【文章內(nèi)容簡介】 (11) Potential Effect(s)of Failure 潛在失效后果 – Effect on function 對系統(tǒng)功能的影響 – As perceived by customer 如顧客感受的一樣 24 DFMEA 設(shè)計失效模式及后果分析 (12)Severity (S) ? The seriousness of the effect of the potential failure mode. ? A reduction in Severity Ranking can only occur as a result of a design change. ? Suggested Evaluation Criteria: Effect criteria : Severity of Effect Ranking Hazardous Very high severity ranking when a potential failure mode affects safe vehicle operation and/or involves without warning: nonpliance with government regulation without warning. 10 Hazardous with Very high severity ranking when a potential failure mode affects safe vehicle operation and/or involves warning: nonpliance with government regulation with warning. 9 . . . . . . Etc. Please refer to page 13 of the FMEA Manual 25 DFMEA 設(shè)計失效模式及后果分析 (12)嚴重度 (S) ? 潛在失效模式影響后果的嚴重程度。 ? 要減少失效的嚴重度級別數(shù)值，只能通過修改設(shè)計來實現(xiàn)。 ? 推薦的評價準則： (請參考 FMEA手冊中第 13頁 ) Effect criteria : Severity of Effect Ranking Hazardous Very high severity ranking when a potential failure mode affects safe vehicle operation and/or involves without warning: nonpliance with government regulation without warning. 10 Hazardous with Very high severity ranking when a potential failure mode affects safe vehicle operation and/or involves warning: nonpliance with government regulation with warning. 9 . . . . . . Etc. 26 DFMEA 設(shè)計失效模式及后果分析 Suggested Evaluation Criteria 推薦的評價準則 ? This is the suggested criteria 這是推薦的準則 ? The team should agree on an evaluation criteria and ranking system, which is consistent, even if modified for individual product analysis 設(shè)計小組對評定準則和分級規(guī)則應(yīng)意見一致，即使因為個別產(chǎn)品分析作了修改也應(yīng)一致。 – have your customer’s concurrence 取得顧客的同意 – include the revised criteria in your documentation 在文件中包括已修改的準則 – be consistent throughout the analysis 在分析中保持一致性 27 DFMEA 設(shè)計失效模式及后果分析 (13) Classification 分級 Used to classify any special product characteristic for ponent, subsystem or system characteristics that may require additional process controls. 可用于對零件、子系統(tǒng)或系統(tǒng)的產(chǎn)品特性分級，它們可能還需要附加的過程控制。 ? Safety and/or GovernmentRegulated Characteristics 安全性和 /或政府法規(guī)特性 – Safety Item安全條款 – Critical Characteristic 關(guān)鍵特性 – Safety/Compliance 安全 /符合 – Key Product Characteristic 關(guān)鍵產(chǎn)品特性 28 DFMEA 設(shè)計失效模式及后果分析 ? Important Performance, Fit, or Appearance Characteristics 重要性能，安裝或外觀特性 – Critical Characteristic 關(guān)鍵特性 – Critical Verification 關(guān)鍵確認 – Significant Characteristic 重要特性 – Fit/Function Key Product Characteristic 配合 /功能關(guān)鍵產(chǎn)品特性 ? Use your customer’s methods 應(yīng)用顧客的方法 29 DFMEA 設(shè)計失效模式及后果分析 (14) Potential Causes/Mechanism(s) of Failure 潛在失效的起因 /機理 ? Indication of a design weakness 設(shè)計薄弱部分的跡象 ? Consequence is failure mode 結(jié)果就是失效模式 ? List every conceivable cause/mechanism of failure 列出每個可以想到的失效起因 /機理 30 DFMEA 設(shè)計失效模式及后果分析 (15) Occurrence(O) ? The likelihood that a specific cause/mechanism of failure will occur ? Can only be reduced by a design change that removes or contros a cause/mechanism of failure ? Suggested Evaluation Criteria: Probability of Failure Possible Failure Rates Ranking Very high: Failure is almost inevitable ? 1 in 2 10 1 in 3 9 High: Repeated failures 1 in 8 8 1 in 20 7 Moderate: Occasional failures 1 in 80 6 1 in 400 5 1 in 2,000