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A Method for Controlling Transverse Thickness Accuracy of Wide and Heavy Plate Flat Roll Mill

A technology of thickness accuracy and control method, which is applied in the field of steel rolling, can solve problems such as inapplicability, and achieve the effects of easy realization, simple operation, and easy popularization and application

Active Publication Date: 2020-02-07
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is realized through the special requirements for the roll shape, and it is suitable for continuous rolling mills, but not suitable for wide and thick plate mills with flat rolls.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After replacing the work rolls, roll the first finished steel plate with a thickness of 10mm, and control the rolling force of the last two passes to 18MN. The convexity of the first steel plate after rolling is -0.03mm; when rolling the second finished steel plate with a thickness of 10mm, the rolling force of the last two passes is increased by 6MN on the basis of the first piece, that is, the second finished product is rolled The rolling force of the last two passes of a steel plate with a thickness of 10mm is 24MN, and the crown of the second steel plate after rolling is 0.035mm, which meets the requirement that the crown of the steel plate is between 0.02 and 0.08mm. The rolling force of the last two passes is 24MN when rolling the second and later steel plates with the same thickness and specification, and the convexity of the rolled steel plates can meet the requirements.

Embodiment 2

[0027] After replacing the work rolls, roll the first finished steel plate with a thickness of 20mm, and control the rolling force of the last two passes to 22MN. The rolled crown of the first steel plate is -0.04mm; when rolling the second finished steel plate with a thickness of 20mm, the rolling force of the last two passes is increased by 6MN on the basis of the first piece, that is, the second finished product is rolled The rolling force of the last two passes of a steel plate with a thickness of 20mm is 24MN, and the convexity of the rolled steel plate of the second steel plate is 0.018mm; when rolling the third steel plate with a thickness of 20mm, the rolling force of the last two passes is 2MN is added on the basis of the second steel plate, that is, the rolling force of the last two passes of the third steel plate with a finished product thickness of 20mm is 26MN. Requirements between mm. The rolling force of the last two passes is 26MN when rolling the steel plate ...

Embodiment 3

[0029] After replacing the work rolls, roll the first finished steel plate with a thickness of 10mm, and control the rolling force of the last two passes to 22MN. The convexity of the first steel plate after rolling is 0.11mm; when rolling the second steel plate with a thickness of 20mm, the rolling force of the last two passes is reduced by 6MN on the basis of the first plate, that is, the thickness of the second finished product is rolled The rolling force of the last two passes of the 20mm steel plate is 18MN, and the crown of the second steel plate after rolling is 0.046mm, which meets the requirement that the crown of the steel plate is between 0.02 and 0.08mm. The rolling force of the last two passes is 18MN when rolling the second and later steel plates with the same thickness and specifications, and the convexity of the rolled steel plates can meet the requirements.

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Abstract

The invention discloses a method for controlling the transverse thickness precision of a wide and thick plate flat roll rolling machine. The method is particularly suitable for producing a steel platewith the thickness of 14-40 mm through the wide and thick plate flat roll rolling machine. Through changing a working roll and limiting the rolling force of the final two passes of the steel plate with different thickness specifications, and when the convexity degree does not meet the requirement, a proper adjusting strategy is formulated, so that the convexity degree of the steel plate rolled bythe wide and thick plate flat roll rolling machine can be effectively controlled, and the transverse thickness control precision of the wide and thick plate flat roll rolling machine can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling the transverse thickness accuracy of a wide and thick plate flat roll rolling mill. Background technique [0002] In the production of wide and thick plates, the thickness difference of the same plate is very important. The longitudinal thickness difference along the length direction of the steel plate is mainly realized by reducing the longitudinal roll gap fluctuation during rolling; the transverse thickness difference is mainly realized by the roll profile preset A crown value and achieved using bending rolls or using bending rolls alone. The size of the transverse thickness difference not only affects the thickness accuracy of the steel plate, but also has a significant impact on the flatness of the steel plate. When the thickness of the middle part of the steel plate is much larger than that of both sides, that is, when the positive convexity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16
CPCB21B37/16B21B2261/04
Inventor 温利军薛越李浩赵超张满全徐建东高军
Owner BAOTOU IRON & STEEL GRP