浇注系统设计讲义ppt课件.ppt

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1、塑胶产品与模具设计PlasticPartandMoldDesign徐昌煜CharlesHsu欧磊科技股份有限公司OLETechnologyCorp.浇注系统设计FillingSystemDesign徐昌煜CharlesHsu模具设计的优先顺序PrioritiesofMoldDesign浇注系统设计(FillingSystemDesign)排气系统设计(VentingSystemDesign)冷却系统设计(CoolingSystemDesign)脱模系统设计(EjectingSystemDesign)浇注系统设计的优先顺序PrioritiesofFillingS

2、ystemDesign产品设计(PartDesign)型腔设计(CavityDesign)浇口设计(GateDesign)流道设计(RunnerDesign)竖浇道设计(SprueDesign)喷嘴设计(NozzleDesign)竖浇道Sprue主流道MainRunner成品Part浇口Gate冷料井ColdSlugWell支流道BranchRunner典型的浇注系统TypicalFillingSystem壁厚不均是注塑成形中最大的麻烦制造者。这对薄壁零件尤然。这些麻烦包括了迟滞现象、短射、凹陷、发赤、喷流、翘曲及长冷却时间等；目前都可用CAE以直接或间接的方

3、式预测。Non-uniformwallthicknessisthebiggesttroublemakerinplasticinjectionmolding.Thisisespeciallytruetothin-wallpart.Thetroubles,includinghesitation,shortshot,sinkmark,blush,jetting,warpageandlongcoolingtimeetc.,canbepredicted,directlyorindirectly,byusingCAE.壁厚不均Non-uniformWallThicknes

4、s壁厚设计WallThicknessDesign差[Poor]较好[Better]最好[Best]掏空设计(1)CoringOutDesign(1)改进设计[Improved]原设计[Original]差[Poor]改进[Improved]掏空设计(2)CoringOutDesign(2)气泡或/和凹陷的形成Voidor/andSinkMarkForming气泡(Void)凹陷(SinkMark)肋厚和内圆角半径的影响TheEffectofRibThickness&FilletRadius肋的底部厚度BottomThicknessofRibW0.5W2.5WW

5、1.2WD1.5WD(A)(B)肋的设计(一)RibDesign(1)t=wallthichnessB=0.5tC=3tAAD=2BE=0.13mm(radius)F=1.5-2deg假如需要更大的强度,可增加肋的数目Ifmorestrengthisrequired,addadditionalribs.FBDECt肋的设计(二)RibDesign(2)肋的设计(三)RibDesign(3)与侧壁相连之凸毂(热塑性塑胶)BossatWall(Thermoplastics)A=凸毂附着处壁厚wallthicknessB=凸毂外环直径dia.ofbossoverra

6、diiC=0.5AD=2BE=1~2degF=0.13mm(radius)G=DH=0.8AI=A/4J=2BK=0.3~1JL=0.5ALHA'A'KEIGJDAFCBSectionA'-A'远离侧壁之凸毂(热塑性塑胶)BossAwayFromWall(Thermoplastics)A=凸毂附着处壁厚wallthicknessB=凸毂外环直径(含底部修整圆弧半径)dia.ofbossoverradiiC=0.5AD=2BE=1-2degF=0.13mm(radius)G=0.95DH=0.3Gmin.toGmax.I=0.5AHEFDFGCBAI外侧凸毂Ou

7、tsideBossA'A'A(DIA)BB=AB=2A(max.)SectionA'-A'Where1/r:梁的曲率curvatureofthebeamM:弯曲力矩bendingmomentE:弹性模数modulusofelasticityI:断面积对中立轴的惯性矩momentofinertiaofthecross-sectionalareawithrespecttotheneutralaxisEI:挠曲刚性flexuralrigidity挠曲刚性FlexuralRigidityNeutralAxis?10.8平板和肋板的比较Comparisonbetween

8、Plain&RibbedPlates和