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1、撓曲剛性FlexuralRigidity1M=rEIWhere1/r:樑的曲率curvatureofthebeamM:彎曲力矩bendingmomentE:彈性模數(shù)modulusofelasticityI:斷面積對中立軸的慣性矩momentofinertiaofthecross-sectionalareawithrespecttotheneutralaxisEI:撓曲剛性flexuralrigidity各種一體成型的內(nèi)鎖件能增加薄殼的剛性。Avarietyofmolded-ininterlockscanadds
2、tiffnesstothin-wallhousingdesigns.整合性收縮翹曲分析IntegratedShrinkageandWarpageAnalysis總收縮變形ProcessInducedShrinkageandWarpage(TotalShrinkageandWarpage)不均勻收縮non-uniformshrinkage不均衡冷卻unbalancedcooling不均勻收縮Non-UniformShrinkage檢查充填系統(tǒng)CheckFillingSystem模穴厚度和形狀、澆口數(shù)目和位置、流道
3、尺寸和配置以及融膠溫度、射壓和充填時(shí)間Cavitythickness&shape,gatenumber&location,runnersize&layoutandmelttemperature,pressure&filltime流長/壁厚比是否降低？Shallflowlength/thicknessratiosmaller?流動(dòng)是否更平衡？Canflowbemorebalanced?壓力分佈(原始設(shè)計(jì))Pressure(Original)·Maxentrancepressure:50.6MPa·Clampfor
4、ce:165.6ton翹曲變形結(jié)果(原始設(shè)計(jì))Shrinkage&Warpage(Original)壓力分佈(修正設(shè)計(jì))Pressure(Revised)·Maxentrancepressure:43.8MPa·Clampforce:111.6ton分析效益結(jié)論BenefitsSummary·找出變形的主要因素:不平衡冷卻或不均勻收縮è不均勻收縮·Findoutthemajorcauseofwarpage:unbalancedcoolingornon-uniformshrinkageènon-uniformsh
5、rinkage·增加澆口、縮短流長,以減少不均勻收縮è變形減少(5.1mm->1.4mm)·Addmoregatesandreduceflowlengthinordertoreduceshrinkagedifferenceèreducewarpage(5.1mm->1.4mm)不均衡冷卻UnbalancedCooling檢查冷卻系統(tǒng)CheckCoolingSystem冷卻孔道的尺寸、配置和串聯(lián)以及冷卻迴路的溫度和流率Size,layout&circuitingofchannelsandtemperature&f
6、lowrateofcoolant冷卻孔道是否均衡的配置在模穴的周圍?Arecoolingchannelserenlylaidoutaroundcavities?是否可以採用任何冷卻單元/裝置以消除熱點(diǎn)?Cananycoolingelements/devicesbeusedtoeliminatehotspots?冷卻液流動(dòng)是否平衡?Shallthecoolantflowmorebalanced?錄影帶盒VideoTapeCassetteCase原始設(shè)計(jì)的收縮翹曲結(jié)果Shrinkage&WarpageResults
7、ofOriginalDesign?不均勻收縮?總?non-uniformshrinkage?process-induced原始設(shè)計(jì)的收縮翹曲結(jié)果Shrinkage&WarpageResultsofOriginalDesign?不均衡冷卻?總?unbalancedcooling?process-induced冷卻水道設(shè)計(jì)-公模部份CoolingChannelDesign-CoreSide?原始設(shè)計(jì)?修正設(shè)計(jì)?Original?Revised冷卻水道設(shè)計(jì)-母模部份CoolingChannelDesign-Cavit
8、ySide?原始設(shè)計(jì)?修正設(shè)計(jì)?Original?Revised錄影帶盒的收縮翹曲Shringkag&Warpage,VideoTapeCassetteCase?原始設(shè)計(jì)?修正設(shè)計(jì)?Original?Revised筆記型電腦Docking後蓋歐磊科技股份有限公司OLETechnologyCorporation前言在射出成形的過程中，由於塑料密度的改變，造成體積收縮。產(chǎn)品各處體積收縮的差
