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-105E,MIL-STD-105E,TS16949,C=0 抽样计划,某公司,两者之OC Curve,n=200, Ac=3, Re=4,n=68, Ac=0, Re=1,AQL=0.65,STD-105E抽样计划表,
2、C=0抽样计划表,两者之OC Curve,AQL=0.065 n=200, Ac=0, Re=1,MIL-STD-1916,SCOPEAPPLICABLE DOCUMENTSDEFINITIONSGENERAL REQUIREMENTSDETAILED REQUIREMENTSNOTES,MIL-STD-1916,4. GENERAL REQUIREMENTS4-1 Acceptance by contractor-proposed provisions4-2 Acceptance by table4-3 Disposition of nonconforming product4-4 Crit
3、ical characteristics4-5 Special reservations for critical nonconforming,MIL-STD-1916,4-1 Acceptance by contractor-proposed provisions 4-1-1 GeneralRequires the contractor to performsampling inspectionin accordance with paragraph 4.2 and theproduct specification.When properproductand process designan
4、dprocess controlactivities are effective, sampling inspection is aredundanteffort and anunnecessarycost.Contractors are encouraged to consider submittingalternate acceptance methodsfor one or more characteristics. 4-1-2 Requirements and Procedures Contractors quality systems in according withMIL-Q-9
5、858 enhanced with SPC,ANSI/ASQC Q9004are qualified to apply for alternate acceptance methods.The current minimum values of process capability are equivalent to aCpkof2.00 for critical characteristics,1.33 for major characteristics,1.00 for minor characteristics 4-1-3 Submission and incorporation 4-1
6、-4 Withdrawal of approval of alternates,MIL-STD-1916,4-2 Acceptance by table4-2-1 Preferred sampling plansthis standard establishesthree setsof matched sampling plans, inspect the samplesfrom lotsbyattributesorvariables measurementand forcontinuous samplingbyattributes measurement.the three sets are
7、 indexed bysevenspecified verification levels (VL) and five code letters (CL), which are determined by the lot or production interval size.4-2-2 Formation and identification of lots or batches4-2-3 Determination of sampling plan a. VL as specified.b. Type of sampling ( attributes, variables, or continuous)c. Lot size CL from table Id. Switching procedure4-2-4 Sampling of lots or batches,MIL-STD-1916,MIL-STD-1916(计数型),MIL-STD-1916 OC Curve,VL=III CL=E n=80,VL=IV CL=E n=192,VL=V CL=D n=384,Lot size54419216,100ppm时, Pa仅96%,2%时, Pa尚有20%,MIL-STD-1916(计量型),MIL-STD-1916(连续型),
