Rough mill force balance control (RMFBC) method for two sides of hot rolled strip steel reversing rough mill

Abstract

The invention discloses a rough mill force balance control (RMFBC) method for two sides of a hot rolled strip steel reversing rough mill. The method is provided according to the difference of rigidity coefficients of the two sides of the hot rolled strip steel rough mill, and horizontal regulating quantity of roll gaps on single side or two sides of the mill is accurately calculated by using related parameters of the field rough mill as input. The regulating quantity is subjected to amplitude limiting in a dead zone and control of a proportion integration (PI) controller and then transferred to a servo valve, and the travels of hydraulic cylinders on two sides of the rough mill are adjusted, so that mill force balance of the two sides of the mill is realized. The method is easy to operate, and can relieve or eliminate camber or wedge-shaped defects of strip steel.

Description

technical field [0001] The present invention relates to the automatic control technology of the production line of hot-rolled steel strip and hot-rolled plate, and in particular relates to a kind of dynamic rolling force balance in the production process of strip steel, so as to slow down or eliminate the sickle of intermediate billet or strip steel. The automatic control method of bending and wedge shape can meet the requirements of good shape of intermediate billet or thick plate. Background technique [0002] In the rolling mill roll gap setting process, it is generally considered that the stiffness on both sides of the rolling mill is the same, and thus the set roll gap value of each rolling pass is given. However, in the process of rolling mill archway manufacturing and mechanical design, it is impossible to ensure that the stiffness on both sides of the rolling mill is exactly the same, and the transmission side of the rolling mill is connected to the coupling shaft, w...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the difference in stiffness coefficients on both sides of the rolling mill, which leads to unbalanced rolling force on both sides of the rolling mill, resulting in camber and wedge shape problems of the intermediate billet, basic research has been carried out at home and abroad, but there are few public technical methods

For example, the patent No. CN 101992220A discloses a technology of "controlling the stiffness of the rolling mill stand", but this method only considers that the stiffness coefficient of each pass of the rolling mill will change, and does not involve the stiffness of the working side and the driving side of the rolling mill. difference, that is, it is considered that the stiffness on both sides is equal at the same moment; for example, the patent No. CN 101934292A discloses a technology of "automatic control method for camber and wedge shape of hot-rolled strip roughing mill", but this method also considers that the rolling mill The stiffness coefficients on both sides of the stand are equal; as described in the articles "The effect of the difference in stiffness on both sides of the rolling mill on the thickness deviation on both sides of the hot-rolled wide and thick plate" and "The effect of the difference in stiffness on both sides of the medium and heavy plate mill on the roll gap setting" method, the former needs to add a set of DCS and PLC system on the basis of the original equipment, and the latter needs to install a thickness gauge device, which increases the investment cost, and the two methods are suitable for wide and thick plate and medium plate products, not for thin plate and strip products

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