CN113714305B

CN113714305B - Method for improving flat plate shape defect

Info

Publication number: CN113714305B
Application number: CN202110869139.XA
Authority: CN
Inventors: 杨立庆; 饶静; 邓杭州; 商存亮; 牛庆林; 杨冰; 徐军来
Original assignee: Anyang Iron and Steel Co Ltd
Current assignee: Anyang Iron and Steel Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-06-30
Anticipated expiration: 2041-07-30
Also published as: CN113714305A

Abstract

The invention discloses a method for improving flat plate shape defects, which relates to the technical field of steel plate production, and specifically comprises the steps of processing the roller body profile of a support roller into a smooth curve of a sixth-order function, wherein the curve equation of the sixth-order function is as follows: y (x) =a ₁ x ¹ +a ₂ x ² +a ₃ x ³ +a ₄ x ⁴ +a ₅ x ⁵ +a ₆ x ⁶ Wherein x represents the length of the roll body, y represents the height of the contour shape of the edge of the roll body, and a ₁ 、a ₂ 、a ₃ 、a ₄ 、a ₅ 、a ₆ Representing the equation coefficients, are: 3.578222 ×10 (-03), -1.131552 ×10 (-05), 1.918310 ×10 (-08), -1.781695 ×10 (-11), 8.512858 ×10 (-15), and-1.640242 ×10 (-18).

Description

Method for improving flat plate shape defect

Technical Field

The invention relates to the technical field of steel plate production, in particular to a method for improving flat plate defects.

Background

In a hot continuous rolling line, a temper mill is an important plate shape processing apparatus for cold working deformation of a cooled hot rolled coil to correct a plate shape. The leveling machine roller system generally comprises a working roller and a supporting roller, wherein a roller gap formed between the upper working roller and the lower working roller is in direct contact with strip steel for rolling, the supporting roller is attached to the working roller, and the excessive deflection deformation of the working roller is reduced while the pressing moment is transmitted to the working roller, so that the rigidity of the roller system is improved.

The initial shape of the working roll and the supporting roll and the shape deformed under the rolling pressure determine the shape of the rolled strip steel, and the premise of ensuring the good shape is that the strip steel extends uniformly along all parts of the cross section. In order to make the flat plate shape good, it is necessary to ensure that the bearing roll gap formed by the upper and lower working rolls is consistent with the original sectional shape of the rolled piece. Due to the action of rolling pressure, the roller system can flex and deform, a cantilever beam structure can be formed at the roller part outside the strip steel contact area, so that the roller at the end part of the working roller is excessively bent, the roller gap at the edge part of the working roller is reduced relative to the middle part, and the edge part of the rolled piece extends more than the middle part to generate edge waves. In order to eliminate the edge wave, the bending roller device which is usually used at two ends of the working roller is used for carrying out strong reverse bending on the working roller and is used for counteracting the deflection deformation of the roller, thereby improving the edge wave trend of the strip steel. However, the action point of the working roll bending device is at the end part of the working roll, and due to the supporting effect of the supporting roll on the working roll, the back bending of the working roll cannot effectively act on the area inside the end part of the working roll, and the situation that the back bending is too much extended relative to the adjacent part of the back bending device occurs in the area near the edge part of the strip steel, so that the plate defect is caused, which is called as near-edge wave. Due to the lack of effective control means, the defect of the 'near-edge wave' plate shape restricts the bottleneck problem of the quality of the flat plate shape, and simultaneously reduces the efficiency of the flat operation.

In order to eliminate the defect of the shape of the near-edge waves, in the prior art, japanese Mitsubishi corporation developed a UCG rolling mill, the UCG rolling mill is added with a middle roller on the basis of the existing four-roller temper mill, and the bending roller of the middle roller is added, so that the purposes of improving the rigidity of the roll system of the temper mill and reducing the excessive deflection of a working roller are achieved through the movement and the bending roller of the middle roller. The germany cimak company developed a 6-roll CVC mill, the middle roll had a certain curve shape, the purpose of changing the roll gap shape was achieved by drawing the middle roll, and finally the purpose of improving near-edge wave defects was achieved. However, the two technologies have complex structures and high maintenance cost, and the modification cost is high for the existing four-high mill.

