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照相机外壳注塑模具设计论文[带图纸].doc

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照相机外壳注塑模具设计论文[带图纸].doc

照相机外壳注塑模具设计摘要塑料注射模具是工业生产的基础工艺设备,在电子、汽车、电机、电器、仪表、家电和通讯等产品中,60~80的零部件,都要依靠模具成形。它不仅直接影响工业产品的水平,也是一个国家工业化程度和机械制造工业技术水平的综合体现。照相机外壳是一类体积适中,形状、结构较为简单的塑料零件。根据照相机外壳的结构确定模具的结构方案,利用塑件的三维零件图,确定模具的主要结构方式,进而画出其模具的CAD装配图和零件图。通过对塑件的结构分析,本次设计采用一模四腔设计,滑块侧抽芯机构,实现照相机外壳侧孔的生成采用侧浇口形式塑件的体积适中,采用推杆推出实现脱料。采用此模具结构不仅可以保证塑件的表面要求和尺寸精度,而且生产率高、成本低、结构简单,可行性强,是一副实用性很强的模具。关键词注塑模具照相机外壳塑件斜滑块ThecamerashellinjectionmolddesignAbstractPlasticinjectionmouldisthebasisofprocessequipmentinindustrialproduction,intheelectronic,automobile,motor,electricalappliance,instrument,homeappliancesandcommunicationproducts,6080oftheparts,mustrelyonformingdie.Itnotonlydirectlyaffectthelevelofindustrialproducts,isacomprehensivereflectionofacountryindustrializationandmachinerymanufacturingindustrytechnicallevel.Camerahousingisakindofmediuminsize,shape,simplestructureofplasticparts.Accordingtothecamerashellstructuredeterminethestructureschemeofthemould,plasticpartsofthe3Dpartdrawings,themainstructureofdies,andthendrawtheproductionofplasticpartsCADpartsandassemblyplans.Throughthestructuralanalysisofplasticparts,thedesignadoptsthedesignofamoldfourcavity,slantedslideblockcorepullingmechanism,realizationofgeneratingcamerahousingsideholethesidegatemoderatevolumeofplasticparts,thepushrodisintroducedtoachievestripping.Thediestructurecannotonlyensurethesurfacerequirementsofplasticpartsandprecision,andhighproductivity,lowcost,simplestructure,strongfeasibility,isaverypracticalmould.KeywordsinjectionmoldcamerahousingplasticpartsObliqueslippery主要符号表G注塑机的实际最大注射量,3cm或gT注塑机的额定锁模力,tq熔融塑料在模腔内的压力,2cmkgS注射机开模行程,mm塑料的平均收缩率制品的设计公差z模具制造公差xA型芯或成型孔中心距gA制品孔或凸台中心距1P动模板受的总压力,MPaF塑件浇注系统在动模上的投影面积,2mmP型腔压力,一般取2545MPa,取32MPaE塑料的弹性模量,2cmN塑料的成型收缩率,查表取5.0型芯的脱模斜度,为1°塑料的泊松比,查表得394.0k与及有关的系数,sincos1k塑料与型芯间的静摩擦因数max推杆最大应力,2cmNc型芯成型部分的平均周长,mmh型芯被塑料包紧部分的长度,mmp单位面积的包紧力,MPamax推杆最大应力,2cmNcF抽芯力,Nvq冷却介质的体积流量,min/3mW单位时间(每分钟)内注入模具中的塑料质量,min/kg1Q单位重量的塑件在凝固时所放出的热量,kgkJ/冷却介质的密度,3/mkg1c冷却介质的比热容,/187.41℃kgkJcvq冷却介质的体积流量,sm/3h冷却管道孔壁与冷却介质之间的传热膜系数,/2℃hmkJ模温与冷却介质温度之间的平均温差,℃I目录1绪论.........................................................................................................................11.1概述......................................................................................................................11.2模具发展现状及发展方向..................................................................................11.2.1塑料模具工业的发展现状及方向...............................................................11.3本课题的内容和具体要求..................................................................................31.3.1本课题的内容...............................................................................................31.3.2具体要求.......................................................................................................32模具方案的论证和选择....................................................................................42.1ABS注射成型的原理及工艺过程.....................................................................42.1.1注射成型的原理...........................................................................................42.1.2注塑成型工艺过程.......................................................................................42.1.3注射成形工艺参数.......................................................................................42.2注塑模具的基本组成.........................................................................................42.2.1基本组成.......................................................................................................52.2.2注塑模具装配图的技术要求.......................................................................53注射机的选择和型腔数目的确定及分布...................................................63.1塑件材料的选择..................................................................................................63.2塑件的基本资料..................................................................................................63.2.1产品资料.......................................................................................................63.3ABS注射工艺性..................................................................................................63.4型腔数目的确定及分布......................................................................................73.5注射机的选择......................................................................................................83.5.1注射量的校核...............................................................................................83.5.2锁模力的校核...............................................................................................83.5.3最大注射容量校核.......................................................................................93.5.4注射压力校核...............................................................................................93.5.5模具厚度的校核...........................................................................................93.5.6开模行程的校核...........................................................................................93.6分型面的选择原则............................................................................................103.6.1分型面的选择原则.....................................................................................103.6.2分型面的分类.............................................................................................103.6.3分型面的确定.............................................................................................104排气系统的设计................................................................................................12II5浇注系统的设计................................................................................................135.1浇注系统设计的原则........................................................................................135.1.1了解塑料的成型特性.................................................................................135.1.2布局合理.....................................................................................................135.1.3防止型芯和塑件的变形.............................................................................135.1.4减小流程及塑料耗量.................................................................................135.1.5排气良好.....................................................................................................135.1.6修整方便,保证塑件外观质量.................................................................135.2主流道设计........................................................................................................135.3冷料穴设计........................................................................................................145.4分流道设计........................................................................................................145.5浇口设计............................................................................................................145.5.1浇口的主要作用.........................................................................................155.5.2浇口位置的选择原则.................................................................................155.6浇口套的选择....................................................................................................156拉料杆的设计.....................................................................................................167成型零件的设计................................................................................................177.1凹模、凸模的结构设计....................................................................................177.1.1凹模的结构设计.........................................................................................177.1.2凸模的结构设计.........................................................................................177.2成形零件钢材选用............................................................................................177.2.1成形零件对钢材的要求.............................................................................177.3成型零件工作尺寸............................................................................................177.3.1工作尺寸分类和确定.................................................................................177.3.2影响塑件尺寸精度的因素如下。.............................................................187.4成型零件工作尺寸的计算................................................................................197.4.1凹模尺寸计算.............................................................................................197.4.2凸模和型芯的尺寸计算.............................................................................197.4.3型芯中心距或成型孔中心距尺寸计算.....................................................207.5动模板强度校核................................................................................................208脱模机构的设计................................................................................................228.1脱模机构的基本要求........................................................................................228.2脱模机构的设计原则........................................................................................228.3推出机构的确定................................................................................................228.4脱模力的计算....................................................................................................22

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