阅读说明：本技术 一种改善薄规格花纹板板形的方法 (Method for improving shape of thin checkered plate ) 是由 赵志斌 李卫平 王登刚 刘勇 付开忠 田维兵 于 2019-09-30 设计创作，主要内容包括：本申请公开了一种改善薄规格花纹板板形的方法,包括以下步骤：设定最小弯辊力,采用微中浪控制模式；关闭弯辊力实时调整功能；对花纹板的温度采取分段控制。本申请所提供的方法,采用微中浪控制模式,待冷却后所述花纹板的中部的中浪和边部的双浪进行部分浪形抵消,可以有效改善花纹板的双边浪问题,并且,温度采用分段控制,可以针对所述花纹板不同位置的变形问题进行有效改善,提高带钢质量。(The application discloses a method for improving the shape of a thin checkered plate, which comprises the following steps: setting a minimum roll bending force, and adopting a micro-middle wave control mode; closing the roll bending force real-time adjusting function; and the temperature of the pattern plate is controlled in a segmented mode. The method that this application provided adopts little well unrestrained control mode, waits to cool off the back the well unrestrained of the middle part of checkered plate and the two unrestrained of limit portion carry out the wave of part and appear to offset, can effectively improve the two unrestrained problems of checkered plate to, the temperature adopts section control, can be directed against the deformation problem of checkered plate different positions effectively improves, improves belted steel quality.)

1. A method for improving the shape of a thin checkered plate is characterized by comprising the following steps:

setting a minimum roll bending force, and adopting a micro-middle wave control mode;

closing the roll bending force real-time adjusting function;

and the temperature of the pattern plate is controlled in a segmented mode.

2. The method of improving a shape of a thin gauge checkered plate of claim 1, wherein said step of "setting a minimum roll bending force" comprises:

when the thickness h of the patterned plate is less than or equal to 1.8mm, setting the minimum roll bending force to be 380-420 kN;

when the thickness of the pattern plate is more than 1.8 and less than 2.3mm, setting the minimum bending force to be 480-;

when the thickness of the patterned plate is more than or equal to 2.3 and less than 2.75 h, setting the minimum bending force to be 680-720 kN;

and when the thickness of the patterned plate is more than or equal to 2.75 and less than or equal to 3.5, setting the minimum bending force to be 780-820 kN.

3. The method for improving the shape of a thin-gauge checkered plate as claimed in claim 1, wherein said step of "stepwise controlling the temperature of the checkered plate" comprises:

controlling the head part 250m of the checkered plate according to the temperature of 580-620 ℃;

controlling the middle part of the checkered plate according to the temperature of 680-700 ℃;

and controlling the tail part 40m of the checkered plate according to the dry tail.

4. The method for improving the shape of a thin gauge checkered plate as claimed in claim 1, wherein said step of closing the roll bending force real-time adjustment function comprises:

and before the checkered plate is rolled, closing the roll bending force real-time adjusting function through a human-computer interface.

5. The method for improving the shape of a thin-gauge checkerboard as claimed in any one of claims 1 to 4, further comprising the steps of:

and in the process of rolling the checkered plate, cooling the checkered plate by adopting a lower collecting pipe cooling mode.

6. The method for improving the shape of the thin-gauge checkered plate of claim 5, wherein when the thickness of the checkered plate is H < 3.5mm, the checkered plate is cooled by adopting a lower collecting pipe cooling mode in the process of rolling the checkered plate.

Technical Field

The application relates to the field of strip steel rolling, in particular to a method for improving the shape of a thin checkered plate.

Background

As an important finished product line of a strip steel production company, a hot rolling line of a plate mill supplies a large amount of hot rolling commercial products to the market every year, however, the straight hair coil has poor plate shape quality, so that quality objections are brought forward by users, the image of the product of the whole company in the mind of the users is influenced, and economic losses are caused.

When the thin-specification checkered plate is rolled in a rolling line, the plate shape control condition is very good, but the checkered plate presents serious bilateral wave shape in the subsequent flattening process, and the problem that the bilateral wave of the thin-specification checkered plate is serious generally exists in the plate shape commonly used in the market at present, so that the use of a user is influenced.

Therefore, how to effectively reduce the double-edge wave of the checkered plate is a technical problem that needs to be solved by the technical personnel in the field at present.

