【正文】 or there is no Design Control. . . . . etc 36 DFMEA 設(shè)計(jì)失效模式及后果分析 (18) Risk Priority Number (RPN) 風(fēng)險(xiǎn)順序數(shù) (RPN) – RPN = S * O * D 風(fēng)險(xiǎn)順序數(shù)是嚴(yán)重度數(shù) (S),頻度數(shù) (O),和不易探測度數(shù) (D)的乘積 – Used as a guide to help rank process concerns 用來對(duì)過程中所擔(dān)心的事項(xiàng)排序 – Golf score concept (Lower is better) 就象高爾比賽得分那樣 ,數(shù)值越小越好 – There are no “ threshold ” values 沒有標(biāo)準(zhǔn)分值 – Special attention should be given when severity is high (as defined by the team, including the Customer) 由可行性小組 (包括顧客 )所定義的嚴(yán)重度高時(shí)要給予特別關(guān)注 37 DFMEA 設(shè)計(jì)失效模式及后果分析 (18) 風(fēng)險(xiǎn)順序數(shù) (RPN) 0100200300 Like the chart,sort the RPN, and take corrective actions to reduce the higher ones。 ? 要減少失效的嚴(yán)重度級(jí)別數(shù)值，只能通過修改設(shè)計(jì)來實(shí)現(xiàn)。 ? 推薦的評(píng)價(jià)準(zhǔn)則： (請(qǐng)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(jì)失效模式及后果分析 Suggested Evaluation Criteria 推薦的評(píng)價(jià)準(zhǔn)則 ? This is the suggested criteria 這是推薦的準(zhǔn)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(jì)小組對(duì)評(píng)定準(zhǔn)則和分級(jí)規(guī)則應(yīng)意見一致，即使因?yàn)閭€(gè)別產(chǎn)品分析作了修改也應(yīng)一致。 就象圖表所示 ,先排列出所有的風(fēng)險(xiǎn)順序值 ,然后優(yōu)先解決高分值問題 38 DFMEA 設(shè)計(jì)失效模式及后果分析 (19) Remended Action(s) 建議措施 ? Intent is to reduce Severity, Occurrence, and/or Detection rankings 目的是為了減少嚴(yán)重度，出現(xiàn)頻次，和 /或不易探測度 ? Examples 例如 – DOE 試驗(yàn)設(shè)計(jì) – Revised Test Plan 修改試驗(yàn)計(jì)劃 – Revised Design 修改設(shè)計(jì) – Revised Material Specification 修改材料性能要求 39 DFMEA 設(shè)計(jì)失效模式及后果分析 ? (20) Responsibility/ Target Date 責(zé)任 /目標(biāo)日期 ? (21) Actions Taken 采取的措施 ? (22) Resulting RPN 糾正后的 RPN 40 PFMEA 過程失效模式及后果分析 Development of a Process FMEA 過程 FMEA的開發(fā) ? Assemble Team 成立小組 ? Assign Responsibilities 職責(zé)分配 – leader 組長 – datagathering 數(shù)據(jù)收集 – recorder 記錄員 ? Process flow diagram is valuable at this point 在這個(gè)時(shí)候 , 過程流程圖是非常有用的 . ? Begin FMEA 開始 FMEA工作 41 PFMEA 過程失效模式及后果分析 Header Information 前面的信息 ? Items (1) through (8) 從 (1)至 (8)項(xiàng) ? Essentially the same as Design FMEA 內(nèi)容基本上與 DFMEA一樣 . 42 PFMEA 過程失效模式及后果分析 (9) Process Function/Requirements 過程功能 /要求 – Enter description and purpose 輸入功能描述和目的 . – Be as concise as possible 盡可能簡要 . (10) Potential Failure Mode 潛在失效模式 – “ … the manner in which the process could potentially fail to meet the process requirements and/or design intent.” “ … 是指過程可能發(fā)生的不滿足過程要求和 /或設(shè)計(jì)意圖的形式 . – A description of nonconformance 是對(duì)不符合的一個(gè)描述 . – Assume ining parts are correct 假定提供的部件都是合格的 . – Remember to consider subsequent operations. 記得要考慮下道工序 . 43 PFMEA 過程失效模式及后果分析 (11) Potential Effect(s) of Failure 潛在失效后果 – Effect of failure mode based on what customer might notice/experience 失效模式后果是依據(jù)顧客可能注意到的或所經(jīng)歷的 . – Includes subsequent process operations 應(yīng)包括下道工序操作 . (12) Severity 嚴(yán)重度 – The seriousness of the effect of the potential failure mode 是指潛在失效模式后果的嚴(yán)重程度 . – Suggested Evaluation Criteria (Please refer to Page 35 of the FMEA MANUAL.) 推薦的評(píng)價(jià)準(zhǔn)則 . (請(qǐng)參考 FMEA手冊 ) – Similar to Design FMEA, but also considers operations/subsequent process operations. 與 DFMEA一樣 , 但應(yīng)考慮操作或下道工序操作 . 44 PFMEA 過程失效模式及后果分析 (13) Classification 分級(jí) – Similar to Design FMEA 與 DFMEA一樣 . – If classification is made, notify responsible design engineer. 如果確定了某一分級(jí) , 應(yīng)通知設(shè)計(jì)主管工程師 . – If classification is made, must be addressed in the Process Control Plan. 如果確定了某一分級(jí) , 它一定要包括在過程控制計(jì)劃中 . (14) Potential Cause(s)/Mechanism(s) of Failure 潛在失效起因 /機(jī)理 – “ … how the failure could occur. ” “ … 失效是怎樣發(fā)生的 .” – Described in terms of something that can be corrected/controlled 應(yīng)用術(shù)語來形容那些可糾正或控制的機(jī)理或起因 – Requires determination of Root Cause 要求要決定根本起因 . 45 PFMEA 過程失效模式及后果分析 (15) Occurrence 頻度 (O) – If available, statistical data should be used 如果必要 , 可應(yīng)用數(shù)據(jù)統(tǒng)計(jì) . – Suggested Evaluation Criteria: 推薦評(píng)價(jià)標(biāo)準(zhǔn) . Please refer to Page 39 of the FMEA MANUAL. 請(qǐng)參考 FMEA手冊第 39頁 46 PFMEA 過程失效模式及后果分析 (16) Current Process Controls現(xiàn)行過程控制 – There are three types of Process Controls/features to consider。or there is no Design Control. . . . . etc Please refer