【正文】 時作 PFMEAw何人作 PFMEAw如何作如何作 PFMEAw16步工作步驟PFMEA How do we do a PFMEA? A Summary怎樣進行 PFMEA？提要w Assemble the crossfunctional PFMEA team組建跨部門 PFMEA小組w List the failure modes, their effects, and their causes列出失效模式，后果以及原因PFMEAw Assess， 評估 Ethe severity of the effect (S) 后果的嚴(yán)重程度Ethe likelihood of the causes (O) 原因出現(xiàn)的可能性 Eand the ability of process controls to detect failure modes and/or their causes (D)過程控制探測失效模式和 /或原因的能力How do we do a PFMEA? A Summary怎樣進行 PFMEA？提要PFMEAw Calculate the risk priority number (RPN) to prioritize corrective actions 計算風(fēng)險順序數(shù) (RPN)以確定應(yīng)優(yōu)先采取的糾正措施w Plan corrective actions and assign owner制訂糾正措施并落實責(zé)任人w Perform corrective actions to improve the product or process, 采取糾正措施以提高產(chǎn)品和過程質(zhì)量w Recalculate RPN重新估算 RPNHow do we do a PFMEA? A Summary怎樣進行 PFMEA？提要PFMEA How do we do a PFMEA?A Suggestion怎樣進行 PFMEA？建議w Do your work on scratch paper first。t fet auxiliary functions as well a primary functions基本功能和輔助功能都要考慮3. List the function(s) of each operation列出每個操作的功能PFMEA 4. List the quality requirements列出質(zhì)量要求w a customer want or desire顧客的希望或要求w could seriously affect customer perception有可能嚴(yán)重影響顧客的看法 w could lead to a customer plaint 有可能導(dǎo)致顧客投訴PFMEA 5. List the potential process failure modes 列出可能的過程失效模式w a defect, flaw, or other unsatisfactory condition in the product that occurs when the process fails to meet the process requirements由于過程未達到要求而導(dǎo)致的產(chǎn)品缺陷、瑕疵等不良狀態(tài)Efailure modes should be written in terms of the condition of the product失效模式體現(xiàn)在產(chǎn)品上PFMEAw Typical Failure Modes，幾種典型失效模式Ediameter out of spec.，直徑超差Emissing seal，漏裝密封墊Ecut strands，切破線皮Emisoriented part，部件方向錯Einsufficient solder，焊劑不足Etoo much solder，焊劑過量ENFO，未充滿EFlash，飛邊5. List the potential process failure modes 列出可能的過程失效模式PFMEAw Note，注 EAssume that ining product and materials are correct假設(shè)來料沒問題EAssume that the product as designed will meet requirements假設(shè)產(chǎn)品設(shè)計能夠滿足客戶需求5. List the potential process failure modes 列出可能的過程失效模式PFMEA 6. Derive the potential effects of each failure 列出每一失效模式的所有可能后果w The ramifications of failure后果是失效模式的衍生事件 w The effect can be on ，可能影響Ethe ultimate customer，最終用戶Eor intermediate customer (OEM, etc.)，中間用戶Ea government regulation ，法規(guī)Ethe next process step，下序PFMEAw Customer plaints are a useful source of information顧客抱怨是非常有用的信息來源6. Derive the potential effects of each failure 列出每一失效模式的所有可能后果PFMEAw An effect can be，后果可能為 Eplete loss of function，功能完全喪失 Edegradation of performance or quality，質(zhì)量或性能降低Edamage of process equipment，設(shè)備受損Einjury to an operator，員工受傷Eshutdown of an assembly line，停線6. Derive the potential effects of each failure 列出每一失效模式的所有可能后果PFMEAw Effects of failure often show up as a chain of events, from immediate effect to the ultimate effect on the customer，失效的后果通常表現(xiàn)為從對顧客的直接影響到最終影響等一系列連鎖反應(yīng)w It is remended that these chains be developed for each failure mode and recorded on the FMEA form 建議針對每一種失效模式找出這些連鎖反應(yīng)，并記錄在FMEA表上Euse a tree diagram運用樹形圖6. Derive the potential effects of each failure 列出每一失效模式的所有可能后果PFMEAEffects on the process，對過程的影響 :w 910 may endanger machine or operator，可能導(dǎo)致設(shè)備或人員受損w 68 scrap，報廢w 45 sort and rework，檢驗、返工w 23 rework online，線上返工w 1 no effect，無影響consider also the effects on the customer還要考慮對顧客的影響還要考慮對顧客的影響7. Assess the severity of each effect評估每種后果的嚴(yán)重度PFMEACriteria: Severity of EffectThis ranking results when a potential failure mode results in a final customer and/or a manufacturing/assembly plant defect. The final customer should always be considered first. If both occur, use the higher of the two sev　 Hazardouswithout warning10 Very high severity ranking when a potential failure mode affects safe vehicle operation and/or involves nonpliance with government regulation without w