Content of application

The application aims to provide a method for improving the shape of a thin checkered plate, which is used for reducing the problem of double edge waves of the checkered plate and improving the quality of strip steel.

In order to achieve the above purpose, the present application provides the following technical solutions:

a method for improving the shape of a thin-specification checkered plate comprises the following steps:

setting a minimum roll bending force, and adopting a micro-middle wave control mode;

closing the roll bending force real-time adjusting function;

and the temperature of the pattern plate is controlled in a segmented mode.

Preferably, the step of "setting a minimum bending force" includes:

when the thickness h of the patterned plate is less than or equal to 1.8mm, setting the minimum roll bending force to be 380-420 kN;

when the thickness of the pattern plate is more than 1.8 and less than 2.3mm, setting the minimum bending force to be 480-;

when the thickness of the patterned plate is more than or equal to 2.3 and less than 2.75 h, setting the minimum bending force to be 680-720 kN;

and when the thickness of the patterned plate is more than or equal to 2.75 and less than or equal to 3.5, setting the minimum bending force to be 780-820 kN.

Preferably, the step of 'controlling the temperature of the pattern plate in sections' includes:

controlling the head part 250m of the checkered plate according to the temperature of 580-620 ℃;

controlling the middle part of the checkered plate according to the temperature of 680-700 ℃;

and controlling the tail part 40m of the checkered plate according to the dry tail.

Preferably, the step of turning off the roll bending force real-time adjusting function includes:

and before the checkered plate is rolled, closing the roll bending force real-time adjusting function through a human-computer interface.

Preferably, the method further comprises the following steps:

and in the process of rolling the checkered plate, cooling the checkered plate by adopting a lower collecting pipe cooling mode.

Preferably, when the thickness of the checkered plate is H < 3.5mm, the checkered plate is cooled by adopting a lower collecting pipe cooling mode in the process of rolling the checkered plate.

The application provides a method for improving the shape of a thin-specification checkered plate, which comprises the following steps: setting a minimum roll bending force, and adopting a micro-middle wave control mode; closing the roll bending force real-time adjusting function; and the temperature of the pattern plate is controlled in a segmented mode. The method that this application provided adopts little well unrestrained control mode, waits to cool off the back the well unrestrained of the middle part of checkered plate and the two unrestrained of limit portion carry out the wave of part and appear to offset, can effectively improve the two unrestrained problems of checkered plate to, the temperature adopts section control, can be directed against the deformation problem of checkered plate different positions effectively improves, improves belted steel quality.

In a preferred embodiment, the method further comprises the steps of: and in the process of rolling the checkered plate, cooling the checkered plate by adopting a lower collecting pipe cooling mode. In the step, the lower collecting pipe cooling mode is adopted for the checkered plate, so that accumulated water on the upper surface of the annular plate is reduced, excessive cooling of the strip steel by the residual water on the surface is reduced, and the problem of double-edge waves of the checkered plate is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flowchart of one embodiment of a method for improving the shape of a thin checkered plate provided by the present application;

fig. 2 is a schematic diagram of a slight middle wave shape of a checkered plate provided by the present application;

FIG. 3 is a schematic view of a sectional controlled winding temperature of a checkered plate provided by the present application.

Detailed Description

The core of the application is to provide a method for improving the shape of a thin checkered plate, which is used for reducing the problem of double edge waves of the checkered plate and improving the quality of strip steel.

In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.

Referring to fig. 1 to 3, fig. 1 is a flowchart illustrating an embodiment of a method for improving a shape of a thin-gauge checkered plate according to the present application; fig. 2 is a schematic diagram of a slight middle wave shape of a checkered plate provided by the present application; FIG. 3 is a schematic view of the sectional controlled winding temperature of the checkered plate provided by the present application, with an interval of 10 s.

In this embodiment, the method for improving the plate shape of the thin-gauge checkered plate comprises the following steps:

step S1: setting a minimum roll bending force, and adopting a micro-middle wave control mode;

step S2: closing the roll bending force real-time adjusting function;

step S3: and the temperature of the pattern plate is controlled in a segmented mode.

The method provided by the application adopts a micro-medium wave control mode, and the medium waves at the middle part and the double waves at the edge part of the checkered plate after cooling are offset by partial wave shapes, so that the problem of double-side waves of the checkered plate can be effectively improved, and the deformation problem of different positions of the checkered plate can be effectively improved by adopting segmented control on the temperature, so that the quality of strip steel is improved.

