有關(guān)iso900114001,ohsas18000等管理系統(tǒng)中的重要觀念(ppt48頁)-wenkub
2023-02-05 21:15:22 本頁面
【正文】 h: Vehicle/item inoperable, with loss of primary function. 8 High: Vehicle/item operable, but at reduced level of performance. Customer dissatisfied . 7 Moderate: Vehicle/item operable, but Comfort/Convenience Item(s) inoperable. Customer experiences 6 disfort. Low: Vehicle/item operable, but Comfort/Convenience item(s) operable at reduced level of 5 performance. Customer experiences some dissatisfaction . Very Low: Fit Finish/Squeak Rattle item does not conform. Defect noticed by most customers. 4 Minor: Fit Finish/Squeak Rattle item does not conform. Defect noticed by average customer. 3 Very Minor: Fit Finish/Squeak Rattle item does not conform. Defect noticed by discriminating 2 customer. None: No Effect. 1 ? 潛在失效的原因或機(jī)構(gòu) ? 呈現(xiàn)出設(shè)計(jì)缺陷 ? 導(dǎo)致失效的後果 ? 盡可能列出所有想得到的原因 /機(jī)構(gòu) ? 典型失效原因： ?錯(cuò)誤的材料規(guī)範(fàn) ?不當(dāng)?shù)膲勖僭O(shè) ?應(yīng)力超限 ?潤滑能力不足 ?環(huán)境保護(hù)不良 ? 典型失效機(jī)構(gòu) ?彎曲變形 、 磨損 、 腐蝕 、 疲勞 、 搖晃 DFMEA失效模式效應(yīng)分析 DFMEA失效模式效應(yīng)分析 ? 發(fā)生機(jī)率 ? 特定失效原因 /機(jī)構(gòu)發(fā)生機(jī)率的高低 ? 唯有透過設(shè)計(jì)變更才能降低或消除原因 /機(jī)構(gòu) ? 評(píng)估準(zhǔn)則 (110分 ) ?類似零組件或次系統(tǒng)使用的經(jīng)驗(yàn) ?是否與上次變更前零組件雷同 ?工程變更的幅度顯著 ?零組件全然異於舊品 ?全新的零組件設(shè)計(jì) ?應(yīng)用上的變更 ?工作環(huán)境的變更 DFMEA失效模式效應(yīng)分析 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 4 Low: Relatively few failures 1 in 15,000 3 1 in 150,000 2 Remote: Failure is unlikely =1 in 1,500,000 1 DFMEA失效模式效應(yīng)分析 ? 目前設(shè)計(jì)管制 ? 確保設(shè)計(jì)有效性所執(zhí)行驗(yàn)證 、 確認(rèn) ? 原先的發(fā)生機(jī)率及偵測(cè)性已考量這些管制 ? 目前 意味著相同或類似設(shè)計(jì) ? 設(shè)計(jì)管制有三種類型： ?防止或降低失效原因 /機(jī)構(gòu)的發(fā)生 ?偵測(cè)失效原因 /機(jī)構(gòu) ， 導(dǎo)致矯正行動(dòng) ?偵測(cè)失效模式 DFMEA失效模式效應(yīng)分析 ? 偵測(cè)性：現(xiàn)有設(shè)計(jì)管制找出失效原因 /機(jī)構(gòu) ? 以 110分來評(píng)估偵測(cè)能力 ? 提高設(shè)計(jì)管制的能力有助於降低偵測(cè)性 ? 風(fēng)險(xiǎn)優(yōu)先指標(biāo) (RPN) ? RPN = S X O X D
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