Ring Rolling Casting Modeling And Simulation Of Complex Forming A Multi-field Coupling

Along with the ring parts are widely used in the fields of high grademachining industry，aerospaceing industry，national defense manufacturingindustry and so on. The demands and requirements of ring parts，especially forlarge and ultra-large flange and bearing ring，are increasing progressively. Theprimary purposes of ring part manufacturing industry are the researches of lowcost，high efficiency，energy conservation and emission reduction. The subject issupported by the Key Program of National Natural Science Foundation of China(NO.51135007). The macroscopic deformation analysis of casting and rollingcompound forming process based on the platform of finite element softwareABAQUS is the key problem to solve. This work lays the foundation forrealizing microstructure evolution mechanism visualization of ring parts byusing cellular automata modeling method，obtaining good overall dimension，accuracy requirement，internal organization and mechanical properties of ringparts.Taking as-cast42CrMo steel as a research object，the subject makes themodeling method and the macroscopic forming law42CrMo analysis of theas-cast42CrMo steel ring casting and rolling compound forming process basedon ABAQUS software as the main research contents. Based on the parametersscope of ring casting blank rolling theory and the as-cast42CrMo stress-straincurves under different deformation condition (deformation temperature is from850°C to1150°C，strain rate is from0.05s-1to5s-1and the largest true strain is0.7) obtained by thermal simulation testing machine Gleeble-1500D，LAASRAOUI two KNN method is adopted to establish the flow stress model，aVUMAT subroutine is written to calculate，and as-cast ring blank hot rollingforming numerical simulation is realized based on ABAQUS software.From the actual rolling theory and a large number of numerical simulationresults，the as-cast ring blank hot rolling process，the distribution and evolutionlaw of the equivalent strain，temperature，rolling force and rolling torque of theforming parts，the influence of process parameters on above distribution， evolution law and strain and temperature uniformity of ring are obtained. Itmeans that the greater the core roller feeding speed，the more uniform of theequivalent strain and temperature distribution in forming parts. The greater thebillet initial temperature，the better equivalent strain uniformity，the worsetemperature uniformity. The friction coefficient does not have big influence onring forming uniformity. It provides the platform for modeling the compoundmodel of micro-scale model and the macro finite element model by use ofcellular automata method， realizing microstructure evolution mechanismvisualization of ring parts.