（机械工程专业毕业论文）模内覆膜注塑件微孔发泡成型技术研究.docx

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1、模内覆膜注塑件微孔发泡成型技术研究模内覆膜注塑件微孔发泡成型技术研究摘要采用超临界微孔发泡注射成型除了具有比传统注塑工艺更加经济、高效、环保的优点，其产品的力学性能方面也更加优越，已逐渐成为微孔注射成型工业化生产的主流技术。模内覆膜装饰技术同样是目前塑料表面装饰技研究的热点，已被广泛的应用于对产品外观要求较高的笔记本电脑外壳、及汽车内饰件等产品上。随着越来越多的消费者对产品性能要求和外观表面质量要求的提高，集成两种技术的成型工艺成为一种趋势。本文利用田口正交试验设计方法，研究薄膜厚度、模具温度、熔体温度、注射时间、与填充量和SCF含量6个因子对ABSM品的泡孔半径及翘曲变形影响的显著性差异。为

2、了进一步探讨微观形态与宏观性能之间的关系，本文还对PC/ABS覆膜微孔发泡的内部形态结构和力学性能进行了研究。研究表明：在考虑的6个因子中，对制品泡孔半径的影响程度从大到小依次为：注射时间模具温度SCF含量薄膜厚度熔体温度预填充量，且以泡孔半径为响应变量的最优组合为模具温度45cC,熔体温度2701C,注射时间1，预填充量93%，SCF含量045%，薄膜厚度02mm;对制品总翘曲变形的影响程度从大到小依次为：预填充量注射时间SCF含量熔体温度模具温度薄膜厚度，且以制品泡孔半径为目标的最优组合为模具温度45eC,熔体温度270匕，注射时间1s,预填充量98%，SCF含量0.45%,薄膜厚度。.2

3、mm。对制品综合指标的影响程度排序从大到小依次为：注射时间预填充量SCF含量模具温度熔体温度薄膜厚度。且最优工艺组合参数是：模具温度45P，熔体温度270*C,注射时间1s,预填充量93%，SCF含量0.45%，薄膜厚度0.2mm。通过进一步分析，可知最优组合对提高注制品的成型质量非常明显。通过回归分析建立的翘曲变形和泡孔半径的经验模型，经证实拟合较好。未覆膜PC/ABS发泡塑件的冲击强度随着微孔直径的增加呈线性下降趋势，而覆膜发泡塑件的冲击性能与内部微观结构之间并没有存在着明显的线性关系。在微观形态方面，相同工艺参数条件下，受薄膜滞热影响，覆膜发泡塑件的泡孔直径比未覆膜发泡塑件的泡孔直径略大

4、，表皮层厚度比未覆膜的发泡制品的还小；在宏观力学性能方面，相同工艺参数条件下的覆膜发泡制品的冲击强度均比未覆膜的冲击强度还高。对模内覆膜制品的表面形貌及耐磨性能的研究表明了模内覆膜技术除了能提高发泡制品的表面质量，还能提高制品表面的耐磨性。关键词：超临界流体，微孔发泡，工艺参数，模内覆膜，机械性能.ResearchonIn-mou1dDecorationInjectionMou1dedPartsUsingMicroce11u1arFoamTechno1ogyAbstractComparedwiththetraditiona1injectionmo1dingprocess,theusageofs

5、upercritica1N2inmicroce11u1arfoaminjectionmo1dingnoton1yhastheadvantages1ikeeconomica1,efficiency,environmenta11yfriend1iness,buta1soitssuperiormechanica1performanceofproducts,whichgradua11yenab1esittobecomethemainstreamtechno1ogiesofmicroce11u1arinjectionmo1dingindustria1production.Therefore,in-mou

6、1ddecorationinjectionmo1dingtechno1ogyissimi1ar1ybecomingthehotspottechno1ogyofsurfacedecorationtechno1ogyatpresent,whichhasbeenwide1yusedinproductsthatwithhigherappearancerequirements,suchastheoutershe11ofnotebookcomputer,automotiveinteriorpartsandsoon.Withconsumersrisingrequirementsforproductsperf

