Prioritization of forging die design criteria based on failure analysis using fuzzy analytic hierarchy process (FAHP)

Design of forging dies involves various design criteria starting from selection of material to finisher design. These design criteria decide the failure and life of the dies. So, for better design of dies it is sometimes inevitable to prioritize one design criterion over other. In general, the prioritization is done based on the expertise of the design engineer which is not always reliable. So, it is important to decide which criteria is preferred over the other. The prioritization of criteria can be done using analytical methods. In the present work, the design criteria are prioritized using analytical hierarchy process (AHP). The prioritization is further improved by fuzzification (fuzzy analytical hierarchy process – FAHP) to included intermediate value which were not considered during AHP. The ranking obtained by AHP and FAHP are compared with the traditional Failure Mode and Effects Analysis (FMEA). It is observed that the prioritization of criteria obtained from FAHP in conjugation with impact factor ‘I’ is superior to the prioritization obtained from traditional FMEA. The ranking result shows that the obtained result is more practical for forging die design as compared to traditional FMEA result. © 2022