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1、射出成型製程簡(jiǎn)介精成科技模具中心射出成型製程簡(jiǎn)介射出成型機(jī)及操作塑膠成型製程物理射出成型機(jī)及操作精成科技模具中心射出成型機(jī)系統(tǒng)鎖模系統(tǒng)模具系統(tǒng)充填系統(tǒng)液壓系統(tǒng)控制系統(tǒng)射出成型機(jī)規(guī)格一般而言,射出成型機(jī)規(guī)格指定以鎖模噸數(shù)(Clampingtonnage)及射料量(shotsize)兩者為主。其他的參數(shù),還包括了射出速率(injectionrate),射出壓力(injectionpressure),螺桿規(guī)格(screwdesign),最大模厚(moldthickness),以及柱間距(thedistancebetweentiebars)。射出成型機(jī)種類一般
2、用途General-purposemachines精密,高精度Precision,tight-tolerancemachines高速,薄殼成型High-speed,thin-wallmachines充填系統(tǒng)InjectionSystem料斗加熱器噴嘴往復(fù)式螺桿料管料斗TheHopperThermoplasticmaterialissuppliedtomoldersintheformofsmallpellets.Thehopperontheinjectionmoldingmachineholdsthesepellets.Thepelletsareg
3、ravity-fedfromthehopperthroughthehopperthroatintothebarrelandscrewassembly.成型業(yè)者拿到的熱塑性材料是小圓球狀或是不規(guī)則的塊狀,材料會(huì)放置到射出機(jī)上的料斗,利用重力讓這些材料從料斗進(jìn)入到料管及螺桿系統(tǒng)料管TheBarrel射出成型機(jī)的料管內(nèi)安裝往復(fù)式塑化螺桿。料管由電子加熱器加熱。thebarreloftheinjectionmoldingmachinesupportsthereciprocatingplasticizingscrew.Itisheatedbytheelectri
4、cheaterbands.往復(fù)式螺桿TheReciprocatingScrew往復(fù)式螺桿的功能包括了壓縮,融化,以及傳遞塑料。往復(fù)式螺桿的動(dòng)作可分為三段:加料段TheFeedingZone壓縮段TheCompressing(Transition)Zone計(jì)量段TheMeteringZone往復(fù)式螺桿結(jié)構(gòu)加料段壓縮段計(jì)量段螺桿料管往復(fù)式螺桿動(dòng)作過程螺桿的外徑固定,但從壓縮段開始,螺桿的螺牙深度逐漸變淺,塑料與螺桿摩擦的黏滯力產(chǎn)生剪切熱(ViscousShearHeat)。剪切熱是讓塑膠粒融化的主要熱量來源,加熱器的功用僅在讓料管維持在塑料的融熔溫度。液壓
5、系統(tǒng)HydraulicSystemThehydraulicsystemontheinjectionmoldingmachineprovidesthepowertoopenandclosethemold,buildandholdtheclampingtonnage,turnthereciprocatingscrew,drivethereciprocatingscrew,andenergizeejectorpinsandmovingmoldcores.Anumberofhydrauliccomponentsarerequiredtoprovidethisp
6、ower,whichincludepumps,valves,hydraulicmotors,hydraulicfittings,hydraulictubing,andhydraulicreservoirs.射出成型機(jī)的液壓系統(tǒng)提供了開閉模,鎖模系統(tǒng),螺桿轉(zhuǎn)動(dòng),模具頂出等系統(tǒng)的動(dòng)力來源。液壓系統(tǒng)包括了幫浦,油閥,液壓馬達(dá),液壓配合件,液壓渦輪,以及油槽等。.射出成型機(jī)操作順序一模具關(guān)閉,螺桿後退,準(zhǔn)備充填螺桿前進(jìn),直到模穴填滿射出成型機(jī)操作順序二螺桿持續(xù)前進(jìn),維持模穴保壓模穴持續(xù)冷卻至澆口凝固,螺桿後退射出成型機(jī)操作順序三模具打開,將成品頂出模具關(guān)閉,等
7、待下次成型射出成型動(dòng)作細(xì)分充填Filling保壓Packing開模MoldOpening頂出PartEjection閉模MoldClosing塑膠成型製程物理精成科技模具中心塑膠如何流動(dòng)?Moltenthermoplasticexhibitsviscoelasticbehavior,whichcombinesflowcharacteristicsofbothviscousliquidsandelasticsolids.Whenaviscousliquidflows,theenergythatcausesthedeformationisdissipate
8、dandbecomesviscousheat.Ontheotherhand,whenanela