抽樣作業(yè)指導書 Sampling Plan for Inspection Instruction.doc

抽樣作業(yè)指導書 Sampling Plan for Inspection InstructionRev.AAOri. DateDoc No.PagePage9of 9Record of Revision:No.RevOriginatorSummariesDateCCF No.12345678910DISTRIBUTION:Department Organization 1. Purpose 目的 This instruction serves to standardize the sampling standard applying ANSI/ASQC Z1.4 to conduct incoming materials and finish goods inspections, ensuring products meeting quality requirements. 本規(guī)程旨在規(guī)范使用ANSI/ASQC Z1.4單次抽樣法對來料進行抽樣檢驗，確保品質(zhì)符合規(guī)范要求。2. Scope 適用范圍This document is applicable to the inspection of all production materials and finished goods of * Company Limited Plant.本規(guī)程適用于*有限公司所有生產(chǎn)物料和成品的檢查。3. Responsibility職責Quality Manager has the responsibility and authority to implement this procedure wherever sampling is required 品質(zhì)經(jīng)理賦予全權(quán)負責執(zhí)行此流程。4. Definition定義AQL: Acceptable Quality Level 可接收質(zhì)量水平。Ac: Accept 接受Re: Reject 拒收CR: Critical 致命缺陷，會對人員造成傷害或火災等。MA: Major 嚴重缺陷，對產(chǎn)品有重大影響的缺陷。MI: Minor 輕微缺陷，對產(chǎn)品有影響的缺陷。5. Procedures作業(yè)程序5.1 Inspection Levels 檢查水平的規(guī)定：There are three general inspection levels (I, II & III) and four special inspection levels (S-1, S-2, S-3 & S-4).檢查水平分：一般檢查水平（I、II、III）和特殊檢查水平（S-1、S-2、S-3、S-4）。Unless otherwise specified, Inspection Level II will be used. However, Inspection Level I may be specified when less discrimination is needed, or Level III may be specified for greater discrimination. Four additional special levels: S-1, S-2, S-3, and S-4, are given in the same table and may be used where relatively small sample sizes are necessary and large sampling risks can or must be tolerated.除非另有規(guī)定，通常采用一般檢查水平 II 。當需要的判別力比較低時，可規(guī)定使用一般檢查水平 I ，當需要的判別力比較高時，可規(guī)定使用一般檢查水平 III 。特殊檢查水平僅適用于必須使用較小的樣本，而且能夠或必須允許較大的誤判風險。Individual Inspection levels are designated per category of non-conforming in principle, it should be noted that inspection levels correspond with acceptance level of quality.原則上按不合格的分類分別規(guī)定檢查水平，但必須注意檢查水平與合格質(zhì)量水平之間的協(xié)調(diào)一致。NOTE: In the designation of inspection levels S-1 to S-4, care must be exercised to avoid AQLs inconsistent with these inspection levels.For example, To correspond with the maximum sample size of single sampling plan for normal inspection exceeds 8 if sample size did not exceed D in S-1 level.If specified AQL =0.10, then the smaller sample sizes of single sampling plan for normal inspection is 125, therefore, S-1 shall be not to be used under AQL=0.10.注：在規(guī)定特殊檢查水平S-1至S-4時，必須注意避免檢查水平同所規(guī)定的合格質(zhì)量水平之間的矛盾。例如，在S-1中，樣本大小字碼沒有超過 D，相當于正常一次抽樣方案樣本大小最多等于8。若規(guī)定AQL=0.10,則正常檢查一次抽樣方案的最小樣本大小為125。因此，在規(guī)定AQL=0.10的情況下，不能規(guī)定使用特殊檢查水平S-1。5.2 Normal, Tightened and Reduced Inspection 檢查嚴格度的確定：Generally, there are three grades for inspection normal , tightened and reduced.Normal inspection will be used at the start of inspection unless otherwise directed by the responsible authority.檢查的嚴格度是指提交批所接受檢查的寬嚴程度，通常規(guī)定為-正常檢查、加嚴檢查和放寬檢查三種不同嚴格度的檢查。除非另有規(guī)定，在檢查開始時應使用正常檢查。5.3 Switching Procedures 轉(zhuǎn)移規(guī)則：5.3.1 Normal to Tightened 從正常檢查到加嚴檢查When normal inspection is in effect, tightened inspection shall be instituted when 3 out of 5 or fewer consecutive lots or batches have been non-acceptable on original inspection.當進行正常檢查時，若在連續(xù)檢查五批中有三批以上（不包括再次提交檢查批）不合格，則從下一批檢查轉(zhuǎn)到加嚴檢查。5.3.2 Tightened to Normal 從加嚴檢查到正常檢查When tightened inspection is in effect, normal inspection shall be instituted when 5 consecutive lots or batches have been considered acceptable on original inspection.當進行加嚴檢查時，若連續(xù)檢驗五批結(jié)果均（不包括再次提交檢查批）合格，則從下一批檢查轉(zhuǎn)到正常檢查。