磨料有序排布钎焊金刚石砂轮磨削硬质合金的性能研究_英文_

Mar.2007TransactionsofNanjingUniversityofAeronautics&Astronautics.24No.1Vol

PERFORMANCEOFBRAZEDDIAMONDCUP-TYPE

WHEELSWITHDEFINEDGRAINPATTERN

INGRINDINGCEMENTEDCARBIDE

LiShusheng

1,2

,XuJiuhua1,XiaoBing1,YanMinghua1,FuYucan1,XuHongjun1

(1.CollegeofMechanicalandElectricalEngineering,NUAA,29YudaoStreet,Nanjing,210016,P.R.China;2.DepartmentofMechanical&ElectronicalEngineering,TaizhouPolytechnicCollege,Taizhou,225300,P.R.China)Abstract:Anewcup2typegrindingwheelofthebrazedmonolayerdiamondisdevelopedwithadefinedgrainpat2ternonthewheelsurface.Grindingperformanceofthebrazedwheelinthesurfacegrindingentedcarbideisstudied.Experimentalresultsshowthatwhencontinuousisempbrazeddiamondgrindingwheelfailmainlyinattritiouswearandfracture2conventionalItalloytodiamondgritsandelectroplatedandsintereddiamondwon,goodroughness.Thetheoreticalsurfacethelongerservicelifeof.mKey;wheelgrinding;cementedcarbide;wear

CLCnumTG74+3　　　Documentcode:A　　ArticleID:100521120(2007)0120054205

INTRODUCTION

Conventionaldiamondgrindingwheels,suchasresin2bondedandelectroplateddiamondwheelsarewidelyusedinthemetalworkingindustryforgrindingvariouscementedcarbidetools.

The

highhardness,thetoughness,andtheresistancetoabrasivewearofcementedcarbidesmakethemextremelydifficulttobeground.Thegrainsofconventionaldiamondwheelsareeasytobepulledoutandthewheelsfailtooearlyduringgrindingbecausethegrainsjustbondtothewheelsub2stratethroughlowphysicalincrustationeffectsbetweenthebondinglayerandthegrains

[122]

relativelynewtechniquetofabricatediamond

grindingtools.Manyrecentstudiesshowthatastrongchemicalbondingisformedbetweendia2mondgritsandbrazingalloy

[427]

.Vacuumbrazing

50USmeshdiamondgritmechanismsofthe40

arestudiedandbrazeddiamondtoolsareutilizedinthestoneprocessindustry

[526]

.However,no

furtherresearchesarereportedofthebrazedgrindingtoolswithsmallersizegrains,whichareusedtoacquirehighermachiningprecisionfordif2ficult2to2grindingmaterials.Anewkindofbrazed170diamondcup2typegrindingwheelwith140 USmeshdiamondgritsaredevelopedunderthevacuumconditionwithNi2Cralloyfillerinthispaper.

Anewwayofproducingabrazeddiamondgrindingwheelispresentedwithgrainsarrangedinacontrolledwayandgrindingperformanceofthebrazedcup2typewheelisstudiedforacement2.edcarbidematerial

.

Whencontinuousdrygrindingoverthecementedcarbideisemployedwithresin2bondeddiamondwheels,

theresultingwearabrasivesmakea

[3]

greaterproportionofparticlestobepulledout,therebydecreasingthegrindingperformance.Brazingofdiamondgritsonsteelsubstratesisa

　Foundationitems:SupportedbyAeronauticalScienceFoundationofChina(05H52060);theNaturalScienceFounda2

tionofJiangsuProvince(BK2006723).　Receiveddate:2006-04-11;revisionreceiveddate:2006-08-24　E-mail:ssli1972@163.com