Method for reducing steel belt running deviation of continuous annealing and coating machine set

Abstract

The invention discloses a method for reducing steel belt running deviation of a continuous annealing and coating machine set, belonging to the field of metallurgy. The method comprises the following steps: when entrance welding is performed, stopping an uncoiling machine; when the loop length is reduced to 15% and a welded seam is fed in a furnace, lifting the uncoiling machine to recover operation, and enabling a furnace section to operate at constant speed normally; when the uncoiling speed is higher than the speed of the furnace section, performing loop charging operation, charging the loop length to be 35% of the total loop length, then stopping the loop charging operation, and keeping that the uncoiling speed is consistent with the speed of the furnace section to perform normal operation; when 200m of the steel belt is left on the uncoiling machine, restarting an entrance loop to perform the loop charging operation, wherein the maximum change amount of the loop length is not more than 25%, and the entrance loop tension is 14N / mm<2>; and until a welding operation needs to be performed, repeating the operations after the entrance welding ends. By adopting the method disclosed by the invention, the deviation degree of strip steel in the entrance loop can be effectively reduced, the friction force of the strip steel to a supporting roller of a loop trolley can be increased, the deviation speed of the strip steel can be reduced, and the running deviation edge rolling rate of the machine set can be reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for reducing deviation of a steel strip of a continuous annealing coating unit. Background technique [0002] The continuous annealing and coating unit undertakes the tasks of cold silicon degreasing, annealing and coating. Generally, the raw material coils are uncoiled first, welded with the forward strip steel, and then enter the process section for processing. After the process treatment is completed, they are cut at the exit section and rolled into finished coils by the coiler. However, the entrance section cannot always keep running at the same speed as the process section due to the changing operations such as uncoiling, head cutting, tail cutting and welding of the raw material coil. Therefore, an entrance looper is set between the entrance section and the process section to store a certain A large amount of strip steel can be used to ensure that the change...

AI Technical Summary

Problems solved by technology

When producing 1200mm wide rolls, the pull edge of the inlet loop seriously affects the normal operation of the unit