机械制造技术基础课件-chapter4-section3new.pptx
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1、4.3HolemakingmachinetoolandcuttingtoolDrilling machine (钻床钻床)Boring machine (镗床镗床)Broaching machine (拉床拉床)UsuallyusedholemakingmachinetoolsUsuallyusedholemakingcuttingtoolsTwistdrill(麻花钻)and“massesdrill”(群钻)Coredrill(扩孔钻)Reamer(铰刀)Boringcutter(镗刀)Broachingcutter(拉刀)4.3.1 Drilling machines Drillingma
2、chinesandboringmachinescanbothenlargeandfinishcuttingofholesfromasmallfractionofamillimetretohundredsofmillimetresindiameter.Drillingmachinesareusedforroughdrillingholes.Maintypes: Vertical(立式)、Radial(摇臂)、Deepholedrills(深孔).ThepictureshowsatypicalVerticalDrillingmachines.worktableBaseTheheadstockcol
3、umn主轴箱立柱工作台底座RadialdrillpressMethods of Machining operationsFig 3.29扩孔鍃孔铰孔深孔钻4.3.1 Drilling machines 4.3.2 Boring machine Boringistheoperationthatenlargesapre-existedinternalhole.Severalmachineshavebeendevelopedthatarespeciallyadaptedtoboringwork.Maintypesofboringmachines:Horizontalboringmachine、Jig
4、boringmachinesandhighaccurateboringmachine鞍形工作台镗钻铣头镗杆支撑轴承Boringmachine(镗床)Performance:bigsize,highaccurate,differentsurfaces,highaccuraterelativeposition.Main motion: rotationoftheboringcutterfeed motion: cutterorworkpieceJig boring machine (坐标镗床):Veryhighaccurateposition.positionaccuracyisbetween0.
5、0020.01mmDiamond boring machine diamondboringcuttersused.Jobsdonebyhorizontalboringmachine MethodofHorizontalboringmachineoperations4.3.3 Drilling tools(1) Twist drillTip angleformed by two planes parallelwiththetwomaincuttingedgesChisel edgecenter edge linking the twomaincuttingedgesThemaingeometry
6、fortwistdrillare:thehelicalangle(2430)螺旋角,thetipangle2(118130)锋角,rakeangle前角,reliefangle后角andChiseledgeangle横刃斜角Lipreliefangle钻缘后角Cuttingperformances affectedbygeometryHelicalangle:itistheaxialrakeangle, f for standard twist drill =18 30。drill bronze or soft copper:=10 17 light alloy, red copper: =3
7、5 40 high strength steel, cast iron =10 15AxialforceandmomentCuttingeasyStrengthandheatoffToollifeTipangleCuttingedgelengthUnitcuttingedgeforceandaxialforceTipstrengthTwistmomentHeatoffToollife1 Ordinary Twist drills(麻花钻)麻花钻)Themaingeometryfortwistdrillare:thehelicalangle(2430),thetipangle2(118130),
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