外文翻译--注射模成型零件工作尺寸计算方法分.doc

外文翻译AnalysisoftheMethodsforCalculatingtheWorkingDimensionsoftheFormingPartsofInjectionMouldsAbstract:Throughthetheoreticalanalysisofthetwomethodsforcalculatingtheworkingdimensionsofthemouldingpartsofinjectionmoulds，thetheoreticaldefectsexistinginthecalculationoftheworkingdimensionsbyaverageshrinkagemethodandtheproblemexistingintheactualmoulddesignwiththiscalculationmethodwerepointedout.Calculationsofthemouldingdimensionsandtolerancesbylimitedtolerancetolerancewereanalyzedandanactualcalculationexamplewasgiven,whichshowedthatthecalculationbylimitedtolerancemethodcanensuretheaccuracyofthemouldingdimensionsandtolerancesinthedesignofinjectionmoulds.Keywords:injection；moulddesign；workingdimension；toleranceInjectmouldshapingpartworkingsizemeanshapingpartuseshapingformouldpiecesofsomesizedirectly.Itsmaintypeisasfollows,typeandradialsize(includerectangleorspecial-shapedtypeandsizelong,wide,typeofcore),typeordepthandhighsize,typeofcore,typeofcore.Typebetweenthecoreorshapingcentresizeunderhole,whorltypecoreandwhorltypesurroundthesize.Discussinthefront3computingtechnologyofsizeespecially,injectmouldshapingpartworksizeusesizemostcalculateofcalculating.Presentmostplasticsinjectthemoulddesignmanual.Teachingmaterialandreferencematerialadopttheshrinkingratelawequally,thoughthiskindofcomputingtechnologyissimpleandconvenient,existcertainerror,mouldasdesignpieceuseandhavedemandofcooperatinginassembling,ortheprecisionofsizeofmouldingoneisdifficulttoachievethegoalofdesigningwhileexpectingmuch.AstoillustratedinFig.1typicalpart,inpersonwhoshrinkequallyofusingatcalculatingshapingpartsizeofworking,whethertypeandtypecoreadoptthecalculationformulaofthefollowing.Thesizeofradial:Type:Lm=Ls+LsScp-(3/4)z0core:lm=ls+lsScp+(3/4)z0highsize.Type:Hm=Hs+HsScp-(2/3)z0core:hm=hs+hsScp+(2/3)0zFig.1mouldmouldpiecesofalltothesketchmapofthesizea-Mouldtypecoreb-Mouldpiecesofc-MouldtypeThesizeofcentre-to-centrespacing+（）inthetype-MouldthepermissionpublicerrandvalueScpofone-Mouldaverageshrinkratezofamaterial-ThemouldmakespublicerrandCalculationformulatotheabovelistedworkingsizeofmould,mouldtomarkmethodand1Fig.isitshouldchangeandmarktheformofpublicerrandaccordingtosuremethodinordertobemouldoneinFig.1toaccordwithoriginalpublicerrandofpiece,carryonmouldworkthecalculationofsizeaccordingtoformulatheabove.Butthebasesofderivingoftheseformulaearebymouldingtheaverageshrinkrateofone.，Itisaverageinpartinmouldshapingformanufacturepublicerrandvalueandmouldletwithalwayswearingandtearingamount(11)asestablishingbyconclusioningthatparameterdrawing.Namelymouldmakevalue,szofpublicerrand,isitmouldpieceallow1/(one4/5z),publicerrandofvalueandmouldisititspendstobealways15ofwearingandtearingetc.tolettofetch,isitmouldpermission1/(15,first4/),publicerrandofvalueofpiecetofetch.UndertherealmouldworkingstateItswearingandtearingactuallyamountusuallyfetches0.020.05mm,itmakepublicerrandvaluefetchIT3oneIT6grademakepublicerrandasthemouldusually.Inadditionmouldshrinkrateofpiecebefluctuated,personwhofluctuateitmouldtohaveindirectradiotomoreincreaseincreasespiecesofsizeatthesametime；Makeerrormouldsizeofpieceisitpresentcubicrootrelationincreasetoincreaseatthesametime；ButpersonwhowearandtearmouldincreasetheirofsizeofpieceincreaseslowlyatthesametimealwaysThereforelargesizemouldpiecesoffluctuationofpersonwhoshrinktoisitmouldpiecesofmainfactorofpublicerrandtoinfluence,shouldinjectprocessconditionsandselectforusepersonwhoshrinkfluctuatelittleplasticssteadily.Onthecontrary,astothethingthatsmallsizemouldpiece,isitmouldpiecesofmainfactorofpublicerrandmouldmanufacturepub