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1、ComputeraideddesignandanalysisofthespruesystemofaninjectionmouldforopticaldatastoragereplicationD.S.Trifonova,Y.E.Toshevb^InstituteofInformationTechnology^BulgarianAcademyofSciencesy1113Sofia,BulgariabJnstituteofMechanicsandBiomechanics^BulgarianAcad
2、emyofSciences,1113Sofia,Bulgaria4MPartnerNo28BAS,BulgarianAcademyofSciencesIntroductionOpticaldiscmoulding•Theexperiencegaineduptonowininjectionmouldingofopticaldiscsubstrateshasshownthatthemouldoccupiesacentralplaceandisthemostsignificantpartinthepr
3、oductionprocess・•Theobtainingofthegeometricallysimplesubstrate,beingacircularwasherwithwidthof1,2mm,diameterofthecentralhole15mmandexternaldiametervaryingfrom120mmupto300mm,togetherwiththenecessityforprecisecopyingoftheinformationstructure,theaccurac
4、yofthegeometricdimensionsandthelowlevelofbirefringence,implyhighrequirementstowardsthemouldconnectedwithpreciseconstructionandtolerancesoftheorderofmicrons.Definitionofthetechnicalproblemintheopticaldiscmoulding•A"statementoftheproblem99foropticaldis
5、cmouldingstartswiththefundamentaldifficultyoffillingandpackingamouldcavityofmuchgreaterlengththandepth,withoutincurringhighlevelsofmoulded-instressandorientation.•Theapproachapplieduptonowinsolvingtheproblemofcavityfillingandformationofthecentralhole
6、substratehasnotdeclinedfromthebasicmethod・fillingthroughathinfilmcirclegatelocatedattheplace,wherethecentralholeistobeformed.Thisrequirestheuseofacomplexandprecisecroppingpunchsystem,removingthecirclegate,inordertoformthecentralhole.Thepurposeofthepa
7、per•Todevelop3DCADmodelsoftwobasictypesofthespruesystemandtoprovideaprimaryinvestigationtodeterminearangeofgatesizeparametersandcorrectgatelocationtowardscentralholethickness,sothataneasymouldcavityfillingistobeattained,usingthedeveloped3DCADmodelsan
8、dcomputersimulationtechniques・3DCADmodelsofthethespruesystem•Aflowchartofthestages,necessaryforthepurposeofthepresentworkisdeveloped(seeFig.1)•Twobasictypesofthespruesystemdesignofanopticaldiscmouldareconsidered・•Thefirsttypeofthespruesystemdesigncon
