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1、GB1239.5-89.NationalStandardofthePeople’sRepublicofChinaGB1239.5-89SupersedingGB1239-76SamplingProceduresforInspectionbyAttributesofCoiledHelicalSprings1.ContentsandApplicationScopeThisStandardsetsforthsamplingproceduresforinspectionofcoiledhelicalsprings.ThisStandardis
2、applicabletocoldcoiledhelicaltensionsprings,coldcoiledhelicalcompressionsprings,hotcoiledhelicaltensionsprings,hotcoiledhelicalcompressionspringsandcoldcoiledhelicaltorsionsprings(hereinafterreferredtoasSpring).ThisStandardisinapplicabletovalvespringsandhydraulicsprings
3、aswellasspringswhichareusedondieselengineinjectionpump,speedregulatorandfuelinjectorandaresubjecttospecialrequirements.2.NormativeReferenceGB2828SamplingProceduresandTablesforLot-by-lotInspectionbyAttributes(ApplytoInspectionofSuccessiveLotsorBatches)3.DefectDefectmeans
4、thefactthatSpringfailstomeetthetechnicalrequirementasspecifiedinproductstandard,technologicaldocumentorprocessdrawing.Accordingtotheseverity,defectscanbedividedintothefollowingtypes:DefectItemA(criticaldefect);DefectItemB(majordefect);DefectItemC(minordefect).Thedefecti
5、temsofSpringaredetailedinTable1hereof.Table1CategoryofSpringDefectItemADefectItemBDefectItemCColdcoiledhelicalcompressionspringDecarburization,hardnessSpringcharacteristics,outsideorinsidediameter,surfacedefect,permanentdeformationVerticality,totalnumberofcoils,freeheig
6、ht,evennessofpitchColdcoiledhelicaltensionspringSpringcharacteristics,surfacedefectOutsidediameter,freelength,lengthofhookGB1239.5-89ColdcoiledhelicaltorsionspringSpringcharacteristicsordegreeoffreedom,surfacedefectOutsidediameter,freelength,lengthoftorsionarmHotcoiledh
7、elicalcompressionspringDecarburization,hardnessSpringcharacteristics,outsideorinsidediameter,surfacedefect,permanentdeformationVerticality,linearity,freeheight,totalnumberofcoils,uniformityofpitchHotcoiledhelicaltensionspringDecarburization,hardnessSpringcharacteristics
8、,surfacedefect,permanentdeformationOutsidediameter,freelengthNote:Ifnecessary,fatiguelifemaybelistedasDefectIt
