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Control method of rolling deflection of hot-rolled strip steel

A control method and technology for hot-rolled strip steel, applied in the direction of rolling force/roll gap control, etc., can solve the problems of strip steel finishing rolling and rolling deviation, reduce rolling deviation scrap, improve hot-rolling rolling Stability and shape quality of strip products, the effect of improving stability

Active Publication Date: 2017-03-08
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the problem of deviation in the finishing rolling of strip steel due to the wedge shape of the rough rolling intermediate billet

Method used

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  • Control method of rolling deflection of hot-rolled strip steel
  • Control method of rolling deflection of hot-rolled strip steel
  • Control method of rolling deflection of hot-rolled strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Such as image 3 As shown, conventional hot rolling lines generally need to go through slab heating, high-pressure water descaling, rough rolling, head and tail cutting, finish rolling, laminar cooling, and coiling. Compared with conventional hot rolling lines, this application has A thickness gauge is added at , which is used to detect the transverse thickness distribution of the intermediate billet, so as to calculate the wedge shape of the intermediate billet. In this embodiment, the strip deviation control method is a method based on the wedge measurement of the intermediate billet and the wedge compensation of the roll gap of the rolling mill. According to the measurement data of the transverse thickness of the rough rolling intermediate billet, the wedge compensation amount of the finishing roll gap is calculated, and Reasonably set the reduction on both sides of each stand of the finish rolling mill to reduce rolling deviation of scrap steel and improve the stabi...

Embodiment 1

[0050] For the production process of a hot-rolled product, the width of the rough rolling intermediate billet is 1250.0mm, the thickness is 35.0mm, the thickness of the operation side and the transmission side are 35.02mm and 34.22mm respectively, and the exit thickness of each stand of the finish rolling mill is shown in Table 1.

[0051] Table 1 Finish rolling mill exit thickness of each stand

[0052]

[0053] Calculate the wedge shape of the intermediate billet as:

[0054] W e =h w -h d =35.02-34.22=0.80(mm)

[0055] and a proportional wedge:

[0056]

[0057] Table 2 shows the calculated roll gap wedge compensation for each stand of the finish rolling mill.

[0058] Table 2 Wedge compensation amount of roll gap for each stand of finishing rolling mill

[0059] frame F1 F2 F3 F4 F5 F6 F7 Compensation amount / mm 0.54 0.38 0.27 0.20 0.15 0.12 0.10

Embodiment 2

[0061] For the production process of a hot-rolled product, the width of the rough rolling intermediate billet is 1650.0mm, the thickness is 40.0mm, the thickness of the operation side and the transmission side are 41.35mm and 39.94mm respectively, and the exit thickness of each stand of the finish rolling mill is shown in Table 3.

[0062] Table 3 Finish rolling mill exit thickness of each stand

[0063]

[0064] According to the calculation formula of this application, the wedge shape of the intermediate blank can be calculated:

[0065] W e =h w -h d =41.35-39.94=1.41(mm)

[0066] and a proportional wedge:

[0067]

[0068] Thus, the wedge compensation amount of the roll gap of each rolling mill is calculated as shown in Table 4.

[0069] Table 4 Roll gap wedge compensation amount of each rolling mill

[0070] frame F1 F2 F3 F4 F5 F6 F7 Compensation amount / mm 0.93 0.64 0.46 0.35 0.28 0.24 0.21

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Abstract

The invention relates to a control method of rolling deflection of hot-rolled strip steel. The control method comprises the following steps that horizontal thickness distribution of an intermediate billet is measured in a real-time manner at a rough rolling outlet; and the wedge compensation of a finishing roller gap is calculated according to the horizontal thickness measured data of the roughly rolled intermediate billet, and the rolling reductions of two sides of finishing mills are reasonably set. Steel scraps generated due to rolling deflection are decreased, and the hot rolling stability and the strip shape quality of a strip steel product are improved. The problem that since the roughly rolled intermediate billet is wedged, the finish rolling deflection of the strip steel is caused is solved.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel strip production, in particular to a control technology for strip rolling deviation. 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. figure 1 Shown is a typical hot-rolled strip production schematic. The production process generally includes slab heating, high-pressure water descaling, rough rolling, head and tail cutting, finish rolling, laminar cooling, and coiling. [0003] The slab after rough rolling is also called intermediate billet. In the actual production of hot-rolled strip steel, the intermediate billet often has a certain wedge shape. When the amount of wedge is large, it will have an adverse effect on the subsequent finish rolling, which will easily lead to rolling deviation and scrap steel accidents, and at the same time, product quality problems such as st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/58
Inventor 张国民王巍
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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