Analysis of Structural Vibration Characteristics of Large Tonnage Closed Type Crank Press
The vibration of the press body will directly affect its performance,the service life of the die and the machining quality of the parts.In order to deeply understand the vibration characteristics of large tonnage press,the prestressed mode analysis of 32.5 MN closed type crank press was taken as the research object,the corresponding natural frequency and vibration mode of the machine tool were obtained,and some improvement measures were put forward.The dynamic strength and stiffness of machine tool column subjected to impact load were studied by combining measurement and simulation.On the basis of verifying the accuracy of the finite element mod-el,the acceleration response of the beam,slider and workbench of the press was analyzed.The results show that the first order natural frequency of the press is much higher than its operating frequency,so there is no resonance.When subjected to 25 MN impact load,the compression of the press column is released to a certain extent,and the stress and displacement of the column are reduced,and the change of the inside of the column is more obvious than that of the outside,but all can recover stability in a short time.The acceleration of each position is slider,beam and workbench respectively from the largest to the smallest.There is a peak frequency of about 25.8 Hz at each point,and the vibration gradually attenuates in the process of transmission from the position close to the vibration source to the far from the vibration source.
万方数据
维普
