塑料件设计指导《Plastic Design Guide》

1、Engineering Polymers / DuPont (Korea) Inc.1Version 1.0Engineering Polymers / DuPont (Korea) Inc.2Design ConceptDesign FlowCAECADPlastic Parts Design GuideEngineering Polymers / DuPont (Korea) Inc.3Typical Wall ThicknessFor Engineering PolymersGeneral applications12345670millimetric scaleSpecial appl

2、icationsEngineering Polymers / DuPont (Korea) Inc.4Gate Location & StrengthGate050100150200250300TensionCompressionFlowTranverseMPaZYTEL 70G33 23 C, DAMTensile StrengthEngineering Polymers / DuPont (Korea) Inc.5Gate Location & ShrinkageGateMaterial Flow Affects OrientationFlow DirectionTrans

3、verse DirectionEngineering Polymers / DuPont (Korea) Inc.6Gate Location & ShrinkageUnreinforced Higher Shrinkage in Direction of Molecular Orientation/FlowGateFlow DirectionTransverse DirectionEngineering Polymers / DuPont (Korea) Inc.7Gate Location & ShrinkageGateFlow DirectionTransverse Di

4、rectionGlass ReinforcedGlass Fiber Resists Shrinkage in Direction of Alignment/FlowEngineering Polymers / DuPont (Korea) Inc.8Gate Location & ShrinkageGateFlow DirectionTransverse DirectionMineral ReinforcedMineral Resists Shrinkage More Uniformly in All DirectionsEngineering Polymers / DuPont (

5、Korea) Inc.9Shrinkage & WarpageShrinkage Increases with Wall ThicknessHigher Shrinkage Lower ShrinkageEngineering Polymers / DuPont (Korea) Inc.10Shrinkage & WarpageUneven ShrinkageEngineering Polymers / DuPont (Korea) Inc.11Shrinkage & WarpageBad FlatnessEngineering Polymers / DuPont (K

6、orea) Inc.12Shrinkage & WarpageGood FlatnessEngineering Polymers / DuPont (Korea) Inc.13Shrinkage & WarpageCase on a plate + rib profilebGatehwaFlow angleIsochronesGateEngineering Polymers / DuPont (Korea) Inc.14Shrinkage & WarpageSSin flowSSThinThick ba1234Wall thickness mmShrinkage %Tr

7、ansverse to flowIn flow1.5Glass reinforced materialsDeformation trendEngineering Polymers / DuPont (Korea) Inc.15Shrinkage & WarpageSSin flowSSThinThick1234Wall thickness mmShrinkage %TransverseIn Flow1.5baDeformation trendUnreinforced materialsEngineering Polymers / DuPont (Korea) Inc.16Gate Lo

8、cation & Shrinkage Bad Gate LocationGateEngineering Polymers / DuPont (Korea) Inc.17Gate Location & ShrinkageFlow StepsEngineering Polymers / DuPont (Korea) Inc.18Shrinkage & WarpageGateGlass reinforced materialsEdge EffectEngineering Polymers / DuPont (Korea) Inc.19Shrinkage & Warpa

9、geEffect of Machine Settings on ShrinkageEngineering Polymers / DuPont (Korea) Inc.20Shrinkage & WarpageNon-uniform wallsWrongRightEngineering Polymers / DuPont (Korea) Inc.21Sizing to Reduce WarpageMax R Reduce Stress Conc. Reduce WarpageTT2Bow-InShrinkage & WarpageEngineering Polymers / Du

10、Pont (Korea) Inc.22Shrinkage & WarpageNon-uniform Wall Thickness Contributes To Higher Molded-in Stress Warpage Sinks VoidsSinkVoid In Thicker SectionEngineering Polymers / DuPont (Korea) Inc.23Shrinkage & WarpageOutside RadiusFollowsInside RadiusEngineering Polymers / DuPont (Korea) Inc.24G

11、ood Design3TGateGateBadTBetterBestEngineering Polymers / DuPont (Korea) Inc.25Shrinkage & WarpageCooling Side to Side HOTCOOLPARTEngineering Polymers / DuPont (Korea) Inc.26Sizing to Reduce Stress Concentration Factor (SCF)R/TStress Concentration Factor3.0 2.5 2.0 1.5 1.00 0.2 0.4 0.6 0.8 1.0 1.

12、2 1.4P = Applied Load R = Fillet Radius T = ThicknessEngineering Polymers / DuPont (Korea) Inc.27Sharp CornersSHARP CORNERSEngineering Polymers / DuPont (Korea) Inc.28Weld Line & Strength1 Gate2 GateWeld LineEngineering Polymers / DuPont (Korea) Inc.29Weld Line & StrengthTensile Strength Wel

13、d Line vs. Flow Direction020406080100120140160180ZYTEL70G33MINLON22CRYNITE530Flow DirectionKnit LineMPa23 C, 50% RHEngineering Polymers / DuPont (Korea) Inc.30Weld Line & Strength Material TypeFiller TypeTensile Strength MPa% RetainedNylon 66 Nylon 66 Polyprop PolypropNone 40% Glass None 30% Gla

14、ss79 199 37 69 77 103 32 2397 52 86 34One GateTwo GateEngineering Polymers / DuPont (Korea) Inc.31Weld Line & StrengthWeld line, exampleFlowFlowEngineering Polymers / DuPont (Korea) Inc.32Weld Line & StrengthGateWeld LineEngineering Polymers / DuPont (Korea) Inc.33GateWeld Line & Strengt

15、hWeld LineImproved DesignEngineering Polymers / DuPont (Korea) Inc.34SinksRibs and SinksEngineering Polymers / DuPont (Korea) Inc.35SinksRibs and Sinks0.5 T (max. 0.75T)R max. 0.5TbetterD2TTR = TDshould be improved1Sink mark3TEngineering Polymers / DuPont (Korea) Inc.36SinksImproved SinksGrained or

16、Stippled SurfaceTooled DepressionOffset at RibSinkEngineering Polymers / DuPont (Korea) Inc.37SinksRibs DesignBetterBestshould be improvedEngineering Polymers / DuPont (Korea) Inc.38Good Design, StrengthEngineering Polymers / DuPont (Korea) Inc.39Good Design, Strength1X 1.5X 13.3X 27X 30X Relative T

17、orsional StiffnessEngineering Polymers / DuPont (Korea) Inc.40Bad & Good Design, ExampleEngineering Polymers / DuPont (Korea) Inc.41Bad & Good Design, ExampleEngineering Polymers / DuPont (Korea) Inc.42Bad & Good Design, ExampleEngineering Polymers / DuPont (Korea) Inc.43Bad & Good Design, ExampleEngineering Polyme