Method to Eliminate Rolling Force Fluctuation After Roll Shifting in Rolling Mill

Abstract

The invention discloses a method for eliminating rolling force fluctuation after roll shifting of a rolling mill. The method for eliminating the rolling force fluctuation after the roll shifting of the rolling mill comprises the following steps of receiving the roll shifting amount of strip steel, enabling a shifting roller L1 to be set to be at a setting position according to a shifting roller L2 and enabling the shifting roller L1 to shift first distance towards a working side excessively, to reversely shift the first distance towards a transmission side after the positioning is achieved and finally shift back to the setting position. According to the technical scheme, the method for eliminating the rolling force fluctuation after the roll shifting of the rolling mill has the advantages of overcoming roll shifting direction influences to the roll system vertical direction size when states of a device are changed, eliminating jump or fluctuation of the actual press force or the press force deviation in different roll shifting directions, guaranteeing self-learning stability of a press force model and steady of belt penetrating, enabling relative positions of roll system devices to be basically fixed, being small in the forecast deviation between the actual press force and the press force model and guaranteeing stability of the press process.

Description

technical field [0001] The invention relates to the automatic control technology of steel rolling, and more specifically relates to a method for eliminating fluctuations in rolling force after roll shifting in a rolling mill. Background technique [0002] The structural forms of conventional hot rolling finishing mills mainly include ordinary four-high mills, PC (crossover) mills and roll-shifting mills, of which roll-shifting mills include CVC and WRS (flat roll transmission), and CVC mills are mainly used to control plate convexity. The work rolls usually have a certain roll shape, and the work rolls of the WRS mill are usually flat rolls, which are mainly used to even the edge wear of the rolls, reduce the edge drop of the strip, and improve the cross-sectional shape of the strip. Increase the number of kilometers with the same width. [0003] like figure 1 As shown, the roll shifting mill only shifts the upper and lower work rolls, but the backup rolls do not. In a pl...

AI Technical Summary

Problems solved by technology

Whenever the roll shifting is reversed, the actual rolling force will change abruptly. In order to adapt to the sudden change of the actual rolling force, the rolling force model performs continuous periodic self-learning, which leads to periodic fluctuations in the self-learning coefficient of the rolling force model

Therefore, whenever the roll shifts in the opposite direction, the prediction deviation of the rolling force model is very large, the set amount is large, and the rolling stability is very poor, which increases the risk of rolling breakage or scrap

[0014] On the other hand, after the roll shifting is reversed, due to the great uncertainty in the state of the contact surface between the back-up roll chock and the stepped backing plate, sometimes the deviation of the rolling force on both sides will be abnormal

[0015] When the shifting roll shifts to the driving side, the rolling force deviation between the working side and the driving side is small, and when the shifting roll shifts to the working side, the rolling force deviation between the working side and the driving side is large, and the rolling force The stability of the control is poor, and accidents such as deviation and scrap steel are prone to occur

[0016] Since the production environment of hot rolling is relatively harsh, and the structure of the stepped backing plate is very complicated, and the replacement cycle is long, the state of the stepped backing plate will have a great adverse effect on the stability, and other methods must be adopted to alleviate it. or eliminate

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