mprocesses notes 8 - copy

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Abrasive Machining Abrasive Machiningand Finishingand Finishing

ManufacturingManufacturingProcessesProcesses



OutlineOutline

UnitsUnits Abrasives Abrasives

GrindingGrindingGrinding WheelsGrinding WheelsGrinding ProcessGrinding Process

Coated AbrasivesCoated AbrasivesBelt GrindingBelt GrindingHoningHoningLappingLappingOther Finishing OperationsOther Finishing Operationseburring Processeseburring Processes



Abrasive Machining Abrasive Machining




Why a smooth surface?Why a smooth surface?




Why a smooth surface?Why a smooth surface?

!eduction in Friction!eduction in FrictionHeat " BearingsHeat " Bearings

!eduction in Wear !eduction in Wear Bushings#BearingsBushings#Bearings

Appearance AppearanceCar Bod$% FurnitureCar Bod$% Furniture

ClearanceClearance

is& Headis& Head

'harpness'harpnessCutting (oolsCutting (ools




How do we get a smoothHow do we get a smooth

surface?surface?




How do we get a smoothHow do we get a smooth

surface?surface?

!e)ove Material!e)ove Material Abrasive Machining Abrasive Machining

FlattenFlattenBurnishingBurnishing

Fill in *oidsFill in *oids Add )aterial Add )aterial

PaintPaint

FinishFinishWa+Wa+



UnitsUnits

Meter ,)-Meter ,)-Centi)eter ,c)-Centi)eter ,c)- .. /01 )/01 )

Milli)eter ,))-Milli)eter ,))- .. /001 )/001 )Micro)eter ,2)-Micro)eter ,2)- .. 1010"3"3 ))4ano)eter ,n)-4ano)eter ,n)- .. 1010"5"5 )) Angstro) ,6- Angstro) ,6- .. 1010"10"10 ))



UnitsUnits

17897000 ) )eter

10"7 centi)eter

10"3 )icro)eter

10"5 nano)eter

10"10 angstro)



Abrasives Abrasives

Abrasives Abrasives')all% hard non)etallic')all% hard non)etallic

particles :ith sharp edges andparticles :ith sharp edges andirregular shapesirregular shapes

Can re)ove s)all a)ounts ofCan re)ove s)all a)ounts of)aterial% producing tin$ chips)aterial% producing tin$ chips

Abrasive processes can Abrasive processes can

produce fine surface finishesproduce fine surface finishesand accurate di)ensionaland accurate di)ensionaltolerancestolerances



($pes of ($pes of

Abrasives AbrasivesConventional AbrasivesConventional Abrasives

a/ Alu)inu) o+ide ,Ala/ Alu)inu) o+ide ,Al77OO;;--

b/ 'ilicon carbide ,'iC-b/ 'ilicon carbide ,'iC-

'uperabrasives'uperabrasivesc/ Cubic Boron 4itride ,cB4-c/ Cubic Boron 4itride ,cB4-d/ ia)ondd/ ia)ond

Abrasives are harder than Abrasives are harder thanconventional tool )aterialsconventional tool )aterials



Abrasive Factors Abrasive Factors

" Grain si<eGrain si<e" Grain shapeGrain shape" HardnessHardness" Friabilit$ ,tendenc$ to fracture-Friabilit$ ,tendenc$ to fracture-



Abrasive Hardness and Abrasive Hardness and

(her)al Conductivit$(her)al Conductivit$



GrindingGrinding



=+a)ple of a=+a)ple of a

Grinding MachineGrinding Machine



($pes of Grinding($pes of Grinding

" 'urface Grinding'urface Grinding" C$lindrical GrindingC$lindrical Grinding" >nternal Grinding>nternal Grinding" Centerless GrindingCenterless Grinding" OthersOthers

" (ool and cutter grinders(ool and cutter grinders" (ool"post grinding(ool"post grinding" ':ing"fra)e grinders':ing"fra)e grinders

" Bench grindersBench grinders" Creep"Feed GrindingCreep"Feed Grinding

mprocesses notes 8 - copy

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