01-08-2017, 02:51 PM
Fault mode analysis is important in the CNC machine tool. In order to evaluate the failure mode of the CNC machine tool, this work described a new fuzzy FMEA model that integrates with the diffuse linguistic scale method. The model proposed a space-risk diagram to explain the S, O, and D ratio. Based on the risk-space diagram, the risk priority number is calculated using the weighted Euclidean distance formula and the centroid defuzzification based At the Alpha level. This study is used to analyze a type of CNC lathe. In comparison with the criticality ranking of a similar type of CNC lathe, the risk classification of the FMEA model revealed that the method is basically the same with the real situation. The results indicated that the diffuse FMEA used around CNC is a reasonable method corresponding to manufacturing, and is a valid basis for building reliability design model or manufacturing support control plan.
A Failure Mode and Effect Analysis (FMEA) is a systematic method to identify and prevent product and process problems before they occur. FMEA focus on defect prevention, improve safety, and increase customer satisfaction. FMEAs are carried out in the product design or process development stages, although carrying out an FMEA in existing products and processes can also produce substantial benefits. FMEA is precisely an analytical methodology used to ensure that potential problems have been considered and addressed throughout the product and process development cycle. It is essential to analyze the process before implementing and operating the machine. In this work, the effect of the failure mode of the process and the analysis of the final milling process is performed. A series of final milling processes is performed on various workpieces and any failures and defects in the workpiece and tool are studied. These are classified based on FMEA, the risk priority numbers are assigned to each and multiplying the ratings of occurrence, severity and detection. Finally, we find the most risky failure according to RPM numbers and tabulate the cause and effects together with the preventive measures. This work serves as a fault prevention guide for those who perform the final milling operation towards effective milling.
A Failure Mode and Effect Analysis (FMEA) is a systematic method to identify and prevent product and process problems before they occur. FMEA focus on defect prevention, improve safety, and increase customer satisfaction. FMEAs are carried out in the product design or process development stages, although carrying out an FMEA in existing products and processes can also produce substantial benefits. FMEA is precisely an analytical methodology used to ensure that potential problems have been considered and addressed throughout the product and process development cycle. It is essential to analyze the process before implementing and operating the machine. In this work, the effect of the failure mode of the process and the analysis of the final milling process is performed. A series of final milling processes is performed on various workpieces and any failures and defects in the workpiece and tool are studied. These are classified based on FMEA, the risk priority numbers are assigned to each and multiplying the ratings of occurrence, severity and detection. Finally, we find the most risky failure according to RPM numbers and tabulate the cause and effects together with the preventive measures. This work serves as a fault prevention guide for those who perform the final milling operation towards effective milling.