| The mechanical press is a forging machine driven by a crank connecting rod or a toggle mechanism,a cam mechanism,and a screw mechanism.With the development of large-scale and heavy-duty machinery manufacturing equipment,higher requirements have been placed on the functions,load-bearing capacity,life and reliability of mechanical presses.Studying the fatigue life and reliability of the mechanical press not only ensures the safe use of the press,but also improves the working performance of the press by improving the mechanism of the press and its components.In order to ensure the safety of the mechanical press and reduce the cost,this paper mainly studies the key issues of the upper beam structure design and fatigue life analysis of the mechanical press.The main tasks completed are as follows:(1)Upper beam structure modeling and static analysis.Inventor is used to construct the upper beam geometric model,then the finite element model is established in ANSYS Workbench,the material and boundary conditions are set and static analysis is carried out,and the stress and strain calculation results are obtained,and the results are analyzed accordingly.(2)Fatigue life analysis of the upper beam.The correspondence between the mechanical parameters and the life of the material under asymmetric cycle is derived,and the finite element analysis of the upper beam is used to calculate the life of the critical component with a reliability of 99.9%.(3)Optimization of the upper beam structure considering reliability.According to the life of the upper beam,the maximum stress corresponding to the life when the component reliability is 99.9% is derived.With the maximum stress as the constraint and the minimum component volume as the target,the material is removed according to the topology optimization result,and the model is re-modeled and optimized. |
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