| Fatigue damage of engineering structures and mechanical equipment is the mostcommon form of destruction The damage of most main parts of hydraulic press arefatigue damage under many times of alternating load. As one of the main components of800MN large die forging hydraulic press, the frame adopts combined C shaped plate andpreloading structure and endures heavy load in the work. So when designing the frame,not only the strength and stiffness, but also the reliability should be guaranteed.Using the large nonlinear finite element analysis software MSC.Marc, thedeformation and stress distribution of the major components were analyzed in thepreloading and working state. The dangerous points in the frame were determinedaccording to the results.Taking 800MN hydraulic die forging press machine frame as the prototype, the testframe was designed according to the proportion of 1 to 30. The stress of the dangerouspoints were gained through the static loading test, verifying the results of the numericalsimulation and giving a basis for the reliability designing of 800MN hydraulic press.Based on the results of the static finite element analysis, the fatigue life of the framewas analyzed, using the fatigue analysis software MSC.Fatigue, and combining with thenominal stress method and Miner linear cumulative damage theory. The predicted lives ofthe main components were gained. The laws of the influence of the factors on the framewere revealed, such as working load, preload, average stress compensation method,survival rate, notch coefficient, processing and surface treatment method. |
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