机械制造技术基础双语班3

《机械制造技术基础双语班3》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、FinalExaminationPaperfor'"FundamentalsofMachineManufacturingTechnology^,pointsNameClassSerialNoClosePart(2Hours,65points)1Explainthefollowingconcepts(10points)RakeangleToolReferenceplaneDownmillingOperationInsufficientlocation2Answerthefollowingquestions(20points)(1)Wha

2、tarethefunctionsofcuttingfluid?(2points)(2)Whatisthehardnessoftheabrasivewheel?(2points)(3)Whatcausestheerrorcoping?(2points)(4)Whatarethemainaspectsofmachinedsurfacequality?Enumerateandexplaintheformsofgrindingburn.(4poins)(5)Whatisupmillinganddownmilling?Whataretheira

3、dvantagesanddisadvantages?(2points)(6)Howdoesthebuildupform?Explainthemainfactorstoaffecttheformationofbuildup.(4points)(7)Whatarethemainfactorsinfluencingthetoollife?Howdotheyinfluencethetoollife?(4points)1Analysisandcalculation(35points)(1)DrawaschematicFiguretoshowan

4、dexplaintheexternalandinternaltransmissionchainwhenhobbingastraightgear.(lOpoints)(2)Fig.listheschematicfiguretoshowthecuttinglayerandchipformation.Pleaseimposetheforcesonthechipandcuttinglayertomaintainthebalance,andexplaintheinfluenceofthecuttingtoolgeometry(rakeangle

5、,reliefangle,etc)andcuttingparameters(speed,feed,andbackengagement)onthecuttingforces.(15points)(3)Thematerialforonepartis2Crl3,anditsmachiningsequenceis,(lOpoints)(a)boringtheinnerholeto031.8严mm；(b)cyaniding(氧化处理)，ensurethedepth5；(c)grindingtheinnerholetodimension032鳥眾

6、加加,andensurethedepthofcyaniding0・l~0・3mm；DrawthedimensionalchainandcalculatethedimensionL0fortheoperationcyaniding.Figure1OpenPart(30minutes,20points)Thepictureshowsaparttobemachined,thebatchsizeismedium.Now(1)Planthemachiningprocess;(2)Drawapicturetoshowthelocationmeth

7、odandanalyzehowmanyfreedomshavetobecanceledwhendrilling6-(])20mmholes・Referenceanswers1Rakeangle:theanglebetweentherakesurfaceandthereferenceplane(measuredinmainsection)ToolReferenceplane:ToolreferenceplanePrisaplanewhichpassesthroughadesignatedpointonthecuttingedgeandi

8、sperpendiculartothevectorveofcombinedspeed・Downmilling:Thevelocityofthecontactpointonthemillingtoolisinthesame