Further, in order to ensure that the checkered plate rolling is medium wave control, firstly, the F7 roll bending force setting is optimized, the minimum roll bending force of F7 is set for different specifications according to historical statistical data, and the condition that the parameters set by the model can realize the shape of the strip steel head with slight medium waves is ensured.

Specifically, the step of setting the minimum roll bending force includes:

when the thickness h of the patterned plate is less than or equal to 1.8mm, setting the minimum bending force to be 380-420 kN;

when the thickness of the pattern plate is more than 1.8 and less than 2.3mm, setting the minimum roll bending force to be 480-;

when the thickness of the patterned plate is more than or equal to 2.3 and h is less than 2.75, setting the minimum bending force to be 680-720 kN;

when the thickness of the patterned plate is more than or equal to 2.75 and less than or equal to 3.5, the minimum bending force is set to be 780-820 kN.

Preferably, when the thickness h of the pattern plate is less than or equal to 1.8mm, the minimum roll bending force is set to be 400 kN;

when the thickness of the pattern plate is more than 1.8 and less than h and less than 2.3mm, setting the minimum roll bending force to be 500 kN;

when the thickness of the pattern plate is more than or equal to 2.3 and h is less than 2.75, setting the minimum roll bending force to be 700 kN;

when the thickness of the pattern plate is more than or equal to 2.75 and less than or equal to 3.5 h, the minimum roll bending force is set to be 800 kN.

The model is only responsible for controlling the head plate shape of the strip steel, the strip steel body carries out closed-loop control through a DPC function, namely a digital speed control function, and in order to ensure that the full-length plate shape of the strip steel with the thin specification of the checkered plate is in a micro-middle wave form, a plate shape control mode specially used for controlling the checkered plate is developed in a primary system.

On the basis of the above embodiments, the step of closing the roll bending force real-time adjustment function specifically includes: before the patterned plate is rolled, the roll bending force real-time adjusting function is closed through a human-computer interface.

According to the arrangement, before the checkered plate is rolled, the DPC function is selected to be in a closed state from the picture of the HMI human-computer interface in an operation mode, meanwhile, the primary system does not adjust the roll bending force in real time according to the actual roll bending force change any more, and the DPC function is prevented from reducing the micro-middle-wave mode of the strip steel according to the target 0-wave mode of the plate-shaped system.

On the basis of the above embodiments, the step of "performing segmented control on the temperature of the patterned plate" includes:

controlling the head part 250m of the pattern plate according to the temperature of 580-620 ℃;

controlling the middle part of the pattern plate according to the temperature of 680-700 ℃;

the tail part 40m of the pattern board is controlled according to the dry tail, specifically according to the temperature of 740 and 750 ℃.

In addition to the above embodiments, the method further includes:

and in the process of rolling the checkered plate, cooling the checkered plate by adopting a lower header cooling mode. Specifically, after the strip steel is cooled by water on the upper surface of the strip steel through the patterned beans on the laminar cooling, cooling water on the upper surface cannot be completely blown off due to the patterned beans on the upper surface, a large amount of residual water continues to cool the middle part of the strip steel, the cooling is uneven, the middle part of the strip steel is cooled more quickly than the edge part, and the strip steel is subjected to double-edge wave after being uncoiled.

According to the steps, the accumulated water on the upper surface of the ring grain plate is reduced by adopting a lower collecting pipe cooling mode for the pattern plate, so that the excessive cooling of the strip steel by the residual water on the surface is reduced, and the problem of double-edge waves of the pattern plate is further reduced.

In addition to the above embodiments, when the thickness of the pattern plate is H < 3.5mm, the pattern plate is cooled by a lower header cooling method during the rolling process of the pattern plate, and the pattern plate with the thickness of 3.5mm or less is cooled by a lower header cooling method, that is, the pattern part is cooled at the lower part of the pattern plate.

According to the method provided by the embodiment, after the hot rolling line of a plate factory adopts the technology, the qualification rate of the rolled thin checkered plate shape is increased from about 95% to about 99.1% at present, and the qualification rate is obviously improved.

The method for improving the shape of the thin-specification checkered plate provided by the application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.