定了铸造工艺参数：铸件加工余量取0.1～0.75mm，收缩率为0.4～0.7﹪，脱模斜度为25′～45′。模具整体尺寸为900×640×835mm，符合所选压铸机安装空间。抽芯采用斜滑块机构，拼合形式为两瓣式。推出机构采用4根端面直径26mm的圆截面推杆，推杆兼复位杆作用。经计算，推杆受力符合要求。通过电脑模拟显示，模具能够正常工作，开启灵活。关键词：压力铸造；压铸模具；锌合金铸件；底盘座IIAbstractDie-castingmoldingtechnologyisplayingakeyroleinnon-ferrousmetalstructureformingprocesses.Die-castingprocess’sfeaturesarethestrengthandhardnessofdiecastingonhigh,thin-walledcastingswithcomplexshapecanbecast,andtheproductionisefficient.Thedie-castingdieisthekeyfortheprocessofdiecasting,itsqualitydecidesthequalityandaccuracyofcastings,andthedesignofthedie-castingdieaffectsitsqualityandoperatinglifedirectly.Therefore,designingthedie-castingdieisthekeytotechnologicalprogress;itisalsoanimportantfactorinthedevelopmentofmold.Basedmainlyonpartsofthedesignintegrityofthestructureandsize,itschemeouttherequiredspareparts.Designelementsinclude:designofgatingsystem,formingpartdesign,core-pullingmechanismdesign,theejectordesignandthemoldbodystructuredesign.Accordingtotheshapeoffeatures,partssizeandaccuracy,theauthorselectedtheappropriatediecastingmachine,throughtheexactlycalculateandconsultdesignhandbooks,confirmthesizeandaccuracyoftheformingpartandmoldbodystructure,italsomakesparticularinstructiononthematerialselectionandtherequirementsoftheheattreatment,withtheoreticalbasis,plottingoutpictorialdrawingandcastingdrawingofthepartsbyusingcomputersoftwaretoensurethemanufactureofdie-castingdie.Basedonthedatum,useflatsidegatingsystemwhichcanreducepouringmoltenmetalontheimpactofcores,itensurethetechnologicalparameterofthemold:theallowanceofthecastingwas0.1～0.75mm,shrinkageratewas0.4～0.7﹪,draftanglewas25′～45′.Thesizeofthedie-castingmoldwas900×640×835mm,whichsatisfythespaceofthediecastingmachinewhichischosen.Thecore-pullingmechanismofthemoldwasoptionalsideslidercore-pullingmechanism,Introducedorganizationsselectedtwopushplate.Thediameteroftheejectorpinwithacylindricalheadwas26mm,andwasalsousedasreturnpin.Thestressoftheejectorpinwasconformancetotherequirementbycalculate.Thesimulationbycomputershowsthatthemoldworksfunctionnormally,anditcandexterousandquicklytoopen.Keywords:diecasting;die-castingmold;zincalloycastings;subbaseIII目录摘要.......................................................................................................................................IAbstract.....................................................................................................................................II第1章绪论..............................................................................................................................11.1课题意义......................................................................................................................11.1.1压力铸造的特点..............................................................................................11.1.2压铸模具设计的意义.......................................................................................21.2压铸发展历史、现状及趋势......................................................................................21.2.1压铸的发展历史...............................................................................................21.2.2我国压铸产业的发展.......................................................................................31.2.3压铸产业的发展趋势.......................................................................................41.3毕业设计内容..............................................................................................................5第2章压铸模具的整体设计..................................................................................................72.1铸件工艺性分析.........................................................................................................72.1.1铸件立体图及工程图......................................................................................72.1.2铸件分型面确定..............................................................................................82.1.3浇注位置的确定..............................................................................................82.2压铸成型过程及压铸机选用.....................................................................................92.2.1卧式冷室压铸机结构......................................................................................92.2.2压铸成型过程................................................................................................102.2.3压铸机型号的选用及其主要参数.................................................................112.3浇注系统设计...........................................................................................................112.3.1带浇注系统铸件立体图................................................................................112.3.2内浇口设计....................