LCP产品的低翘曲技术

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1、LCP产品的低翘曲技术LowwarpagetechniqueforLCPparts宝理工程塑料技术中心PolyplasticsCo.LtdTechnicalSolutionCenterLCP连接器翘曲何以发生？WhywarpageofLCPconnectorishappened?q收缩的各向异性AnisotropyShrinkageq内应力Moldingstressq其他…etcInitialvolumeduringthemoldingIfeachpartcanshrinkseparatelyInactuality,,,LCP产品低翘曲Low-wa

2、rpageforLCPpartsq设计Designâ控制填充模式Controlorientationwithflowpatternâ中性轴力矩平衡Momentbalanceatneutralaxisâ调整产品壁厚、浇口位置、减胶Harmonizewallthickness,gateposition,coreoutq注塑条件Moldingconditionâ均一填充Homogeneousfillingpatternâ高射速低射压Lowmoldingpressurewithhighinjectionspeedâ高模温减小回流焊前后的翘曲差HighMol

3、dtemperaturetoreducedeformationchangebeforeandafterIRreflowq低翘曲规格Low-warpagegradeâ各向异性小Lowanisotropyâ高流动性Highflow填充模式和取向FlowPattern&Orientation填充模式浇口收缩率大ＸＸＹＹX方向凹向变形收缩率小：取向方向设计Design盒形产品的壁厚平衡Balanceinwallthicknessforboxmodel0.20.111ｍｍ）0.10.035流动不平衡（0.0ageImbalanceFlow-0.1-0.062

4、Warp-0.2Design1Design2Design3取向不同0.50.30.5DifferenceinOrientation0.50.50.3收缩的各向异性Ｔ１＞Ｔ２（Design２）Ｔ１＜Ｔ２（Design３）AnisotropicShrinkageSideviewSideviewgategate翘曲BottomviewBottomviewgateWarpagegate＊WeldinglineincenterShrinkage:Side＞BottomShrinkage:Side＜Bottom连接器模型设计Designforconnector

5、modelWarp↑中性轴ＭA中性轴ＭA＝ＭBWarp↓ＭB基础设计中性轴ＭAＭA＞ＭBＭB在截面的中性轴保持力矩对称平衡Keepmomentbalanceatneutralaxisofcrosssection流动形式⇒取向／收缩平衡Flowpattern⇒Orientation／Shrinkagebalance57.2mm0.6mm0.3mm2.0mm0.3mm0.3mmShape1Shape5设计和翘曲间距0.6mm连接器模型Warpagedependingondesign0.6mmpitchconnectormodel0.7Vectra®E1

6、30i0.5890.60.50.411（ｍｍ）0.40.2840.30.2180.2Warpage0.1150.10.0320.0230.0580.0形状１形状２形状３形状４形状５形状６形状７形状８１２３４５６７８Crosssection注塑条件：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)熔体粘度和剪切速度的关系MeltviscositydependencyonshearrateA950MeltViscosityat300℃1.E+04SteadyStress低剪切时高粘度，故无飞边HighMVatlowshear，NoFlash1.E+03(Pa.s)]*PBT,PAη,η[1.E+02MVLCPDynamicFrequencySweep高剪切时低粘

8、度，注塑时高流动LowMVathighshear，Highflowatinjection1.E+011.E-041.E-0