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1、LCP產(chǎn)品的低翹曲技術(shù)LowwarpagetechniqueforLCPparts寶理工程塑料技術(shù)中心PolyplasticsCo.LtdTechnicalSolutionCenterLCP連接器翹曲何以發(fā)生？WhywarpageofLCPconnectorishappened?q收縮的各向異性AnisotropyShrinkageq內(nèi)應(yīng)力Moldingstressq其他…etcInitialvolumeduringthemoldingIfeachpartcanshrinkseparatelyInactuality,,,LCP產(chǎn)品低翹曲Low-wa
2、rpageforLCPpartsq設(shè)計Designa控制填充模式Controlorientationwithflowpatterna中性軸力矩平衡Momentbalanceatneutralaxisa調(diào)整產(chǎn)品壁厚、澆口位置、減膠Harmonizewallthickness,gateposition,coreoutq注塑條件Moldingconditiona均一填充Homogeneousfillingpatterna高射速低射壓Lowmoldingpressurewithhighinjectionspeeda高模溫減小回流焊前后的翹曲差HighMol
3、dtemperaturetoreducedeformationchangebeforeandafterIRreflowq低翹曲規(guī)格Low-warpagegradea各向異性小Lowanisotropya高流動性Highflow填充模式和取向FlowPattern&Orientation填充模式澆口收縮率大ＸＸＹＹX方向凹向變形收縮率?。喝∠蚍较蛟O(shè)計Design盒形產(chǎn)品的壁厚平衡Balanceinwallthicknessforboxmodel0.20.111ｍｍ）0.10.035流動不平衡（0.0ageImbalanceFlow-0.1-0.062
4、Warp-0.2Design1Design2Design3取向不同0.50.30.5DifferenceinOrientation0.50.50.3收縮的各向異性Ｔ１＞Ｔ２（Design２）Ｔ１＜Ｔ２（Design３）AnisotropicShrinkageSideviewSideviewgategate翹曲BottomviewBottomviewgateWarpagegate＊WeldinglineincenterShrinkage:Side＞BottomShrinkage:Side＜Bottom連接器模型設(shè)計Designforconnector
5、modelWarp↑中性軸ＭA中性軸ＭA＝ＭBWarp↓ＭB基礎(chǔ)設(shè)計中性軸ＭAＭA＞ＭBＭB在截面的中性軸保持力矩對稱平衡Keepmomentbalanceatneutralaxisofcrosssection流動形式?取向／收縮平衡Flowpattern?Orientation／Shrinkagebalance57.2mm0.6mm0.3mm2.0mm0.3mm0.3mmShape1Shape5設(shè)計和翹曲間距0.6mm連接器模型Warpagedependingondesign0.6mmpitchconnectormodel0.7Vectra?E1
6、30i0.5890.60.50.411（ｍｍ）0.40.2840.30.2180.2Warpage0.1150.10.0320.0230.0580.0形狀１形狀２形狀３形狀４形狀５形狀６形狀７形狀８１２３４５６７８Crosssection注塑條件：注射速度Moldingcondition：injectionspeedDesign5Design8InjectionSpeedFillingpressurevsFillingtime0.12）300V=50mm/sec）0.10250V=80mm/sec0.082000.06V=400mm/sec1500
7、.04100Warpage(mm0.02Peakpressure(MPa500.00000.10.20.300.10.2Fillingtime(sec)Fillingtime(sec)熔體粘度和剪切速度的關(guān)系MeltviscositydependencyonshearrateA950MeltViscosityat300℃1.E+04SteadyStress低剪切時高粘度，故無飛邊HighMVatlowshear，NoFlash1.E+03(Pa.s)]*PBT,PAη,η[1.E+02MVLCPDynamicFrequencySweep高剪切時低粘
8、度，注塑時高流動LowMVathighshear，Highflowatinjection1.E+011.E-041.E-0