5.3.3 Normal to Reduced 從正常檢查到放寬檢查When normal inspection is in effect, reduced inspection shall be instituted providing that all of the following conditions are satisfied. a. The preceding 10 lots or batches (or more) have been on normal inspection and all have been accepted on original inspection; and b. The total number of nonconforming units (or nonconformities) in the samples from the preceding 10 lots or batches (or such other number as was used for condition “a” above) is equal to or less than the applicable limit number; andc. For Hi-tech products with at a steady rate; such as IC, resistor and capacitor; andd. Production is at a steady rate, reduced inspection is considered desirable by quality manager.當進行正常檢查時，若下列條件均滿足，則從下一批轉(zhuǎn)到放寬檢查。1. 連續(xù)10批或更多批（不包括再提交批）檢查結(jié)果合格；2. 在連續(xù)10或更多批所抽取的樣本中不合格品（或不合格）總數(shù)小于或等于規(guī)定的界限數(shù)；3. 對于高科技生產(chǎn)技術(shù)所生產(chǎn)出的產(chǎn)品，如IC，電阻，電容等；4. 生產(chǎn)中未發(fā)現(xiàn)有嚴重的異常情況，品質(zhì)經(jīng)理同意轉(zhuǎn)到放寬檢查。5.3.4 Reduced to Normal 從放寬檢查到正常檢查When reduced inspection is in effect, normal inspection shall be instituted if any of the following occur on original inspection:a. A lot or batch is rejected; orb. Production becomes irregular or delayed or major abnormity ; orc. Quality manager warrant that normal inspection shall be instituted.在進行放寬檢查時，若出現(xiàn)下列任一情況，則從下一批轉(zhuǎn)到正常檢查。1. 有一批放寬檢查不合格；2. 生產(chǎn)中發(fā)現(xiàn)嚴重異常情況；3. 品質(zhì)經(jīng)理認為有必要回到正常檢查。5.4 Discontinuation of Inspection 檢查的暫停和恢復If the cumulative number of lots not accepted in a sequence of consecutivelots on tightened inspection reaches 5, the acceptance procedures of this standard shall be discontinued. Inspection under the provisions of this standard shall not be resumed until corrective action has been taken. a) For incoming material, inform buyer stop purchasing this material.b) After discontinuation of inspection, if suppliers or productions corrective action has been taken, Quality manager warrant that tightened inspection shall then be used.加嚴檢查開始后，若不合格批數(shù)（不包括再次提交檢查批）累計到五批（不包括以前轉(zhuǎn)到加嚴檢查出現(xiàn)的不合格批數(shù)），則暫時停止按照本標準所進行的檢查，并通知采購暫停購買該供應商的物料。在暫停檢查后，若供貨方確實采取了措施，使提交檢查批達到或超過所規(guī)定的質(zhì)量要求，則經(jīng)質(zhì)量經(jīng)理同意后，可恢復檢查，一般應從加嚴檢查開始。5.5 Searches of Single Sampling Plan 一次抽樣方案的檢索5.5.1 Appendix A Sample size code letters 批量范圍及抽樣水平對照使用附表A。5.5.2 Table3 : Single sampling plans for normal inspection 檢索正常檢查一次抽樣方案使用附表3。5.5.3 Table4: Single sampling plans for tightened inspection檢索加嚴檢查一次抽樣方案使用附表4。5.5.4 Table5 : Single sampling plans for reduced inspection檢索放寬檢查一次抽樣方案使用表5。5.5.5 Searches Method檢索方法In Table I Sample size code letters, Sample sizes “n” are designated after selected code letter based on the size of batch or lot and AQL, then read out the number for judgment Ac, Re at the cross point of the row of sample sizes and column of specified AQL. Along the arrow and read out the first number for judgment Ac, Re if the cross point is a arrow, then leftward at the row of Ac Re direction meet sample size column to read out the correspond sample sizes “n” .Note: A. According to above method, maximum sample size be selected whatever non-conformity products or category when getting different sample size. B. AQL number for judgment 2,1 of single sampling plan can instead of judgment 0,1 of single sampling plan under customers agreement.由批量范圍及抽樣水平對照使用表2得到的樣本大小字碼水平向右，在樣本大小樣內(nèi)讀出樣本大小n，再從樣本大小字碼所在行和規(guī)定的合格質(zhì)量水平所在列相交處，讀出判定數(shù)組Ac ，Re。若在相交處是箭頭，則沿著箭頭方向，讀出箭頭所指的第一個判定數(shù)組Ac ，Re，然后由此判定數(shù)組Ac ，Re所在行向左，在樣本大小欄內(nèi)讀出相應的樣本大小n。注：A. 按上述檢索方法，對不同類的不合格品或不同類的不合格得到不同的樣本大小時，可以所讀出的樣本大小最大者所相應的抽樣方案。B. 在訂貨方同意的情況下，可以使用判定數(shù)