气辅注射成型技术课件.ppt

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1、氣輔注塑成型技術Gas-assistedInjectionMouldingTechnology短射工藝ShortShotProcess二次氣體穿透SecondaryGasPenetration熔膠注射PolymerInjection主要氣體穿透PrimaryGasPenetration型腔部份短射PartialShotinCavity氣體注射GasInjection氣體注射GasInjection氣體：大多採用氮氣Gas:UseNitrogen,Mostly氣體穿透熔膠的斷面圖Cross-sectionofgaspenetrationthroughmoltenplastic

2、熔膠PolymerMelt氣體Gas塑膠凝結層FrozenLayerofPolymer模壁MouldWall模壁MouldWall氣輔注射成型Gas-assistedInjectionMoulding滿射工藝FullShotProcess熔膠注射PolymerInjection初始氣體穿透InitialGasPenetration型腔滿射“Full”ShotinCavity氣體注射GasInjection氣體注射GasInjection最終氣體穿透FinalGasPenetration氣體：大多採用氮氣Gas:UseNitrogen,Mostly傳統和氣輔注射成型的壓力分布

3、傳統注射成型ConventionalInjectionMoulding氣輔注射成型Gas-assistedInjectionMoulding氣輔注射成型的優點MeritsofGas-assistedMoulding低射壓、低鎖模力Lowinjectionpressure,lowclampforce壓力分布均勻、收縮均勻、殘餘應力低、不易翹曲、尺寸穩定Evenpressuredistribution,evenshrinkage,lowerresidualstress,lesswarpage,morestabledimensions消除縮痕、模面再現性高Eliminationo

4、fsinkmarks,betterplasticmouldsurfacereplication省塑料，可用強度和價格較低的塑料Plasticmaterialsaving,replacementofstronger&moreexpensiveplasticmaterial5.可用強度和價格較低的模具金屬(如鋁)Useoflessstrongandlessexpensivemouldmetal(e.g.aluminum)6.厚薄件一體成型，減少模具和裝配線數目Integrationofthickandthinparts,lessmouldsandassemblylinesnee

5、ded7.可用較厚的肋、角板等補強件，提高製件剛性，使得製件公稱厚度得以打薄Useofthickerstiffeners(e.g.ribs,gussets,etc.)whichincreasespartstiffnessandmakesthinnernominalthicknesspossible8.增加設計自由度Moredesignflexibility氣體進口位置GasEntranceLocations經流道ThroughtheRunner直接進製品DirectlyinthePart經噴嘴ThroughtheNozzle典型問題TypicalProblems跑道現象Ra

6、cetrackingeffect氣體穿透不佳Poorgaspenetration氣體手指現象Gasfingering氣體吹穿Gasblowout製品表觀Partsurfaceappearance跑道現象RaceTrackingEffect氣體穿透不佳PoorGasPenetration氣體手指現象GasFingering氣體吹穿GasBlowOut短射法氣輔注射成型設計指南ShortShotGas-AssistedInjectionMouldingDesignGuide選定一非外觀面作為最後充填區Selectonenon-appearancesurfaceasthelast

7、filledarea.距離非外觀面最遠處定氣口位置。Locategasentrancewhereisthefarthestfromanon-appearancesurface.從氣口(上游)到上述非外觀面(下游)順流而下，勻稱的配置氣道以涵蓋整個製品面。From(upstream)gasentrancetoabove-mentioned(downstream)non-appearancesurface,layoutgaschannelstocoverthewholepartsurfaceevenly.短射法氣輔注射