A Heat-Stress Finite-Element Analysis Of Roller And Radius Optimization In Continuous Casting Process

In the production process of continuous casting, the roller is mainly used for the support, guidance and straightening. However, because of the complexity of the conditions of cooling and heating, roll’s surface temperature and thermal stress is periodic variation, and easy to cause the roll bonding, cracked equipment problems. In view of this, this study combined with the parameters of a specific process equipment about heavy slab continuous casting machine, and establish the thermo mechanical coupled finite element calculation model with ANSYS, research and analysis of the temperature field and stress field of roll casting roll position distribution, structure, cooling condition, and reached the following conclusions:(1) with the distance from the mould level casting distance increases, the maximum surface temperature of roller and the maximum equivalent stress decreases gradually. The bender rolling section’s highest surface temperature is 618℃, the maximum equivalent stress is 217Mpa; the bow section’s highest surface temperature is 560℃, the maximum equivalent stress is 170MPa; straightening roll the highest surface temperature is 520℃, the maximum equivalent stress is 167MPa; the horizontal guide roll surface temperature at 484.1℃, the maximum equivalent stress of 131MPa.(2) Compared with the different position of horizontal roll. The highest temperature of intermediate segment roller is 74℃ higher than the end part of the highest temperature; the middle segment rolls the maximum equivalent stress than the end of high 22MPa.(3) The temperature of the inner water has a little influence on the temperature field and the stress field. When the inner water different in 20～30℃, the entrance temperature of each increased by 1 ℃, the highest temperature will increase 0.1℃,the maximum stress will increase 0.1MPa.the above temperature’s effect on the thermal crown is so weak, that we can ignore it.(4) The different radius has a big influence on the roller’s temperature field and stress field. When the roll’s diameter unchanged, every increase of diameter 0.01M, the highest surface temperature will increase 7℃, the equivalent stress reduced 4MPa; When the outside roller’s diameter unchanged, and inner increase of diameter 0.01M, the highest surface temperature will rise 3℃, and the equivalent stress will increase 2MPa; When the both radius increase 0.01m, the roller’s temperature will decrease 0.01m, and the equivalent stress will reduce 1MPa.(5) The tortoise crack on the roller’ surface has a closely related with the thermal stress. The thermal stress is very big on the roller’s surface 2～4mm, the thermal strain is very big, so the tortoise crack usually has a depth about 2～4mm.