常用抽样检验计划.ppt

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1、常用之抽样计划介绍从MIL-STD105E到MIL-STD-1916前言产业界沿用已久之MIL-STD-105E表，当可被接受的不良率由%等级演变到PPM等级时，此套抽样计划逐渐被取代。汽车业界使用之TS16949规定：计数型的抽样，其接受的等级必须是零缺点。常见以下抽样方式，取代STD-105E表：C=0抽样计划表MIL-STD-1916所提供之抽样计划表MIL-STD-105EMIL-STD-105ETS16949C=0抽样计划某公司两者之OCCurven=200,Ac=3,Re=4n=68,Ac=0,Re=1AQL=0.65STD-105E抽样计划表C=0抽样计划表

2、两者之OCCurveAQL=0.065→n=200,Ac=0,Re=1MIL-STD-1916SCOPEAPPLICABLEDOCUMENTSDEFINITIONSGENERALREQUIREMENTSDETAILEDREQUIREMENTSNOTESMIL-STD-19164.GENERALREQUIREMENTS4-1Acceptancebycontractor-proposedprovisions4-2Acceptancebytable4-3Dispositionofnonconformingproduct4-4Criticalcharacteristics4-5S

3、pecialreservationsforcriticalnonconformingMIL-STD-19164-1Acceptancebycontractor-proposedprovisions4-1-1GeneralRequiresthecontractortoperformsamplinginspectioninaccordancewithparagraph4.2andtheproductspecification.Whenproperproductandprocessdesignandprocesscontrolactivitiesareeffective,sam

4、plinginspectionisaredundanteffortandanunnecessarycost.Contractorsareencouragedtoconsidersubmittingalternateacceptancemethodsforoneormorecharacteristics.4-1-2RequirementsandProceduresContractors’qualitysystemsinaccordingwithMIL-Q-9858enhancedwithSPC,ANSI/ASQCQ9004arequalifiedtoapplyforalte

5、rnateacceptancemethods.ThecurrentminimumvaluesofprocesscapabilityareequivalenttoaCpkof2.00forcriticalcharacteristics,1.33formajorcharacteristics,1.00forminorcharacteristics4-1-3Submissionandincorporation4-1-4WithdrawalofapprovalofalternatesMIL-STD-19164-2Acceptancebytable4-2-1Preferredsam

6、plingplansthisstandardestablishesthreesetsofmatchedsamplingplans,inspectthesamplesfromlotsbyattributesorvariablesmeasurementandforcontinuoussamplingbyattributesmeasurement.thethreesetsareindexedbysevenspecifiedverificationlevels(VL)andfivecodeletters(CL),whicharedeterminedbythelotorproduc

7、tionintervalsize.4-2-2Formationandidentificationoflotsorbatches4-2-3Determinationofsamplingplana.VLasspecified.b.Typeofsampling(attributes,variables,orcontinuous)c.LotsizeCLfromtableId.Switchingprocedure4-2-4SamplingoflotsorbatchesMIL-STD-1916MIL-STD-1916(计数型)MIL-ST