Loop control method and rolling method of hot rolling mill

Abstract

The invention discloses a loop control method and a wide and thin specification rolling method of a hot rolling mill. The loop control method comprises performing a loop raising process of a loop after the frame adjacent to the downstream of the loop bites steel; after the loop raising process is completed, performing a constant-tension control process of the loop; before the frame adjacent to the upstream of the loop releases the steel, performing the looping process of the loop. The loop-raising process of the loop comprises, after the frame adjacent to the downstream of the sleeve bite the steel, adjusting the angle of the loop to a loop raising angle; through non-linear control, adjusting the angle of the loop from the loop raising angle to a set angle which is greater than the loop raising angle; through micro-tension control, adjusting the angle of the loop from the loop raising angle to a working angle which is greater than the set angle.

Description

technical field [0001] The invention relates to a looper control method of a hot rolling mill and a rolling method for the hot rolling mill. Background technique [0002] The finishing looper of the hot rolling mill is the key equipment to keep the strip rolled stably in the finishing stand. Due to the large amount of deformation and the rolling force close to the limit of the equipment, the thin gauge is more likely to be affected by small changes in the rolled piece or the small disturbance of the rolling mill itself, and the untimely regulation and other damages to the rolling stability. The instability of the looper may cause the strip to deviate , Narrowing, crushing, rolling waste, and tailing phenomenon, so stricter requirements are put forward for the rolling control production process between each stand of the finish rolling. [0003] For traditional hot-rolled strip mills, Kawasaki Steel Corporation of Japan is the first in the world to develop a set of fully cont...

AI Technical Summary

Problems solved by technology

In order to keep the final rolling temperature, it can be solved by increasing the exit temperature of rough rolling. However, increasing the exit temperature of rough rolling will bring about problems such as the decrease of strip surface quality and the increase of energy consumption, which has a certain limit.

Improving the strip threading speed of hot strip rolling will have

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