Cold rolled broken thin strip steel machine starting method

A thin gauge, strip steel technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as cost loss, stable impact on production, and finished products that do not meet thickness requirements, so as to recover economic losses and avoid The effect of breaking the belt again

Inactive Publication Date: 2019-09-27
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will produce finished products that do not meet the thickness requirements, and cannot honor the contract, resulting in a huge cost loss. According to statistics, there will be no less than 5 times of thin-gauge broken belts per month on average. After the belt is broken, the car will be broken again The belt rate reached more than 90%, which had a great impact on the stability of production

Method used

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  • Cold rolled broken thin strip steel machine starting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step: when the unit produces a 0.5mm thin strip with a thickness of 2.3mm as a raw material, after the strip is broken, the strip is manually threaded first, and the preparations before starting the car are prepared, and the secondary system of the rolling mill In the middle, the thickness of the finished product rolled by the strip is changed to the rolling intermediate thickness value of 0.6mm, and the secondary system is recalculated so that the rolling parameters are implemented in the way of rolling 0.6mm with a raw material thickness of 2.3mm;

[0022] The second step: After the rolling mill starts, observe the thickness change of the rolled strip, when the actual product thickness reaches 0.6±0.05mm, manually operate the rolling mill to stop;

[0023] In the third step, after the rolling mill is stopped, in the secondary system, change the current rolled product thickness 0.6±0.05mm to the rolling target required thickness of 0.5mm, recalculate the secondary ...

Embodiment 2

[0026] Such as figure 1 As shown, the first step: when the unit produces a raw material with a thickness of 2.1mm and a rolled product with a thickness of 0.4mm, after the strip is broken, the strip is first manually threaded, and the preparations before starting the car are prepared, and the secondary system In the middle, the thickness of the finished strip rolled by the strip steel is changed to the rolling intermediate thickness value of 0.6mm, and the secondary system is recalculated so that the rolling parameters are implemented in the manner of rolling 0.6mm with a raw material thickness of 2.1mm;

[0027] Step 2: After the rolling mill starts, observe the thickness changes of the rolled strips. When the actual product thickness reaches 0.6±0.05mm, manually stop the operation;

[0028] In the third step, after the rolling mill is stopped, in the secondary system, change the thickness of the currently rolled finished product from 0.6±0.05mm to the target rolling thickness of ...

Embodiment 3

[0031] Such as figure 1 As shown, the first step: when the unit produces raw materials with a thickness of 2.0mm and a rolled product with a thickness of 0.35mm, after the strip is broken, the strip is first manually threaded, and the preparations before starting the car are prepared, and the second system In the middle, the thickness of the finished product rolled by the strip is changed to the rolling intermediate thickness value of 0.6mm, and the secondary system is recalculated so that the rolling parameters are implemented in the manner of rolling 0.35mm with a raw material thickness of 2.0mm;

[0032] Step 2: After the rolling mill starts, observe the thickness changes of the rolled strips. When the actual product thickness reaches 0.6±0.05mm, manually stop the operation;

[0033] In the third step, after the rolling mill is stopped, in the secondary system, change the thickness of the finished product currently rolled from 0.6±0.05mm to the required thickness of the rolling ...

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Abstract

The invention relates to a cold rolled broken thin strip steel machine starting method and belongs to the technical field of the cold rolling process of the metallurgy industry. According to the technical scheme, the cold rolled broken thin strip steel machine starting method comprises the steps of (1) completing strip threading again after strip steel is broken, changing the thickness of a finished product to an intermediate thickness greater than the thickness of the finished product in a rolling machine secondary control system and starting a machine through computation of the rolling machine secondary control system; (2) stopping the machine again after the actual thickness of the product reaches the intermediate thickness +/-0.05 mm; and (3) changing the intermediate thickness in the rolling machine secondary control system to the thickness of the finished product again and starting the machine again through computation of the rolling machine secondary control system until normal production is recovered. The cold rolled broken thin strip steel machine starting method has the beneficial effects that accidents of strip breaking and rolling cracking again during thin-specification machine starting is avoided through step-by-step thickness pressing-down, and economic losses caused by thickness discrepancy through a traditional thin-specification machine starting method are restored.

Description

Technical field [0001] The invention relates to a method for starting a cold-rolled thin-gauge steel strip after the strip is broken, and belongs to the technical field of cold-rolling and rolling processes in the metallurgical industry. Background technique [0002] The proportion of thin-gauge home appliance plates is relatively high. When the thin-gauges are generally rolled from raw materials with thicknesses of 2.0mm-2.3mm to 0.35mm-0.5mm, due to raw material defects and trimming factors, the stripping rate during the rolling process is relatively high. , It is very difficult to start the car after the thin gauge is broken. The reason is that the reduction of each stand in the cold rolling process is too large, especially the F4 stand, the reduction tends to be the thinnest, which makes it difficult to control the shape of the plate, and it is very easy to cause vicious accidents such as strip breakage and rolling crack. After the thin gauge belt is broken, if the car is st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00
CPCB21B37/00
Inventor 周建军王印周耿波肖沛文朱保祥雷鹏陈晓丽
Owner HANDAN IRON & STEEL GROUP
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