在高速潮湿机械加工条件下后刀面表层磨损机理.doc

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1、蹿伏戚澧褐庭蘑速烨谩遢撸贬焱颦睫袅弯逼氢CHAPTERV苋拚鲁跋野浓寇涸佾刺TOOLWEARMECHANISMSONTHEFLANKSURFACEOFCUTTINGINSERTSFORHIGHSPEEDWETMACHINING噱砥颍裙呵厣斑逦啉系5.1Introduction攮鳢煤蠃存衲敲载趁狭Almosteverytypeofmachiningsuchasturning,milling,drilling,grinding...,usesacuttingfluidtoassistinthecosteffectiveproductionof

2、partsassetupstandardrequiredbytheproducer[1].Usingcoolantwithsomecuttingtoolsmaterialcausesseverefailureduetothelackoftheirresistancetothermalshock(likeAL2O3ceramics),usedtoturnsteel.Othercuttingtoolsmaterialslikecubicboronnitride(CBN)canbeusedwithoutcoolant,duetothetypeo

3、ftheirfunction.TheaimofusingCBNistoraisethetemperatureoftheworkpicetohighsoitlocallysoftensandcanbeeasilymachined.Thereasonsbehindusingcuttingfluidscanbesummarizedasfollows.疠港希沈帛梢鸵抿郜纬®Extendingthecuttingtoollifeachievedbyreducingheatgeneratedandasaresultlesswearrateisachi

4、eved.Itwillalsoeliminatetheheatfromtheshearzoneandtheformedchips.诟缉侵描徙飞嗒碘捣犊®Coolingtheworkpieceofhighqualitymaterialunderoperationplaysanimportantrolesincethermaldistortionofthesurfaceandsubsurfacedamageisaresultofexcessiveheatthatmustbeeliminatedorlargelyreducedtoproduce

5、ahighqualityproduct.貉叉穿猸竞岣菘雅尴氍Reducingcuttingforcesbyitslubricatingeffectatthecontactinterfaceregionandwashingandcleaningthecuttingregionduringmachiningfromsmallchips.Thetwomainreasonsforusingcuttingfluidsarecoolingandlubrication.陛翠汀溯羁华宠挚讨洹CuttingFluidasaCoolant:秤赠爿裁饿骷凫瞵觎

6、动Thefluidcharacteristicsandconditionofusedeterminethecoolantactionofthecuttingfluid,whichimprovestheheattransferattheshearzonebetweenthecuttingedge,workpiece,andcuttingfluid.Thepropertiesofthecoolantinthiscasemustincludeahighheatcapacitytocarryawayheatandgoodthermalconduc

7、tivitytoabsorbtheheatfromthecuttingregion.Thewater-basedcoolantemulsionwithitsexcellenthighheatcapacityisabletoreducetoolwear[44].排绰飒酶喻稍实挝敝挹CuttingFluidasaLubricant:箕来趟沫红唪御哓巅饱Thepurposeistoreducefrictionbetweenthecuttingedge,rakefaceandtheworkpiecematerialorreducingthecut

8、tingforces(tangentialcomponent).Asthefrictiondropstheheatgeneratedis廷枪馋鸩艉煤凄焱趔包dropped.Asaresult,