Subsection adjusting method for finish rolling plate shape

Abstract

The invention relates to a subsection adjusting method for a finish rolling plate shape. The method comprises the steps that 1, a front-section machine frame of a finish rolling unit is adjusted, andthe front-section machine frame is adjusted and divided into a rolling start stage, a box type hole building stage and an expansion stage according to the roller period length; and 2, a rear-section machine frame of the finish rolling unit is adjusted, the plate shape adjusting way of the rear-section machine frame of the finish rolling unit is inverted adjusting, and the rear-section machine frame is adjusted and divided into a biting state, a rolling state and a steel throwing state according to the whole rolling process of strip steel. The manual control ability of the finish rolling unit plate shape can be improved, the plate shape adjusting way is changed from a passive way into an existing active way, the finish rolling plate shape quality is improved, the accidents of drift and steel clamping caused by sudden changing of the plate shape are reduced, the production line yield and stable production ability are improved, and the production cost is reduced; and personalized customization requirements are met, and a series of problems that production line client development, product expansion and the like are affected are solved.

Description

technical field [0001] The invention relates to the technical field of steel rolling production, in particular to a segmental adjustment method for finish rolling plate shape. Background technique [0002] Plate shape is the abbreviation of the flatness of the plate and strip. It generally refers to the presence and degree of wave shape, scoop or side bend. Common hot-rolled strip shape defects include sickle bend, "S" bend, edge wave , middle wave, rib wave, etc. and scoop, etc., the plate shape in the usual sense also includes the convexity and wedge shape of the strip. The convexity of the strip is the difference between the thickness of the middle part of the cross-section of the strip and the average thickness of both sides, and the wedge shape of the strip is the difference between the thickness of one side and the other side on the cross-section of the strip. It shows the uniformity of the distribution of the transverse section of the first line. The actual rolled st...

AI Technical Summary

Problems solved by technology

[0005] In hot rolling production, the current flatness control method of the finishing mill is relatively fixed and single, which cannot fully adapt to the complex and changeable flatness in the finishing rolling area, resulting in poor shape stability in the finishing rolling area and large variables. The midstream racks (F3, F4, F5) that play the role of connecting transition have plate shape problems, such as strip steel waves, intensified deviation, sudden changes, etc. If the control is not proper, tail flicking, broken belts, or even steel jamming accidents will occur. Even if the strip rolled out smoothly, it will be judged as a defective product due to poor shape, which seriously affects the cost control and profitability of the production line