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

A surface quality and control method technology, applied in the field of cold rolling in the metallurgical field, can solve problems such as plate shape variation, achieve the effects of improving roll shape, eliminating roll marks on the outer ring of steel coils, and optimizing plate shape

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 redu

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

[0105] Embodiment 1 (only put into frame 5 bending roll compensation function)

[0106] Production status: The production specification of the rolling mill is 2.53mm / 0.491mm×1358mm, and the rolling speed is 1028.3mpm. The edge of the steel plate is severely corrugated. Wrinkles and embossing will occur on both sides of the steel coil after being pressed by the pressure roller of the coiler. The strip steel coil is sealed. The unqualified surface quality of the strip steel will affect the yield of the product in the rolling mill. Affect the stable production of the rolling mill.

[0107] Adjustment status: For this reason, on the next roll of strip steel with the same specification (2.53mm / 0.491mm×1358mm), only the roll bending compensation function of frame 5 is put into operation, and debugging is carried out.

[0108] key parameter:

[0109] a: h5 thickness, determine whether this function is enabled;

[0110] b: The relationship between speed V5 and rolling force P5, predi...

Embodiment 2

[0121] Embodiment 2 (put into frame 4 and frame 5 roll bending compensation function)

[0122] Production status: The production specification of the rolling mill is 2.53mm / 0.491mm×1358mm, and the rolling speed is 1045.3mpm. The edge of the steel plate is severely corrugated. Wrinkles and embossing will occur on both sides of the steel coil after being pressed by the pressure roller of the coiler, and the strip steel coil will be sealed.

[0123] Adjustment status: put into the roll bending compensation function of frame 4 and roll bending compensation function of frame 5 respectively, and carry out debugging.

[0124] 1) Adjustment of roll bending compensation function on frame 4

[0125] key parameter:

[0126] a: h5 thickness, determine whether this function is enabled;

[0127] b: The time T in the 1st inertial delay link 1 / (1+Ts), to determine the filtering effect;

[0128] c: MAX(F WR ), the maximum adjustable amount of bending compensation;

[0129] d: KIG, to det...

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Abstract

The invention discloses a control method for a cold rolling mill for improving surface quality of strip steel, which comprises the following steps: independently controlling a last stander X or controlling the last stander X and a 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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