The Numerical Simulation Of Dhcr Process In Temperature And Stress Field And The Second Development

With the development of steel industry, continuous casting-hot charge rolling and"hot send direct rolling" technology have become the new target level to measure level of iron and steel production technologies, billet hot charging has increased productivity, reduced energy consumption and reduce the role of oxidation loss slab production.Practice indicates that the temperature in hot charge of 600℃, hot charge than 50%, hot rolling heating furnace productivity increased by about 30%, reduce energy consumption by about 20%. However, because of the shortage knowledge of steel properties,with the rate increased in continuous casting-hot charge rolling, product defect gradually increased including serious, or even scrapped problem, causing huge economic losses.In this paper, in study with hot charge rolling process of The second hot rolling plant in WISCO, With comprehensive consideration of thermal properties of nonlinear parameters, Thermal conductivity and convection heat transfer coefficient change with temperature, use large finite element analysis software ANSYS, and Using VB to establish the secondary development interface of ANSYS to simulate the stress field and temperature field of the slab.VB created secondary development interface of ANSYS, enter the appropriate parameters needed to simulate the temperature field, stress field. Comparison temperature and stress fields of slab Air cooling and the slab heap cooling, using the Equivalent heat capacity method to treat latent heat effect on the temperature field. Obtained in a separate air-cooled, and heaps of cold stress in both cases the surface of the curve. Through measured the temperature the site with infrared thermometer on slab of separate air cooling, and it basic equal to simulated results, Verify the validity of the model and methods to establish the correctness of using; through on-site sampling to thermal Simulation simulation experiment, measured selected steel kind ultimate tensile strength and area reduction rates and measured by dilatometer curve of its expansion, contrast found in the separate case of air cooling the surface stress exceeds the tensile limit, and in the heap cooling surface of the tensile stress does not exceed the limit.In the heating stage, to simplify handling of simulation, to simulate the stress conditions at different core temperature and at different surface temperature combination so as to arrive at what combination of surface temperature and core temperature when the cracks is not appear.