| Wire and rod rolling products are widely used in industry, agriculture, national defence industry and civil. To resolve problem for shape precision and mechanical properties, as well as to develop more grades of products, computer simulation technique is urgently required. With the aid of the technique, we can achieve the optimum of hot rolling schedules and improve the quality of products by simulating wire and rod rolling process, predicting microstructure and property of products.Considering the producing practice of wire and rod continuous rolling mill of Northeast Special Steel Group Corporation, GCr15 steel is selected as the study object. 3D models of the wire and rod continuous rolling are established using large deformation thermo-mechanical coupled FE theory. A new technology is introduced which simulate every section respectively and transfer the calculation results of previous model to the next model using subroutine module of softeware-MSC.Marc.A technology of controlling the rigid body to push forward the deformable body is also adopted in the models. In the thesis, the simulation of 8 mm GCrl5 wire and rod rolling process coming from heat furnace to finishing rolling is performed.The calculated results of temperature, the equivalent plastic strain and the equivalent plastic strain rate relevant to GCrl5 steel continuous rolling process are obtained. The predicted results of temperature agree well with the measured results.The work is practically valuable and theoretically significant.The models of microstructural changes developed earlier are reviewed in the dissertation. Both 2D rolling model and 3D rolling model are setup in order to predict microstructure and properties. On the basis of the rolling models, microstructural evolution during low carbon steel 6-pass strip rolling process and wire and rod 6-pass rolling process is simulated. With the aid of subroutine module of softeware-MSC.Marc, microstructural changes and recrystallization behavior of low carbon steel during rolling process are studied by coupling grain evolution model of C-Mn steel with thermo-mechanical simulation. |
