A method for preventing middle roller table strip from rising

Abstract

The invention relates to a method for preventing strip steel from rising up in an intermediate roller table, and belongs to the technical field of steel rolling in the metallurgical industry. The technical solution is: operate according to the following steps: (1) Calculate the starting amount △L, that is, L2‑L1; (2) Calculate the starting rate e, e=△L / L; (3) Calculate the rough rolling mill Frame cascading speed correction coefficient g, (4) Use the correction coefficient g to correct the rough rolling final frame speed: when it is judged that the intermediate roller table strip is pulled up and the rough rolling final frame cascading speed correction coefficient g is calculated, in Before correcting the rack speed of the rough rolling mill, check the upper and lower limits of the correction coefficient g. The correction coefficient g after the limit check is multiplied by the speed setting value of the rough rolling mill stand to reach the new speed setting, which is used to adjust the rough rolling mill end. frame, so as to prevent the middle roller strip from rising. The beneficial effect of the invention is that: through the logic algorithm, the strip-up condition of the intermediate roller table is judged, and then the speed of the rack at the end of rough rolling is corrected, so as to achieve the purpose of preventing the strip-up of the intermediate roller table.

Description

technical field [0001] The invention relates to a method for preventing strip steel from being pulled up in an intermediate roller table, and belongs to the technical field of steel rolling in the metallurgical industry. Background technique [0002] In the field of steel rolling technology, especially in the production process of short-flow hot rolling, the head of the strip comes out of the rough rolling stand, passes through the intermediate roller table, and enters the finishing mill. The rolling mill is in continuous rolling state. At this time, the strip steel on the intermediate roller table needs to ensure stable tension and second flow to ensure the stability of the rolling process. However, due to the continuous changes of rolling speed, rolling state and other conditions, the strip steel on the intermediate roller table will rise. If the sleeve is serious, it will cause the strip steel to accumulate in the finishing rolling inlet stand, which is extremely unfavora...

AI Technical Summary

Problems solved by technology

[0004] (1) The accuracy of tension calculation is low, and it cannot reflect the actual tension of the strip length, especially in the second half of the strip, often the calculated tension has reached the set tension, but the actual strip phenomenon occurs;

[0005] (2) The method of manually identifying strip sheathing in the middle roller table lags behind seriously. When the operator recognizes the strip sheathing, the amount of strip sheathing is often already serious, and the interpretation of strip sheathing by different people is inconsistent. There is a certain difference, and the recognition accuracy is not high;

[0006] (3) After the operator recognizes the strip sheathing of the middle roller table, it generally uses manual intervention on the speed of the rough rolling end stand to suppress the sheathing of the strip steel. The manual intervention control effect is poor, and there are problems of insufficient intervention and excessive intervention. Insufficient intervention If the phenomenon of strip sheathing cannot be improved, excessive intervention will lead to excessive strip tension in the middle roller table, which will eventually lead to strip narrowing and product width quality problems

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