Selectionofturningtoolsforcladding/thermalspraying materials
Thermalsprayweldingandcladdingweldingarebothtechnologies usedtostrengthenandrepairthesurfaceofmaterials.Thermal sprayweldingisatechnologythatusesahigh-temperatureheat sourcetospraymoltenorsemi-moltenmaterialontothesurfaceof theworkpiecetoformacoating.Commonheatsourcesinclude flame,arc,plasma,etc.,whilecladdingweldingisatechnologythat usesaweldingmethodtomeltthefillermaterialontothesurfaceof thesubstratetoformacladdinglayer.Commoncladdingmethods includearcwelding,plasmaarcwelding,laserwelding,etc. Commonapplicationscopesofthermalspraywelding/cladding weldingincludelargeballvalves,lasercladdingmolds,rollers, heavycylinderpistons,etc
Thesurfacehardnessoftheworkpieceafterthermal spraying/surfacingishigh,andthesurfaceoftheworkpieceafter surfacingisnotveryregular,whichplaceshighrequirementsonthe
hightemperatureredhardnessandimpacttoughnessoftheinserts.
Inthisregard,HalnnSuperhardcanprovidethreetypesofinserts materials:carbideinserts,ceramicinsertsandCBNinsertsfor processingdifferentmaterials. Basedonyearsofpracticalexperience,HalnnSuperhardhas concludedthatmoresuitableinsertsmaterialscanbeselected throughthefollowingthreeaspects.
1.Thehardnessoftheinsertsitselfandthehardnessofthe materialbeingprocessed:Thehardnessoftheinsertsmustbe greaterthanthehardnessofthematerialbeingprocessed.Interms oftheirownhardness,carbideinserts,ceramicinsertsandCBN insertsare:carbideinserts<ceramicinserts<CBNinserts.
2Hightemperatureresistanceofinsertsandcuttingtemperature ofprocessedmaterials:Thehightemperatureresistanceofinserts mustbegreaterthanthecuttingtemperatureofprocessed materialsIntermsoftheirownhightemperatureresistance,the threetypesofinsertsare:carbideinserts<ceramicinserts<CBN inserts.
3.Impacttoughnessofinsertsandworkingconditionsand processingsurfacemorphology:Forexample,thesurfaceofthe workpiecerepairedbysurfacingmaterialsisirregular,uneven,and hashighhardness,formingintermittentcutting,whichhashigh
requirementsfortheimpacttoughnessofinserts.Intermsoftheir ownimpacttoughness,thethreetypesofinsertsare:ceramic inserts<CBNinserts<carbideinserts.
ThefollowingisasuccessfulcasestudyofHalnnSuperhard insertsprocessingthermalspraywelding/surfacingmaterialsfor reference. (1)CaseparametersofHalnnSuperhardinsertsprocessingspray weldingballvalve
Technicaldifficulties:
1.ThehardnessofthesurfaceaftersprayweldingisHRC55-60, andthesprayweldingsurfaceisirregular,sotheinsertsneedsto havenotonlyhighhardness,butalsoacertainimpacttoughness.
2.ConventionalCBNbladeswithnegativechamferscannotbe usedduringcutting,otherwisethesurfacesprayweldinglayerwill bepeeledoff.
Machineinserts:CNCverticallathe
Processingobject:Surfacesprayweldingofni55,Ni60
nickel-basedalloy
Hardness:HRC55;HRC60
Processingcontent:Sprayweldinglayerthickness:1.6mm,retain 0.6mmthickness,andremove1mmthicknessduringprocessing.
Basedonthisworkingcondition,Halnnprovidedanoriginal solution:BN-H10materialchipbreakerinsert,whichnotonly solvedthecustomer'sprocessingdifficulties,butalsoimproved workefficiencyandwaswellreceivedbycustomers.
BelowisthesceneofHalnn'ssuper-hardcarbideinsertsturning weldedparts.Thecustomerisverysatisfiedwiththeinsertsresults.
Conclusion:Theselectionofsuitableinsertsmaterialsneedstobe
basedonthespecificprocessinghardnessandmaterialtoughness, andthehightemperatureresistanceandimpactresistanceofthe insertsshouldbecomprehensivelyconsideredinordertobetter achievethebestprocessingeffectandinsertslife.