机械制造技术基础 双语班3.doc

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1、FinalExaminationPaperfor"FundamentalsofMachineManufacturingTechnology^^NameClassSerialNopointsClosePart(2Hours,65points)1Explainthefollowingconcepts(10points)RakeangleToolReferenceplaneDownmillingOperationInsufficientlocation2Answerthefollowingquestions(20points)(1)Whatarethefunctionsofcuttingfluid?

2、(2points)(2)Whatisthehardnessoftheabrasivewheel?(2points)(3)Whatcausestheerrorcoping?(2points)(4)Whatarethemainaspectsofmachinedsurfacequality?Enumerateandexplaintheformsofgrindingbum.(4poins)(5)Whatisupmillinganddownmilling?Whataretheiradvantagesanddisadvantages?(2points)(6)Howdoesthebuildupform?Ex

3、plainthemainfactorstoaffecttheformationofbuildup.(4points)(7)Whatarethemainfactorsinfluencingthetoollife?Howdotheyinfluencethetoollife?(4poin⑸1Analysisandcalculation(35points)(1)DrawaschematicFiguretoshowandexplaintheexternalandinternaltransmissionchainwhenhobbingastraightgea匚(1Opoints)(2)Fig.listhe

4、schematicfiguretoshowthecuttinglayerandchipformation.Pleaseimposetheforcesonthechipandcuttinglayertomaintainthebalance,andexplaintheinflueneeofthecuttingtoolgeometry(rakeangle,reliefangle,etc)andcuttingparameters(speed,feed,andbackengagement)onthecuttingforces.(15points)(3)Thematerialforonepartis2Cr

5、l3,anditsmachiningsequenceis,(1Opoints)(a)boringtheinnerholeto031.8；°"mm；(b)cyaniding(氧化处理)，ensurethedepth10；(c)grindingtheinnerholetodimension032為器加加,andensurethedepthofcyaniding0.1〜0.3min；Drawthedimensionalchainandcalculatethedimension‘0fortheoperationcyaniding.Figure1OpenPart(30minutes,20points)T

6、hepictureshowsaparttobemachined,thebatchsizeismedium.Now(1)Planthemachiningprocess;(2)Drawapicturetoshowthelocationmethodandanalyzehowmanyfreedomshavetobecanceledwhendrilling6-(j)20mmholes.Referenceanswers1Rakeangle:theanglebetweentherakesurfaceandthereferenceplane(measuredinmainsection)ToolReferenc

7、eplane:Toolreferenceplaneisaplanewhichpassesthroughadesignatedpointonthecuttingedgeandisperpendiculartothevectorveofcombinedspeed.Downmilling:Thevelocityofthecontactpointonthemillingtoolisinthesamedir