机械模具专业本科毕业设计（论文）外文翻译-注塑机

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1、本科毕业设计（论文）外文翻译题目电风扇上盖注塑成型模具设计学院机电工程学院专业机械工程及自动化班级05机自本一学号学生姓名指导教师温州大学教务处制外文资料来源及题目模具专业英语，王浩钢等主编，人民邮电出版社译成中文后题目（译文附后）注塑模具指导教师审阅意见：签名：年月日TheInjectionMolding1、TheinjectionmoldingInjectionmoldingisprincipallyusedfortheproductionofthethermoplasticparts,althoughsomeprogresshasbeenma

2、deindevelopingamethodforinjectionmoldingsomethermosettingmaterials.Theproblemofinjectionamethodplasticintoamoldcavityfromareservoirofmeltedmaterialhasbeenextremelydifficulttosolveforthermosettingplasticwhichcureandhardenundersuchconditionswithinafewminutes.Theprincipleofinject

3、ionmoldingisquitesimilartothatofdie-casting.Theprocessconsistsoffeedingaplasticcompoundinpoweredorgranularformfromahopperthroughmeteringandmeltingstagesandtheninjectingitintoamold.Afterabriefcoolingperiod,themoldisopenedandthesolidifiedpartejected.Injection-moldingmachineopera

4、tion.Theadvantageofinjectionmoldingare：（ⅰ）ahighmoldingspeedadapterformassproductionispossible；（ⅱ）thereisawidechoiceofthermoplasticmaterialsprovidingavarietyofusefulproperties；（ⅲ）itispossibletomoldthreads,undercuts,sideholes,andlargethinsection.2、Theinjection-moldingmachineSeve

5、ralmethodsareusedtoforceorinjectthemeltedplasticintothemold.Themostcommonlyusedsysteminthelargermachinesisthein-linereciprocatingscrew,asshowninFigure2-1.Thescrewactsasacombinationinjectionandplasticizingunit.Astheplasticisfedtotherotatingscrew,itpassesthroughthreezonesasshown

6、：feed,compression,andmetering.Afterthefeedzone,thescrew-flightdepthisgraduallyreduced,forcetheplastictocompress.Theworkisconvertedtoheatbyconductionfromthebarrelsurface.Asthechamberinfrontofthescrewbecomesfilled,itforcesthescrewback,trippingalimitswitchthatactivatesahydraulicc

7、ylinderthatforcesthescrewforwardandinjectsthefluidplasticintotheclosedmold.Anantiflowbackvalvepresentsplasticunderpressurefromescapingbackintothescrewflight.Theclampingforcethatamachineiscapableofexertingispartofthesizedesignationandismeasuredintons.Arule-of-thumbcanbeusedtode

8、terminethetonnagerequiredforaparticularjob.Itisbasedontwotons