Control method for stopping reversible cold-rolling mill

Abstract

The invention relates to a control method for stopping a reversible cold-rolling mill and belongs to the technical field of automation control for rolling. The method comprises the following steps: setting a strip coil outlet thickness and a rolling mark distance for each-pass rolling; by starting from the second-pass rolling, calculating a rolling mark height and a comparison value of the rolling mark height for each-pass rolling; by starting from the second-pass rolling, reading the strip coil outlet thickness and an actual value of the strip coil outlet thickness for each-pass rolling by arolling control system, and after comparing, acquiring a strip coil outlet thickness deviation for each-pass rolling; after comparing the strip coil outlet thickness deviation and the comparison value of the rolling mark height, calculating an actual displacement of the rolling mark at real time or starting the parking timing by the rolling control system; calculating a rolling mark parking displacement or a parking delay at real time by the rolling control system; and when the actual displacement of the rolling mark is equal to the rolling mark parking displacement or the parking timing reaches the parking delay, controlling the rolling mill to park at each pass by the rolling control system. The method can be used for precisely positioning the strip tail position of each pass rolling strip coil of the reversible cold-rolling mill, so as to increase the yield of strip coil rolling.

Description

technical field [0001] The invention relates to a method for controlling the parking of a reversible cold rolling mill, belonging to the technical field of steel rolling automation control. Background technique [0002] The reversing cold rolling mill is used to roll the hot-rolled strips into cold-rolled strips through several passes of reciprocating rolling. Taking the single-stand reversing cold rolling mill as an example, the configuration of its main process equipment is as follows: figure 1 As shown, the rolling process is generally as follows: send the hot-rolled strip coil into the uncoiler 1 and then prop up the coil, the uncoiler 1 rotates at the strip threading speed, and the strip head passes through the rolling mill 2 and enters the coiler 4 through the steering roller 3 Clamped, after the end of strip threading, adjust and set the roll gap and tension of rolling mill 1, and then start the first rolling pass. When the tail of the strip is detached from uncoiler...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned method of parking and positioning by the length of the coil is feasible in principle, but in practical applications, there are the following disadvantages: since the length of the coil per pass can reach hundreds of meters or more than kilometers, for such a length of coil For accurate tracking, the allowable error range of tracking is obviously too large for the accuracy required for parking positioning; in addition, affected by factors such as coil slipping and belt threading under reverse tension-free conditions, the accuracy of calculating the length of the coil is often not accurate. High, resulting in low positioning accuracy of the reversing cold rolling mill parking, and even affect the normal rolling

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