基於PFMEA資訊建置電源供應器設計失效風險評估系統之研究

The Study and Implementation of Failure Risk Evaluation System for Power Supply Design Based on PFMEA Information

劉天倫(Tien-Lun Liu) ； 劉旭偉(Hsu-Wei Liu)

《品質學報》 16卷6期 (2009/12) Pp. 387-406

摘要

隨著科技快速發展和顧客要求變化的加快，現在產品開發流程的週期愈來愈短，導致很多問題在量產時才發現，造成生產時不良率的提高與品質的降低，此議題必須從設計階段來修正。利用新產品在少量試產時，去評量設計的缺陷與生產製程中所遭遇的困難，並找尋可能發生的問題點，使用製程失效模式與效應分析(PFMEA)的方法將問題點的潛在失效影響加以分析，評估其風險優先指數，使產品的缺陷能夠加以排序與改善，因而降低設計變更次數，強化製程能力，進一步提昇產品品質。本研究以直流電源供應器系列爲研究對象，希望藉由系統化與量化的方式，從PFMEA失效因素的資訊，運用公理設計的觀念，來探討攸關品質要求在產品設計上的因子；首先我們應用產品領域間對應的觀念建立功能需求(FRs)、設計參數(DPs)與製程變數(PVs)之間關聯矩陣，其次，研究電源供應器的PFMEA，並反向運用上述關聯矩陣來系統化得到失效模式(FMs)與功能需求、設計參數或是製程變數間的關聯值。這些關聯值反應出關係強度，進而表達出產品設計上考量的有用資訊。最後我們利用Excel VBA (Visual Basic Application)程式將前述資訊建置一個失效風險評估系統，可協助設計人員定義關聯或查詢，開發更好品質的電源供應器產品。

關鍵字

製程失效模式與效應分析 ； 關聯矩陣 ； 公理設計 ； 產品設計品質 ； 電源供應器

並列摘要

As the technology is developing rapidly, the requests from customers are changing very quickly. The cycle time of product development process is reduced so that the chance of problems occurring during the mass production increases, which causes bad yield rate and poor quality. Therefore this issue should be remedied from the design phase. To measure the defects of design and the difficulties of manufacture, we need to seek for possible problems in production during pilot run. Using the method of PFMEA (Process Failure Mode and Effects Analysis) to analyze problems and evaluate their RPN (Risk Priority Number), the defects of products could be prioritized and improved. Design changes can then be reduced to strengthen the production capability as well as further enhance product quality. The research is focused on the products of DC Power Supply. We first establish the relationship matrices among Functional Requirements (FRs), Design Parameters (DPs) and Process Variables (PVs) by applying the concept of product domain mapping. Secondly, we study the PFMEA of power supply and use these matrices in reverse to systematically obtain the related values between failure modes and PVs, DPs, or FRs. These related values reflect the intensity of relationships, which represent some useful information for the design consideration of products. Finally, we applied Excel VBA (Visual Basic Application) programming to implement a Failure Risk Evaluation System based on the previous information to help designers to develop new power supply products with better quality.

並列關鍵字

process failure mode and effects analysis ； axiomatic design ； relationship matrix ； product design quality ； power supply design

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