Modal Analysis of Rubber Cylinder of Offset Printing Machine Based on Finite Element Theory
As a key part of the offset press,the rubber drum affects the printing accuracy.Based on the finite element theory,the modal analysis of rubber drum of offset press is presented in this paper.First of all,the drum is modeled geometrically with Solidworks,and the static characteristics and vibration characteristics are analyzed in Ansys software,and the stress,strain cloud diagram,natural frequency and mode shape diagram are obtained.Static analysis shows that the maximum equivalent stress value is 280.61MPa,which is less than the ultimate yield strength of 370MPa,which meets the requirements of practical application.The results of modal analysis show that the first three steps of the drum are mainly bending deformation in the middle of the drum,and the maximum vibration mode mainly occurs in the middle part.The torsion bending deformation of the last three drum,the maximum vibration type mainly occurs at both ends of the drum and the shaft head.The first natural frequency of the rubber drum is 380.08Hz,which is much lower than the critical speed of the rubber drum,and provides a basis for the reliability analysis of the rubber drum of the offset press.
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