SKF 热处理标准

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1、Code:1.381.165SUBCONTRACTEDHEATTREATMENTSPECIFICATIONGTD,GMCSt-CyrIssueNr:2Date:10/07/2013THROUGHMARTENSITICHARDENINGMaterials&TreatmentsANDTEMPERINGOFDGBBRINGSCompiledApprovedSpecificationsCBCDSection1Edition:07/20131.OBJECTIVEThisspecificationisageneralqualitystandardforDee

2、pGrooveBallBearing(DGBB)ringsinthemartensiticthroughhardenedandtemperedconditionsasdeliveredforgrindingandfinishing.Thisspecificationcoversproductrequirementsandgivesreferencestotestingstandardsand/ortestingmethodstobeused.Thesubcontractorshallberesponsibleforperformingthenec

3、essaryteststoensuretheprocessconditionsandproductqualitystandardsrequiredbythisspecificationaremet.Thetestandcontrolroutines,administrationanddocumentationshallfollowrecommendationbyinternationalorganisationsandSKF.AlldeviationsfromthisspecificationmustbeapprovedbySKF.2.APPLI

4、CATIONFIELDAlltheDGBBringsmadeofbearingsteelgrade(e.g.SKF3,SKF3S…orequivalent)whichdrawingreferstothisspecification.3.METALLURGICALREQUIREMENTSAFTERHEATTREATMENT3.1Hardness3.1.1SurfacehardnessasmeasuredontheringsfaceThemethodtobeusedforthesurfacehardnessmeasurementsisHRC(Rock

5、wellC)accordingtoISO6508/1standardrequirementsinforce.TheHRCsurfacehardnessshallbemeasuredontheringsfaceafterslightgrindingtoremovetheheattreatmentoxidation.IfitisnotpossibletoapplyRockwellChardnessmeasurements(facewidthnotenoughlarge),HV10method(VickersLoad10kg)shallbeapplie

6、daccordingtoISO6507/1standardwithanappropriatedsurfacepreparation(polishing).TheHRCorHV10surfacehardnessresultsshallbewithinthelimitsgiveninthefollowingtableaccordingtothebearingringstabilisation:(1)BearingringstabilisationHardnessHRCHardnessHV10SN62-65735-820TemperedS0060-64

7、690-790S058-62645-735StabilisedS157-61625-715S256-59605-665(1)AccordingtoSKFS&PD30page252.4:Hardnesstestingmethodsformetallicmaterials.3.1.2SurfacetracklayerhardnessThesurfacetracklayerisconsideredtobe3mmdeepfromtheringracewaygroovesurface.Themethodtobeusedforhardnessmeasurem

8、entsisHV10(VickersLoad10kg)accordingtoISO6507/1standardinforce.TheHV