蜜饯盒注塑模具设计

毕业设计(论文)任务书题目蜜饯盒注塑模具设计起讫日期学生姓名专业班级所在院系指导教师职称所在单位模具设计2011年10月10日摘要此毕业设计课题的制品的名称为“蜜饯盒”，是用于放置果脯的盒子。制品材料为：PS（聚苯乙烯），聚苯乙烯为无色、无味的透明刚性固体，透光率可达88%～90%，制品质硬，落地时会有金属般的响声。聚苯乙烯的密度在1.04～1.07之间，尺寸稳定性好，收缩率低。聚苯乙烯容易燃烧，点燃后离开火源会继续燃烧，并伴有浓烟。在设计模具时需要考虑制品的材料的一些特点。制品的外形尺寸和内部结构尺寸大部分是按照标准系列来定的，在模具设计时尽量使用标准件。通过分析制品外形特点和材料特性选择合适的分型面。根据相关计算选择的注射机型号为XS-ZY-125。。浇注系统由主流道、分流道、浇口及冷料穴等四部分组成。主流道的形状为圆锥形，以便熔的流动和开模时主流道凝料的顺利拔出。主流道的尺寸直接影响到熔体的流动速度和充模时间。另外，由于其与高温塑料熔体及注塑机喷嘴反复解除，因此设计中场设计成可拆卸更换的浇口套。。该塑件要求不允许有裂纹和变形缺陷，表面质量要求较高。采用一模四腔注射，为便于调整冲模时的剪切速率和封闭时间，因此采用侧浇口。其截面形状简单，易于加工，便于试模后修正，且开设在分型面上，从型腔边缘进料。塑件注射成型后，塑件在模内冷却定型，由于体积收缩，对型芯产生包紧力，当其从模具中推出时，就必须克服因包紧力而产生的摩擦力。对底部无孔的筒、壳类塑件，脱模推出时还要克服大气压力。型芯的成型端部，一般均要设计脱模斜度，另外，塑件刚开始脱模时，所需的脱模力最大，其后，推出力的作用是克服推出机仅仅是为构移动的摩擦力。本塑件采用推杆脱模方式。最后，在计算机上用CAD绘图软件画出装配图和所有的零件图，并标注尺寸，技术要求极其制造标准。关键词：模具设计蜜饯盒注塑模具AbstractThegraduationsubjectproductnameispreservesbox,isusedtoplacethedriedfruitofthebox.Productmaterials:PS(polystyrene),polystyreneisacolorless,odorless,transparentrigidsolid,88%lighttransmissionrateofupto90%,systemquality,hard,landingtherewillbemetal-likesound.Thedensityofpolystyreneisbetween1.04to1.07,gooddimensionalstability,lowshrinkage.Polystyreneiseasytoburn,litthefiresourcewillcontinuetoburnout,accompaniedbysmoke.Needtobeconsideredinthedesignofthemoldproducts,somecharacteristicsofthematerial.Thedimensionsandsizeoftheinternalstructureoftheproductsaremostlyofthestandardseries,inthemolddesign,itisbettertomakeuseofstandardpartsasmanyaspossible.Byanalyzingthephysicalcharacteristicsandmaterialpropertiesoftheproducts,wecanselecttheappropriatesub-surface.BycalculatingIchoicetheXS-ZY-125astheinjectionmachinemodel.Fromthemainchannelgatingsystem,shunt,gateandcoldmaterialpointscomposedoffourparts.Theconicalshapeofthemainchannelisgoodfortheflowofmeltandpouringmoldmaterialwhenthemainchannelsmoothpullup.Mainchanneldirectlyaffectsthesizeofthemeltflowrateandfillingtime.Inaddition,becauseofitshigh-temperaturemeltandplasticinjectionmoldingmachinenozzlerepeatedlylifted,sothedesignmidfielddesignedtoreplacetheremovablegatesets..Thisrequirementdoesnotallowplasticdeformationdefectsandcracks,thesurfacequalityrequirements.Ichoosefour-cavitymoldinjection,tofacilitateadjustmentoftheshearrateanddieatclosingtime,Ichoosesidegate.Thecross-sectionalshapeissimple,easyprocessing,easytofixafterthetryout,andtheopeninginthesub-typesurface,thefeedfromtheedgeofthecavity.Aftertheinjectionmoldingofplasticparts,plasticpartsinthemoldcooling,duetovolumecontraction,tightpackageofcorepowergeneration,whenitwasintroducedfromthemold,itmustovercomethebagtightfrictionforcegenerated.Onthebottomofthebarrel,non-porous,shelltypeplasticparts,moldreleasewhentheyovercometheatmosphericpressure.Coreofthemoldingends,generallytodesignstrippingslope,theother,thebeginningplasticpartsejection,theejectionforcerequiredforthelargest,followedbytheintroductionoftheroleofforceisintroducedtoovercomethemachineonlyfortheorganizationmovingoffriction.TheplasticpartsareputtingStripping.Finally,useCADtodrawallofthepartsassemblydrawingsanddiagrams,anddimensioning,technicalrequirementsverymanufacturingstandards.Keywords:injectionmold,molddesign,preservesbox目录第一章绪论...........................................错误!未定义书签。1.1模具在加工工业中的地位.............................错误!未定义书签。1.2模具的发展趋势.......................................错误!未定义书签。1.3国外注塑模的研究现状及发展趋势.........................................21.4课题的研究意义.....................................................41.5设计（论文）的主要内容.............................................61.6总结...............................................................6第二章塑件分析及分型面的设计.........................................72.1ps的性能..........................................................82.2蜜饯盒（ps）的外形尺寸............................................122.3注塑设备的选择....................................................102.31估算塑件体积.....................................................102.32注射机型号的确定.................................................10第三章浇注系统的设计................................................133.1主流道的设计......................................................133.2分流道的设计......................................................143.3浇口的设计........................................................153.4校核主流道的剪切速率..............................................163.5冷料穴的设计及计算................................................16第四章成型零件的结构设计及计算.......................................174.1成型零件的结构设计................................................174.2成型零件材料的选用................................................174.3成型零件工作尺寸的计算............................................174.4成型零件尺寸及动模垫板厚度的计算..................................224.5排气系统的设计....................................................234.6导向结构的设计....................................................234.7推出机构的设计....................................................244.7.1推出方式的确定..................................................244.7.2脱模力的计算....................................................244.8冷却系统的设计....................................................24谢辞............................