下载

1下载券

加入VIP
  • 专属下载特权
  • 现金文档折扣购买
  • VIP免费专区
  • 千万文档免费下载

上传资料

关闭

关闭

关闭

封号提示

内容

首页 手机外壳注射成形塑料模具设计毕业论文

手机外壳注射成形塑料模具设计毕业论文.doc

手机外壳注射成形塑料模具设计毕业论文

张一叶
2017-09-19 0人阅读 举报 0 0 暂无简介

简介:本文档为《手机外壳注射成形塑料模具设计毕业论文doc》,可适用于人文社科领域

手机外壳注射成形塑料模具设计毕业论文机电职业技术学院机械工程系模具设计与制造专业设计论文题目:手机外壳模具设计班级:模具设计与制造姓名:指导老师:吴志明完成时间:机电职业技术学院目录第章绪论(注射成形基本过程…………………………………………………………(注射模的基本结构……………………………………………………第章手机外壳的造型设计…………………………………………………手机外壳的选料及其性能………………………………………………手机外壳注射成型工艺过程……………………………………………………手机外壳的结构分析……………………………………………………手机外壳造型设计过程………………………………………………………第章注射机的选择…………………………………………………………………注射机规格…………………………………………………………………注射机的校核………………………………………………………………注射机注射容量校核…………………………………………………注射机锁模力校核……………………………………………………注射机注射压力校核…………………………………………………注射机模具厚度校核…………………………………………………注射机最大开模行程校核……………………………………………第章成型零件与浇注系统的设计………………………………………………凹、凸模成型零件的设计…………………………………………………加载参照模型…………………………………………………………成型零件设计…………………………………………………………浇注系统设计…………………………………………………………………主浇道的设计…………………………………………………………分浇道的设计…………………………………………………………浇口及冷料穴设计……………………………………………………铸模和开模……………………………………………………………冷却系统设计………………………………………………………………凹、凸模冷却系统设计………………………………………………第章模具零件设计…………………………………………………………………推出系统设计………………………………………………………………确定模架……………………………………………………………………模架各装配零件设计………………………………………………………导向零件设计………………………………:机械工业出版社(王鹏驹主编塑料模具技术手册北京:机械工业出版社(申树义等编塑料模具设计北京:机械工业出版社附录二外文翻译TreatingandthemodernmouldmakehighspeedOne,summarizesthepresentsituationthatthemouldmakesatpresentandtrendThemouldisimportanthandicraftequipment,occupiesdecisivepositioninindustriddepartmentssuchasconsumergoods,electricalequipmentelectron,automobile,aircraftfabricationThemouldisimportanthandicraftequipment,occupiesdecisivepositioninindustriddepartmentssuchasconsumergoods,electricalequipmentelectron,automobile,aircraftfabricationIndustrialproductpartroughprocess,thefinishmachiningandplasticpartwillbecompletedfromthemouldTheChinesemouldmarketdemandalreadyreachesscaleofhundredmillionyuanatpresentTheautomobilemould,theannualgrowthratecoveringpieceofmouldespeciallywillexceedAlsopromptbuildingmaterialmoulddevelopment,variousheterotypematerialthemould,wallsurfaceandfloormouldbecomenewmouldgrowthpoint,plasticdoorsandwindowsandplasticdrainpipeincreasetoexceedingbyintheupcomingseveralyearsThehomeappliancemouldannualgrowthratewillexceedTheITindustryyearincreasesspeedequallyexceeding,theneedtothemouldaccountsforofmouldmarketplaceannualChinesemachinetoolsimplementsindustryoutputvaluewillcontinuetoincreaseOurcountrymouldfabricationmarketpotentialisenormousThebasisdatacounts,inrecentyears,ourcountrymouldyeargrossoutputvaluereachesbillionUSdollar,entranceexceedsbillionUSdollar,exceedmillionUSdollaroutletIncreasebyfromtoincreasetoofTheexpertforetellsthatabroad:Asiaportionbeingoccupiedbyinmouldfabricationinthewholeworld,willfromtoincreasetoofChinesemouldindustryhasbeenexpandingbyleapsandbounds,hasformedeastChinaandtwobigSouthChinabases,andhasexpandedgraduallyarrivingatotherprovinceIn(Shandong,Anhui,Sichuan)in~,mouldmanufacturingindustryoutputvalueannualaveragegrowth,growsbyinInourcountrymouldoutputvalueisbillionRMBThegrossproductplaceoccupiestheworldtherd,exportsamouldincreasescomparedtolastyear,,USdollarBut,contentslowourcountrytechnologymouldsalreadypileupinexcessofrequirement,verymostsupportofaccurate,complicatedtopgrademouldimportsEveryyeartheentrancemouldexceedsbillionUSdollarExceedmillionUSdollaroutletPrecisemouldaccuracyrequiresthatmums,largescalemouldsrequirethatsatisfiedkNagreewellwithmodelforceinjectionmachinerequestin~TheminitypemouldneedstherequestsatisfyingthediametermmsilentstocktubeAtpresent,adoptquickcuttingtoproduceamouldalreadybecomingthegeneraltrendthatthemouldmakes,afewmouldshaveproducedamanufacturerinabroad,highspeedmachinetoollargeareahassubstitutedtheelectricsparkmachinetool,quickcuttinghasimprovedthemouldefficacygreatlyMachinetoolenterpriseaimsatmouldmanufacturingenterprises,sometreatingcentresallaboveofthemachinetoolproducingafactorysellstreatingenterprisetoamouldThemouldfabricationenterprisesubstitutingtheelectricsparkfinishmachiningmouldgraduallyinabroadhasadoptquickcuttingalreadycommonly,quickcuttinghasproducedamouldalreadybecomingthegeneraltrendthatthemouldmakesgradually,hasimprovedthemouldefficacyandmassgreatlyAdoptquickcuttingtoreplaceelectricsparkproducingamould,cangetonthestickobviously,improvesmouldaccuracy,lifetimegrowinghighspeedprocessesapplicationinmakinginthemouldquickcuttingmerit:)cutterhighrotationrateandthemachinetoolheightenterbegiventoandhighacceleration,improvemetalexcisionrategreatly)quickcuttingdiminutionscutaforce)quickcuttingheatmajorpartgenerateheatfromthecuttingsentrainment,workpiecebeingshort)quickcuttingcutdownvibration,improvetreatingmasshighspeedtreatingapplytothebeneficialresultthatthemouldprocesses)fleetnessroughprocessandhalffinishmachining,improvetreatingefficiency)highspeedhighaccuracyfinishmachiningreplaceonlyentiretheheightprocessing,indicatingmass,formaccuracyrise,,cutsdownrepairamillbyhandthanEDMprocessesapotentiation)cutsthesurfaceprocessingfinalmoldingstiffly,improvesurfacemass,formaccuracy,thetreating(notonlybeingthatsurfaceharshnessislow,andthesurfaceradianceishigh),beingusedforcomplicatedsurfacehasmoreadvantage)thesurfacelossthatEDMtreatingproduces,improvemouldlifespan)processesanelectroderapidlycombiningwiththeCADCAMtechnology,especially,theformiscomplicated,thinwallissimilartoanelectrodeadoptquickcuttingtoprocessamouldneedingtheproblemsolvingIninthehomeland,sincetheaspectcausesuchasfund,technology,thequickcuttingapplyingproduceamouldbeintheinitialstagestageReturnthemachinetool,cutter,handicraftbacktoexistenceaswellassomeproblemofaspectneedstoproceedorderlyothersolveTheshortcomingisthatfinishedcostishigh,correctcuttersigmatismhavecomparativelyhighdemand,cannothaveusedbigcutters,needtohavethecomplicatedcomputerprogrammingtechnologytobeusedforsupport,equipmentrunningcostheightTwo,thehighspeedprocessingamould'sprocessesamachinetoolMouldfinishmachiningandhardcuttingtreatingrequirethatthenumericalcontrolhighspeedmachinetool,formboard,modelputuptheprecisionprocessingneed,higheffectnumericalcontrolmachinetooletcThemouldaimingatproducesalotofmachinetoolenterprise,sometreatingcentresallaboveofthemachinetoolproducingafactorysellsenterprisetoamouldThefixedassetshavingbillionyuanwithoutexceptionintheupcomingseveralyearsthrowsintomouldindustry,isthemachinetoolbuyingamouldprocessequipment,justsayingeveryyearhavingbillionyuanofRMBtobuyJinqieamongthemAtpresentaverageourcountrynumericalcontrolmachinetoolutilizationratioapproximately,thehighspeedmachinetoolutilizationratio~Also,mouldenterprisehastheunitsuitabletobuyahighspeedmachinetool,complieswith~rmp'stohavehighspeedmachinetooltechnologyparameterdemandsProcesscentrechiefaxishighpower,highrotationrate,satisfiedrudefinishmachiningThefinishmachiningmouldwantstoneedtoreach~rmplikethecutter,themachinetoolwithminordiameterGenerally,thechiefaxisrotationratemachinetoolunderrpmcancarryoutroughprocessandhalffinishmachining,cannotreachthefinishmachiningaccuracyHavenowaytoreachtheabovemmincuttingspeedfivescrollsofmachinetoolsapplicationincreasesatrend)treatingrouteisnimble,thesurfaceformiscomplicated)treatingrangeisbig,thevarioustypemouldsuitableprocesses)cutslifespanofconditioneasytocutdowncutterwear,toraiseacutter,thesoftwaresbuyingCADCAMandhighspeedmachinetoolsassortOnthegroundsofthemachinetool,majorpartcounting,havingseveralbillionsUSdollartobeusedtoenterporteveryyear,theelectromachiningmachinetoolandthehighspeedmachinetoolneedtoimportThree,quickcuttingmouldcuttertechnologyQuickcuttingprocessesthecutterneedingallocatingproperquickcuttingProgressingprocessingcuttermaterial'sinhighspeedhasurgeddevelopmentofhighspeedtreatingThecutter,knifeedgeheadquarterandhightenacitybasegatheringcrystalstrengtheningtheceramicscutterbeingabletobeusedgivingconsiderationtohighhardnessexperienceandobservecarbidealloycoatingbecomingpossibilityGatherthecrystalcubenitridingboron(PCBN)bit,whosehardnessmayamountto~HVGathercrystalmiamond(PCD)it'shardnessbutamountto~HVGermanySCS,JapanMitsubishi(magicalsteel)andSumitomo,SwitzerlandShanteweike,USAKennaareinrecentyearsswiftlylargewaitforthefamousabroadcuttercompanytosuccessivelyhavedebutedtherespectivequickcuttingcutter,notonlycutterhavingaveragestructuralsteelofquickcutting,theceramicscutterstillhavingdirectquickcuttingofenergyquenchinghardsteeliswaitingforaneffecttosurpassthehardcutter,especiallythecoatingcutterappearsallofasudden,bringingintoplayinquenchinghalffinishmachiningandfinishmachiningofhardsteelNewcuttermaterialandcuttertechnologyappearingalreadymakethebottleneckproblemthathighspeedhasprocessednolongerbeabletoappearonthecutterBut,expensiveentrancecutterpricealsoblocksquickcuttingmouldkeyfactorAbovetocometosayingthecutterandthecutterholderaccelerationreachgsthesort,thecuttercircularrunoutneedstobesmallerthanmm,buttheknifelengthisunablegreaterthantimescuttersdiameterTherealityaccordingtoSANDVIKcompanyhascounted,thecarbidealloyhasstoodonintheentiretyusingcarbonnitridingtitanium(TICN)coatingwhenmillingcutters(HRC)carryouthighspeedbrightmetalchopping,roughprocesscutterlinearspeedhasbeenmminabout,whoselinearspeedhasexceededbutmminwhenfinishmachiningandmicrostoningSuchdemandstocuttermaterial(includethehardness,tenacity,redhardnesskeeptheform(includerowofcrumbsfunction,surfaceaccuracy,dynamicbalancesexetc(cuttingthefunction),thecutterunderhightemperaturestate))aswellascutterlifespanallhasveryhighlyExperienceaccordingtointhehomelandmouldhighspeedfinishmachining,linearspeedhasexceeded~mminwhenadopttheyoungdiameterballheadmillingcuttertocarryoutmouldfinishmachiningThemachinetoolchoosingsufficienthighspeed'scutsmouldfinishmachiningstifflyDelcamadoptmmdiametercuttertoprocessthenarrowslot,rotationraterpm,mmdepth,feedspeedmminchoosesthecutterparameter,thecutterwaitsifshoulderingananteriorangleThecutterrequiresthattheabilityprocessingrequestshockresistancetenacitymorehighly,requiringthatheatresistancepoundsthanaverageisstrongadoptsvariousmethodimprovingcutterlifespan,reducescuttercostadoptthehighspeedhilt,HSKhilt,heatpressingapplyingthemostbeingatpresenttopretendtogripacutterPayattentiontoacutterpretendtogripoverallinthedayafertomorrowdynamicbalancecurrentcutterenterprisehasalreadydonemanyjobsinthefieldofthetechnologyresolvingthequickcuttingcutter,servingfacingthecutterprocessingmayhelptosolvemuchproblem,thecutterhasproducedamanufacturerbecomingthemainbody,thereferencecutterhasproducedthetechnologyparameterthatthemanufacturerprovidesFour,improvequickcuttingmouldefficiencytechnologycutterdiameterandthelengthchoiceHSMandtheEDMchoicedoescuttingandthelubricatingcoolingfeedschoice:Moveforwardgenerallygivingamounts<millingcutterdiameters,moveforwardgivingawidth<millingcutterdiameterAccordingtomaterial,conditionchoosestheparameterprocessinghandicraftrationallyHighspeedbrightmetalcutsthemassprocessingpartmaterialabroadfairlygood,materialqualitylevelisidentical,thetreatingfunctioncomparisonisstableBut,thecutterthatthecompanyproducesabroadisalsothatthestandardmakesanexperimentwiththeirmaterialThetreatingbeingrecommendedbyissuitabletotheirstandardcomparativelyliketheparameter,materialqualityhasthecertaindifferencewithdomesticpart,thisdifferenceshowscomparativelyobviously,someparameterscanapplydirectly,butsomeeffectdispatchesrightawaycomparativelyduringtheperiodofhighspeedbrightmetalchopsifusingtheircutterButselectandusepartmaterialqualityinthehomelandlikeenterprisehavingthecertainstandard,whatbeputintousepartmaterial,canusethepartmaterialqualitythathighspeedprocessesespecially,thegeneralmeetingislimitedinsomepartmaterialrangeinner,thatthisappliesthehighspeedprocessingtechnologytoushasalsoprovidedadvantageouscondition,hasbeenabletoapplytolesstreatingmaterialwithinrangeBeingneedingtoemphasizethathere,mustchoosethetreatingtechnologicalparameteroptimizingoutasetofcapitalsuitableenterpriseonthesematerial,isbroughtintocompanystandardandThetechnologyselectingandusingthedomesticcutter,seldomhavingthebrightmetalrecommendinghighspeedtochopparametric,isnecessarymakinganexperiment,getthecomparativelysatisfiedparameter,produceamanufacturerhadbettertoselectandusethefixedcutter,cutdownthenumberoftimestestingthat,thestandardformingaprocessingtechnology,suchcanimproveeffectiveutilizationratioofequipment,lowersproductioncosts,cangetthefairlygoodeconomiceffectFive,quickcuttingrouteprocessingacutterandprogramming)flatsurfacefeedstheroutechoice))outlinesprocesstheroutechoice)Keepcuttingloadingstable)keepsrelativelystablemovingforwardgivingamountsandfeedspeed)keepsthegardencornerinflatsurfacecutting)choosesthefinishmachiningmarginrationallyProgrammingdemandofHSCfinishmachiningtoCAM:)thebrightmetalavoidingacornertothefullcutsmotion)triesone'sbesttoavoidexternalfeedofworkpieceandenternextdepthreturnknifemotion,directfromtheoutlineOradoptahelicallineorbeingsureenterslantingtomovingforward)constanteachedgefeed,improvethequality,prolongscutterlifespan)outlinetreatingarekeptwaitinginlevelsurfaceQuickcuttingCAMsoftware:Severalyearsagowillhavestartedquickcuttingprocessingprogrammingtechnologyresearch,theDelcamcompany,hasdevelopedthequickcuttingautomationprogrammingsoftwaremoduleLately,theMasterCAMcompanyhasalsodevelopedthequickcuttingautomationprogrammingsoftwaremoduleYoualsoareininthehomelandnorthnavigationdevelopingthequickcuttingautomationprogrammingsoftwaremoduleSix,highspeedmachinetoolnumericalcontrolsystemcharacteristic)highspeeddataisprocessed)cornerforecastsarehandled)NURBSarenotjustifiedappearancestriprunincurvetreatingSeven,safequickcuttingmouldproblem)Monitoringwearingacutterawayanddestroying)Intensitythatthebitlinks)Strictwiththemachinetoolandthecutterexaminationisveryimportantandbeforetheaveragemachinetoolprocessingdiversity,safetyprotectsandstartsupEight,thereexistsprobleminourcountryatpresentinadopthighspeedtoprocessthemouldtechnologymachinetool:)domestichighspeedmachinetooloverallfunctionstillhasthegap,thefunctioncomponentfunctiontobeabletonotsatisfyarequestPowerandrotationrateincludingtheelectricitychiefaxis,entrancemachinetoolpriceishigh)Underthemachinetoolhighspeed,thedynamicbehaviourstudiesthefunctionbeingnotenoughtoaffectacompletemachineasaresult,)Thefivescrollofmachinetoolisnotenoughmature,entrancemachinetoolpriceisveryhigh)supportingtechnologyandequipmentarefairlyincompletecutters:)domesticcutterisnotabletoadapttothequickcuttingapplication,highspeedcutsonlyentiretreatingespeciallystifflyEntrancecutterpriceishighThecuttertechnologyistoaffectquickcuttingprocessingakeyfactorofmould)supportingtechnologiesarenotenoughtoincludehilt,onlinedynamicbalanceincompletesetetchighspeedmouldsprocessthetechnologyandtheexperiment)Beshortoftheaccumulationapplyingexperiencesincehighspeedprocessesthemouldhistorycomparativelyshortly,)Thecomparisonstudyingcomparisonstopsthrowingintolack,setsupaprojecttoquickcuttinghandicraftisdifficult)Beshortofthequickcuttingdatabaseorthehandbook,isstillblankspaceatpresent)mouldsproducethemanufacturercognitionlacktoquickcutting,theanalysiscontrastbeingshortoflongrangebeneficialresultBeshortofthequickcuttingautomationprogrammingsoftwareBeshortofafivescrollofgearquickcuttingautomationprogrammingCAMsoftwareConcludingremarkThemouldmarketplacehastheintenseneed,buttechnologytobeunabletokeepabreastwithtohighspeedtreatingStartingislate,thebasisisrelativelypoor,overallengineeringlevelnotbeingtallerthan,developsslowlyRequirethatonebyone,aspectcoordinatedgrowth,theproductmimicinkstonethrowingintocombiningwithenlarging,eachcomprehensiveutilizationaspectstrengthsdrivequickcuttingapplicationinmakinginthemouldOurhope,effortpassingeveryaspect,beforethemarketdemandpushgodown,passtechnologicalprogress,looklikeautomobile,machinetool,homeappliance,beforelong,notonlyourcountrybeinggoingtobecomeamouldproducingGreatPower,andbegoingtobecomeamouldproducingthepowerfulcountryReferences,JinDiecheng,SongFangzhiThemodernmouldmakesthetechnology,Beijing:Mechanicalindustrypress,,XuHefeng,Thedigitizationmouldmakesthetechnology,Beijing:Chemicalindustrypress,,ZhaoBo,HighspeedprocessestheforwardpositiontechnologythatthemouldprocessesMouldtechnology,,(),ZhangHaiou,ThefleetnessmouldmakesthetechnologycurrentsituationandtheirdevelopingtrendMouldtechnology,,(),GuoDongming,WangXiaoming,BegearedtotheneedsoftheparticularkindprocessingtechnologythatthefleetnesscreatesChinesemechanicalengineering,,()高速加工和现代模具制造一、概述(目前模具制造的发展现状和趋势模具作为重要的工艺装备在消费品、电器电子、汽车、飞机制造等工业部门中占有举足轻重的地位。模具作为重要的工艺装备在消费品、电器电子、汽车、飞机制造等工业部门中占有举足轻重的地位。工业产品零件粗加工的精加工的及塑料零件的将由模具完成。目前中国模具市场需求已达亿元之规模。汽车模具、特别是覆盖件模具年增长速度将超过建材模具也迅速发展各种异型材模具、墙面和地面模具成为模具的新增长点今后几年塑料门窗和塑料排水管增长将超过家电模具年增长速度将超过IT业年均增长速度超过对模具的需求占模具市场的。年中国机床工具工业产值将继续增长。我国模具制造市场潜力巨大。根据资料统计近年来我国模具的年总产值达到亿美元进口超过亿美元出口超过亿美元。增长从年的增加到年的。国外专家预言:亚洲在全球模具制造中占据的份额将从年的增加至年的。中国模具工业发展迅速形成了华东和华南两大基地并且逐渐扩大到其他省份。(山东,安徽,四川)年,年模具制造业产值年平均增长年增长。年我国模具产值为亿人民币。总产量位居世界第出口模具亿美元比上年增长。但是我国技术含量低的模具已供过于求精密、复杂的高档模具很大部分依靠进口。每年进口模具超过亿美元。出口超过亿美元。精密模具精度要求在,μm,大型模具需要满足kN合模力注塑机的要求小型模具需满足直径mm塑料管的要求。目前采用高速切削生产模具已经成为模具制造的大趋势在国外一些模具生产厂家高速机床大面积取代电火花机床高速切削大大提高了模具生产效率。机床企业瞄准模具生产企业有的加工中心生产厂机床的以上卖给模具加工企业。高速切削逐渐取代电火花精加工模具在国外的模具制造企业已经普遍采用高速切削生产模具已经成为逐渐模具制造的大趋势大大提高了模具生产效率和质量。采用高速切削替代电火花生产模具可以明显提高效率、提高模具精度、使用寿命长。(高速加工在模具制造中的应用(高速切削的优点:)刀具的高转速和机床的高进给以及高加速度大大提高金属切除率)高速切削减小切削力)高速切削热大部分由切屑带走工件发热少)高速切削减少振动提高加工质量(高速加工应用于模具加工的效益)快速粗加工和半精加工提高加工效率)高速高精度精加工硬切削代替光整加工表明质量高形状精度提高比EDM加工提高效率减少手工修磨)硬切削加工最后成型表面提高表面质量、形状精度(不仅是表面粗糙度低而且表面光亮度高)用于复杂表面的加工更具优势)避免EDM加工产生的表面损伤提高模具寿命)结合CADCAM技术快速加工电极特别是形状复杂、薄壁类电极。(采用高速切削加工模具需要解决的问题在国内由于资金、技术等方面的原因应用高速切削生产模具还处于初期阶段。还存在机床、刀具、工艺以及其他方面的一些问题需要逐步解决。缺点是加工成本高对刀具的使用有较高的要求不能使用过大的刀具要有复杂的计算机编程技术做支持设备运行成本高。二、加工模具的高速加工机床模具精加工和硬切削加工需要数控高速机床,模板、模架加工需要精密、高效数控机床等。许多机床企业瞄准模具生产有的加工中心生产厂机床的以上卖给模具企业。模具行业今后几年年均有亿元的固定资产投入其中是购买模具加工设备也就是说每年有亿元人民币要购买金切机床。目前我国数控机床的平均利用率大约高速机床的利用率,。模具企业也有相当的单位购买高速机床从,rmp的都有。(高速机床的技术参数要求加工中心主轴大功率、高转速满足粗精加工精加工模具要用小直径刀具机床一般要达到,rmp。通常主轴转速在rpm以下的机床可以进行粗加工和半精加工达不到精加工的精度无法达到mmin以上的切削速度。(五轴机床的应用增加趋势)加工路线灵活表面形状复杂)加工范围大适合多种类型模具加工)切削条件好减少刀具磨损提高刀具寿命(购买CADCAM软件和高速机床配套据统计每年有几十亿美元用于进口机床大部分电加工机床和高速机床需要进口。三、高速切削模具的刀具技术高速切削加工还需配备适宜高速切削的刀具。高速加工刀具材料的进展促使了高速加工的发展。