机械制造技术基础双语第1章ppt课件.ppt

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1、北京信息科技大学机电工程学院机械制造技术基础FundamentalsofManufacturingTechnology第1章金属切削原理作者：王红军单位：北京信息科技大学制作时间：2015年3月Chapter1PrinciplesofMetalCutting2021/10/821.1Introduction概述1.1.1MachiningMachiningmeansthatthecuttingtoolisusedtoremoveexcessmaterialsfromtheworkpiecesoastop

2、roducethedesiredsize,shapeandsurfacefinishtothefinishedwork.1.1.2PrinciplesofMetalCuttingItisasciencetostudythebasicrulesinmetalcuttingprocess.Thecuttingregularityanditscontrolmethodscanbefoundsoastoestablishthenecessarytheoreticalfoundationforsolvingsom

3、etechnicalproblemsincuttingprocess.2021/10/831.2Basicknowledgeofmetalcutting1.2.1Cuttingmotionsandmachiningvariables1．CuttingmotionsAsshowninFig.1-1,duringthemetalcuttingprocess,thereisarelativemotionbetweenworkpieceandcuttingtool.Cuttingmotions,accordin

4、gtoitsfunctioninmetalcutting,canbedividedintomainmotionandfeedmotion.Fig.1-1Cuttingmotionsandworkpiecesurface2021/10/841.2Basicknowledgeofmetalcutting1.2.1Cuttingmotionsandmachiningvariables1．Cuttingmotions(1)MainMotion.Mainmotionisbasicmotionrequiredtor

5、emovethesurplusmaterialsfromtheworkpiece.(2)FeedMotion.Feedmotionisthemotionwhichbringsthenewmetalintocuttingprocessconstantlysoastomachinethewholesurfaceofworkpiece.(3)Resultantcuttingmotions.Resultantcuttingmotionsisamotioncomposedbymainmotionandfeedmo

6、tion.2021/10/851.2Basicknowledgeofmetalcutting1.2.1Cuttingmotionsandmachiningvariables2.CuttingvariablesCuttingvariablesconsistofcuttingspeed,feedanddepthofcut,asshowninFig.1-2.Fig.1-2Feedanddepthofcut1.2Basicknowledgeofmetalcutting2021/10/861.2Basicknow

7、ledgeofmetalcutting2021/10/871.2Basicknowledgeofmetalcutting2021/10/881.2Basicknowledgeofmetalcutting1.2.2Geometryofcuttingtools1.ElementsofcuttingtoolTherearemanykindsofmetalcuttingtools,asshowninFig.1-3,suchaslathetool,millingcutter,drill,reamer,etc..2

8、021/10/89Fig.1-3Geometryofcuttingpoint1.2Basicknowledgeofmetalcutting1.2.2Geometryofcuttingtools2.ReferencesystemfordesignatingtoolanglesInordertodeterminethespacepositionofrakeface,flanksandcuttingedges,thereferencesystem