Disclosure of Invention

The invention aims to provide a method for improving the shape defect of near-edge waves. The method can reduce the extension of the near edge of the strip steel and improve the shape defect of near edge waves.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a method for improving the defect of flat plate shape is to process the contour of the back-up roll of a leveling machine into a smooth sixth-order function curve, and the equation of the sixth-order function curve is as follows:

y(x)=a ₁ x ¹ +a ₂ x ² +a ₃ x ³ +a ₄ x ⁴ +a ₅ x ⁵ +a ₆ x ⁶ wherein x represents the length of the roll body, y represents the height of the contour shape of the edge of the roll body, and a ₁ 、a ₂ 、a ₃ 、a ₄ 、a ₅ 、a ₆ Representing the equation coefficients, are: 3.578222 ×10 (-03), -1.131552 ×10 (-05), 1.918310 ×10 (-08), -1.781695 ×10 (-11), 8.512858 ×10 (-15), and-1.640242 ×10 (-18).

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the contour of the supporting roller body of the leveling machine is processed into a smooth transition multiple square curve, so that the control of the relative extension of the strip steel in the near-edge region of the supporting roller can be realized, and the near-edge wave shape defect is improved.

2. According to the invention, the profile curve of the supporting roller body of the leveling machine is designed into a form of a plurality of square curves, so that the grinding of the supporting roller can be continuously formed, and the finish and the roller shape precision of the whole roller body profile grinding are ensured.

3. The invention is applied to a leveling machine with the thickness of 1780mm for safety steel, so that the problem of 'near side waves' of a leveling plate shape is solved well, the problem of the leveling plate shape is reduced by 13%, the production capacity of the leveling machine is released, and the production capacity of the leveling machine is improved by 10%.

Drawings

FIG. 1 is a schematic view of the construction of a temper mill backup roll;

FIG. 2 is a profile of a temper mill backup roll body of the present invention;

in the figure: 1. roll body, 2, roll neck, 3, roller head.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Fig. 1 shows a schematic structural diagram of a leveling machine support roller, which comprises a support roller body, wherein the support roller body comprises a roller body 1, a roller neck 2 and a roller head 3, and the roller body 1, the roller neck 2 and the roller head 3 are integrally formed into the support roller body.

To improve the "near-edge wave" plate shape defect, the profile of the supporting roller body 1 is processed into a Fang Hanshu curve of six times in this embodiment, as shown in fig. 2, and the function curve equation is as follows: y=a ₁ x ¹ +a ₂ x ² +a ₃ x ³ +a ₄ x ⁴ +a ₅ x ⁵ +a ₆ x ⁶ Wherein: x represents the length of the roll body, y represents the height of the contour shape of the edge of the roll body, a ₁ 、a ₂ 、a ₃ 、a ₄ 、a ₅ 、a ₆ Representing the equation coefficients, are: 3.578222 ×10 (-03), -1.131552 ×10 (-05), 1.918310 ×10 (-08), -1.781695 ×10 (-11), 8.512858 ×10 (-15), and-1.640242 ×10 (-18).

When the support roller is manufactured, the support roller with the outline shape is obtained by inputting each coefficient of a hexagonal equation on a grinding machine for grinding. The specific operation is as follows: selecting a polynomial roll shape on a grinding machine, inputting a start coordinate and a coordinate end, inputting each coefficient of a hexagonal equation, and grinding to obtain the support roller.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A method for improving the flat plate shape defect is characterized in that the method is to control the relative extension of strip steel in the near edge area of a supporting roller, and improve the near edge wave shape defect, specifically, the contour shape of the supporting roller of a leveling machine is processed into a smooth curve of a sixth order function, so that the supporting roller is ground continuously, and the curve equation of the sixth order function is as follows: y (x) =a ₁ x ¹ +a ₂ x ² +a ₃ x ³ +a ₄ x ⁴ +a ₅ x ⁵ +a ₆ x ⁶ Wherein x represents the length of the roll body, y represents the height of the contour shape of the edge of the roll body, and a ₁ 、a ₂ 、a ₃ 、a ₄ 、a ₅ 、a ₆ Representing the equation coefficients, are: 3.578222 ×10 (-03), -1.131552 ×10 (-05), 1.918310 ×10 (-08), -1.781695 ×10 (-11), 8.512858 ×10 (-15), and-1.640242 ×10 (-18).