Research on thickness distribution rule of intermediate slab during hot strip rolling

Due to the restriction of environment and the measuring methods, the real-time online accurate measurement of the thickness of intermediate billet has not been realized, which affects the final thickness accuracy and the stability of strip penetration in finishing zone. To solve this problem, the reason for thickness deviation of intermediate billet was discussed by means of rolling characteristic analysis during hot rolling. In order to describe the influence of various factors on the thickness deviation, the temperature and thickness distribution along the length direction of the intermediate billet was calculated by the influence coefficient method, a three-dimensional dynamic thermo-mechanical coupling finite element model was established, and the finite element results were compared with the calculated results. The results show that as the rolling process progresses, the temperature of intermediate billet decreases gradually along the rolling length direction, and the average deviation of the temperature of head and tail is about 22 ℃, and the maximum temperature deviation of head and tail is 32 ℃. Due to the temperature deviation, the thickness of the intermediate billet tends to be thicker. The thickness deviation of the intermediate billet head and tail is 0.200 mm, and the maximum thickness deviation of the length direction is 0.53 mm. The obtained thickness and temperature distribution of the intermediate billet can provide the premise for the subsequent fine rolling process and provide basis for the high precision thickness control and the stability of the strip penetration. © 2023 Central South University of Technology. All rights reserved.