FMEA严重性评估参考标准(中英文)

1、Suggested FMEA Detectio n Evaluati on CriteriaFMEA检测性评估参考标准Effect后果Criteria: Severity of E ffect 标准：后果严重性This ranking results when a potential failure mode results in a final customer and/or a manufacturing/assembly plant defect. The final customer should al ways be considered first. If both occur,

2、use the higher of the two severities. 此评分因潜在缺陷模式导致最终客户和/或一种制 作/安装缺陷而产生。通常会首先考虑最终客户。如果两者均有，采用其中较严重者。(Customer E ffect)(客户的后果)Criteria: Severity of E ffect 标准：后果严重性This ranking results when a potential failure mode results in a final customer and/or a manufacturing/assembly plant defect. The final cus

3、tomer should al ways be considered first. If both occur, use the higher of the two severities. 此评分因潜在缺陷模式导致最终客户和/或一种制 作/安装缺陷而产生。通常会首先考虑最终客户。如果两者均有，采用其中较严重者。(Manufacturing / Assembly E ffect)(制作/装配后果)Ranking评分Hazardous without warning 无预兆性 危险Failure mode att ects sate vehicle operation, cause some fu

4、nctional and reliable problems of operation / or involves noncompliance w ith government regulation without warning 缺陷模式在无警告的情况下影响产品的安全操 作、给用户造成操作不便及可靠性问题/不符合政府条文，严重性非常高May endanger operator (machine or assembly) without w arning无警告的情况下危害操作者 (机器或装配)10Hazardous with warning 有预兆性 危险Failure mode affect

5、s safe vehicle operation and cause some functional problem at the end user / or involves noncompliance w ith government regulation w ith warning缺陷模式在有警告的情况下影响产品的安全操 作、在最终用户处引起功能上的问题/不符合政府条文May endanger operator (machine or assembly) with warning有警告的情况下危害操作者 (机器或装配)9Very high 非常严重Vehicle / item inope

6、rable (loss of primary function) 产品不可用(失去基本功能)100% of product have to be scrapped, or repair time exceeds one hour100%的产品可能需要报废或修理时间超过一小时8High严重Vehicle / item operable but at a reduced level of performance. Customer very dissatisfied 产品性能下降、客户非常不满Product have to be sorted and a portion (less than 10

7、0%) scrapped, or repaired time betw een one and half an hour产品须分检且部分(非全部)需报废、 修理时间在半小时至一小时间7Moderate中等Vehicle / item operable but com fort / convenience items inoperable. Customer dissatisfied产品可使用但使用不便，客户不满A portion (less than 100%) of the product have to scrapped with no sorting, repair time less

8、than one hour部分产品需报废，不需分检， 修理时间小于一小时6Low低Vehicle / item operable but com fort / convenience items operable at a reduced level of performance产品可使用且使用不便、表现不良100% of product may have to be reworked, 产品可能需全部返工5Very low很低Item normal performance through being repaired.Defect noti ced by most customers (gr

9、eater than 75%)产品经过修理表现正常/大部分客户发现缺陷(超 过 75%)Product may have to be sorted, with no scrap and a portion (less than 100%) reworked 产品经过分检，无报废、部分须返工 (不到100%)4Minor轻微Item operable and does not conform. Defect noticed by 50% of customers.产品表现正常但使用不便/ 50%客户发现缺陷A portion (less than 100%) of the product may

10、 have to be reworked, w ith no scrap, on-line but out-of-station部分产品(不到100% )需要返工，无报废 在生产线上其它工序返工3Very minor细微Normal performance. Defect noticed by discriminating customers (less than 25%) 产品表现正常且可使用，有辩别力的客户(不到25% )发现缺陷A portion (less than 100%) of the product may have to be reworked, w ith no scrap

11、, on-line but out-of-station部分产品(不到100% )需要返工，无报废 在生产线上原工序返工2None无No discernible effect无辩别的影响Slight inconvenience to operation, no effect 轻微操作不便，无影响1Level级别Probability可能性Likely Failure Rates可能出现的缺陷机率(DPPM)以一百万块板里的缺陷数计(DPPM )PpkRanking评分Very high非常高Persistent failures缺陷持续不断> 100 per thousa nd piec

12、es50000-100000v 0.551050 per thousa nd pieces20000-50000> 0.559High高Freque nt failures缺陷频繁出现20 per thousa nd pieces10000-20000> 0.78810 per thousa nd pieces5000-10000> 0.867Moderate中等Occasi onal failures缺陷偶尔出现5 per thousa nd pieces2000-5000> 0.9462 per thousa nd pieces1000-2000> 1.005

13、1 per thousa nd pieces500-1000> 1.104Low低Relatively few failures缺陷相对较少0.5 per thousa nd pieces100-500> 1.2030.1 per thousa nd pieces10-100> 1.302Remote几乎不会Failure is unl ikely缺陷基本不可能出现< 0.01 per thousand pieces1-10> 1.671缺陷机率简算：1、假设抽检板数量共58000块，发现缺陷板数量116块；2、 计算缺陷板数量在总抽检板数量里所占比例：=116

14、- 58000 = 0.002，即0.2% ;3、缺陷机率即缺陷的百万分率(DPPM ) = 0.2% X 100,0000 = 200 ;4、 核对机率性评估参考标准：缺陷机率200介于100500之间，故机率性评分为3分;Detectio n检测性Criteria标准In specti on types检测种类Suggested range of detecti on methods检测方法的建议范围Ranking评分Error- proofed防错Gauging量具Manual Inspection 人工（手动）检测Almost impossible 几乎不可能Absolute cert

15、ainty of non-detection 绝对不能检测XCannot detect or is not checked不能检测或没有检测10Very remote 很微小Controls will probably not detect 控制方法可能检测不岀XControl is achieved w ith indirect or random check s only只能通过间接或随机检查来控制9Remote微小Controls have poor chance of detection 控制检测机会少XControl is achieved w ith visual inspecti

16、on only只能通过目视检测来控制8Very low很小Controls have poor chance of detection 检测缺陷及防止漏 波机会少XControl is achieved w ith double visual inspection only只能通过双重目视检测来控制7Low小Controls may detect 控制可能检测岀XXControl is achieved w ith charting methods, such as SP C用控制图方法控制（如SPC）6Moderate普通Controls may detect 控制可能检测岀XControl

17、 is based on variable gauging after parts have left the station, or GO/NO go gauging performed on 100% of the parts after parts have left the station在产品进入下工序后进行抽样测量来控制缺 陷或在产品进入下工序后对产品百分百测量 /不测量来控制缺陷5Moderately high 较高Controls have a good chance to detect 控制有较多检测机 会XXError detection in subsequent ope

18、rations, or gauging performed on setup and first-piece check （for setup causes onl y） 在下工序的误差检测，或在准备生产时进行 测量及首板检查（仅由设置引起）4High高Controls have a good chance to detect 控制有很多检测机 会XXError detection in-station, or error detection in subsequent operations by multiple layers of acceptance: supply, select, install, veri fy.Cannot accept di screpant part 在本工序的误差检测，或利用多层验收后在 下工序进行误差检测，供应，选择，安装， 确认，不接受不合格产品3Very high很咼Controls almost certain to detect 控制几乎肯定能检 测岀XXError detection in