Study On Deformation And Fatigue Life Of The Universal Mill Roll Based On Thermal Stress Analysis

Roll ring as the main tool production, rolling plastically deformed in the pressing roller,rolling production is the major consumable component. Rolls in hot rolling production withstandcyclical temperature and rolling force alternating load, making the roll pass changes occur, while inthe case of long-term work, roll internally generated cycle alternating stress and strain, resulting incumulative damage roll material cracks, when the stress concentration or strain concentration,crack propagation and fracture fatigue failure of the roll.A steel H-beam universal rolling mill rolls a serious cracks and thermal deformation, seriouslyaffecting the quality of the steel, while the actual production of a security risk. To determine theeffects of thermal stress and deformation of the roll life on paper based on elasticity andtemperature and mechanical coupling analysis method was studied by numerical simulation,specifically a study by the following aspects：First, by using ANSYS finite element software to build a three-dimensional solid model ofuniversal rolling mill rolls, and then set the material parameters of the solid model with eight-nodehexahedral element mesh discrete and finite element model of the roll. Secondly, the temperaturefield rolls finite element analysis. APDL language prepared by adding to a cyclic boundaryconditions roll process, assuming the roll does not rotate, so the boundary condition around theroller to rotate the analog conversion of the roll itself, a stable temperature field distributionobtained rolled state. The results obtained with the rolling force coupling analysis, obtained stressfield and changes in steady roll rolling state. Finally, the coupling analysis based on thermal andpower to get the roll load time histories, using ANSYS/Fe-safe software to set the relevantparameters and material fatigue characteristic curve drawing, see the fatigue life of cloud passedANSYS processor to determine the risk structure section. Based on the temperature and forcecoupling analysis, the results of fatigue life improvement program proposed roll structure, and thestructure of the improved thermal and mechanical coupling analysis and fatigue life prediction, theresults showed the stress of the original366MP roll down to290Mpa, the maximum deformation of the roll is reduced5mm, and significantly improved the fatigue life, the feasibility ofimprovement programs.Through research and simulation analysis conditions, gets the thermal stress roll deformationand fatigue are the main reason. In this paper, heat transfer basis by thermal coupling analysis,temperature and stress fields and the distribution of the roll deformation, using ANSYS/FE-SAFEpredicted analyzed fatigue life rolls based on the cumulative fatigue damage theory, to improveproduct quality and the prevention of accidents have important theoretical guidance. Meanwhileroll through structural improvements can effectively improve product quality and reduce rollconsumption．...