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Control method for cold rolling mill for improving surface quality of strip steel

A technology of surface quality and control method, applied in the field of cold rolling in the metallurgical field, can solve problems such as poor plate deformation, and achieve the effects of improving the roll shape, eliminating the roll marks on the outer ring of the steel coil, and simplifying the control model.

Active Publication Date: 2009-09-30
宝钢日铁汽车板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The speed reduction in the shearing process is required by the process, and the change of the rolling force caused by the speed reduction is also a requirement of AGC (Automatic Gauge Control). Perform pre-compensation to solve the problem of plate shape variation

Method used

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  • Control method for cold rolling mill for improving surface quality of strip steel
  • Control method for cold rolling mill for improving surface quality of strip steel
  • Control method for cold rolling mill for improving surface quality of strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Embodiment 1 (only put into 4 rack bending roll compensation function)

[0107]Production status: The production specification of the rolling mill is 2.5mm / 0.35mm×1411mm, and the rolling speed is 570mpm. Before the weld seam enters the rolling mill, it is prepared for shearing. The side waves are serious, and wrinkling and embossing will occur on both sides of the steel coil after being pressed by the pressure roller of the coiler.

[0108] Adjustment status: For this reason, on the next roll of strip steel with the same specification (2.5mm / 0.35mm×1411mm), put into the 4-stand bending roll compensation function and carry out debugging.

[0109] key parameter:

[0110] a: h5 thickness, determine whether this function is enabled;

[0111] b: The time T in the 1st inertial delay link 1 / (1+Ts), to determine the filtering effect;

[0112] c: MAX(F WR ), the maximum adjustable amount of bending compensation;

[0113] d: KIG, to determine the integration time.

[0114] ...

Embodiment 2

[0122] Embodiment 2 (putting into 4 racks and 5 racks bending roll compensation function)

[0123] Production status: The production specification of the rolling mill is 2.5mm / 0.35mm×1411mm, and the rolling speed is 641.3mpm. The edge of the shape is serious, and wrinkling and embossing will occur on both sides of the steel coil after being pressed by the pressure roller of the coiler. The rolling mill produced stably.

[0124] Adjustment status: put into the 4-stand bending roll compensation function and 5-stand roll bending compensation function respectively, and carry out debugging.

[0125] 1), 4 frame bending roll compensation function adjustment

[0126] key parameter:

[0127] a: h5 thickness, determine whether this function is enabled;

[0128] b: The time T in the 1st inertial delay link 1 / (1+Ts), to determine the filtering effect;

[0129] c: MAX(F WR ), the maximum adjustable amount of bending compensation;

[0130] d: KIG, to determine the integration time. ...

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PUM

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Abstract

The invention discloses a control method for a cold rolling mill for improving the surface quality of strip steel, which comprises the following steps: independently controlling a previous stander X-1 of a last stander X or controlling the last stander X and the previous stander X-1 at the same time; and before a shape of the strip steel changes, predicting changes of the roll force to carry out precompensation on a bending roll so as to reduce the generation of a serious dual-side long edge, optimize the shape of export strip steel of a rolling mill, improve a shape of a working roll, and eliminate compression roller marks of an outer ring of a steel coil on a coiling machine. In addition, the method does not produce influence on stable rolling of the rolling mill.

Description

technical field [0001] The invention relates to cold rolling technology in the field of metallurgy, in particular to a method for controlling the surface quality of strip steel in a cold rolling mill. Background technique [0002] The surface quality of strip steel is an important index to measure the quality of products after cold rolling mills. Especially for the outer panels of automobiles, the surface quality requirements are high, and defects such as embossing are not allowed. If there are defects on the surface of the strip steel, the product will be judged. Waste or downgrade treatment will affect the unit product yield and the company's economic benefits. Therefore, in order to improve the competitiveness of products, various iron and steel plants have taken various measures to eliminate the quality defects of the unit. [0003] Such as figure 1 The UCM rolling mill shown, where BUR is the backup roll; IMR is the intermediate roll; WR is the work roll; PUC is the p...

Claims

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Application Information

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IPC IPC(8): B21B37/28G05B19/18
Inventor 肖至勇张伟
Owner 宝钢日铁汽车板有限公司
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