Production method and system for controlling male and female surfaces of double-high-speed bar

Abstract

The invention belongs to the technical field of steel production, and relates to a production method and system for controlling the male and female surfaces of a double-high-speed bar, and the system comprises a pre-finish rolling segmentation unit, a finish rolling unit, a high-speed flying shear, a tail clamping brake and a cooling bed which are sequentially arranged in the rolling production direction; the finish rolling unit comprises a first finish rolling unit, a flying shear before finish rolling, a second finish rolling unit and a cooling water tank which are connected in series in the rolling production direction; the cooling water tanks are arranged behind the pre-finish rolling cutting unit, the first finish rolling unit and the second finish rolling unit; and a pinch roll for clamping a rolled piece is arranged behind the cooling water tank. In the invention, the finish rolling unit adopts a multi-line parallel mode, and each branch is independently controlled and does not influence each other, so that female and male surface control and efficient production of the double-high-speed bar are realized through the cooling water tank, the pinch roll, the diameter measuring instrument and the temperature measuring instrument which are independently controlled. Differentiation control is carried out on control parameters of all branches according to the actual situation, and the differences of the structures and the mechanical properties of products of all the branches are reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and relates to a production method and system for controlling the male and female surfaces of double-speed rods. Background technique [0002] Bars are mainly divided into rebar bars for construction and premium special steel bars, which are widely used in construction, automobiles, engineering machinery, bridges and metal products industries. As the rebar bar with the largest proportion of single output, its output in 2020 will reach 266.39 million tons, accounting for 25.3% of my country's crude steel output. [0003] At present, there are mainly two production methods for small and medium-sized rebar bars: the split rolling production method and the high-speed bar rolling production method. [0004] 1. Slit rolling: that is, the rolling technology that cuts the rolled piece into two or more lines in the longitudinal direction by using the roll pass, the slitting wheel in the...

AI Technical Summary

Problems solved by technology

[0005] (1) The speed limit of slitting and rolling can only reach a maximum of 18m / s. At present, most production lines are only 14-16m / s;

[0006] (2) Affected by multi-line rolling, split rolling products cannot achieve accurate negative deviation rolling;

[0008] (4) After slitting and rolling, the product is prone to burrs and edge defects, which can easily lead to folding or crack defects, and the yield is low;

[0009] (5) It needs to be twisted after cutting, and it needs to be equipped with a torsion guide. The torsion rolling is easy to cause scratches and affect the surface quality of the product, and affect the width during the rolling process, which in turn affects the dimensional accuracy of the final product;

[0010] (6) The split rolling process is prone to failure, the labor intensity of the workers is high, and the utilization rate of the rolling mill is reduced

[0013] (1) Since the cutting position is in the middle of the rolled piece, there is a "yin and yang surface" in the rolled piece after cutting, and the temperature of the rolled piece is prone to fluctuations, resulting in fluctuations in water cooling parameters;

[0014] (2) The rolled piece is easy to twist after cutting, and the "rotation" phenomenon occurs during the conveying process of the rolled piece, which may easily cause the rolling line failure;

[0015] (3) The temperature measuring instrument configured in the two branches is located on one side of the rolled piece, and the temperature deviation of the rolled piece is large due to different measurement positions;

[0016] (4) Due to the difference in temperature and size of the two branches, the difference in temperature rise and temperature control leads to differences in the structure and mechanical properties of the products in the two branches

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