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1、33TOOLWEARMECHANISMSONTHEFLANKSURFACEOFCUTTINGINSERTSFORHIGHSPEEDWETMACHINING5.1IntroductionAlmosteverytypeofmachiningsuchasturning,milling,drilling,grinding...,usesacuttingfluidtoassistinthecosteffectiveproductionofpartsassetupstandardrequiredbytheproducer[1].Us
2、ingcoolantwithsomecuttingtoolsmaterialcausesseverefailureduetothelackoftheirresistancetothermalshock(likeAL2O3ceramics),usedtoturnsteel.Othercuttingtoolsmaterialslikecubicboronnitride(CBN)canbeusedwithoutcoolant,duetothetypeoftheirfunction.TheaimofusingCBNistorai
3、sethetemperatureoftheworkpicetohighsoitlocallysoftensandcanbeeasilymachined.Thereasonsbehindusingcuttingfluidscanbesummarizedasfollows.?Extendingthecuttingtoollifeachievedbyreducingheatgeneratedandasaresultlesswearrateisachieved.Itwillalsoeliminatetheheatfromthes
4、hearzoneandtheformedchips.?Coolingtheworkpieceofhighqualitymaterialunderoperationplaysanimportantrolesincethermaldistortionofthesurfaceandsubsurfacedamageisaresultofexcessiveheatthatmustbeeliminatedorlargelyreducedtoproduceahighqualityproduct.Reducingcuttingforce
5、sbyitslubricatingeffectatthecontactinterfaceregionandwashingandcleaningthecuttingregionduringmachiningfromsmallchips.Thetwomainreasonsforusingcuttingfluidsarecoolingandlubrication.CuttingFluidasaCoolant:Thefluidcharacteristicsandconditionofusedeterminethecoolanta
6、ctionofthecuttingfluid,whichimprovestheheattransferattheshearzonebetweenthecuttingedge,workpiece,andcuttingfluid.Thepropertiesofthecoolantinthiscasemustincludeahighheatcapacitytocarryawayheatandgoodthermalconductivitytoabsorbtheheatfromthecuttingregion.Thewater-b
7、asedcoolantemulsionwithitsexcellenthighheatcapacityisabletoreducetoolwear[44].CuttingFluidasaLubricant:Thepurposeistoreducefrictionbetweenthecuttingedge,rakefaceandtheworkpiecematerialorreducingthecuttingforces(tangentialcomponent).Asthefrictiondropstheheatgenera
8、tedisdropped.Asaresult,thecuttingtoolwearrateisreducedandthesurfacefinishisimproved.CuttingFluidProperties3333FreeofperceivableodorPreserveclaritythroughoutlif
