Method for correcting error of middle blank for pass-reversible rolling

Abstract

The invention relates to the control technology in the rolled steel rolling process, particularly to a control method for a camber of a middle blank of a roughing mill. An error-correcting method for the middle blank when a reversible pass is rolled comprises the following steps: through side guiding plates controlled by a servo valve and installed on the front side and the back side of a frame of a horizontal rolling mill, the change of the pressure of the middle blank detected by the side guiding plates on the side guiding plates; an odd pass or an even pass is firstly judged, and the tail part of the middle blank biasing a driving side of the horizontal rolling mill or a working side of a rolling mill is judged, wherein the two ends of a roll gap of the horizontal rolling mill are composed of the driving side of the rolling mill and the working side of the rolling mill; and then a hydraulic adjustment device is started up to adjust the roll gap of the horizontal rolling mill and realize the error correction. In the invention, the side guiding plates and a roll gap adjustment device are necessary equipment in the modern steel rolling mill without the need of additional investment, and not influenced by environmental factors such as descaling water, water vapor and the like. Therefore, the method for controlling the camber of the middle blank of the roughing mill is easily promoted and applied.

Description

technical field [0001] The invention relates to the control technology in the rolling process of steel rolling, in particular to the control method of the camber of the rough rolling intermediate slab. Background technique [0002] The rough rolling in the hot rolling process generally consists of two stands R1 and R2, among which the R2 stand (that is, the horizontal rolling mill, hereinafter referred to as the horizontal rolling mill) is the core stand. Usually, R2 adopts 1-5 passes of rolling, and seldom adopts 1-3 passes of rolling. Since the 1st to 5th passes or 1st to 3rd passes are reversible rolling, the shape of the plate changes greatly during the rolling process, and it often occurs that the middle billet deviates, and the head and tail of the middle billet are S-shaped and other plate shapes. unpleasant sight. Generally, the phenomenon of horizontal bending of the intermediate billet after each pass is called camber. The harm of camber in the intermediate bille...

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Problems solved by technology

[0006] There are several difficulties in the above-mentioned control method. First, the camber caused by temperature and roll gap difference is coupled together, and it is difficult to clearly determine which reason is at work; The detector requires a large investment, occupies a large area, has high installation accuracy, and is difficult to maintain. It is also susceptible to false detection due to environmental factors such as descaling water and water vapor before and after the rolling mill. Modern steel plants will not use this technology, especially reversible Rolled roughing mills are less likely to be installed

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