A study on wear mechanism and wear reduction strategies

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1、Wear254(2003)12471255AstudyonwearmechanismandwearreductionstrategiesingrindingwheelsusedforELIDgrindingK.Fathima,A.SenthilKumar∗,M.Rahman,H.S.LimDepartmentofMechanicalEngineering,NationalUniversityofSingapore,Singapore119260,SingaporeReceived7August2002;receivedinrevisedf

2、orm10March2003;accepted1June2003AbstractMetal-bondedsuperabrasivediamondgrindingwheelshavesuperiorqualitiessuchashighbondstrength,highstabilityandhighgrind-ability.Themajorproblemsencounteredarewheelloadingandglazing,whichimpedestheeffectivenessofthegrindingwheel.Electrol

3、yticin-processdressing(ELID)isaneffectivemethodtodressthegrindingwheelduringgrinding.Thewearmechanismofmetal-bondedgrind-ingwheelsdressedusingELIDisdifferentformtheconventionalgrindingmethodsbecausethebondstrengthofthewheel-workingsurfaceisreducedbyelectrolysis.Thereducti

4、onofbondstrengthreducesthegrit-depth-of-cutandhencethesurfacefinishisimproved.Theoxidelayerformedonthesurfaceofthegrindingwheelexperiencesmacrofractureattheendofwheellifewhilemachininghardandbrittlework-pieces.Whenthewheelwearisdominatedbymacrofracture,thewheel-workingsurf

5、aceisfreefromloadedchipsandworndiamondgrits.Whentheoxidelayerisremovedfromthewheelsurface,theelectricalconductivityofthegrindingwheelincreases,andthatstimulateselec-trolyticdressing.Theconditionsappliedtothepulsecurrentinfluencetheamountoflayeroxidizingfromthegrindingwheel

6、surface.Longerpulseontimeincreasesthewheelwear.Shorterpulseontimecanbeselectedforacoursergritsizewheelsincethattypeofwheelneedshighgrindingefficiency.Equalpulseonandofftimeisdesiredforfinergritsizewheelstoobtainstableandultraprecisionsurfacefinish.©2003ElsevierScienceB.V.All

7、rightsreserved.Keywords:ELID;Metal-bondedgrindingwheel;Macrofracture;Grindingwheelwear1.IntroductionWheelwearisanextremelycomplexprocess,whichin-volvestheculminationofnumerousweareventsencoun-Metal-bondedsuperabrasivegrindingwheelsarewidelyteredbetweenmanysinglegritsandth

8、eworkpiece.Theusedtoestablishamirrorsurfacefinishonhardandbrittleconventionalwayofquantifyingwhee