A Roll Gap Leveling Correction Method for Finishing Mills Applicable to Free Schedule Rolling

Abstract

The invention provides a method for leveling and correcting the roll gap of a finishing mill suitable for free schedule rolling, and belongs to the technical field of plate and strip rolling. The method includes: acquiring PLC data, wherein the PLC data includes: secondary pre-control data of the steel strip to be rolled and rough rolling incoming material information, and the rough rolling incoming material information includes: rough rolling incoming material intermediate billet The bending length, incoming material bending, elongation difference and the wedge shape of the head of the intermediate billet; when the head of the intermediate billet of the rough rolling incoming material reaches the finishing vertical roll, according to the obtained PLC data and the equipment characteristics of the finishing rolling unit, calculate the Frame roll gap leveling correction value. By adopting the invention, the pre-leveling correction value of the roll gap of the next piece of steel can be accurately determined.

Description

technical field [0001] The invention relates to the technical field of plate and strip rolling, in particular to a method for leveling and correcting the roll gap of a finish rolling unit suitable for free schedule rolling. Background technique [0002] Hot-rolled strip steel is an important steel product, and hot rolling is one of the main methods of hot-rolled strip steel production. A hot continuous rolling production line mainly includes a heating furnace, a roughing mill, a finishing mill, a laminar cooling device, and a coiler. The finishing mill includes several finishing stands, and a conventional hot rolling production line is usually equipped with seven stands F1-F7. The production process of the hot continuous rolling production line is: first, the billet is heated by the slab in the heating furnace, secondly, it is dephosphorized by high-pressure water, and then it is rough-rolled by the rough rolling mill, then the head is cut and the tail is cut, and then it is...

AI Technical Summary

Problems solved by technology

However, with the improvement of quality and efficiency of the hot rolling production line, the use of free schedule rolling is becoming more and more frequent, which means that the strip grade, specification, thickness of both sides of the rough rolling incoming intermediate billet, elongation difference, entry angle into the rolling mill, etc. Factors may change drastically. If the leveling is not corrected quickly and accurately during the rolling interval, it will seriously affect the strip threading stability of the next piece of steel, and even cause accidents.

[0004] There are some rolling mill roll gap preset methods in the current technical publications, most of which focus on the roll gap preset according to the rolling mill stiffness, or convert all the change information of the strip into the wedge shape of the incoming material for finish rolling leveling setting, The deflection caused by the shape of the incoming material is not considered, and the influence of uneven extension on both sides of the incoming material on the leveling of the finish rolling

Therefore, it is impossible to accurately correct the roll gap leveling of the finishing stand, and then adapt to the finishing roll gap leveling of free schedule rolling.

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