Prioritizing failures of abc-axis feeding systems based on improved criticality and DEMATEL method

The failure mode,effect,and criticality analyses(FMECA) were performed for the failure data of the abc-axis feed system of a certain machining center.The group decision-making theory was used to integrate the evaluation of every team member reasonably,the weight values of the factors were determined by the combinative method of entropy weight and expert evaluation,and the improved criticality(ICR) of every failure was calculated for the abc-axis feeding system.The DEMATEL method with the ICK as the input was used to prioritize the failures.The final prioritizing result by the proposed method was compared with the 2 prioritizing results by the criticality and the improved criticality,and the weak parts of the abc-axis feeding system were found.The proposed method can also be applied to analyze and prioritize the failures of the complete appliance,providing a basis for the reliability design and enhancement of the machining center.