製程失效模式與效應分析中的風險優先排序方式對ODM 新產品導入的影響

Abstract

RPN 是FMEA 用以分析潛在風險問題優先順序的排序方法。在傳統的RPN 中， 每個失效模式均視為獨立個體進行優先排序，並沒考慮其交互關連的因果關係也有可能影響排序的優先順序，即相同的失效模式可能由不同的失效原因造成，或者是不同的失效模式卻是由相同的失效示原因造成。本文以Ｗ公司某產品的到貨不良(Dead on Arrival，DOA)與製程失效模式與效應分析(Process FMEA，簡稱PFMEA)之間的關聯。分析後發現其DOA 的主要不良項目曾出現於該產品的PFMEA 的表單中，但卻因其風險優先排序因素而被忽略造成損失。但是，如果把失效模式與失效原因的關連性納入PFMEA 的排序考量，取代傳統RPN 的計算方法來進行重新排列次序，將可改善及降低到貨不良的情形，藉以增加 PFMEA 對新產品導入的效益影響。

The RPN methodology is a technique for analyzing the risk associated with potential problems identified in the FMEA. In the convential RPN, it is regarding the failure mode as independent and does not consider the correlation among failure mode and caused of failure, which may impact the priority rank setting due to ignores those secenarios that same failure modes are caused by the different reasons or different failure modes are casued by the same reasons. This thesis studies the correlation between DOA (Dead on Arrival) and Process PFMEA by one of the product history data in Company W. After mapping the DOA major defects and their releated PFMEA potential failure modes, found those major defects had been recorded into the PFMEA form before, however, it is neglected and caused the loss due to their low risk ranking. However, if it applies the correlation among failure mode and caused of failures into consideration and replacing the convential RPN to recalculate the priority ranking, it can improve and reduce the DOA and raise the PFMEA benefit for new product introduction.