Method for judging and controlling strip steel rollover during pressure measurement of rough rolling vertical roll of hot continuous rolling mill

Abstract

The invention discloses a method for judging and controlling strip steel rollover during pressure measurement of a rough rolling vertical roll of a hot continuous rolling mill. The method comprises the following steps: 1) establishing a first rolling force relation change judgment model, respectively acquiring rolling force data of an upper side pressing mechanism and a lower side pressing mechanism, and entering step 2) if the rolling force relation difference value is judged to be between 0.8 and 0.9; 2) establishing a control model for preventing the strip steel from rollover, opening a roll gap of the vertical roll, and correcting the rolling force; 3) establishing a second rolling force relation change judgment model, collecting rolling force relation difference data corrected in the step 2), and if it is judged that the rolling force relation difference value ranges from 0.8 to 0.9, repeating the step 2) to the step 3); if it is judged that the rolling force relation difference is larger than 0.9, carrying out normal rolling work; and 4) starting a width control model for recalculation, and conducting vertical roll load redistribution again. According to the rolling force relation change measured by an upper side pressing mechanism and a lower side pressing mechanism, whether the tail of the strip steel tends to roll over or not is judged, and the roll gap of the vertical roll is controlled.

Description

technical field [0001] The invention relates to a hot-rolling production process control technology, and more specifically, relates to a method for judging and controlling rollover of a strip steel during pressure measurement of a rough-rolling vertical roll of a 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 vertical roll 1 is the main equipment for the width control of the hot-rolled strip steel 2, and a pair of vertical rolls has four side pressure mechanisms 5 and two pull-back oil cylinders 6. The side pressure mechanism 5 has two forms at present, and one is the full hydraulic form, and the other is the c...

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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