变速箱壳体加工工艺外文翻译Word下载.doc

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指导教师（职称）XXXXXX

郑州科技学院机械工程系

二○一三年五月十八日

Gearboxshellmachiningprocessdesign

《ManufacturingEngineeringandTechnology—Machining》

MechanicalIndustryPressInMarch2004,version1p560—564

（Seropekalpakjian）（StevenR.Schmid）

Abstract

Gearboxshellisamorecomplexstructureofsparepartsbox,itshighprecision,complexprocess,andtheprocessingqualitywillaffecttheoverallperformanceengine,soithasbecometheenginemanufacturer'

sfocuspartsone.Machiningprocessplanningmustguaranteethemachiningqualityofparts,tomeetthetechnicalrequirementsstipulatedindrawings,atthesametimeshouldalsohavehighproductivityandefficiency.Therefore,machiningprocessplanningdesignisanimportantwork,requiresdesignersmusthavearichexperienceinproductionpracticeandwiderangeofmechanicalmanufacturingtechnologybasictheoryknowledge.Inthespecifiedprocedure,shouldaccordingtotheproductionofpartsandtheexistingequipmentconditions,takingtheprocessingqualityintoaccount,productivityandeconomyrequirements,afterrepeatedanalysisandcomparison,todeterminetheoptimalorthebestsolution.

1.TechnicalCharacteristicsofthegearboxshell

Thegearboxshellprocessfeaturesare:

thestructureofcomplexshape;

processingplane,morethanholes;

unevenwallthicknessandstiffnessislow;

processingofhighprecisiontypicalofbox-typeprocessingpart.Themainprocessingofthesurfaceofcylinderblocktopsurface,themainbearingside,cylinderbore,themainandcamshaftbearingboreholesandsoon,theywilldirectlyaffectthemachiningaccuracyoftheengineassemblyprecisionandperformance,mainlyrelyonprecisionequipment,industrialfixturesreliabilityandprocessingtechnologytoensurethereasonableness.

2.Thegearboxshellprocessdesignprinciplesandthebasis

DesignTechnologyprogramshouldbetoensureproductqualityatthesametime,givefullconsiderationtotheproductioncycle,costandenvironmentalprotection;

basedontheenterprisesabilitytoactivelyadoptadvancedprocesstechnologyandequipment,andconstantlyenhancetheirleveloftechnology.Gearboxshellmachiningprocessdesignshouldfollowthefollowingbasicprinciples:

2.1Theselectionofprocessingequipment

Theprincipleofselectionadoptedtheprincipleofselectionadoptedtheprincipleofcombiningrigid-flexible,processingeachhorizontalmachiningcenterislocatedmainlysmalloperationswithverticalmachiningcenter,thekeyprocessacrankhole,cylinderhole,balancershaftholeHigh-speedprocessingofhigh-precisionhorizontalmachiningcenter,anupperandlowernon-criticalprocessesbeforeandafterthefour-dimensionalhigh-efficiencyroughmillingandhaveacertainadjustmentrangeofspecialmachineprocessing;

2.2Concentrationprocessprinciple

Focusonakeyprocessinprincipleprocessthebodycylinderbore,crankshafthole,BalanceShaftholesurfacefinishingandthecombinationofprecisionmillingcylinderhead,usingaprocessfocusedonasetupprogramtocompleteallprocessingelementsinordertoensureproductaccuracyThekeyqualityprocessestomeetthecylindercapacityandtherelevanttechnicalrequirements;

3.Thegearboxshellmachiningprocessdesignthemaincontent

Gearboxshellcomplexstructure,highprecision,argesize,isthin-walledparts,thereareanumberofhighprecisionplaneandholes.Engineblockmachiningprocesscharacteristics;

mainlyflatandtheholeprocessing,processingofflatgenerallyuseplaning,millingmethodssuchasprocessing,processingofholeusedmainlyboring,processingandmulti-purposedrillingholes.Asthecylindercomplexstructure.sohowtoensurethatthemutualpositionofthesurfaceprocessingprecisionisanimportantissue.

3.1Theselectionofblank

GearboxshellonthematerialsusedaregenerallygraycastironHT150,HT200,HT250,thereisalsocastaluminumorsteelplate,thisengineblockusinghigh-strengthalloycastiron.Cylinderintheprocessingpriortoagingtreatmentinordertoeliminatestressandimprovetheroughcastingmechanicalproperties.

Improvetheroughaccuracy,reductionofmachiningallowance,istoimprovetheautomatedproductionlinesystemproductivityandprocessingqualityoftheimportantmeasures.Astheforeignbox-typepartsofroughqualityandhighprecision,anditsproduction-linesystemhasbeenimplementeddirectlyontheblankline,notonlyeliminatingtheneedforblankcheckdevicealsosavestheroughqualityproblemsduetowasteofmachiningtime,increaseoverallefficiency.Therefore,therefinementofroughistoimprovetheproductivityofthemostpromisingwayout.Fortheengineblockproductionline,canberoughinpartson-linepre-millingsixface,removingmostofthemargin,tofacilitatedirecton-lineparts.

