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1、IntJMaterForm(2009)Vol.2Suppl1:669–672DOI10.1007/s12289-009-0527-4©Springer/ESAFORM2009LASERASSISTEDPOLYMERMOULDINGOFSMALLPARTS1,*111C.Lucignano,F.Quadrini,L.Santo,F.Trovalusci1UniversityofRome“TorVergata”,DepartmentofMechanicalEngineering,ViadelPolitecnico1,
2、00133Rome,ItalyABSTRACT:Smallthermoplasticpartsmaybeefficientlymouldedbymeansofalaserassistedmouldingprocess.Asemi-transparentmouldisusedcombinedwithadiodelasersourcetodirectlyshapepelletsorshreds.Averylowholdingpressureisappliedandnomouldheatingsystemisrequi
3、red;thereforethesizeofthemouldingsystemissmallaswellasthesizeofthemould.Inordertoevaluatethemouldabilityofdifferentthermoplasticmaterials,mouldingtestswerecarriedoutonacrylonitrile–butadiene–styrene(ABS),highdensitypolyethylene(HDPE),polycarbonate(PC),polypro
4、pylene(PP),andpolystyrene(PS).Asinglepelletwasmouldedatatimetoproducethindisks,densitymeasurementsanddifferentialscanningcalorimetry(DSC)werecarriedout.Toshowtheprocesscapabilities,ascrewwasmouldedinHDPE,fromapieceofacalenderedsheet.KEYWORDS:diodelaser,thermo
5、plastics,moulding,laserassistedmanufacturing1INTRODUCTIONsource[1,2].Severalthindisks,20mmindiameter,wereproducedindifferentprocessconditionsandIntherecentpastthegrowinginterestinplasticshassubsequentlycharacterizedbydimensionalanalysisandcausedasignificantin
6、creaseofscientificcontributionsmechanicaltests.Thepelletagglomerationwasgoodasonpolymerprocessing.Themaingoalistoimprovethewellastheaestheticaspect.productqualitywhichstronglydependsontheMicro-partswerealsoproducedbymeansofadiodemanufacturingmethodandtheproce
7、ssparameters.Thelasersource[3].Byusingasimilarmouldingsystem,inmostwidelyusedformingprocessissurelytheinjectionthisworktheauthorsperformedthedirectmouldingofmoulding,thatconsistsintheinjectionofameltedsmalldisksmadeofdifferentmaterials,andofapolymerintoacavit
8、yofdesiredshape.Injectioncomplexpartmadeofhighdensitypolyethylenemouldingisaflexibleproductiontechniqueforthe(HDPE).manufactureofcomplexshaped,thinwalledpolymerproductswithneatshape.Howev
