Abstract
In order to enhance quality and reliability of mechanical and electrical products, the methods of taking corresponding corrective measures to eliminate or alleviate product failure in advance have been widely concerned. Failure mode and effects analysis (FMEA) is a typical prevention reliability analysis method. However, there are some drawbacks in traditional FMEA method. To overcome these drawbacks, we propose a hybrid risk evaluation method, which combines picture fuzzy sets (PFSs), the PF-linear programming model (PF-LPM) method and the PF-weighted aggregated sum product assessment (PF-WASPAS) method. We adopt PFSs to evaluate risks of products. In order to overcome drawback of the traditional distance between PFSs, some new distance measures between PFSs based on the Dice similarity and the Jaccard similarity are proposed by us. The PF-LPM method which considers the subjective weights of risk factors and calculates synthetical deviation with the Dice similarity-based distance is utilized to calculate the weights of risk factors. Moreover, the PFWA operator and the PFWG operator are used by us to fuse experts’ evaluation information. Then, the PF-WASPAS method is utilized to rank failure modes. Finally, an illustrative example with respect to pallet exchange rack is introduced, and the rationality, effectiveness and applicability of the proposed method are verified by a discussion and comparison.
Highlights
IntroductionAs one of the six key quality characteristics (reliability, precision, precision life, maintainability, availability and precision stability) of CNC machine tools, reliability plays an important role in the quality improvement of CNC machine tools (Chen et al.)
As one of the six key quality characteristics of CNC machine tools, reliability plays an important role in the quality improvement of CNC machine tools (Chen et al.)
In order to explain the implementation process of the proposed failure mode and effects analysis (FMEA) method, in this paper, we take the pallet exchange rack of a horizontal machining center produced by a large CNC machine tool manufacturing company in China as research object
Summary
As one of the six key quality characteristics (reliability, precision, precision life, maintainability, availability and precision stability) of CNC machine tools, reliability plays an important role in the quality improvement of CNC machine tools (Chen et al.). Failure mode and effects analysis (FMEA) (Boral et al, 2020a; Fang et al, 2020), fault tree analysis (FTA) (Hu et al, 2020a), event tree analysis (ETA) (Purba et al, 2020), hazard and operability studies (Marhavilas et al, 2020) and root cause analysis (RCA) (Velasquez, 2020). Among these methods, the FMEA is the most representative one, because it’s main feature is taking actions to prevent the occurrence of failure in advance, rather than improving reliability through post-mortem testing. The rotating hydraulic cylinder is a hydraulic cylinder with buffer device, and when the bracket 4 quickly rotates to the correct position, the buffer device can make the rotating bracket 4 decelerate and buffer automatically
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