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Compensation method for deviation of rolling center line of hot-rolled medium-thickness plate

A technology of rolling center line and compensation method, which is applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as unsuitable high-precision compensation methods, and achieve simple and practical calculation methods and good center line offset , the effect of improving the calculation accuracy

Pending Publication Date: 2022-03-11
TANGSHAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the technical solutions of the above patents are not suitable for the high-precision compensation method for the center line offset of medium and heavy plate rolling applied on-line

Method used

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  • Compensation method for deviation of rolling center line of hot-rolled medium-thickness plate
  • Compensation method for deviation of rolling center line of hot-rolled medium-thickness plate
  • Compensation method for deviation of rolling center line of hot-rolled medium-thickness plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare a cast slab with a thickness of 250mm and a width of 1600mm, and roll it into a Q235 carbon structural steel plate with a thickness of 30mm through a hot rolling mill. The calculation process of the roll gap leveling amount used to compensate for the offset of the center line of the steel plate is as follows:

[0039] (1) Use the width gauge to measure the offset of the center line of the slab after the first pass of rolling, respectively ΔB H =-20mm, ΔB B = 0mm, ΔB T =-40mm;

[0040] (2) According to the measured ΔB H , ΔB B and ΔB T , to calculate the slab comprehensive centerline offset ΔB C for:

[0041] ΔB C =((-20)+(-40)) / 2-0=-30mm

[0042] (3) Read the rolling force setting value P of the second pass in the control system = 19500kN, then the rolling force deviation ΔP on both sides caused by the offset of the center line is:

[0043]

[0044] (4) According to the rolling force deviation ΔP and the total rolling force P, calculate the driving s...

Embodiment 2

[0052] Prepare a cast slab with a thickness of 250mm and a width of 2100mm, and roll it into a steel plate with a thickness of 40mm through a hot rolling mill.

[0053](1) Use a width gauge to measure the centerline offset ΔB of the slab after the first rolling pass H , ΔB B and ΔB T 30mm, -10mm and 50mm respectively;

[0054] (2) According to the measured ΔB H , ΔB B and ΔB T , to calculate the slab comprehensive centerline offset ΔB C for:

[0055] ΔB C =(30+50) / 2-(-10)=50mm

[0056] (3) Read the rolling force setting value of the second pass in the control system P = 21300kN, then the rolling force deviation ΔP on both sides caused by the offset of the center line is:

[0057]

[0058] (4) According to the rolling force deviation ΔP and the total rolling force P, calculate the driving side rolling force P DS and operation side rolling force P OS ,for:

[0059]

[0060] (5) The rigidity of the operating side and the driving side are 5500kN / mm and 5600kN / mm ...

Embodiment 3

[0066] Prepare a cast slab with a thickness of 230mm and a width of 1500mm, and roll it into a 700L automobile frame steel intermediate billet with a thickness of 45mm by a roughing rolling mill. The calculation process of the roll gap leveling amount used to compensate for the offset of the center line of the steel plate is as follows:

[0067] (1) Use a width gauge to measure the centerline offset ΔB of the slab after the first rolling pass H , ΔB B and ΔB T -15mm, 5mm and -20mm respectively;

[0068] (2) According to the measured ΔB H , ΔB B and ΔB T , to calculate the slab comprehensive centerline offset ΔB C for:

[0069] ΔB C =((-15)+(-20)) / 2-5=-22.5mm

[0070] (3) Read the rolling force setting value P of the second pass in the control system = 15750kN, then the rolling force deviation ΔP on both sides caused by the offset of the center line is:

[0071]

[0072] (4) According to the rolling force deviation ΔP and the total rolling force P, calculate the dri...

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Abstract

The invention provides a compensation method for offset of a rolling center line of a hot-rolled medium-thickness plate, and belongs to the technical field of hot-rolled plate strip steel production. According to the method, the deformation characteristic of the rolled piece and the equipment characteristic of the rolling mill are obtained to a certain extent through the offset of the center line of the plate blank actually measured after first-pass rolling, the actual rigidity of the two sides of the rolling mill is fully considered in the calculation method, and the calculation precision of the bounce value is improved; the calculation method is simple and practical and can be easily nested into a control system, and the purposes of relieving the camber defect of the steel plate and improving the rolling stability are achieved.

Description

technical field [0001] The invention relates to the technical field of production of hot-rolled plates and strips, in particular to a method for compensating for the deviation of the rolling center line of hot-rolled medium and thick plates. Background technique [0002] Hot-rolled medium and thick plates are widely used in industrial fields such as construction engineering, container manufacturing, bridge construction and shipbuilding, and can also be used as the base material (intermediate billet) of hot-rolled thin plates. [0003] In the production of hot-rolled medium-thick plate (intermediate slab), the quality of the steel plate and the equipment load are very large, coupled with the uneven temperature of the slab, the centerline deviation of the steel plate is prone to occur during the rolling process. The deviation of the center line of the steel plate will cause the bounce value on both sides of the rolling mill to be inconsistent with the roll gap value, which wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28B21B37/68G07C3/00G07C3/14G06F17/10
CPCB21B37/28B21B37/68G07C3/005G07C3/146G06F17/10
Inventor 李萍李敬金鑫杨跃辉
Owner TANGSHAN COLLEGE
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