Control method for preventing strip steel from rollover during pressure measurement of rough rolling vertical roll of hot continuous rolling mill

Abstract

The invention discloses a control method for preventing strip steel from rollover during pressure measurement of a rough rolling vertical roll of a hot continuous rolling mill, which comprises the following steps: 1) establishing a first rolling force judgment model, collecting rolling force data of the vertical roll after the vertical roll is engaged with the strip steel, and entering step 2) if the rolling force is judged to have deviation; 2) establishing a control model for preventing the strip steel from rollover to open the roll gap of the vertical roll so as to correct the rolling force of the vertical roll; 3) establishing a second rolling force judgment model, collecting the vertical roll rolling force data corrected in the step 2), and repeating the steps 1) to 3) if the rolling force is judged to have deviation; if it is judged that the rolling force is normal, carrying out normal rolling work; and 4) starting a width control model for recalculation, and conducting load redistribution of the vertical roll again. According to the change of the rolling force, whether the tail of the strip steel has the tendency of rollover in the vertical roll side pressing process or not is judged, the roll gap of the vertical roll is controlled immediately, and therefore the situation that the width of the tail of the roughly-rolled strip steel is seriously too large due to rollover of the strip steel is prevented.

Description

technical field [0001] The invention relates to the control technology of hot rolling production process, more specifically, relates to a control method for preventing rollover of strip steel during pressure measurement of rough rolling vertical roll of hot continuous rolling mill. Background technique [0002] Such as figure 1 As shown, the roughing mill generally consists of a large side press 3, vertical roll 11 (E1), horizontal roll 41 (R1), vertical roll 12 (E2), and horizontal roll 42 (R2). The width control of the hot-rolled steel strip 2 is mainly completed by the large side press 3 and the vertical rolls 11,12. [0003] Such as figure 2 As shown, the pressure measurement at the vertical roll for hot-rolled strip width control generally has three stages: the head short travel stage 21, the middle conventional side pressure stage 22, and the tail short travel stage 23. Certain breeds only have the regular lateral pressure stage. The short stroke at the head and t...

AI Technical Summary

Problems solved by technology

Among them, the two working faces of the flat rolls are parallel. Such a shape of the roll surface is not suitable for rolling the strip steel with a large amount of side pressure. During the rolling process, the strip steel tends to roll over, resulting in serious over-width of the strip tail.

There are protrusions on the working surface and the bottom of the pass roll. This type of roll solves the problem of rolling stability, but it is only effective when the thickness of the slab matches the height of the pass. It is not suitable for the production of billets with different thickness specifications. , at this time, the grooved rolls are prone to scratches on the strip surface

The upper part of the tapered roller body is conical, and the lower part is a boss. During rolling, due to the existence of the taper, the steel billet will be forced downward so that the billet will be pressed on the boss, which can realize stable rolling, but it is easy to cause the billet to fall. surface scratches

In addition, in the process of using small taper vertical rolls for pressure measurement, sometimes a trapezoidal section is formed, and the upper side of the trapezoidal section is rolled by a horizontal rolling mill, forming a black strip-shaped defect remaining on the upper surface of the strip

In the actual production process, none of these three vertical roll shapes can solve the problem of strip rollover during rough rolling vertical roll side pressure

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