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7/23/2019 MProcesses Notes 8 - Copy
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Abrasive Machining Abrasive Machiningand Finishingand Finishing
ManufacturingManufacturingProcessesProcesses
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OutlineOutline
UnitsUnits Abrasives Abrasives
GrindingGrindingGrinding WheelsGrinding WheelsGrinding ProcessGrinding Process
Coated AbrasivesCoated AbrasivesBelt GrindingBelt GrindingHoningHoningLappingLappingOther Finishing OperationsOther Finishing Operationseburring Processeseburring Processes
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Abrasive Machining Abrasive Machining
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Abrasive Machining Abrasive Machining
Why a smooth surface?Why a smooth surface?
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Abrasive Machining Abrasive Machining
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
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Abrasive Machining Abrasive Machining
How do we get a smoothHow do we get a smooth
surface?surface?
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Abrasive Machining Abrasive Machining
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+
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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 ))
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UnitsUnits
17897000 ) )eter
10"7 centi)eter
10"3 )icro)eter
10"5 nano)eter
10"10 angstro)
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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
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($pes of ($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
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Abrasive Factors Abrasive Factors
" Grain si<eGrain si<e" Grain shapeGrain shape" HardnessHardness" Friabilit$ ,tendenc$ to fracture-Friabilit$ ,tendenc$ to fracture-
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Abrasive Hardness and Abrasive Hardness and
(her)al Conductivit$(her)al Conductivit$
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GrindingGrinding
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=+a)ple of a=+a)ple of a
Grinding MachineGrinding Machine
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($pes of Grinding($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