【正文】 ts, causes, and current controls for each failure mode 8 Assign ratings for Severity, Occurrence, and Detection 9 Calculate RPN 10 Decide on a threshold RPN 11 Prioritize based on RPN and severity, or as required by the customer 12 Identify corrective actions 13 Implement and verify effectiveness of corrective action 14 Complete the documentation 1 Define the scope for the FMEA Define the boundaries within which the product, process, or service will be studied, identifying the operating assumptions, current conditions, and constraints if any. Example 1: Conduct a Process FMEA on PCB manufacturing line 1, starting with operation 10 and ending with operation 250. The assumption is that design of parts is correct, and no shortages The line is setup as shown in process flow drawing 809901 Example 2: Conduct Design FMEA on the pressure relief valve (Part JJJKKK) for potential failures under extreme operating conditions Assume no preventive maintenance will be conducted once installed Document on the FMEA startup form FMEA。 Step by Step Scope of the FMEA ? Points to consider: ? Who are the customers for the FMEA, and what are their requirements / expectations ? Example: Conduct (Process) FMEA on the assembly line for Product A, covering operations 110 through 230 ? When will this FMEA be considered plete under the given conditions (Remember, FMEAs are considered living documents, as such they need to be updated / revised as things change.) ? Example: FMEA will be considered plete when the team has implemented all corrective actions as agreed upon based on the RPN threshold This will form the basis for deciding the level at which you should conduct the FMEA, and the scope of work involved. . Level Focus Failure Cause Effect Mode System Car Overheating Cooling syst. Stranded on failure the road Sub System Cooling System Inadequate Thermostat Car Overheating coolant flow stuck closed Sub Assembly Thermostat Stuck closed Bi Metal Spring Inadequate broken coolant flow Component Bi Metal Spring Broken Fatigue Thermostat stuck closed Important: You must be able to see a cascading of failure modes, causes, and effects similar to above Example of a Product Safety, Lubrication Engine, Braking, Exhaust Trans., Cooling Thermostat Diaphragm, Bi Metal Spring Radiator Pump V Belt The Influence of Level Company Plant 1 Plant 2 Plant 3 Plant 4 PCB Line Power Supplies FHP Motors Op 10 Op 20 …. …. Op 250 FMEA can be conducted at any of these levels。 Pareto Analysis, Top cause for each failure mode, etc. Document on FMEA startup form to indicate this was discussed, and agreement reached on the threshold value. FMEA Step by Step 10 Decide on a threshold RPN, without ignoring high severity failure modes Example using Pareto Chart: Causes Cumulative RPN Cumulative RPN Curve 80% of Cumulative RPN FMEA Step by Step 10 Decide on a threshold RPN, without ignoring high severity failure modes Example using RPN=200 for each failure mode: P r od uc t Fa i l ure E f f e c t S C a us e O C urr e nt D R P NP r oc e s s M od e C on t r ol sor S e r v i c eC a r O v e r h e a t s S t r a n d e d o n 7 C o o l i n g 3 T e m p g a g e 4 84R o a d S y s t e mB i n d i n g 3 N o n e 10 210b r a k e sO v e r l o a d e d 8 L o a d c a p a c i t y 8 448l i s t e d o n s i d e o f d o o rE x t r e m e 3 L i s t e n t o 5 105h o t w e a t h e r f o r e c a s t sS k i d s A c c i d e n t 10 S l i c k r o a d s 7 L i s t e n t o 5 350I n j u r y f o r e c a s t sW o r n t i r e s 4 Y e a r l y i n s p . 4 160D r i v i n g h a b i t 7 A B S a n d 5 350t r a c t i o n c o n t r o lFMEA Step by Step 11 Prioritize based on RPN and severity, or as required by customer ? Arrive at the order in which you will start addressing the failure modes and causes for corrective action. Although RPN and severity based prioritization seems the most logical, your decision to proceed must be made with customer input. ? This step is easily acplished by sorting the data, in descending order. You can do this within each failure mode to maintain data integrity. ? Documentation on work sheet is important to ensure the whole team is in sync. FMEA Step by Step 11 Prioritize based on RPN and severity, or as required by customer Example of sorted worksheet by RPN within each failure mode P r od uc t Fa i l ure E f f e c t S C a us e O C urr e nt D R P NP r oc e s s M od e C on t r ol sor S e r v i c eC a r O v e r h e a t sS t r a n d e d o n r o a d 7 O v e r l o a d e d 8Load c a p a c i t y l i s t e d o n s i d e o f d o o r 8 448B i n d i n g b r a k e s 3 N o n e 10 210E x t r e m e h o t w e a t h e r 3L i s t e n t o f o r e c a s t s 5 105C o o l i n g s y s t e m 3 T e m p g a g e 4 84S k i d sA c c i d e n t i n j u r y 10 S l i c k r o a d s 7L i s t e n t o f o r e c a s t s 5 350D r i v i n g h a b i t 7A B S a n d t r a c t i o n c o n t r o l 5 350W o r n t i r e s 4 Y e a r l y i n s p . 4 160FMEA Step by Step 12 Identify corrective action ? In this step you identify the corrective actions needed to eliminate / control the causes, and reduce the risk level to or below the agreed upon threshold. There will be times when you cannot work on the root cause。 數(shù)據(jù)即時(shí)采集，分析，導(dǎo)出，打印，和自動(dòng)