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1、中北大学学位论文PredictionofMicro-cuttingandtheStudyBasedonSimulationAbstractMicro-cuttingtechnologybelongtoMEMSpartsmachining,withawiderangeofprocessingmaterials,lowcost,highprecisionmachining.Thesmallsize,thestrengthandthestiffnessoftheworkpieceisnotallowedtousethebigbackofcutandfeedra
2、te.Classiccuttingtheoryexpoundedbythecuttingelementsoncuttingdoesnotapplytomicro-cutting.Tomicro-cuttingprocessinthemechanismofchipformation,cuttingforcevariationanditsimpactfactorsforbasicresearch,focusingonthefollowingaspectswerestudied.1.Inthispaper,Micro-Cuttingforcestemsfocu
3、sesmainlyonthreesections，oneareshearflowstressandtensileflowstress,whichstemfromelasticdeformationandplasticdeformationoftoolandworkpieces,thesecondarethefrictionbetweentoolrakefaceandchip,andthethirdisploughingbetweentoolflankandmachinedsurface.Thecalculationofderivationformulas
4、willbeestablishedbythreesections,whichincludeshearflowstress,tensileflowstress,andthefrictionforceofrakesurface.2.ThesimulationoforthogonalturningexperimentsusedadventedgeFEMsoftware,workpieceisASTM1045byAmericanStandard(Equivalentto45steel).TheresultsshowthatMain-cuttingforceisg
5、reaterthanthefeedforce.ThereisnoinfluenceofcuttingspeedonCuttingForces.Becauseofreducingthestraingradienteffectinmicro-cuttingprocess,thebiggerthefeed,thesmallertherateofcuttingforce.Thegrowthprocessofcuttingforceisgeneticallyclosertolinearprocessthanfeedforce.3.Usingthedataofthe
6、practicemicro-cutting,thepaperverifythepredictedtheoreticalformula.Foundthatthecuttingspeedaffecttheactualrakeangleandshearangle,whichultimatelyacertaininfluenceonthecuttingforce.4.ThesimulationofturningexperimentsusedadventedgeFEMandABAQUSsoftware,II中北大学学位论文comparedthedifferentb
7、etweenmicro-cuttingandcutting.Differentfromconventionalcutting,inmicro-cuttingthemaximumtemperatureofworkpieceislocatedonprimarydeformationzone,andthetooltipisthemaximumtemperaturezone,too.Keywords:Micro-cutting,Straingradient,Cuttingedgeradius,CuttingregiemsIII中北大学学位论文目录第1章绪论...
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