注塑成型熔接線性能的實驗研究和數(shù)值模擬.pdf

1、鄭州大學碩士學位論文注塑成型熔接線性能的實驗研究和數(shù)值模擬姓名：肖長江申請學位級別：碩士專業(yè)：材料加工工程指導教師：申長雨2003.4.1鄭州大學工學碩」論文Abstract坷ectionmoldingisoneofthemostimportantprocessingmethodsforproducingplasticpartsHowevertherearestillseveralunresolvedproblemsthatconfou

2、ndtheoverallsuccessoftheinjectionmoldingprocess，Theformingofweldlinewhereverpolymerflowfrontmeetisoneofthem.Weldlinesformbecauseofthepresenceofinsertscoresabruptchangeingeometryalongtheflowpathandmult中l(wèi)egatesthatdivideth

3、epolymermeltduringflowinthemold.Ithasbeenobservedthatthepresenceofweldlinessignificantlyreducesthemechanicalpropertyofinjectionmoldedparts.Thereforeinrecentyearstheanalysisoninjectionmoldedpartswithweldlineobtainsglobalc

4、oncernsthisis.ontheonehand，duetolargescalecomplexpartsgraduallymanifold，ontheotherhandthepeopledesiresontheappearanceandinternalperformanceofpartsareincreasinghigh，howtoenhancetheperformanceontheweldlindareabecomesinvest

5、igativeemphasis.onthebasisoftheexperimentsandthenumericalsimulations，thepaperoptimizedthemechanicalpropertyintheweldlineareaofinjectionmoldedparts，thedetailsofpaperareasfollowing:(1)TheoreticallyIanalysedtheformingcause.

6、formingmechanism.morphologicalstructureofweldlineanditsefectonthemechanicalpropertyofinjectionmoldedpartsdiscussedthediferentkindsoffactorthataffectweldline.suchasmaterial.processingcondition(melttemperaturemouldtemperat

7、ureinjectionpressure.packingpressurepackingtimeinjectionspeed)andthemeasuresforenhancingthemechanicalpropertyofinjectionmoldedpartswithweldline(2)ByexperimentthatthechangeofmelttemperatureafectstheZytel70G33Lpartswithwel

8、dlineandnonweldlinehasbeenstudied.Experimentshows:alongwithmelttemperatureincreasingthetensilestrengthofpartswithweldlineandnonweldlinebothenhancewhereasthestretchingstrainofonesbothfall.ontheconditionofthepartswithoutwe

9、ldlinethevarianceoftensilestrengthisataveryslowspeedbutitisintensifytentimesonthepartswithweldlinethediferenceismostlydecidedbythefiberorientationstructureandthemolecularmotion(3)UsingTaguchimethodrespectivelyexperimente