Modeling of Plastic Deformation Mild Steel Bloom ASTM [A36] Under Hot Rolling Mills

Abstract

To predict the distribution of stress and strain fields in hot rolling process the computer models were built using thermo-mechanical coupling rigid-plastic FEM. In metalworking, rolling has been analysis of strain-stress and temperature states during hot rolling process for bloom in which metal stock is passed through a two high stand Pair of rolls. This work studied the effect of rolling parameters at different rolling temperatures, on the mechanical properties of hot rolled mild steel. It’s a technique in which a material having relatively large thickness geometry is plastically deformed in one or more sequential operations and transformed into a useful part, without change in the mass or composition of the material. Plastic deformation, finite element method, the hot rolling process is simulated and analyzed. The rollers and bloom are represented by respectively rigid and deformable bodies, and 3D models were developed for both. This thesis was carried out to study the rolling within the hot rolling aiming to evaluate 3D FEA and thermo-mechanical boundary condition subsequent saw change on the bloom thickness during deformation process. The applied conditions are extremely important in order to achieve the desired quality product. Successful hot rolling would be dominated by calculating the effect of some important parameters on the work piece during the deformation processes. In this thesis the hot rolling would be carried out to predict effects of temperature on the strain and stress distribution would be discussed in detail using the finite element method application. The model would be developed by considering all of the non-linearity of material, geometric, boundary, and heat transfer that present in the rolling processes. This simulation results are verified by the experimental data of stress vs. Strain curve. In this paper, the analysis of the 3D strain state for the hot rolling process of bloom mild steel with the application of the finite element method is presented. The results of work connected with the simulation of metal flow scheme, and fields of stress, strain and temperature in the material deformation process in the rolling conditions are presented. The distribution of the effective strain, the stress on the surface of rolling cross sections is determined. Rolling speed is an important parameter for hot rolling, since this factor directly controls the strain rate, flow stress, heat of deformation and heat transfer coefficient. Rolling speed is a variable that it has great effect on heat transfer, flow stress, meshing size