Automatic convexity control method for hot-rolled strip steel

A technology of hot-rolled strip steel and control method, applied in the direction of profile control, etc., can solve the problems of affecting rolling stability, unable to guarantee the crown control accuracy of the full length of the strip steel, etc., so as to improve the product shape quality and improve the crown. The effect of degree control

Active Publication Date: 2014-10-15
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0009] In order to overcome the problem that in the production of hot-rolled strip steel, the crown control accuracy of the entire length of the strip cannot be guaranteed under the condition that there is a deviation in the crown setting, that is, in order to realize the automatic control of the crown of the hot-rolled strip steel, ensure that the strip The uniformity of the steel crown over the entire length, while avoiding affecting the rolling stability, the present invention aims to propose an automatic control method for hot-rolled strip crown, that is, an automatic feedback control method for flatness

Method used

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  • Automatic convexity control method for hot-rolled strip steel
  • Automatic convexity control method for hot-rolled strip steel
  • Automatic convexity control method for hot-rolled strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] For a carbon steel product with a specification of 2*1150mm and a target convexity of 30μm (tolerance range ±20μm), the automatic convexity control method in this paper is used for production, and the control effect is as follows Figure 5 shown.

[0060] The set value and the actual value of the bending force of each rack are shown in Table 1 below. The average measured value of the final strip crown is 33 μm, which reaches the target range required by the product.

[0061] Table 1 Bending force of each frame (unit: kN)

[0062] using method

Embodiment 2

[0064] For a carbon steel product with a specification of 12*1380mm and a target convexity of 40μm (tolerance range ±20μm), the automatic control method of convexity in this paper is used for production. The measured strip crown after threading is 46 μm. The set value of the bending force of each frame and the actual value after dynamic adjustment are shown in Table 2 below. The average measured value of the final strip crown is 39 μm, reaching the target range required by the product.

[0065] Table 2 Bending force of each frame (unit: kN)

[0066] using method

Embodiment 3

[0068] For stainless steel products, the specification is 6*1300mm, and the target convexity is 40μm (tolerance range ±20μm), adopt the convexity automatic control method in this paper for production. The measured strip convexity after threading is 18 μm. The set value of the bending force of each frame and the actual value after dynamic adjustment are shown in Table 3 below. The average measured value of the final strip convexity is 27 μm, reaching the target range required by the product.

[0069] Table 3 Bending force of each frame (unit: kN)

[0070] using method

[0071] According to the present invention, in the case that there is a deviation in crown setting, the crown control accuracy of the full length of the strip can be guaranteed, that is, in order to realize the automatic control of the crown of the hot-rolled strip, the uniformity of the crown of the strip can be guaranteed, and at the same time Avoid affecting rolling stability.

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Abstract

The invention discloses an automatic convexity control method for hot-rolled strip steel. The method comprises the following flows: (1) judging whether a practical deviation is within a dead zone range or not according to the online detection result of finish rolling outlet convexity, if so, not adjusting, otherwise, adjusting; (2) calculating a convexity deviation caused by each frame according to a certain convexity deviation distribution coefficient; (3) calculating the convexity adjustment amount of each frame according to a given convexity adjusting gain; (4) calculating a corresponding roll bending force adjustment amount through a roll bending force conversion coefficient; (5) judging whether the roll bending force adjustment amount surpasses a certain limit or not, if so, using the limit. According to the method, the full-length convexity control accuracy of the strip steel can be ensured under the condition of certain convexity set deviation, namely, the full-length uniformity of the strip steel is ensured in order to realize automatic convexity control of the hot-rolled strip steel. Meanwhile, the influence on the rolling stability is avoided.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel strip production, in particular, the invention relates to a method for automatically controlling the crown of a hot-rolled steel strip product. Background technique [0002] Crown is an important quality index of hot-rolled strip products. There are different requirements for the convexity of finished products for different purposes. The finished hot-rolled steel strip for direct use is expected to have a cross-sectional shape close to a rectangle, that is, the convexity is as small as possible; while the hot-rolled strip steel used as a cold-rolled raw material requires a certain convexity. [0003] Such as figure 1 As shown, the so-called convexity refers to the difference between the thickness of the center of the strip steel and the thickness of the representative point of the edge: [0004] C h =h c -h e (1) [0005] Among them, B is the strip width, C h is the strip crown,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
Inventor 张国民朱海华焦四海陈龙夫
Owner BAOSHAN IRON & STEEL CO LTD
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