Method for controlling strip-steel edge drop of tandem mills

Abstract

The invention provides a method for controlling strip-steel edge drop of tandem mills. The method comprises that: a, an edge drop instrument is arranged in front of a tandem mill; b, when strip steelpasses through the edge drop instrument, a PLC controller determines a sampling length according to the position of the edge drop instrument in the length of a whole roll of strip steel, and the edgedrop instrument acquires data of strip-steel edge drop on two side parts of the sampling length, calculates a preset value of leap position of a leap work roll of the tandem mill within the sampling length, and stores the value, thus the PLC controller finishes determining the sampling length, calculating and storing the preset value of the leap position of the leap work roll of the tandem mill within the sampling length, and then finishes determining next sampling length, calculating and storing the preset value of the leap position within the next sampling length in sequence; and c, when each sampling length passes through the leap work roll of the tandem mill, the PLC controller controls the leap work roll to leap on the strip steel within the sampling length according to the preset value of the leap position within the sampling length. The method has the advantage of realizing high-precision control of strip-steel edge drop.

Description

technical field [0001] The invention relates to strip steel rolling technology, in particular to a strip edge control method for a continuous rolling mill. Background technique [0002] Edge drop (edge ​​drop is the thinning or thickening of the thickness of the edge of the strip relative to the thickness of the middle area) is an important section quality index of the plate and strip, and it is also an important index that directly reflects the physical quality control level of a tandem cold rolling mill. Especially for the electrical steel products produced by the full continuous cold rolling process, the quality level of the edge drop control will directly affect the stability of the end user during the punching process and the quality of the lamination coefficient after punching, and also determine the quality of the continuous In the rolling production process, the design size of the trimming amount in the production process, so the pickling mill can effectively control...

AI Technical Summary

Problems solved by technology

[0006] 2) This kind of edge drop control uses feedback control as the main means, but the physical distance of the edge drop instrument at the exit of No. 1 rack to No. 5 rack is nearly 20m, which makes the feedback control lag behind, and the short-term change of the edge thickness of hot-rolled strip The adjustment effect is not obvious, and there may even be control disorder

[0007] 3) In the actual production, the crown of the hot-rolled strip varies greatly, and the feedback control and adjustment means are limited. It often occurs that the work roll moves to the upper limit, and the edge drop of the strip at the exit of the rolling mill appears out of tolerance, which affects the product performance.

[0008] Therefore, the existing strip edge drop control method is not accurate enough to control the thickness of the strip edge, which directly affects the performance of the strip, and also affects the yield of the strip produced by the unit.

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