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Method for automatically controlling strip steel edge drop of cold tandem mill

A technology of cold tandem rolling mill and edge drop, applied in the field of control, to achieve the effect of ensuring control effect and stability

Active Publication Date: 2014-04-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The symmetrical work roll shifting method will not cause strip deviation and strip breakage, but this shifting method is helpless for asymmetrical edge drop deviation

Method used

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  • Method for automatically controlling strip steel edge drop of cold tandem mill
  • Method for automatically controlling strip steel edge drop of cold tandem mill
  • Method for automatically controlling strip steel edge drop of cold tandem mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Before the edge drop control is put into operation, first test the edge drop regulation ability of the first frame 5a, the second frame 5b, and the third frame 5c for symmetrical work roll movement, and obtain the gain coefficient: k S1 =0.03,k S2 =0.02,k S3 =0.02;

[0110] Drop the target edge and the gain factor k S1 , k S2 , k S3 Stored in the database on the edge drop controller 3. Carry out the following calculations according to the control period (T=0.75s) with the edge drop automatic control program.

[0111] The actual edge drop signal is received from the computer 2, and the actual edge drop signal is subjected to sliding average processing to obtain the actual edge drop average value. Subtract the target edge drop value from the actual edge drop average value to obtain the strip edge drop deviation value. At this time, the obtained edge drop deviation value on the operating side and the edge drop deviation value on the transmission side are respectively...

Embodiment 2

[0121] Before the edge drop control is put into operation, first test the edge drop regulation ability of the first frame 5a, the second frame 5b, and the third frame 5c for symmetrical work roll movement, and obtain the gain coefficient: k S1 =0.03,k S2 =0.02,k S3 =0.02;

[0122] Drop the target edge and the gain factor k S1 , k S2 , k S3 Stored in the database on the edge drop controller 3. Carry out the following calculations according to the control period (T=0.75s) with the edge drop automatic control program.

[0123] The actual edge drop signal is received from the computer 2, and the actual edge drop signal is subjected to sliding average processing to obtain the actual edge drop average value. Subtract the target edge drop value from the actual edge drop average value to obtain the strip edge drop deviation value. At this time, the obtained edge drop deviation value on the operating side and the edge drop deviation value on the transmission side are respectively...

Embodiment 3

[0133] Before the edge drop control is put into operation, first test the edge drop regulation ability of the first frame 5a, the second frame 5b, and the third frame 5c for symmetrical work roll movement, and obtain the gain coefficient: k S1 =0.05,k S2 =0.06,k S3 =0.06;

[0134] Drop the target edge and the gain factor k S1 , k S2 , k S3 Stored in the database on the edge drop controller 3.

[0135] The edge drop automatic control program is calculated as follows according to the control period (T=3s).

[0136] The actual edge drop signal is received from the computer 2, and the actual edge drop signal is subjected to sliding average processing to obtain the actual edge drop average value. Subtract the target edge drop value from the actual edge drop average value to obtain the strip edge drop deviation value. At this time, the obtained edge drop deviation value on the operating side and the edge drop deviation value on the transmission side are respectively: a 1 =-8,...

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Abstract

The invention relates to a method for automatically controlling a strip steel edge drop of a cold tandem mill, comprising the following steps of: obtaining a deviation value of the strip steel edge drop; obtaining edge drop deviations on an operating side and a transmission side, respectively; calculating the adjustment amount of symmetric drifting of a first frame work roll; calculating the adjustment amount of symmetric drifting of a second frame work roll; calculating the adjustment amount of symmetric drifting of a third frame work roll; correcting a set value in a PLC (Programmable Logic Controller) frame control device according to the adjustment amount delta TS1 of symmetric drifting of the first frame work roll, the adjustment amount delta TS2of symmetric drifting of the second frame work roll and the adjustment amount delta TS3 of symmetric drifting of the third frame work roll, thereby finally completing control on the actual edge drop of the strip steel. In the control method, the operating mode of symmetric drifting is adopted for the first frame to the third frame, so that the stability of the rolling process is ensured and the control effect of the edge drop is also ensured simultaneously.

Description

technical field [0001] The invention relates to a control method, in particular to an automatic control method for strip edge drop in a cold tandem rolling mill. Background technique [0002] With the continuous development of industrial production, the requirements for the geometric shape of cold-rolled strip are getting higher and higher. Therefore, the edge drop has become an important quality index of cold-rolled strip. The edge drop of cold-rolled strip directly affects the productivity, yield and cost of downstream industries, as well as the appearance of the product. Therefore, edge drop control technology is used in cold-rolled production to improve the index of strip edge drop. [0003] The tandem cold rolling mill is one of the most complex, highly automated, and precision-required equipment in the metallurgical industry. It represents the technological development level of the iron and steel industry to a certain extent. At present, the cold tandem mill has been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/20
Inventor 徐江华王康健郑涛程国营
Owner BAOSHAN IRON & STEEL CO LTD
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