3.2Machiningprocessselectionandprocessingofthebenchmark

Choosetherightprocessingtechnologybaseisdirectlyrelatedtotheprocessingqualitycanensuretheparts.Generallyspeaking,processbenchmarkingcanbedividedintocoarseandfinereferencebase.

3.2.1Coarsereferencebase

Thebaselinefortheon-linethickrough,whichisparticularlyimportantthechoiceofbenchmarkcrude,ifcrudebenchmarkchoiceunreasonable,willtheunevendistributionofmachiningallowance,processingandsurfaceoffsets,resultinginwaste.Inthecylinderproductionline,wehaveadoptedforthecoarsesideofthebase;

3.2.2Finereferencebase

Refinedthebaseofthisboxfortheengineblockparts,thegeneraluseof"

sidetwosales"

forafullrangeofuniformbenchmarks,Forthelongerautomatedproductionpositioning.Inthegearboxshelloftheprocess,wehaveadoptedtotheside,bottomandthespindleholepositioning,intheprocessingcenterontheprocess.

3.3MachiningProcessingStagesandprocessesofthearrangements

Oftenapartofmanyapparentneedforprocessing,ofcourse,thesurfacemachiningaccuracyaredifferent.Processingofhighprecisionsurface,oftenafterrepeatedprocessing;

Asfortheprocessingofthesurfaceoflowprecision,onlyneedtogothroughoneortwoonthelist.Thus,whenthedevelopmentprocessinordertoseizethe"

processinghighprecisionsurface,"

thisconflict,thereasonablearrangementprocessesandrationaldivisionstageofprocessing.Arrangetheorderoftheprincipleofprocessis:

afterthefirstcoarserefined,thefirstsurfaceafterthehole,thefirstbenchmarkother.Intheengineblockmachining,thesameshouldfollowthisprinciple.

3.3.1roughingstageengineblockmachiningprocess

Thearrangementsforroughingprocess,tofullycarryoutroughrough,trimmostofthemargininordertoensureproductionefficiency;

3.3.2semi-finishingphaseoftheengineblockmachining

Inordertoensuretheaccuracyofthemiddleofsomeimportantsurfaceprocessing,andarrangesomesemi-finishingoperations,willberequiredaccuracyandsurfaceroughnessofthesurfaceofthemiddleofsomeprocessingtocomplete,whiledemandingthesurfaceofsemi-finished,toprepareforfuturefinishing;

3.3.3Thefinishingstage

Thefinishingstageofrequiringhighaccuracyandsurfaceroughnessofthesurfaceprocessing;

3.3.4secondaryprocessing

Secondaryprocessingsuchassmallsurfacescrewholes,youcanfinishofthemajorsurfaceaftertheonehand,whentheworkpiecedeformationprocesslittleimpactatthesametimealsoreducedtherejectionrate;

Inaddition,ifthemainsurfaceofawaste,thesesmallthesurfacewillnothavetobeprocessed,thusavoidingawasteofman-hours.However,iftheprocessingisveryeasyforasmallsurfacebumpsthemainsurface,itshouldbeplacedonasmallsurfacefinishpriortothemainsurfacefinishing;

3.3.5makeproperarrangementsforsecondaryprocesses

Makeproperarrangementsforsecondaryprocessessuchasproductinspectionprocess,inpartroughingstage,thekeyprocessbeforeandafterprocessing,sparepartsalltheprocessinghasbeencompleted,shouldbeappropriatearrangements.

Stageofprocessingdivision,hasthefollowingadvantages:

First,itcantakemeasurestoeliminatetheroughworkpieceafterthestress,toensureaccuracy;

second,finishingontheback,andwillnotdamageduringtransportthesurfaceoftheworkpiecehasbeenprocessed;

again,firstroughingthesurfacedefectscanbedetectedearlyandpromptlydealwithrough,donotwasteworkinghours.Butmostsmallparts,donotsubverythin.

3.4Thegearboxshellsurfaceofthemainprocessingandsecondaryprocesses

3.4.1Planeprocessing

Planeprocessingatpresent,themillingofengineblocksistheprimarymeansofplanarprocessing,domesticmillingfeedrateisgenerally300-400mm/min,andforeign2000-4000mm/minmillingfeedratecomparedtofarcry,tobeonincreasing,therefore,improvethemillingfeedrate,reduceoverheadtimeistoimprovetheproductivityofthemajormeansoffinishinganumberofplaneengineblockwhenthemillingfeedratetoreach2399mm/min,greatlyimprovedefficiency;

Topsurfaceofthecylindermillingisakeyprocessintheprocess,theflatnessrequirementsfor0.02/145mm,thesurfaceroughnessofRa1.6um.Processinginthecylinder,theuseofsideandspindlebearingborepositioning,top,bottomandmiddlevagayonlyaperturewhileprocessingusedintheprocessinglineoutsideoftheknifedevicecanbettermeettheengineblockmachiningaccuracy;

3.4.2Gener