효과적인 공정 FMEA 실행 방법

Abstract

Purpose: This paper proposes the methods and procedures to effectively identify and select potential failure modes to perform a process failure modes and effects analysis (FMEA).<BR>Methods: Detailed analyses of processes are generally required to prevent possible omissions and improper utilization of potential failure modes. In this study, a process decomposition is proposed for all procedures summarized in the process-flow chart to identify potential failure modes. To provide detailed identifications of the potential failure modes, a method of decomposing the process into work units is described. In addition, the 4M+1E elements, which are required for the decomposition, are found and listed. Each of the operational performance elements determined in this step was found to interfere with the work. Further, a method of identifying potential failure modes is proposed based on the determined work obstructions.<BR>Results: The process flow for an example screw-tightening procedure was decomposed into work units based on its process FMEA. A method to predict the potential failure modes for each disassembled work unit was also established based on the obstacles to work performance.<BR>Conclusion: By applying the proposed method to a screw-fastening process, it was confirmed that a process FMEA performed without process decomposition found unexpected potential failure modes.