An improved FMECA for feed system of CNC machining center based on ICR and DEMATEL method

The Failure Mode, Effects and Criticality Analysis (FMECA) has been widely applied in the reliability research of machining centers in recent years. However, conventional FMECA does not take opinions of different team members or the relationship between the modes and causes of failure into account when considering the assignment of criticality. Thus, an improved FMECA (IFMECA) is proposed to overcome the disadvantages. The IFMECA method applied group decision-making theory to effectively combine every team member’s evaluation. Subsequently, weights of the factors were determined based on the combination of entropy and expert evaluation. Failures were then prioritized by decision-making trial and evaluation laboratory (DEMATEL) method. In this paper, improved criticalities (ICR) were calculated and failures of feed systems were prioritized by IFMECA based on the failure data of the feed system. According to the rank of failure modes obtained through IFMECA, it is observed that vibration or oscillation, motion parts output failure, and inaccurate re-home have more negative impacts on the feed system. Furthermore, this paper asserts that IFMECA method could also be applied to analyze other complex mechanical systems.

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