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1、GrindingWheelFIGURE9.1Schematicillustrationofaphysicalmodelofagrindingwheel,showingitsstructureandgrainwearandfracturepatterns.TABLE9.1Knoophardnessrangeforvariousmaterialsandabrasives.ManufacturingProcessesforEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISB
2、NNo.0-13-227271-7GrindingWheelTypesFIGURE9.2Somecommontypesofgrindingwheelsmadewithconventionalabrasives(aluminumoxideandsiliconcarbide).Notethateachwheelhasaspecificgrindingface;grindingonothersurfacesisimproperandunsafe.ManufacturingProcessesforEngineeringMaterials,5thed.Kalpa
3、kjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7SuperabrasiveWheelsFIGURE9.3Examplesofsuperabrasivewheelconfigurations.Therimconsistsofsuperabrasivesandthewheelitself(core)isgenerallymadeofmetalorcomposites.Notethatthebasicnumberingofwheeltypes(suchas1,2,and11)isthesameast
4、hatshowninFig.9.2.Thebondingmaterialsforthesuperabrasivesare:(a),(d),and(e)resinoid,metal,orvitrified;(b)metal;(c)vitrified;and(f)resinoid.ManufacturingProcessesforEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7GrindingWheelMarkingSystemFIG
5、URE9.4Standardmarkingsystemforaluminum-oxideandsilicon-carbidebondedabrasivManufacturingProcessesforEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7DiamondandcBNMarkingSystemFIGURE9.5Standardmarkingsystemfordiamondandcubic-boron-nitridebonde
6、dabrasiveManufacturingProcessesforEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7AbrasiveGrainsFIGURE9.6Thegrindingsurfaceofanabrasivewheel(A46-J8V),FIGURE9.7(a)Grindingchipbeingproducedbyashowinggrains,porosity,wearflatssingleabrasivegrain
7、.Notethelargenegativerakeangleongrains(seealsoFig.9.7b),andofthegrain.Source:AfterM.E.Merchant.(b)metalchipsfromtheworkpieceSchematicillustrationofchipformationbyanabrasiveadheringtothegrains.Notethegrain.Notethenegativerakeangle,thesmallshearrandomdistributionandshapeoftheangle
8、,andthewearflatonthegrain.abrasivegrains.Manufa
