| 摘要 |
PURPOSE:To stabilize the operation through preventing the strip from running off hearth rolls in varying widths of strip for annealing by constituting a number of hearth rolls in a furnace with different forms of trunk contour in an annealing process of strip in a continuous annealing furnace. CONSTITUTION:In a continuous annealing furnace having a number of hearth rolls, a hearth roll for narrow-width strip 11 and a hearth roll for wide-width strip 12 are arranged alternately in each roll or in every 2-3 rolls. In these hearth rolls, the rolls having bulging form on its trunk part 8 are used, wherein the difference (L-W) between a trunk length of the roll L and width of strip W is 200-250mm. and the maximum diameter D of the trunk 600-2,000mm.. In a roll having a flat part 9 in its trunk 8, the length of this parallel part 1 is 0.3-0.8 times of the trunk length L and the difference (D-d) between the horizontal part diameter D and minimum diameter d 0.5-6mm.. In a roll having a crown on its trunk 8, the difference between the maximum radius and minimum radius of curving part, delta, (D-d)/2, is 0.1-3mm.. |
