Papers by Keyword: H-Beam

Abstract: The formulation and solution of the problem of double-T section rolling in universal groove using the variational principle of minimum total power with aim to determine integral forming and energy-power parameters are presented. Geometrical model of the deformation zone and the kinematically admissible velocity field were constructed accurate within two unknowns: forward slip coefficient ν, flange spread (pulling-down) . The comparison of the calculated values with the experimental data obtained on a laboratory mill 200 confirmed that the variational principle of minimum total power has sufficient accuracy for analysis of double-T section rolling in universal groove. The mean statistical error of torque calculation is 12.3 % while load calculation is 18.7 %.

Abstract: Based on application the physical constraint equations of state of stress and strain of the metal for the isotropic medium, we get expressions for components of stress tensor. The new theoretical method for calculation of contact pressures and rolling force during rolling of double-T section in a universal beam groove was developed. Reliability of the method is confirmed by the results of experimental verification for conditions of rolling of H-beam No 35B1, 40K2 and 45B2 from steel 15CrSiNiCu on the universal beam mill of "NTMK". The average calculation error is 6.4%. The new method is recommended for calculation pass design and technological modes of H-beam rolling on rail-beam and section mills, equipped with universal stands.

Abstract: Based on the application of variational principle of minimum total power and statistical generalization production experience procedure for the calculation of roll pass design and process-dependent parameters of double-T section rolling on universal rail-beam mill was developed.With the procedure developed, a computer simulation of rolling of the I-beam 35B2 was performed. It has been shown that the proposed procedure for calculating the calibrations rolls for the I-beam rolling in universal calibers ensures that the effective strain of the profile elements is distributed evenly.The study was made within the project, part of state job in the field of scientific activity No 11.1369.2014/K dated 18.07.2014 (State registration number: 114122470051).

Abstract: Different i nternal microstructure of H –Beam has great influence on the mechanical properties. In order to improve the production technology and improve the mechanical properties of products, H-beam with a residual stress products and without residual stress products are selected and observed by metallographic experiment. The internal microstructure of productions with residual stress and without residual stress are analyzed . The residual stress influence on internal microstructure of H-beam is analyzed.

Abstract: Complex shape of H-beam section and uneven elimination of heat on the section result in too big temperature difference between web and flange. At the same time,as the roller cooling water forms tank on H-beam web, the section temperature difference further increases. Based on finite element analysis software DEFORM-3D, the FEM model of finished product size of H194×150×6×9 is established. Thermo-mechanical coupled method is adopted to simulate the rolling process of H-beam. The cooling water influence on section temperature distribution, equivalent stress and strain distribution is analyzed. The section temperature change characteristic are studied to provide reference for further research.

Abstract: It is difficult to control structural homogenity of H-beam, because of the special section, the metal flowing power is big and the section temperature is uneven. It is expanding strict to the shape of H-beam , dimensional precision and mechanical behaviour. In the process of the metal plastic deform, microstructure transmutation is great effect on the mechanical property. In order to analyse the effect of microstructure on the mechanical property , the tension test is operated and the microstructure effect on the mechanical property is analyzed .

Abstract: Web and flange of H-beam are deformed indifferent zone in the rolling process, so non-uniform deformation is easily generated. In order to ensure the uniform elongation of flange and web, usually , the elongation ratio of flange is 3~5% more than that of web. Web wave or crack often appears. Flange wave, crack even tension fracture often appears. Experiment are designed that the elongation ratio of flange and web are changed to ensure the uniform elongation of flange and web. Thus, the rolling quality of H-beam is improved. The recommended rolling rule is provided, which can provide the accordance for actual production.

Abstract: Because of the residual stress of H-beam after hot rolling, the service performance of H-beam is seriously impacted. it is necessary to reduce the residual stress by controlled rolling and cooling process. In this paper, a continuous rolling model of finish product of H200 x 200 x 8 x 12 is set up. The continuous rolling process of H-beam was simulated using the large finite element software ANSYS/LS-DYNA. The effect of non-uniform elongation of web with flange and section temperature difference on the residual stress are analyzed. Through metallographic observations, the vary microstructure of rolling piece with residual stress and with no residual stress is analyzed. As can be seen from the finite element analysis and the experimental results, reasonable elongation of flange and web and controlling cooling speed to decrease the sectional temperature difference can reduce the residual stress of H-beam.

Abstract: According to the production data of a rolling H-beam factory, the FE model of hot continuous rolling process of H-beam is built. With the FEM software of DEFORM-3D, the continuous rolling of H-beam was simulated. On base of simulation result, the metal flow and deformation law are discussed. Because of the flange and web is deformed in the different deformation zone, the metal flow law of flange and web is complex, especially the metal of the conjunction of flange and web. The exchange of metal between the flange and the web of H-beam alters to the different elongation ratio of flange and web. The other factors which influents on the metal flow , are taken into consideration, such as rolling speed and friction coefficient. By adjustment to the rolling parameters, the defect of the H-beam is reduced.

Abstract: According to the production data of a rolling H-beam factory, the FE model of hot continuous rolling process of H-beam is built. The rolling process of H-beams is simulated by explicit dynamic FEM, and the influence of deformation parameters on the spread of rolling piece is analyzed. The simulation results show that the flange width, elongation ratio between flange and web and flange thickness are the major influencing factors on the spread of rolling piece.