Failure analysis of CNC machines due to human errors: An integrated IT2F-MCDM-based FMEA approach

Abstract Computer numerical control (CNC) machining has become one of the salient transformative technologies due to its ability to manufacture precise components, scalable production, constant uptime, uniformity and repeatability. Despite the claim of minimum human intervention during CNC machining operation, operators’ involvement leading to CNC machine failures cannot be totally neglected. In this paper, a modified failure modes and effects analysis (FMEA)-based risk analysis approach is presented to identify the major human errors, their causes and effects during CNC machining operation based on the participation of a team of cross-functional experts. An integrated interval type-2 fuzzy sets (IT2FSs)-based multi-criteria decision making (MCDM) framework is subsequently developed for prioritizing the risks associated with each identified human error with respect to four pertinent risk factors, i.e. safety, economic consequences, occurrence and detection. However, due to lack of exact numerical values, the errors are linguistically assessed by the experts. To deal with subjective uncertainties, IT2FSs are chosen as a viable alternative due to their numerous superiorities over the traditional type-1 fuzzy sets (T1FSs). The IT2F-analytic hierarchy process (IT2F-AHP) is adopted to calculate weights of the risk factors, and IT2F-decision making trial and evaluation laboratory (IT2F-DEMATEL) is employed to model the causal interactions among different errors. For risk ranking, the traditional measurement of alternatives and ranking according to compromise solution (MARCOS) method is extended in IT2F-domain (IT2F-MARCOS). Finally, the computed risk ranking results are contrasted with other popular IT2FSs and T1FSs-based MCDM methods to validate feasibility of the proposed approach. This integrated framework comprising IT2F-AHP, IT2F-DEMATEL and IT2F-MARCOS is novel with respect to its development as well as application context and would surely be an interesting tool helping the entire decision making community.

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