grinding wheel

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1、GrindingWheelGrindingBondPorositywheelGrainBondfractureMicrocracksGrainfractureWorkpieceAttritiouswearWheelsurfaceFIGURE9.1Schematicillustrationofaphysicalmodelofagrindingwheel,showingitsstructureandgrainwearandfracturepatterns.Commonglass350-500Titaniumnitride2000Flint,quartz8

2、00-1100Titaniumcarbide1800-3200Zirconiumoxide1000Siliconcarbide2100-3000Hardenedsteels700-1300Boroncarbide2800Tungstencarbide1800-2400Cubicboronnitride4000-5000TABLE9.1Knoophardnessrangeforvariousmaterialsandabrasives.Aluminumoxide2000-3000Diamond7000-8000ManufacturingProcesses

3、forEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7GrindingWheelTypesGrindingfaceGrindingface(a)Type1—straight(b)Type2—cylinderGrindingfaceGrindingface(c)Type6—straightcup(d)Type11—flaringcupGrindingfacesGrindingfaces(e)Type27—depressedcent

4、er(f)Type28—depressedcenterFIGURE9.2Somecommontypesofgrindingwheelsmadewithconventionalabrasives(aluminumoxideandsiliconcarbide).Notethateachwheelhasaspecificgrindingface;grindingonothersurfacesisimproperandunsafe.(g)MountedManufacturingProcessesforEngineeringMaterials,5thed.Kal

5、pakjian•Schmid©2008,PearsonEducationISBNNo.0-13-227271-7SuperabrasiveWheelsType1A12A21A1RSS(a)(b)(c)11A2DWDWSE(d)(e)(f)FIGURE9.3Examplesofsuperabrasivewheelconfigurations.Therimconsistsofsuperabrasivesandthewheelitself(core)isgenerallymadeofmetalorcomposites.Notethatthebasicnumb

6、eringofwheeltypes(suchas1,2,and11)isthesameasthatshowninFig.9.2.Thebondingmaterialsforthesuperabrasivesare:(a),(d),and(e)resinoid,metal,orvitrified;(b)metal;(c)vitrified;and(f)resinoid.ManufacturingProcessesforEngineeringMaterials,5thed.Kalpakjian•Schmid©2008,PearsonEducationISBN

7、No.0-13-227271-7GrindingWheelMarkingSystemExample:51–A–36–L–5–V–23PrefixAbrasiveAbrasiveGradeStructureBondManufacturer!stypegrainsizetyperecordManufacturer!ssymbolCoarseMediumFineVeryDense1Manufacturer!s(indicatingexactfine2privatemarkingtypeofabrasive)830702203(toidentifywheel

8、)(useoptional)(useoptional)103680240412469028051454100