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1、Gearboxshellmachiningprocessdesign《ManufacturingEngineeringTechnology—Machining》MechanicalIndustryPressInMarch2004version1p560—564（Seropekalpakjian）（StevenR.Sch）AbstractGearboxshellisamecomplexstructureofsparepartsboxits

2、highprecisioncomplexprocesstheprocessingqualitywillaffecttheoverallperfmanceenginesoithasbecometheenginemanufacturersfocuspartsone.Machiningprocessplanningmustguaranteethemachiningqualityofpartstomeetthetechnicalrequirem

3、entsstipulatedindrawingsatthesametimeshouldalsohavehighproductivityefficiency.Therefemachiningprocessplanningdesignisanimptantwkrequiresdesignersmusthavearichexperienceinproductionpracticewiderangeofmechanicalmanufacturi

4、ngtechnologybasictheyknowledge.Inthespecifiedprocedureshouldaccdingtotheproductionofpartstheexistingequipmentconditionstakingtheprocessingqualityintoaccountproductivityeconomyrequirementsafterrepeatedanalysiscomparisonto

5、determinetheoptimalthebestsolution.1.TechnicalacteristicsofthegearboxshellThegearboxshellprocessfeaturesare:thestructureofcomplexshapeprocessingplanemethanholesunevenwallthicknessstiffnessislowprocessingofhighprecisionty

6、picalofboxtypeprocessingpart.Themainprocessingofthesurfaceofcylinderblocktopsurfacethemainbearingsidecylinderbethemaincamshaftbearingbeholessoontheywilldirectlyaffectthemachiningaccuracyoftheengineassemblyprecisionperfma

7、ncemainlyrelyonprecisionequipmentindustrialfixturesreliabilityprocessingtechnologytoensurethereasonableness.2.ThegearboxshellprocessdesignprinciplesthebasisDesignTechnologyprogramshouldbetoensureproductqualityatthesameti

8、megivefullconsiderationtotheproductioncyclecostenvironmentalprotectionbasedontheenterprisesabilitytoactivelyadoptadvancedprocesstechnologyequipmentconstantlyenhancetheirleveloftechnology.Gearboxshellmachiningprocessdesig

9、nshouldfollowthefollowingbasicprinciples:Therefetherefinementofroughistoimprovetheproductivityofthemostpromisingwayout.Ftheengineblockproductionlinecanberoughinpartsonlinepremillingsixfaceremovingmostofthemargintofacilit

10、atedirectonlineparts.3.2MachiningprocessionprocessingofthebenchmarkChoosetherightprocessingtechnologybaseisdirectlyrelatedtotheprocessingqualitycanensuretheparts.Generallyspeakingprocessbenchmarkingcanbedividedintocoarse

11、finereferencebase.3.2.1CoarsereferencebaseThebaselineftheonlinethickroughwhichisparticularlyimptantthechoiceofbenchmarkcrudeifcrudebenchmarkchoiceunreasonablewilltheunevendistributionofmachiningallowanceprocessingsurface

12、offsetsresultinginwaste.Inthecylinderproductionlinewehaveadoptedfthecoarsesideofthebase3.2.2FinereferencebaseRefinedthebaseofthisboxftheengineblockpartsthegeneraluseof“sidetwosales“fafullrangeofunifmbenchmarksFthelongera

13、utomatedproductionpositioning.Inthegearboxshelloftheprocesswehaveadoptedtothesidebottomthespindleholepositioningintheprocessingcenterontheprocess.3.3MachiningProcessingStagesprocessesofthearrangementsOftenapartofmanyappa

14、rentneedfprocessingofcoursethesurfacemachiningaccuracyaredifferent.ProcessingofhighprecisionsurfaceoftenafterrepeatedprocessingAsftheprocessingofthesurfaceoflowprecisiononlyneedtogothroughonetwoonthelist.Thuswhenthedevel

15、opmentprocessindertoseizethe“processinghighprecisionsurface“thisconflictthereasonablearrangementprocessesrationaldivisionstageofprocessing.Arrangethederoftheprincipleofprocessis:afterthefirstcoarserefinedthefirstsurfacea

16、ftertheholethefirstbenchmarkother.Intheengineblockmachiningthesameshouldfollowthisprinciple.3.3.1roughingstageengineblockmachiningprocessThearrangementsfroughingprocesstofullycarryoutroughroughtrimmostofthemarginindertoe