Fixed-width press plate blank width control method

Abstract

The invention discloses a fixed-width press plate blank width control method, and belongs to the technical field of steel rolling automatic control. During the process of laterally rolling the head and the tail of a plate blank by a fixed-width press, the head part and the tail part of the plate blank are in plane stress states; according to the metal flow principle of the head part and the tail part of the plate blank, and tongue and fishtail phenomena can be generated. In order to improve the condition, the widths of the head and the tail of the plate blank are controlled in short stroke by adopting the fixed-width press; under the working condition that stripe steel rolling temperature and rolling cycle are ensured, the severe width failure of the head and the tail of the stripe steel can be improved, and the final rolling target width index is ensured effectively; a pass band guarantees the width index deviation range to be 0-8mm, the yield is improved, and the production cost is saved; and when the plate blank is pressed greatly, similar to the small lateral pressing amount, the outlet width is obtained through pressing one time, the rolling temperature of the stripe steel is ensured, and the rolling cycle is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling automation control, in particular to a method for controlling the width of a slab of a fixed-width press. Background technique [0002] There are two main types of width adjustment equipment on the hot rolling production line. One is the slab fixed width press, which performs large lateral pressure on the entire length of the slab in the forging state to achieve the purpose of large width reduction. The maximum width reduction The second is the vertical roll mill, which is usually used in conjunction with the flat roll mill. After several passes of rolling, the width reduction is generally not more than 100mm. The hot rolling production line is equipped with a fixed-width press. The main function of the vertical roll mill is to adjust the width slightly to control the natural width after rolling in the subsequent rough rolling flat roll mill. The fixed-width press is aimed at the target widt...

AI Technical Summary

Problems solved by technology

Through retrieval, it is found that in Patent No. CN101633002A, a method for controlling the large lateral pressure of the slab is described, and the method of using the slab at the head and tail to improve the head and tail loss of width of the strip is adopted at the head and tail. The actuator of the widening equipment is one-time width reduction and reduction for one stroke, which has a certain impact on the rolling rhythm and the temperature drop of the slab. In the prior art, the equipment width reduction capacity of SSP can reach 350mm at a time, so it is required to have relevant The automatic control technology makes it possible to ensure the rolling temperature, improve the rolling rhythm, and ensure the width index of the head and tail during the automatic production process of steel rolling.

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