Failure evaluation of coffee maker

The coffee maker was disassembled, and the characteristics, working principle and process of each unit and component were investigated in this paper. The response of the system under abnormal operation conditions was found through simulating test. And the failure modes of each unit failing in the test were analyzed based on the characteristics of material, structure and service condition. The failure evaluation of the coffee maker system was made using the reliability analysis methods such as failure mode and effect analysis, fault tree analysis etc. The results show that the coffee maker can basically meet the demands for functionality. However, the hidden hazard caused by design exists for the pressure relief pipeline, which needs further improving. Inflammation and explosion etc. can hardly occur to the coffee maker, but leakage of steam may take place, which should be avoided. The quality of some units in the coffee maker are poor, which is detrimental to safe use of long term, and improved processing are needed.