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1、毕业设计专业:机械设计制造及其自动化传动箱箱盖加工工艺规程及夹具设Designprocessplanningandfixturegearboxcover摘要 在生产加工过程中,通过一定的手段使生产对象(原材料,毛坯,零件或总成等)的质和量的状态发生直接变化的过程叫工艺过程,如毛坯制造,机械加工,热处理,装配等都称之为工艺过程。在制定工艺过程中,要确定各工序的安装工位和该工序需要的工步,加工该工序的机车及机床的进给量,切削深度,主轴转速和切削速度,该工序的夹具,刀具及量具,还有走刀次数和走刀长度,工件的定位方案的采用,最后
2、计算该工序的基本时间,辅助时间和工作地服务时间。对应工序的夹具设计,夹具设计所采取的定位方案以及夹紧方案,方案的可行性分析,以及各个零部件的装配图和多视图。在本次设计过程,首先对看已给的传动箱箱盖,分析它的形位公差以及配合,然后通过查资料确定毛坯的材料、形状、尺寸等。然后经过分析得出各个加工路线的基准,通过工序集中和分散原则拟定出最优的工艺路线。通过每一道工序选出合适的机床和刀具,并确定出每道工序的加工余量等。确定夹具的定位和夹紧方法,选定合适的定位和夹紧装置,并对其进行误差分析和夹紧力计算,最后用CAD做出夹具的装配图
3、和关键的零件图。关键词:工序 ; 工艺分析 ;定位方案 ;夹具设计;Abstract Intheproductionprocess,throughsomemeanstomakeproductionobject(rawmaterials,semifinishedproduct,partsorassembly,etc.)stateofthequalityandquantityoftheprocessiscalleddirectchangehappenedprocess,suchasblankmanufacturingpr
4、ocess,mechanicalprocessing,Heattreatment,assemblingandarecalledtheprocesstechnology.Inmakingprocess,makesuretheprocessofinstallationlocationandtheprocessneedworkstep,processingthisprocessoflocomotiveandmachinetools,cuttingdepth,thefeedspindlespeedandcuttingspeed,
5、thisprocessoffixture,toolsandmeasuringtools,andgowalkingknifenumberandlengthoftheprocess,Alsothepositioningschemeadopted.Finallycalculatedthebasictime,Auxiliarytimeandlocateservicetime.Correspondingprocessoffixturedesign,fixturedesignschemetothefeasibilityofthesc
6、heme,thepositionofeachcomponentanalysis,andtheassemblyandmultipleviews.Inthisdesignprocess,firstofalllookatthegearboxhastocover,analyzeitsformandpositiontolerancesandfit,andthencheckthedatatodeterminetheroughmaterial,shape,sizeandsoon.Thencomethevariousprocessing
7、routesthroughtheanalysisofthebenchmark,throughtheprincipleofcentralizedanddecentralizedprocessestoworkouttheoptimumprocessroute.Througheveryprocesstochoosetherightmachinesandtools,andtodeterminetheallowanceforeachprocessandsoon.Determiningpositioningandclampingfi
8、xturemethodsselectedsuitablepositioningandclampingmeans,anditsclampingforceerroranalysisandcalculation,thefinalassemblyjigmadeCADdrawingsandcriticalpartsofFIG.