7、ormanceandthequa1itydemandsofsurfaceappearance,integratingthetwotechno1ogiesbecomeatrend.Consideringsixfactors,suchasmo1dtemperature,me1ttemperature,injectiontime,pre-fi11edvo1ume,SCFvo1umeandthethicknessoffi1ms,thesignificantdifferencesinf1uenceofeachfactoronwarpingdeformationandbubb1ediameterofABS

8、productwasresearchedbyusingTaguchiorthogona1experimentdesignmethodinthispaper.Inaddition,todiscussedthere1ationshipbetweenmicrostructureandmacromechanica1properties,theinterna1morpho1ogica1structureandmechanica1propertiesofin-mou1dinjectiondecorationPC/ABSp1asticspartswithmicroce11u1arfoaminjectionm

9、o1dingwerestudied.Researchshowsthattheinf1uencedegreeofthesixconsideringfactorsonce11radiusfrom1argetosma11areinjectiontime,mo1dtemperature,thecontentofSCFfi1mthickness,me1ttemperatureandpre-fi11edvo1ume.Atthesametime,theoptima1processparametersbasedontheindexofce11radiuswasthecombinationofprocessin

10、gparameterthatmou1dtemperatureis45,me1ttemperatureis270,injectiontimeisIs,pre-fi11edvo1umeis93%,thecontentofSCFis0.45%,thethicknessoffi1msis0.2mm.Whi1etheinf1uencedegreeofthefactorsonce11radiusfrom1argetosma11arepre-fi11edvo1ume,injectiontime,thecontentofSCF,me1ttemperature,mo1dtemperatureandfi1mthi

11、cknessAswe11as,theoptima1processparametersbasedontheindexofwarpingdeformationwasthecombinationofprocessingparameterthatmou1dtemperatureis45,me1ttemperatureis270,injectiontimeisIs,pre-fi11edvo1umeis98%,thecontentofSCFis0.45%,andthethicknessoffi1msis0.2mm.Inthesameway,theinf1uencedegreeofthefactorsonc

12、omprehensiveindexfrom1argetosma11areinjectiontime,pre-fi11edvo1ume,thecontentofSCF,mo1dtemperature,me1ttemperatureandfi1mthicknessAswe11as,theoptima1processparametersbasedontheindexofwarpingdeformationwasthecombinationofprocessingparameterthatmou1dtemperatureis45,me1ttemperatureis270,injectiontimeis

13、Is,pre-fi11edvo1umeis93%,thecontentofSCFis0.45%,andthethicknessoffi1msis0.2mm.Furtherana1ysisindicatedthattheoptimizationcou1dgreat1yimprovethequa1ityofinjectionparts.Experiencemode1estab1ishedbasedonregressionana1ysis,whichhasprovedtobeaverygoodmode1afterinspectioncertificate.TheimpactstrengthofPC/

14、ABSfoamp1asticpartsisdec1ined1inear1ywiththeincreasesofthece11diameter,whi1ethere1ationshipbetweentheimpactstrengthandtheinterna1morpho1ogica1structureofp1asticpartswhichusein-mou1ddecorationtechno1ogyisnotobvious.Atthemicroaspect,thebubb1ediameteroffoamp1asticwhichusein-mou1ddecorationtechno1ogywas

15、s1ight1y1argerthanfoamp1asticunderthesameconditionofprocessparameters,Instead,thethicknessofepidermis1ayeroftheformerissma11er.Atthemacroaspect,theimpactstrengthoffoamp1asticpartswhichusein-mou1ddecorationwashigherthanthatmicroce11u1arfoaming.Researchonthesurfacemorpho1ogyandthewear-resistingperform

16、anceofin-mou1ddecorationp1asticpartsshowsthatin-mou1ddecorationinjectionmo1dingcannoton1yimprovethequa1ityofthesurfaceofparts,buta1socanincreasetheabrasionresistanceonthesurfaceoftheproducts.Keywords：Supercritica1f1uid,Microce11u1arfoaming,Processparameters,In-mou1ddecoration,Mechanica1properties.目录摘要IAbstractII目录IV第一章绪论11.1 引言11.2 模内覆膜装饰技术2121模内覆膜注射成型工艺21.2.2模内覆膜装饰技术研究现状21.3 微孔发泡注射成型技术41.3.1 微孔发泡注射成型工艺41.3.2