A method for controlling the head width of hot-rolled finish-rolled steel strip to prevent stretching and narrowing

A technology of head width and control method, which is applied in the direction of rolling mill control device, tail end control, metal rolling, etc., can solve the problems of strip width narrowing, difficult to calculate accurately, and difficult to accurately predict the temperature of strip head, etc. To achieve the effect of avoiding strip narrowing

Active Publication Date: 2021-03-12
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme is mainly based on the calculated value of the tension after biting the steel. In an unstable state, it is difficult to calculate accurately
Patent Publication No. CN103464472 According to the temperature of the strip steel, the tension value of the strip steel is dynamically set, thereby solving the problem that the width of the strip steel narrows as the temperature rises; this solution mainly solves the influence of temperature changes on the width of the strip steel, but the The temperature of the head is difficult to predict accurately, which will affect the control effect

Method used

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  • A method for controlling the head width of hot-rolled finish-rolled steel strip to prevent stretching and narrowing
  • A method for controlling the head width of hot-rolled finish-rolled steel strip to prevent stretching and narrowing
  • A method for controlling the head width of hot-rolled finish-rolled steel strip to prevent stretching and narrowing

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Experimental program
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Effect test

Embodiment 1

[0055] A method for controlling the width of the strip head in hot continuous rolling to prevent narrowing. For the 5# looper of a certain steel rolling, the control method for preventing the strip head from being narrowed is as follows:

[0056] S1. After the downstream frame bites the steel, the looper is lifted up quickly with a certain torque until it touches the strip steel. The condition for judging that the looper touches the strip steel is ω act max , and the value range of γ is 0.7. It can be obtained that the looper contacts the strip steel 500ms after F6 bites the steel.

[0057] S2. Record the set amount deviation L when the looper contacts the strip steel dev is 0.0016m, the upstream rack speed V touch is 7.71m / s, the maximum process speed V in the belt threading process of the upstream frame max is 9m / s, then according to the values ​​in Table 1, calculate the upstream frame speed compensation value V add for:

[0058]

[0059] S3, take T s is 20s, ω Ju...

Embodiment 2

[0063] A method for controlling the head width of the hot-rolled finish-rolled steel strip to prevent narrowing. For the 3# looper of a certain steel rolling, the control method for preventing the strip head from being narrowed is as follows:

[0064] S1. After the downstream frame bites the steel, the looper is lifted up quickly with a certain torque until it touches the strip steel. The condition for judging that the looper touches the strip steel is ω act max , and the value range of γ is 0.7. It can be obtained that the looper touches the strip steel 600ms after F4 bites the steel.

[0065] S2. Record the set amount deviation L when the looper contacts the strip steel dev is 0.0028m, the upstream frame speed V touch is 3.08m / s, the maximum process speed V during the threading process of the upstream frame max is 5m / s, then according to the values ​​in Table 2, calculate the upstream frame speed compensation value V add for:

[0066]

[0067] Table 2 V PLI Segmente...

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Abstract

The invention discloses a method for controlling the head width of hot-rolled finish-rolled steel strip to prevent narrowing, which belongs to the technical field of hot-rolled steel strip production, and includes the following steps: S1, judging whether the looper contacts the strip steel; S2, according to the The amount deviation compensates the speed of the upstream rolling mill; S3, judging whether the looper is in the state of drawing steel; S4, in the state of drawing steel, modifying the control parameters, so that the strip steel can quickly and stably leave the state of drawing steel. Firstly, according to the actual amount of looper when the looper lifts the sleeve to contact the strip steel, the speed of the main drive is quickly compensated, and then after the loop amount control is put in, the possible state of the steel drawing is judged, and the corresponding control parameters are modified to make the looper It can quickly get out of the steel drawing state. The present invention intervenes in real time with the additional amount of speed and the adjustment rate of the main transmission speed, thereby avoiding to the greatest extent the narrowing phenomenon of the strip steel caused by the actual amount of sheathing between racks during belt threading is too large or too small.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel strip production, in particular to a method for controlling the head width of a hot-rolled finish-rolled steel strip to prevent stretching and narrowing. Background technique [0002] In the process of hot continuous rolling and finishing rolling control, strip threading is a very important and difficult to control link. During the period from the start of steel biting to the stable input of looper control, violent tension fluctuations are likely to occur, causing strip steel The head is narrowed, which will seriously cause the accident of stacking and rolling scrap steel. The premise that the looper can be quickly and stably controlled during belt threading is that the metal second flow difference between the racks is maintained within a certain range, but it is affected by the initial roll gap and speed setting of the process machine, and the impact speed drop of the main drive during t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/22B21B37/72
CPCB21B37/22B21B37/72
Inventor 李家波张健民张智勇
Owner BAOSHAN IRON & STEEL CO LTD
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