刀具基础技术培训04

与机床相关的问题,振动解决方法检查刀具及工件的夹紧增大进给增大切削速度，同时减少进给减少切削速度,机床停转扭距过大的解决方法减少进给选择更锋利的刀片几何槽型预钻小孔，然后用扩孔刀扩孔机床功率不够的解决方法减少切削速度减少进给选择更锋利的刀片几何槽型预钻小孔，然后用扩孔刀扩孔,钻出通孔,对于钻通孔而言，在孔被钻穿之前，将在孔底形成一个圆盘，此圆盘一直受到钻头向外的一个推力。因此在车间上，必须预先采用措施来避免此圆盘飞出打伤机床，对于升放式机床，必须采用保护措施。根据工件材料不同，在钻通孔时，工件有变形或损坏的可能性。,在进给太大时，对于铸件来讲，在孔底部此圆盘会断裂飞出。可通过降低进给的方法减少其影响。,对于韧性工件来讲，在孔壁将产生大量毛刺，通过降低进给和选用更锋利刀片可减少此趋势。,夹紧,稳固的装夹是取得好的加工质量的孔及刀具寿命的失决条件。薄壁件更需要好的支撑和夹紧，因为切削力将使工件弯曲变形而且刀片在钻出工件时，切削刃会损伤。,层叠工件钻加工,加工层叠工件，浅孔钻不合适，因为在孔底会出现一个圆盘无法消除。,断续切削,一般情况下，浅孔钻钻入和钻出的表面都是预加工过的，如在毛坯面上钻孔，须减小进给。对于进给减少到何种程度须按实际情况而定（未完全切入之前）如表面斜度在5以下，无须降低。大于5须减少30%-50%左右。钻链式孔或严重断续切削，须减小50%左右。钻相对端面时，也须减少50%左右。,钻入贯通孔,钻相对端面孔,斜面钻入与钻出,钻链式孔和断续切削,丝锥使用指南,T2-011-0011-E-p,Plugtapwithshorttaper(1to3threadlead),Secondtapwithaveragetaperlength(3to5threadlead),Tapertapwithlongtaperlength(7to10threadlead),Nutthreadwithextralongtaper(12to16threadlead),Threadformer(withoutflutes),Flutelesstapwithlongspiralpointwithoutswarforlubricantflutes(foruseonthinsheetmetal),ThreadFormersandTapsCharacteristicsoftheLeadAngle,TapGeometry,1)Rakeangle2)Chamferreliefangle3)Lead/chamferangle4)Spiralpointangle5)Eccentricreliefangle6)Threadrelief7)Pitch8)Widthofland,T3-028-0101-E-p,RakeAngleonTaps,T3-016-0101-E-p,Tapgeometry-spiralpoint/rakeangle,Type21(AL),Type17(N),Type47(Ti),Decreasingrakeanglebyincreasingstability,B9_044_E.ppt,TapsTheGeometry,T2-018-0011-E-p,FluteDesign:-Thefluteform,especiallytherakeangleinfluencesthechip-formationwhenworkingindifferentmaterials.,DifferentTypesofRelief,T3-017-0101-E-p,Tap-backtaper,backtapertaperedpitch-diametere.g.1:1.000on10mmlength0,01mm,Thread-reliefs,profile-relief-outsidediameter-P.D.pitch-diameter-minordia,eccentricrelief-P.D.pitch-diameter-minordia,no-eccentricrelief,T2-017-0011-E-p,0.007mm(.0003“),1mm(.04“),0.003mm(.0001“),1mm(.04“),TapsTheGeometry,Thelead/chamfer,T3-029-0101-E-p,Formofchamfer,6-8numberofthreads,3,5-5numberofthreads,2-3numberofthreads,3,5-5numberofthreads,1,5-2numberofthreads,B9_034_E.ppt,Leads/chamfers,T3-030-0101-E-p,Chipcross-sectionsatdifferentlengthsofchamfer,T3-045-0101-E-p,T2-015-0011-E-p,TapsTheGeometry,T2-019-0011-E-p,TapsTheGeometry,T2-016-0011-E-p,TapsTheGeometry,T2-013-0011-E-p,Tapwithpilot,Tapwithinternal(female)centre,Tapwithexternal(male)centre,Tapwithexternal(male)centrecombinedwithshoulder,ThreadFormersandTaps,T2-021-0011-E-p,Numberofholes,TapsInfluenceofchamferlength,Nomenclature,T3-020-0101-E-p,Straightflute,Spiralflute,Straightflutewithspiralpoint,BasicTapTypes,B9_048_E.ppt,ApplicationAreas,Blindholeinshortchippingmaterials,Throughholeinawiderangeofmaterials,Blindholeinlongchippingmaterials,Throughholeinlongchippingmaterials,T3-035-0101-E-p,ResultingForcesinTapping.,Fc=Fr,Fr,Fa,Fc,Fr,Fa,Fc,B9_128_E.ppt,Tappingofblindholethreads,Reasonsforinaccuratethreads,T3-046-0101-E-p,insufficientalignment,axialcompressionordecompression,unsuitablegeometry(wrongtap),Threadforming-thefastandeconomicalalternative.,B9_170_E.ppt,Developmentofthreadprofileatstartofathreadformingoperation.,B9_171_E.ppt,ThreadFormingTheMethod,B9_172_E.ppt,ThreadForming(ColdForming)Design,B9_173_E.ppt,ThreadFormingGrainStructure,Grainstructurewhenthreadforming,Grainstructurewhenconventionaltapping,B9_174_E.ppt,Influenceofthepre-drilledholeontheformedthread.,B9_178_E.ppt,Fewertoolsrequired=lesscosts,Oneformertapcanreplaceseveralspecialisedapplicationtapsandcanbeusedforblindandthroughholes.,Reducedcostsasfewertoolsarerequired!,Differenttapsfor,B9_181_E.ppt,ThreadFormingThePre-Conditions,B9_182_E.ppt,WithoutLubrication-grooves:Thinfilmoflubricantwhichcanbeinsufficientattheendofdeeperthrea