硬质合金涂层刀具、聚晶增强陶瓷刀具使得兼顾高硬度的刀刃部和高韧性的基体成为可能。聚晶立方氮化硼(PCBN)刀片,其硬度可达,HV。聚晶金刚石(PCD)其硬度可达,HV。近年来德国SCS、日本三菱(神钢)及住友、瑞士山特维克、美国肯纳飞硕等国外著名刀具公司都先后推出了各自的高速切削刀具不仅有高速切削普通结构钢的刀具,还有能直接高速切削淬硬钢的陶瓷刀具等超硬刀具,尤其是涂层刀具异军突起,在淬硬钢的半精加工和精加工中发挥着巨大作用。新刀具材料和刀具技术的出现已经使高速加工上的瓶颈问题不再会出现在刀具上。但是进口刀具的昂贵价格也阻碍高速切削模具的重要因素。一般来说,刀具以及刀夹的加速度达到g以上刀具的径向跳动要小于mm而刀的长度不能大于倍的刀具直径。根据SANDVIK公司的实际统计在使用碳氮化钛(TICN)涂层的整体硬质合金立铣刀(HRC)进行高速铣削时,粗加工刀具线速度约为mmin,而精加工和超精加工时,其线速度超过了mmin。这样对刀具的材料(包括硬度、韧性、红硬性(高温状态下保持切削性能))、刀具的形状(包括排屑性能、表面精度、动平衡性等)以及刀具寿命都有很高的要求。根据国内模具高速精加工的经验采用小直径球头铣刀进行模具精加工时线速度超过了,mmin。选择足够高速度的机床硬切削模具精加工。Delcam采用mm直径的刀具加工窄槽转速rpmmm深度进给速度mmin。(选择刀具参数如负前角刀具等。刀具要求比普通加工要求抗冲击韧性更高还要求抗热冲击能力强(采取多种方法提高刀具寿命降低刀具成本。(采用高速刀柄目前应用最多的是HSK刀柄热压装夹刀具。注意刀具装夹后的整体动平衡(当前的刀具企业在解决高速切削刀具技术方面已经做了很多工作面向加工的刀具服务会帮助解决很多问题刀具生产厂家成为主体参考刀具生产厂家提供的技术参数。四、提高高速切削模具效率的工艺技术(刀具直径和长度的选择(HSM和EDM的选择(干切削和润滑冷却(进给选择:通常进给量<铣刀直径进给宽度<铣刀直径。根据材料情况合理选择加工工艺参数国外高速铣削加工零件材料质量较好材料质量标准相同,加工性能比较稳定而国外公司生产的刀具也是以他们的材料标准做试验推荐的加工参数一般比较适合他们的标准如果使用他们的刀具与国内的零件材质有一定的区别,在高速铣削时,这种差别表现得较为明显有些参数可以直接应用但有些效果就比较差。而国内企业一般选用零件材质有一定的标准,所使用的零件材料特别是能用高速加工的零件材质一般会局限在某些零件材料范围内,这对我们应用高速加工技术也提供了有利的条件会在较少的加工材料范围内应用。这里要强调的是一定要在这些材料上选取优化出一套适合本企业的加工工艺参数并且纳入企业标准。选用国产刀具,很少有推荐高速铣削的技术参数的,有必要做试验,取得比较满意的参数,最好选用固定的刀具生产厂家,减少试验的次数,形成加工技术标准,这样可以提高设备有效利用率,降低生产成本,可以取得较好的经济效益。五、高速切削的加工刀具路径和编程)平面进给路径选择)轮廓加工路径选择)保持切削载荷平稳)保持相对平稳的进给量和进给速度)在平面切削中保持园拐角)合理选择精加工余量HSC精加工对CAM的编程要求:)尽量避免拐角的铣削运动)尽量避免工件外的进刀与退刀运动直接从轮廓进入下一个深度。或者采用螺旋线或斜向进给切入)恒定每刃进给提高质量延长刀具寿命)轮廓加工保持在水平面上等。高速切削CAM软件:Delcam公司几年前就开始了高速切削加工编程技术的研究开发了高速切削自动编程软件模块最近MasterCAM公司也开发了高速切削自动编程软件模块国内北航海尔也在开发高速切削自动编程软件模块六、高速机床数控系统的特点)高速数据处理)拐角预测处理)NURBS非有理样条插补曲线加工七、高速切削模具的安全问题)刀具磨损和破坏的监测)刀片连接的强度)和普通机床加工不同安全防护和开机前对机床和刀具的严格检查非常重要。八、目前我国在采用高速加工模具技术中存在的问题(机床:)国产高速机床整体性能尚有差距功能部件性能还不能满足要求。包括电主轴的功率和转速进口机床价格高)机床的高速下动态特性研究还不够因而影响整机的性能)五轴机床还不够成熟进口机床价格太高)配套技术和设备还不完全。(刀具:)国产刀具还不能够适应高速切削的应用特别是高速硬切削光整加工。进口刀具价格高。刀具技术是影响高速切削加工模具的一个重要因素。)配套技术还不够包括刀柄、成套在线动平衡等。(高速模具加工工艺技术及实验)由于高速加工模具的历史比较短缺乏应用经验积累)对高速切削工艺研究比较少投入不够立项比较困难)缺少高速切削数据库或手册目前还是空白)模具生产厂家对高速切削的认识不够缺乏长期效益的分析对比(缺乏高速切削自动编程软件(缺乏五轴联动高速切削自动编程CAM软件。结束语模具市场对高速加工有强烈需求但是技术跟不上。起步晚基础较差整体技术水平不高发展缓慢。需要各个方面协调发展产学研结合加大投入综合利用各个方面力量推动高速切削在模具制造中的应用。我们希望通过各方面的努力在市场需求的推动下通过技术进步像汽车、机床、家电一样在不远的将来我国不但要成为模具生产大国而且要成为模具生产强国。参考文献、金涤尘宋放之现代模具制造技术北京:机械工业出版社、许鹤峰数字化模具制造技术北京:化学工业出版社、赵波模具加工的前沿技术高速加工模具技术()、张海鸥快速模具制造技术的现状及其发展趋势模具技术()、郭东明王晓明面向快速制造的特种加工技术中国机械工程()本人工作于模具企业从事模具设计工作现兼职代做、辅导模具毕业设计~帮助同学们安心工作顺利毕业~~~联系QQ邮箱YOUHENGJINCO

用户评价(0)

关闭

新课改视野下建构高中语文教学实验成果报告(32KB)

抱歉,积分不足下载失败,请稍后再试!

提示

试读已结束,如需要继续阅读或者下载,敬请购买!

文档小程序码

使用微信“扫一扫”扫码寻找文档

1

打开微信

2

扫描小程序码

3

发布寻找信息

4

等待寻找结果

我知道了
评分:

/56

手机外壳注射成形塑料模具设计毕业论文

VIP

在线
客服

免费
邮箱

爱问共享资料服务号

扫描关注领取更多福利