10stepstoconductapfmea全英文版-全文預覽
【正文】 ace for each failure mode and then assign a detection ranking to each control. Detection rankings evaluate the current process controls in place. A control can relate to the failure mode itself, the cause (or mechanism) of failure, or the effects of a failure mode. To make evaluating controls even more plex, controls can either prevent a failure mode or cause from occurring or detect a failure mode, cause of failure, or effect of failure after it has occurred. Note that prevention controls cannot relate to an effect. If failures are prevented, an effect (of failure) cannot exist! The Detection ranking scale, like the Severity and Occurrence scales, is on a relative scale from 1 to 10. A Detection ranking of “1” means the chance of detecting a failure is certain. Conversely, a “10” means there is absolute certainty of nondetection. This basically means that there are no controls in place to prevent or detect. See FMEA Checklists and Forms for an example PFMEA Detection Ranking Scale. Taking a lead from AIAG, consider three different forms of Custom Detection Ranking options. Custom examples for MistakeProofing, Gauging, and Manual Inspection controls can be helpful to PFMEA teams. See FMEA Checklists and Forms for examples of Custom PFMEA Ranking Scales. (Examples of custom scales for severity, occurrence, and detection rankings are included in this Appendix.) Return to topStep 7: Calculate the RPNThe RPN is the Risk Priority Number. The RPN gives us a relative risk ranking. The higher the RPN, the higher the potential risk. The RPN is calculated by multiplying the three rankings together. Multiply the Severity ranking times the Occurrence ranking times the Detection ranking. Calculate the RPN for each failure mode and effect. Editorial Note: The current FMEA Manual from AIAG suggests only calculating the RPN for the highest effect ranking for each failure mode. We do not agree with this suggestion。 this is the time to be thorough. Prepare for the brainstorming session. Before you begin the brainstorming session, review documentation for clues about potential failure modes. Return to topStep 3: List Potential Effects of FailureDetermine the effects associated with each failure mode. The effect is related directly to the ability of that specific ponent to perform its intended function. An effect is the impact a failure could make if it occurred. Some failures will have an effect on the customers and others on the environment, the facility, and even the process itself. As with failure modes, use descriptive and deta
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